Submitted by (edna.saturno@ufrpe.br) on 2017-02-20T13:11:23Z No. of bitstreams: 1 Robson Tavares Barbosa.pdf: 4522145 bytes, checksum: 55ba3289221c88cade2ebcf2ee0896bc (MD5) / Made available in DSpace on 2017-02-20T13:11:23Z (GMT). No. of bitstreams: 1 Robson Tavares Barbosa.pdf: 4522145 bytes, checksum: 55ba3289221c88cade2ebcf2ee0896bc (MD5) Previous issue date: 2012-02-28 / This study evaluated the profiles of seasonal diets of Eugerres brasilianus and Diapterus rhombeus, and food overlap between these species caught in the channel of Santa Cruz, located on the northern coast of the Pernambuco state, from June 2010 to May 2011. The goal was to provide input as a basis for studies aimed at the sustainable use and cultivation of these species. To understand their eating habits, we analyzed 837 individuals of both species, 567 species of E. brasilianus and 270 species of D. rhombeus, which, through its degree of fullness, frequency of occurrence, frequency number and index of food importance, we could verify their diets. As for the evaluation of overlapping niches, we used the Morisita-Horn index and multivariate analysis (Euclidean Distance). The two species have a very diverse food spectrum with high niche overlap (0.97). The most consumed item by both was Polychaeta, item with more than 75% of important food for both species. Bivalvia and Decapoda, were the most consumed by E. brasilianus item after the Polychaeta, with peak consumption during the year. While, for D. rhombeus, the most consumed items after the item Polychaeta were Amphipoda and Stomatopoda. The two species, as well as most individuals Gerreidae family, can be considered generalists because they present a wide food spectrum, opportunistic taking advantage of food in abundance in the environment, and omnivores with a preference for benthic invertebrates, especially polychaetes. / Neste trabalho foram avaliados os perfis sazonais das dietas de Eugerres brasilianus e Diapterus rhombeus, e, a sobreposição alimentar entre estas espécies capturadas no canal de Santa Cruz, localizado no litoral norte do estado de Pernambuco, no período de junho de 2010 a maio de 2011. Teve como objetivo fornecer subsídios que sirvam de base para estudos voltados para o cultivo e uso sustentável destas espécies. Para entender seus hábitos alimentares, foram analisados 837 indivíduos das duas espécies, 567 da espécie E. brasilianus e 270 da espécies D. rhombeus, dos quais, através do seu grau de repleção, freqüência de ocorrência, freqüência numérica e índice de importância alimentar, pôde-se verificar suas dietas. Já para a avaliação da sobreposição de nichos, utilizou-se o índice de Morisita-Horn e análise multivariada (Distância Euclidiana). As duas espécies apresentaram um espectro alimentar bastante variado com alta sobreposição de nichos (0,97). O item mais consumido por ambas foi o item Polychaeta, com mais de 75% de importância alimentar para ambas as espécies. Decapoda e Bivalvia, foram os itens mais consumidos por E. brasilianus depois do item Polychaeta, apresentando picos de consumo durante o ano. Enquanto que, para D. rhombeus, os itens mais consumidos após o item Polychaeta, foram Amphipoda e Stomatopoda. As duas espécies, assim como a maioria dos indivíduos da família Gerreidae, podem ser consideradas generalistas, por apresentarem um variado espectro alimentar, oportunistas por se aproveitarem do alimento em abundância no ambiente, e, onívoras com preferência para invertebrados bentônicos, especialmente para poliquetas.

Diss. (sammanfattning) Linköping : Linköpings universitet, 2005. / Härtill 5 uppsatser.

Diss. (sammanfattning) Umeå : Sveriges lantbruksuniv., 2003. / Härtill 5 uppsatser.

Ce travail s’attache à étudier les conséquences qu’ont eu les contacts entre Britanniques et populations amérindiennes sur le mode de vie de ces deux populations dès leur première rencontre. L’idée reçue veut que seuls les Britanniques aient laissé (et lourdement) leur empreinte sur le sol et les peuples qu’ils ont rencontrés à leur arrivée sur le nouveau continent. Or le sujet est ici plutôt celui d’une influence réciproque dans une certaine mesure, au vu de données archéologiques, historiques et ethnohistoriques. Les angles d’étude choisis sont les habitudes et comportements liés directement ou non à l’alimentation (comment se procuraient-ils leur nourriture, comment la cuisinaient-ils, la partageaient-ils, quels liens sociaux découlaient de ces procédés,… ?), les différences culturelles et les rapports aux autres (autres tribus, colons originaires d’autres nations européennes…) qu’ils soient amicaux ou hostiles, diplomatiques ou économiques. / This study investigates the consequences that contacts between British people and Native American populations had on their respective ways of life. There is a widespread cliché in people’s minds according to which only British people would have had (heavily) left their marks on the North American ground and peoples that they encountered. Nevertheless, and contrarily to this idea, we shall tackle here their reciprocal influence, that is the way in which Native tribes also deeply impacted British colonists’ everyday life in the New World. We were able to witness such an influence thanks to archaeological, historical and ethnohistorical evidence. Various angles of study were chosen for this paper: the cultural habits and behaviors directly or indirectly linked to food (how did people have access to food supplies? How were foodstuffs prepared or cooked? Were food and/or meals shared? Which social links and practices -if any- derived from such habits?...). We shall also have to present to the audience what Native people’s connections and attitudes towards other tribes, or colonists from different European nations, were. And these could have been friendly, diplomatic, economical or even hostile relationships, implying political management and thinking ahead of taking actions, which was commonly omitted in the past.

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / The aim of this work was analyze population structure, reproductive biology and feeding ecology of Loricariichthys melanocheilus in Ibicui River. Fish were caught bimonthly in lotic and lentic environment between São Vicente do Sul and Itaqui, with gillnets and witches, with revision every six hours. The population structure was evaluated by seasonal and spatial distribution, bimonthly variations in average size, sex ratio and weight-length relationship. Females reached larger sizes than males and the sex ratio was 1.38 females per male, with some variations bimonthly. This species showed positive allometric growth, with greater increase in weight than in length during ontogenetic development. The condition factor was higher in males and in June/July. Females didn t show variations in this parameter. The values of gonad condition factor, GSI and the frequency of mature individuals indicate that the reproductive period begins in August/September, peaking in October / November and spawning in the following months. Regarding the feeding ecology, L. melanocheilus showed a detritivorous feeding habit, even consuming sediment, organic vegetable matter, nematodes, insects of the order Diptera, Trichoptera, Ephemeroptera and Odonata, algae, microcrustaceans, fungi, protozoa and other invertebrates. The diet showed little seasonal, environmental and by length classes variation. The species showed no intense feeding activity, being higher before or after the reproductive period and in lentic environment. The intestinal quotient of 1.51 was smaller than registered for other species of the family, showing variations according to the length classes in response to variations in the diet. / O objetivo do presente trabalho foi avaliar aspectos da estrutura populacional, biologia reprodutiva e ecologia alimentar de Loricariichthys melanocheilus no rio Ibicuí. Os peixes foram coletados bimestralmente em ambientes lênticos e lóticos no rio Ibicuí, entre os municípios de São Vicente do Sul e Itaqui, utilizando redes de espera e feiticeiras, com revisão a cada seis horas no período de 24 horas. A estrutura populacional foi avaliada através da distribuição sazonal e espacial, das variações bimestrais nos tamanhos médios, proporção sexual total, bimestral e por classes de comprimento e relação peso/comprimento. As fêmeas atingiram tamanhos maiores que os machos e a proporção sexual encontrada foi de 1,38 fêmeas para cada macho, com algumas variações bimestrais. A espécie apresentou crescimento alométrico positivo, com maior incremento em peso do que em comprimento durante o desenvolvimento ontogênico. Os machos apresentaram maior fator de condição que as fêmeas, sendo mais elevado em junho/julho. Já as fêmeas não apresentaram variações neste índice durante o período de estudo. Os valores do fator de condição gonadal, índice gonadossomático e a frequência de indivíduos maduros indicam que o período reprodutivo da espécie se inicia em agosto/setembro, com pico em outubro/novembro e desova nos meses seguintes. Em relação à ecologia alimentar, L. melanocheilus apresentou hábito alimentar detritívoro, consumindo ainda sedimento, matéria orgânica vegetal, Nematoda, insetos das ordens Diptera, Trichoptera, Ephemeroptera e Odonata, algas, microcrustáceos, fungos, protozoários e outros invertebrados. A dieta apresentou poucas variações sazonais, ambientais e por classes de comprimento. A espécie não apresentou atividade alimentar intensa, sendo esta mais elevada em períodos anteriores ou posteriores ao período reprodutivo e em ambientes lênticos. O quociente intestinal de 1,51 foi menor do que registrado para outras espécies da família e apresentou variações sazonais e de acordo com as classes de comprimento, em resposta às variações na dieta.

Made available in DSpace on 2014-06-11T19:30:14Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-03-12Bitstream added on 2014-06-13T20:39:57Z : No. of bitstreams: 1 gussoni_coa_me_rcla.pdf: 665002 bytes, checksum: 041131facf35002a9f8926d9867069d7 (MD5) / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) / A maria-da-restinga (Phylloscartes kronei) é uma espécie da família Tyrannidae descrita recentemente e considerada como globalmente ameaçada de extinção, cuja história natural é pouco conhecida. Visando preencher parte desta lacuna, o objetivo deste estudo foi de caracterizar o comportamento de forrageamento da maria-da-restinga, descrever os bandos mistos aos quais ela se associa, bem como descrever alguns outros aspectos de sua história natural como seus hábitos alimentares, o comportamento de dormir, insights sobre a biologia reprodutiva, o alcance de vôo, encontros agonísticos interespecíficos e a muda. No período de agosto de 2008 a julho de 2009 foram realizadas excursões mensais ao município de Ilha Comprida (~24º S), Estado de São Paulo. Aliado ao esforço anual mencionado, uma visita ao município de Guaraqueçaba (25º18'S e 48º19'W), Estado do Paraná, foi conduzida entre os dias 25 de julho e 1º de agosto de 2008. Foram coletadas 613 amostras de forrageamento, através de observações diretas com auxílio de binóculos com aumento de 10 vezes. Durante os períodos de coleta de dados sobre o forrageamento da espécie, para cada encontro com a mesma foi anotado se esta se encontrava só, aos pares, em grupos ou associada a bandos mistos de aves. Quando em bandos mistos, foram anotadas todas as espécies ocorrentes, visando caracterizar os bandos aos quais se associa. Para a descrição do hábito alimentar da espécie foram analisados os conteúdos estomacais de cinco exemplares coletados na década de 1990 no Estado do Paraná, tendo sido identificados 116 ítens alimentares. Através da análise dos dados obtidos, conclui-se que P. kronei captura suas presas principalmente em folhas verdes, entre 0,5 e 15m acima do solo, utilizando a manobra “investir-atingir”. Alimenta-se predominantemente de artrópodes, sendo que os insetos das ordens Coleoptera... / The Restinga Tyrannulet (Phylloscartes kronei) is a recently described and globally threatened species of the family Tyrannidae, whose natural history is poorly known. In this study several information on the natural history of P. kronei were gathered such as several aspects on foraging behavior, association with mixed species bird flocks, feeding habits, the description of the roosting behavior, insights on the reproductive biology, the flying range, interespecific agonistic encounters and moulting. From August 2008 to July 2009, data on this species were collected on a monthly basis in Ilha Comprida (~24º S), São Paulo state, Brazil. In addition, a visit to Guaraqueçaba (25º18'S e 48º19'W), Paraná state, was conducted between 25 July and 01 August 2008. A total of 613 foraging maneuvers were gathered by direct observations with the aid of binoculars with 10x magnification. In all meetings with the species it was reported if individuals were alone, in pairs, in groups or associated with mixed species bird flocks. When mixed species flocks with Restinga Tyrannulets were observed, all species in the flock were identified. Five stomach contents collected in the 1990s in Paraná state were evaluated and 116 food items were identified. The Restinga Tyrannulet captures preys mainly with sally-strikes in green leaves between 0.5 and 15m above the ground. This species feeds mainly on arthropods, especially Coleoptera and Hymenoptera. The observed foraging behaviors and feeding habits were similar to the ones observed in other species of Phylloscartes, but new food items are described for this genus: Anobiidae (Coleoptera), Coccinelidae (Coleoptera), Chalcidoidea (Hymenoptera), Microhymenoptera and two species of fruits (Clusia criuva and Ternstroemia brasiliensis). P. kronei is a sporadic follower of mixed species bird flocks, which had the inclusion of 25 species on their compositions... (Complete abstract click electronic access below)

Alongside the destruction of habitat, the impact of invasive alien species (IAS) is considered as one of the most important threats to global biodiversity. Therefore, international directives as well as national legislation call for measures to prevent the further spread of already established IAS as well as to limit their negative effects on native flora and fauna. This study deals with one of these non-native species – the American mink (Neovison vison). In order to get information about ecology and behaviour of this semiaquatic carnivore, a small population in a north German fishpond area, where mink has been spreading since the 1970s, was investigated. During the years 2003 to 2006 data about annual and circadian activity patterns, space use, territorial system as well as feeding habits and their variations during different seasons were collected. For this purpose, altogether 14 individuals (nine males, five females) were monitored using radio-telemetry. Based on the results, the potential impact of American mink on indigenous species was discussed and implications for mink control and management were deduced. American mink are difficult to radio tag. The small difference between their head and neck circumferences mean that the radio collars must be worn tightly to prevent loss. A methodological evaluation of conventional collar transmitters revealed that in six out of eight cases serious skin injuries on the necks were the consequences. Therefore, all radio collars were removed and radio transmitters were surgically implanted in the peritoneal cavity of mink by veterinarians. One male bit open the sutures and died after emergency surgery, but in 13 cases implantation did not affect survival or reproduction of the mink. With reference to animal welfare, intraperitoneal implantation of radio transmitters (in combination with observation and quarantine for several days after operation) instead of external radio collars were recommended for long term telemetry studies of American mink. Analyses of annual activity patterns revealed significant differences in seasonal activity rates. Both sexes reduced their average activity rates in cold winter months (October to February) to about 23 %. This energy-saving strategy is possible because of sufficient food availability, especially of fish, at this time. In March, male as well as female mink considerably increased their activity to almost 40 % due to the mating season. In summer months, during the pup-raising period (May to August), female activity continued to be high (between 40 and 50 %). However, male mink which are not involved in rearing the young, were less active (about 30 %) until July. But in August and September, the time of juvenile dispersal followed by changes in the territorial system and intraspecific aggression, activity rates of males increased again up to 43 %. Circadian activity rhythms differed markedly between sexes. All investigated females exhibited a perennial diurnal pattern. Three of five investigated male mink showed typical nocturnal activity throughout the year. Two males displayed arrhythmic behaviour; they did not prefer any time of the day for activity. On the one hand, gender differences in annual as well as circadian activity patterns of American mink reflect the diversity in ecological constraints, primarily the investment into reproduction. On the other hand, the different temporal strategies of sexes may have the potential to reduce intraspecific, especially intersexual competition. Investigating territorial systems and space use of mink, in comparison to other European studies, relatively large home ranges combined with a quite low population density were observed. In summer months male mink used on average 15.4 km length of waterway and female mink used on average 9.3 km length of waterway. In accordance with the trend of activity rates, male and female mink reduced their large summer home ranges by more than half during the cold winter period. But all-season male mink used significantly larger areas than female mink. High intersexual overlapping rates of home ranges and low levels of intrasexual overlapping of neighbouring home ranges confirm intrasexual territoriality of American mink. Probably, the low population density (0.6-0.7 individuals/km2) allows such high variations in seasonal and sexual home range size. During the mating season males considerably enlarged their home ranges and roamed nearly through the entire study area in search of receptive females. The shifting of stable temporary home ranges observed within one season or between the same seasons of consecutive years demonstrates the highly dynamic nature of spatial behaviour among American mink. The recorded characteristic features of spatial and temporal behaviour should be considered when planning monitoring- and management measures of this invasive carnivore. For instance, the reduced home ranges and activity rates during winter months should be taken into account in mink trapping projects. Analyses of more than 2500 scatsamples of radio tracked mink show that investigated animals principally prey on fish, small mammals and birds (eggs inclusive). There were significant seasonal variations of diet composition. In spring, the three categories of prey - fish, mammals and birds (eggs inclusive) - were hunted in similar amounts. During summer, birds and their eggs made up the main part of the diet followed by mammals. In autumn, the proportion of birds in the mink diet decreased, whereas fish gained in importance. This trend continued during the winter period, when mink preyed almost exclusively on fish. Throughout the entire year amphibians, crustaceans, insects, molluscs and reptiles were found only occasionally in scatsamples. Among birds, the mink preyed mainly on the Eurasian Coot (Fulica atra) followed by the Mallard (Anas platyrhynchos). Mammalian prey was clearly dominated by the water vole (Arvicola terrestris) and among fish, mink hunted especially perch (Perca fluviatilis), roach (Rutilus rutilus) and carp (Cyprinus carpio). Results clearly demonstrate that mink is an opportunistic predator, which hunts its prey according to availability and vulnerability, respectively. Despite the high portions of fish in the autumn and winter diet, the economic damage to fishery caused by mink seems to be low. Perch and roach were preyed on in higher frequencies than the carp which is economically relevant. However, high predation on birds and their eggs during the breeding season indicates a potential negative impact of mink on waterfowl. To summarise, it can be noted that characteristic features of the anthropogenically influenced study area affect feeding habits, activity patterns, space use and density of local mink population. In this regard the management of fishponds, which influences seasonal availability of habitat- and food resources for mink, plays an important role. American mink is regarded as “invasive”, because a negative impact on native species has been proved by several European studies. Consequently, this study recommends management with a focus on effective monitoring and, if necessary, control or exclusion measures adapted to the specific local requirements. Furthermore, to prevent additional introductions into the wild, the still existing farms have to be protected against outbreaks and liberations. In the long term, a general ban on the trade and keeping of American mink would be desirable. / Der Einfluss invasiver, gebietsfremder Arten wird neben der Habitatzerstörung als eine der größten Gefährdungen der Biodiversität weltweit angesehen. Sowohl internationale Umweltvereinbarungen als auch die nationale Gesetzgebung fordern daher Maßnahmen, die eine weitere Ausbreitung bereits etablierter invasiver Neozoen verhindern und deren negative Einflüsse minimieren. Die vorliegende Studie befasst sich mit einer dieser Neozoen - dem Amerikanischen Nerz bzw. Mink (Neovison vison). Um Erkenntnisse zu Ökologie und Verhalten des semiaquatischen Musteliden in Deutschland zu gewinnen, wurden Daten zu tages- und jahreszeitlichen Aktivitätsmustern, zu Raumnutzung und Territorialsystem sowie zur Nahrungswahl und den jahreszeitlichen Unterschieden im Beutespektrum der Art erhoben. Dafür konnten in den Jahren 2003 bis 2006 in einem Fischteich-Gebiet in Mecklenburg-Vorpommern, wo sich Minke bereits seit den 1970er Jahren etabliert haben, insgesamt 14 Individuen (neun Männchen, fünf Weibchen) radiotelemetrisch überwacht werden. Anhand der Ergebnisse wird einerseits der potentielle Einfluss des gebietsfremden Raubsäugers auf einheimische Arten abgeschätzt und diskutiert. Andererseits werden die Ergebnisse herangezogen, um effektive Monitoring- und Managementmaßnahmen abzuleiten. Eine methodische Evaluation von Halsbandsendern zeigte, dass in sechs von acht Fällen die getesteten Halsbänder, die aufgrund des sehr ähnlichen Hals-Kopf-Umfanges der Individuen relativ eng angelegt werden müssen, Hautverletzungen verursachten. Infolgedessen wurden die Halsbandsender gegen durch Tierärzte operativ in die Bauchhöhle eingesetzte Implantationssender ausgetauscht. Auch bei allen nachfolgend gefangenen Tieren wurden die Sender implantiert. Bei insgesamt 14 durchgeführten Erstimplantationen beeinflussten mit Ausnahme eines Falles (Tod durch Aufbeißen der Naht) die Implantate weder das Überleben, noch die Reproduktion der Minke. Daher ist v.a. in Hinblick auf Tierschutzaspekte die Senderimplantation (in Kombination mit einer Mehrtages-Quarantäne) anstatt der Verwendung von externen Halsbandsendern zu empfehlen. Die Analyse der circannuellen Aktivitätsmuster ergab signifikante Unterschiede der saisonalen Aktivitätsraten. Während der kalten Wintermonate (Oktober bis Februar) zeigten beide Geschlechter mit durchschnittlich etwa 23 % eine vergleichsweise geringe Aktivität. Diese energiesparende Verhaltensweise war möglich, da auch im Winter ein ausreichend hohes Nahrungsangebot, vor allem an Fisch, vorhanden war. Im März kam es sowohl bei den Männchen als auch bei den Weibchen zu einem durch die Paarungszeit verursachten, beträchtlichen Anstieg der mittleren Aktivitätsraten auf fast 40 %. In den Sommermonaten (Mai bis August) waren die weiblichen Tiere, durch die Anforderungen der Jungenaufzucht bedingt, anhaltend häufig aktiv (zwischen 40 und 50 %). Die Aktivitätsraten der nicht an der Jungenaufzucht beteiligten Männchen dagegen nahmen im April wieder ab, um bis zum Juli auf einem vergleichsweise geringen Niveau von etwa 30 % zu bleiben. Sie stiegen jedoch während der Monate August und September erneut auf etwa 43 % an. Zu dieser Zeit wandern gewöhnlich die Jungtiere ab und suchen sich ein eigenes Streifgebiet (= Aktionsraum), dadurch kommt es zu Änderungen im Territorialsystem und damit einhergehenden innerartlichen Auseinandersetzungen. Beide Geschlechter unterscheiden sich stark in ihren tageszeitlichen Aktivitätsrhythmen. Alle Weibchen waren ganzjährig tagaktiv. Von den fünf untersuchten Männchen zeigten drei typische Nachtaktivität im gesamten Jahresverlauf. Die beiden anderen männlichen Tiere verhielten sich in ihren Aktivitätsrhythmen indifferent, sie zeigten das ganze Jahr über keine Präferenzen für eine bestimmte Tageszeit. Die geschlechtsspezifischen Unterschiede sowohl in den circannuellen als auch in den circadianen Aktivitätsmustern spiegeln zum einen die verschiedenen Anforderungen an die Geschlechter wieder, vor allem die Investitionen in die Fortpflanzung. Zum anderen können die geschlechtsspezifisch unterschiedlichen Zeitnutzungs-Strategien zu einer Minimierung der innerartlichen, vorzugsweise der intersexuellen Konkurrenz führen. Die Analyse der Telemetriedaten hinsichtlich Raumnutzung und Territorialsystem ergab im Vergleich zu anderen europäischen Studien relativ große individuelle Aktionsräume verbunden mit einer geringen Populationsdichte im Untersuchungsgebiet. So erstreckten sich die durchschnittlich genutzten Sommerstreifgebiete der Männchen auf 15,4 km und die der Weibchen auf 9,3 km Flusslauf bzw. Teichufer. Entsprechend dem Trend der saisonalen Aktivitätsmuster, reduzierten beide Geschlechter ihre großen Sommerstreifgebiete während der Winterhalbjahre um mehr als die Hälfte der Fläche. Allerdings nutzten die Männchen zu allen Jahreszeiten wesentlich größere Aktionsräume als die weiblichen Minke. Große Streifgebietsüberlappungen zwischen den Geschlechtern sowie verhältnismäßig niedrige Überlappungsraten der benachbarten Streifgebiete von Tieren des gleichen Geschlechts bestätigen die intrasexuelle Territorialität der Art. Die erheblichen Unterschiede der saisonalen und geschlechtsspezifischen Aktionsraumgrößen werden vermutlich durch die ermittelte, vergleichsweise geringe Populationsdichte (0,6-0,7 Individuen/km2) ermöglicht. Die ausgedehnte und sich fast über das gesamte Untersuchungsgebiet erstreckende Raumnutzung der Männchen während der Paarungszeit ist durch die Suche nach fortpflanzungsbereiten Weibchen bedingt. Die Raumnutzung der untersuchten Minke unterliegt einer hohen Dynamik, dies wird durch die häufige räumliche Verschiebung temporär stabiler Streifgebiete innerhalb einer Jahreszeit oder auch zwischen den gleichen Jahreszeiten aufeinanderfolgender Jahre verdeutlicht. All diese ermittelten charakteristischen Besonderheiten im Raum-Zeit-Verhalten der Art sollten bei der Entwicklung von Monitoring- und Managementkonzepten berücksichtigt werden. So müssen beispielsweise bei der Fallenjagd im Winter die zu dieser Zeit stark verkleinerten Streifgebiete und die reduzierten Aktivitätsraten Beachtung finden. Die Analyse der über 2500 Losungsproben telemetrierter Minke zeigte, dass sich die untersuchten Tiere hauptsächlich von Fisch, Kleinsäugern und Vögeln (inklusive deren Eiern) ernährten. Dabei traten allerdings signifikante saisonale Unterschiede in der Nahrungs-zusammensetzung auf. So wurden im Frühjahr die drei Beutekategorien Fisch, Kleinsäuger sowie Vögel und deren Eier in ähnlichen Anteilen erbeutet. Während des Sommers bildeten Vögel und Vogeleier die Hauptbeute, gefolgt von Kleinsäugern. Im Herbst verringerte sich der Vogel- und Kleinsäugeranteil im Beutespektrum zugunsten von Fisch. Dieser Trend setzte sich bis in den Winter fort; in dieser Jahreszeit ernährten sich die Minke fast ausschließlich von Fisch. Amphibien, Reptilien, Krebstiere, Insekten und Mollusken wurden im gesamten Jahresverlauf nur gelegentlich gefressen. Innerhalb der Gruppe der Vögel prädierten die Minke vor allem Blässhühner (Fulica atra), gefolgt von Stockenten (Anas platyrhynchos). Das Kleinsäuger-Beutespektrum wurde eindeutig von der Schermaus (Arvicola terrestris) dominiert und unter den Fischen erbeuteten die Minke vorzugsweise Flussbarsche (Perca fluviatilis), Plötzen (Rutilus rutilus) und Karpfen (Cyprinus carpio). Die Ergebnisse der Nahrungsanalyse bestätigen den Mink als einen opportunistischen Prädator, der seine Beutetiere je nach Verfügbarkeit bzw. dem erforderlichen Jagdaufwand nutzt. Trotz des hohen Fischanteils in der Herbst- und Winternahrung ist der durch den Mink verursachte ökonomische Schaden schätzungsweise relativ gering. Flussbarsch und Plötze wurden in höheren Frequenzanteilen erbeutet als der wirtschaftlich relevante Karpfen. Die starke Prädation von Wasservögeln und deren Eiern besonders in den Frühjahrs- und Sommermonaten weist allerdings auf einen potentiell negativen Einfluss des invasiven Raubsäugers auf diese Tiergruppe hin. Zusammenfassend lässt sich festhalten, dass die spezifischen Charakteristika des anthropogen geprägten Untersuchungsgebietes sowohl Nahrungsökologie und Aktivitätsmuster als auch Raumnutzung und Populationsdichte der lokalen Minkpopulation beeinflussen. Eine besondere Rolle hierbei spielt die Bewirtschaftung der Fischteiche, denn vor allem daraus resultiert für die Minke eine saisonal unterschiedliche Verfügbarkeit an Lebensraum und Nahrung. Negative Auswirkungen des Amerikanischen Nerzes auf die einheimische Tierwelt wurden in anderen europäischen Ländern belegt und rechtfertigen die Einstufung dieser Art als „invasiv“. Demzufolge wird in der vorliegenden Arbeit ein Management empfohlen, bei dem der Focus auf einem effektiven Monitoring und gegebenenfalls auf zweckmäßigen, an die lokalen Bedingungen angepassten Fang- oder Abwehrmaßnahmen liegt. Zudem sollten, um einer weiteren Ausbringung in das Freiland vorzubeugen, die wenigen noch existierenden Minkfarmen besser gegen Ausbrüche bzw. Freilassungsaktionen gesichert werden. Langfristig ist ein generelles Besitz- und Vermarktungsverbot für die Art wünschenswert.

Según un informe de Adex acerca de tendencia y hábitos del consumidor en el año 2020, publicado en mayo del mismo año señala que los consumidores han revaluado sus prioridades de vida, hábitos y comportamiento en esta nueva normalidad, entre los cambios mencionan un mayor cuidado en su bienestar, no realizar actividades como viajar y comer fuera ya que existe un miedo a contraer el virus del COVID, informa además que estos hábitos se quedaran establecidos post COVID; por otro lado el mismo informe señala según datos de la consultora Nielsen que existe un incremento de consumo de frescos de 10 y 15% por encima de la alimentación preparada, la cual se incrementó en 8%, se señala también la vuelta a la cocina casera. Bajo estas premisas encontramos una oportunidad en el mercado de ofrecer un pack de alimentos listos para preparar en Lima Metropolitana, el cual mantendrá su valor nutricional y sabor casero. Por otro lado, el segmento al que nos dirigimos se caracteriza por su interés en obtener ingredientes frescos para la preparación de comida casera en menor tiempo, razón por la cual el producto representa un proyecto con gran potencial. En el presente trabajo se presentará un análisis sobre el mercado, factores macroeconómicos, investigación de la competencia y del segmento a atender. A partir de ese análisis se proponen objetivos, estrategias y tácticas que permitirán alcanzar las metas trazadas. Finalmente, se definirán los principales indicadores claves de éxito que permitirán supervisar cumplimiento de objetivos y rentabilidad del negocio. / An Adex report about trends and habits of the consumer in the year 2020, published on may of the same year, says that consumers have been revaluing their priorities in life, also their habits and behavior during this new normality, between the changes they mention more interest in their wellness, they prefer not to travel or eat outside, for the fear of catch the Covid-19 virus. They informed too, that these habits will remain after the pandemic. On the other side, the report says that according to data of the Nielsen consultant, there is an 10% -15% increase in the consume of fresh products compared with prepared food, which only increased in 8%. They talk about going back to home cooked food too. Under this premise, we found an opportunity in the market to offer meal packs ready to cook in Lima Metropolitana, this packs will remain their nutritional value and their homecooked flavor. On the other side, the segment we’re pointing to is specially interest on getting fresh ingredients for make homecooked meals in less time, which is the reason why, the project represents a big potential. In this project it will be present an analysis of the market , macroeconomic factors, competition investigation and the segment to attend .From that analysis we will propose targets, strategies and tactics that will allow us to reach the goal set. Finally, we will be defined the principal key succeed indicators that will allow to supervise the fulfillment of the target and the profitability of the project. / Trabajo de investigación

L’océan Austral est soumis à la redistribution globale des contaminants par les voies atmosphérique et océanique. Cependant, la contamination des écosystèmes austraux est très peu connue, en particulier dans le secteur Indien. De par leur toxicité, leur mobilité et leur capacité à se bioaccumuler dans les tissus des organismes et à se bioamplifier dans les réseaux trophiques, le mercure (Hg) et les polluants organiques persistants (POPs) comptent parmi les contaminants les plus préoccupants. Du fait de leur position élevée dans les réseaux trophiques, les oiseaux marins sont exposés à de grande quantités de contaminants par la voie alimentaire. En conséquence, ils sont souvent utilisés comme bioindicateurs de l’état de contamination des écosystèmes, par le biais des plumes et du sang, qui peuvent être échantillonnés de façon non destructive. Ma thèse s’est intéressée aux nombreuses espèces d’oiseaux marins (plus de 40) qui nichent au sein des Terres Australes et Antarctiques Françaises, au sud de l’Océan Indien, afin de décrire et expliquer les niveaux de contaminants le long d’un large gradient latitudinal, de l’Antarctique à la Zone Subtropicale, et d’identifier les meilleures espèces bioindicatrices pour un suivi à long terme de la contamination de ces écosystèmes. Au cours d’une première étape méthodologique, les manchots et les poussins de toutes les espèces ont été identifiés comme de bons bioindicateurs de contamination puisque, à la différence de la plupart des oiseaux adultes, ils présentent une faible variabilité des niveaux de contaminants dans les plumes. Au cours d’une seconde étape explicative, l’effet de facteurs intrinsèques (traits individuels) et extrinsèques (écologie alimentaire déduite grâce à la méthode des isotopes stables) sur les niveaux de contaminants a été évalué dans les plumes des oiseaux de la communauté de Kerguelen (27 espèces) et dans le sang du grand albatros de Crozet (180 individus dont les traits de vie sont connus). L’écologie alimentaire s’est avérée être le principal facteur explicatif des niveaux de contaminants, tandis que l’âge, le sexe, la phylogénie et le statut reproducteur jouent un rôle mineur. La classe d’âge est néanmoins un facteur à prendre en compte, puisque les poussins montrent souvent des concentrations inférieures aux adultes. Au cours d’une troisième étape, les variations spatio-temporelles de la contamination ont été étudiées en utilisant une sélection d’espèces bioindicatrices et en tenant compte de leur écologie alimentaire. Plusieurs résultats portant sur différentes espèces (oiseaux océaniques) et populations (poussins de skua) ont montré que, contrairement aux prédictions, l’exposition des oiseaux au Hg augmente graduellement des eaux antarctiques aux eaux subantarctiques puis aux subtropicales, alors que l’exposition aux POPs, en accord avec la théorie de la distillation globale, montre la tendance inverse. D’autre part, la comparaison des concentrations en Hg dans les plumes de manchot, effectuée entre des spécimens de musée et des échantillons actuels, indique que leur exposition au Hg n’a pas changée depuis les années 1950-1970. Toutefois, des espèces subantarctiques montrent une tendance à la hausse. De futures études devraient viser à l’utilisation des plumes comme tissu de référence pour l’évaluation et le suivi de la contamination des écosystèmes, en particulier en ce qui concerne les POPs. Parmi les nombreuses espèces étudiées au cours de ces travaux de thèse, les bioindicateurs les plus pertinents se révèlent être le manchot empereur et le pétrel des neiges (Antarctique), le manchot royal, le pétrel bleu et l’albatros à sourcil noirs (subantarctique), le gorfou sauteur subtropical et l’albatros à bec jaune (subtropical). Le suivi à long terme de ces espèces permettra d’évaluer l’évolution temporelle de l’état de contamination de l’océan Austral. / Antarctic and subantarctic marine environments are reached by inorganic and organic contaminants through ocean circulation and atmospheric transport. Yet, environmental contamination is poorly known in the Southern Ocean, in particular in the Indian sector. Among environmental contaminants, mercury (Hg) and persistent organic pollutants (POPs) are primarily of concern, because they are toxic, highly mobile, and they bioaccumulate in the tissues of living organisms and biomagnify up the food web. Seabirds, as upper predators, are exposed to large quantities of contaminants via food intake and have widely served as biomonitors of marine contamination, notably through the non-destructive sampling of their feathers and blood. My doctoral work has focussed on the abundant and diverse seabird species (more than 40) breeding in the French Southern and Antarctic Lands, southern Indian Ocean, in order to describe and explain contaminant concentrations over a large latitudinal gradient, from Antarctica to the subtropics, and to identify the best bioindicator species for contaminant biomonitoring. In a first methodological step, seabirds with synchronous moult of body feathers (adult penguins and chicks of all species) were recognised as good candidates as bioindicators, because, unlike most adult birds, they present low within-individual variation in feather contaminant concentrations. In a second explanatory step, the influence of intrinsic (individual traits) and extrinsic factors (feeding ecology inferred from the stable isotope method) driving variation in contaminant concentrations was evaluated in feathers of the large avian community of the Kerguelen Islands (27 species) and in blood of wandering albatrosses from the Crozet Islands (180 birds of known individual traits). Feeding ecology was the main factor driving variation in contaminant concentrations of blood and feathers, both at the community, population and individual levels, whereas age, sex, phylogeny and breeding status played a minor role. Age-class was however an important intrinsic factor to consider, with chicks usually having lower concentrations than adults. In a third step, spatio-temporal patterns of contamination were studied through selected bioindicator species and by taking into account their feeding habits. Results from different species (oceanic seabirds) and populations (skua chicks) showed that, contrary to predictions, Hg exposure gradually increases from Antarctic to subantarctic and subtropical waters, whereas, in accordance with the global distillation theory, POPs exposure has the opposite pattern. Comparisons between penguin feathers from museum collections and contemporary samples showed that bird exposure to Hg is overall not different today when compared to 50-70 years ago, but subantarctic species are possibly experiencing an increasing trend. Future research efforts should be focussed on the use of feathers as biomonitoring tools, in particular for POPs determination. The best recommended bioindicator species include the emperor penguin and snow petrel (Antarctic), king penguin, blue petrel and black-browed albatross (subantarctic), and northern rockhopper penguin and Indian yellow-nosed albatross (subtropical). Future biomonitoring studies on these species will give invaluable insights into the poorly-known temporal trends of environmental contamination in the Southern Ocean.

Please read the abstract in the section 00front of this document. Please note that pages 9 and 10 are missing from the available paper, as well as the microfiche copy. / Thesis (PhD (Zoology))--University of Pretoria, 2007. / Zoology and Entomology / unrestricted