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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Caracteriza??o da frequ?ncia de atividades a?reas do golfinho-rotador, Stenella longirostris (Gray, 1828), na Ba?a dos Golfinhos do Parque Nacional Marinho de Fernando de Noronha

Carli, Rita de C?ssia de 22 March 2012 (has links)
Made available in DSpace on 2014-12-17T15:37:09Z (GMT). No. of bitstreams: 1 RitaCC_DISSERT.pdf: 2507687 bytes, checksum: 4eeca6582506786804976f0255257b80 (MD5) Previous issue date: 2012-03-22 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / The aerial activities, leaps and slaps with parts of the body in the surface of water, are part of the behavioral repertoire of several species of cetaceans. Among them, the spinner dolphin, Stenella longirostris, shows greater diversity in such behavior. For the spinner dolphins of Fernando de Noronha, the aerial activities are classified as vertical and horizontal, with eight patterns to be noted (tail slap, head slap, motor boating, partial leap, leap, spin, tail over head and tail over head with spin) discriminated between these categories. Such behaviors can be used as a parameter to identify behavioral changes, as well as patterns of daily and seasonal activity. In this manner, this study aimed to characterize the frequency in performance of such activity while the dolphins were within the Dolphin Bay of Fernando de Noronha, and verify possible daily and seasonal hourly fluctuations on such behaviors. The data analyzed in this study was acquired during the period of January 2006 through December 2010, totaling 1431 days of observation from land set point, with 113027 aerial activities registered, daily average of 72,27 (SD=96,10). During 5478h and 54 min of observation the horizontal aerial activity was the most observed and rotation was the most executed pattern. Greater frequency of execution of aerial activity was observed in adults, but for both adults and calves, was observed a predominance of horizontal activities, with spin being the pattern most executed. Positive correlation was observed between the amount of aerial activity performed and the number of animals inside the Bay. Hourly daily fluctuation was observed in the expression of aerial activities by spinner dolphins, and was observed a peak of activity between 8h and 8h59min for the overall frequency relative of aerial activities, as well as for the categories and patterns. Seasonal differences were observed between the rainy and dry season with the greater amount of activity being observed during the rainy season. Nevertheless, the same profile of frequency relative of aerial activity was observed in both seasons with the peak amount being during the same period. When discriminated the aerial activities in categories and patterns, for both seasons, there was a similar pattern of hourly fluctuation; for most of parameters, higher frequency relative of execution of aerial activity remain between 8h and 8h59min / As atividades a?reas, saltos e batidas com partes do corpo na superf?cie da ?gua, comp?em parte do repert?rio comportamental de diversas esp?cies de cet?ceos. Dentre elas, acredita-se que o golfinho-rotador, Stenella longirostris, seja a esp?cie que apresenta maior agilidade em tais comportamentos. Para os golfinhos-rotadores de Fernando de Noronha, as atividades a?reas s?o categorizadas em atividades a?reas verticais e horizontais, sendo oito (batida de cauda, batida de cabe?a, motor de popa, ca?da, salto, rota??o, invers?o e pirueta) os padr?es discriminados entre essas classes. Tais comportamentos podem ser usados como par?metros para identificar altera??es comportamentais, bem como os padr?es de atividade di?ria e sazonais. Desta forma, o presente estudo teve por objetivo caracterizar a frequ?ncia de execu??o de atividades a?reas no decorrer do per?odo em que os golfinhos-rotadores permanecem dentro da Ba?a dos Golfinhos de Fernando de Noronha, bem como verificar a exist?ncia de poss?veis flutua??es hor?rias di?rias e sazonais na exibi??o de tais comportamentos. Para isso, foram analisados dados que compreendem o per?odo entre janeiro de 2006 a dezembro de 2010, totalizando 1.431 dias de observa??o em ponto fixo, sendo registradas 113.027 atividades a?reas, m?dia di?ria de 72,27 (DP=96,10). Nas 5.478 horas e 54 minutos de observa??o, as atividades a?reas horizontais foram observadas em maior frequ?ncia, sendo a rota??o o padr?o mais executado. Maior frequ?ncia de execu??o das atividades a?reas foi observada em indiv?duos adultos, mas tanto para adultos quanto para filhotes, observou-se predom?nio das atividades horizontais, com a rota??o sendo o padr?o mais executado. Correla??o positiva foi observada entre a quantidade de atividades a?reas executadas e o n?mero de animais dentro da Ba?a. Flutua??o hor?ria di?ria foi observada na express?o das atividades a?reas pelos golfinhos-rotadores, sendo observado maior pico de atividade no hor?rio entre 8h e 8h59min, tanto para a frequ?ncia relativa total de atividades a?reas, quanto para as classes e os padr?es. Diferen?as entre as esta??es clim?ticas seca e chuvosa foram observadas, com maior registro de atividade a?rea durante o per?odo de chuvas. Entretanto, o perfil de distribui??o da frequ?ncia relativa de atividades a?reas se assemelha para ambas as esta??es, mantendo o hor?rio de maior pico de atividade. Quando discriminadas as atividades a?reas nas classes e nos padr?es considerados, para ambas as esta??es observaram-se padr?o de flutua??o hor?ria semelhante; para a maioria dos par?metros analisados, maior frequ?ncia relativa de execu??o das atividades a?reas se mant?m entre 8h e 8h59min
2

Ocupa??o de ?rea e intera??es de golfinhos-rotadores (Stenella longirostris) com o turismo n?utico no Arquip?lago de Noronha/PE, Brasil

Tischer, Marina Consuli 29 March 2011 (has links)
Made available in DSpace on 2014-12-17T15:37:04Z (GMT). No. of bitstreams: 1 MarinaCT_DISSERT_pag1_ate_pag15.pdf: 10459545 bytes, checksum: bd3fb5e5db3d1c521824ec8eb3c3b82c (MD5) Previous issue date: 2011-03-29 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / Several works characterize the presence of spinner dolphins at Fernando de Noronha Archipelago in the Dolphins Bay. Though, the dolphins abidance inside this cove has decreased and a new area has been occupied by the animals to achieve the same behaviors, that are resting, breeding and nursing. This area comprises the Inside Sea northeast border of Fernando s de Noronha Island, including the opposing Middle and Dog shore area, the San Antonio Bay and the Between Islands region. The aim was to characterize the dolphins occupation and describe their interactions with the tourism in this area. Data were collected in 2008 and 2009 through a fixed point observation. The study area was divided into seven sub-areas, recording: presence/absence of dolphins, days abidance endurance, abidance length in each area, estimated number of individuals, dolphins direction and speed of displacement, boats presence, interaction period, monitoring, boats attitude and velocity. The dolphins abidance time displayed the same pattern during both years of study, with the higher occupancy in the Between Islands region. Groups with farther than 200 individuals were more frequent both 2008 (46.2%) and 2009 (42.3%). Thus the displacement s slow speed as the preferred direction towards Rat Island also showed the same pattern in both years. The Between Islands region also presented the boats major abidance near the dolphins groups. Boats moved farther in slow speed (95%) than at high speed (5%). The legislation s compliance for the cetaceans protection occurred in 89.7% of 2.839 interactions between boats and spinners, in which this variable was recorded. Whenever boats moved at a slow speed during the meetings with spinner dolphins groups, animals also moved at a slow speed (n = 337), significantly more than the fast displacements (n = 128) ix or "porpoise" (n = 4) (X2 = 318.543, p = -0.001). When boats quickly passed by groups, a significant difference between the dolphins displacement speeds was observed (X2 = 18.264, p =- 0.001), however, the slow (47%) and fast (47% ) displacements frequency was equal, noted the difference with the porpoise displacements (6%), which had the lowest frequency. Data indicate the establishment of a new occupation pattern of the spinner dolphins at Fernando de Noronha, with the Between Islands area being of great importance to the dolphins habits and currently the main area of the boats meeting with the dolphins, showing the need of new conservation measures in this area / Diversos trabalhos caracterizam a presen?a de golfinhos-rotadores no Arquip?lago Fernando de Noronha na Ba?a dos Golfinhos. Entretanto, o tempo de perman?ncia dos golfinhos nesta enseada tem diminu?do e uma nova ?rea vem sendo ocupada pelos animais para a realiza??o dos mesmos comportamentos, que s?o descanso, reprodu??o e cuidados com os filhotes. Esta ?rea compreende a extremidade nordeste do Mar de Dentro da Ilha Fernando de Noronha, incluindo a ?rea defronte as praias do Meio e do Cachorro e toda a Ba?a de Santo Ant?nio e Regi?o Entre Ilhas. O presente estudo objetivou caracterizar a ocupa??o dos golfinhos e descrever as intera??es com o turismo nesta ?rea. Os dados foram coletados atrav?s de ponto fixo em 2008 e 2009. A ?rea de estudo foi dividida em sete sub?reas e os registros foram: presen?a/aus?ncia de golfinhos, tempo de perman?ncia no dia, tempo de perman?ncia em cada sub?rea, estimativa do n?mero de indiv?duos, dire??o e velocidade de deslocamento dos golfinhos, presen?a de barcos, tempo de intera??o, acompanhamento, atitude e velocidade de deslocamento das embarca??es. O tempo de perman?ncia dos golfinhos mostrou o mesmo padr?o nos dois anos do estudo, sendo a Regi?o Entre Ilhas a com maior ocupa??o. Os agrupamentos com mais de 200 indiv?duos foram os mais freq?entes, tanto em 2008 (46,2%) como em 2009 (42,3%). A dire??o preferencial de deslocamento sentido Ilha Rata e a velocidade de deslocamento lenta tamb?m mostraram o mesmo padr?o nos dois anos. A Regi?o Entre Ilhas tamb?m foi a que apresentou o maior tempo de perman?ncia dos barcos pr?ximos aos grupos de golfinhos. As embarca??es significativamente se deslocaram mais em velocidade lenta (95%) dos que em alta velocidade (5%). O cumprimento da legisla??o de prote??o aos cet?ceos ocorreu em 89,7% das 2.839 intera??es entre barcos e vii rotadores em que foi registrada esta vari?vel. Quando as embarca??es se deslocaram em velocidade lenta durante os encontros com os agrupamentos de golfinhos-rotadores, os animais tamb?m se deslocaram em velocidade lenta (n=337), significativamente mais do que os deslocamentos r?pidos (n=128) ou porpoise (n=4) (X2=318,543; p= -0,001). J? quando as embarca??es passaram r?pido pelos agrupamentos de golfinhos, observou-se diferen?a significativa entre as velocidades de deslocamentos dos golfinhos (X2=18,264; p=-0,001), entretanto, as freq??ncias de deslocamentos lentos (47%) e r?pidos (47%) foi igual, sendo a diferen?a notada com os deslocamentos em porpoise (6%), que apresentou a menor freq??ncia. Os dados indicam o estabelecimento de um novo padr?o de ocupa??o dos golfinhosrotadores em Fernando de Noronha, sendo a Regi?o Entre Ilhas de grande import?ncia para os h?bitos dos golfinhos e atualmente a principal ?rea de encontro das embarca??es com os golfinhos, mostrando a necessidade de novas medidas de conserva??o nesta ?rea

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