Acoustic signals are widely used by fish such as pomacentrids, to communicate during courtship and agonistic activities. Adult Stegastes lividus holds a permanent territory in a coral reef environment. Previous studies suggested that S. lividus seems to produce clicking sounds when intruders close to its territory. This study aimed to describe (1) the sounds produced by this species; (2) the behavioral pattern associated with these acoustic signals; (3) vocal activity of diurnal variation. The study site was near the water inlet of the Third Nuclear Power Plant in southern Taiwan (120¡C45¡¬E , 21¡C57¡¬N). 24-hour recordings at the habitat of S. lividus at 5-6 m and at 2-3 m were made in February, March and April, 2005. The synchronous video-audio recordings were also made at the colonies of S. lividus at 2-3 m. The observations showed that S. lividus produced clicking sounds for territorial defense (e.g. aggressive behavior). These sounds were composed of a variable number of pulses that had a dominant frequency at 200 to 400 Hz. Stegastes lividus produced different sound types to defend against conspecifics or heterospecifics. Although the acoustic signals were emitted throughout all day, more sounds were recorded during the noon, fewer sounds at night, and a small peak presented at sunset. Therefore, I suggested the acoustic signals of S. lividus may be also serves as species recognition. The fish may be a diurnal fish, and its social interaction peaks at noon.

Thesis (Ph. D.)--North Carolina State University, 2003. / Title from PDF t.p. (viewed on Aug. 21, 2004). Includes vita. Includes bibliographical references.

Tyrimo tikslas – atskleisti tėvų pablogėjusios nuotaikos (depresiškumo ir streso) bei ikimokyklinio amžiaus vaikų agresyvaus elgesio bei fizinių negalavimų tarpusavio sąsajas. Tyrime dalyvavo 110 tėvų, auginančių 3 – 6 metų amžiaus vaikus (95 moterys ir 15 vyrų). Tėvų vidutinis amžius 32 metai. Vaikų vidutinis amžius 4,5 metai; 57 berniukai ir 53 mergaitės. Tėvų apklausa buvo atlikta Kauno lopšelyje-darželyje „Naminukas“ ir Kauno menų darželyje "Etiudas". Tiriamiesiems buvo pateikiamas klausimynas kurį sudarė subjektyviai suvokto streso skalė, Zungo depresijos skalė ir elgesio ikimokykliniame amžiuje klausimynas. Taip pat buvo pateikti penki klausimai apie vaiko fizinius negalavimus ir du papildomi klausimai apie vaiko ligas. Tyrimo rezultatai parodė, kad ikimokyklinio amžiaus vaikams labiausiai būdingas fizinis nusiskundimas yra pilvo skausmas. Tirtų vaikų grupėje agresyvių vaikų nei neagresyvių yra daugiau. Lyginant berniukus ir mergaites, tiek neagresyvių vaikų, tiek agresyvių vaikų grupėje abiejų lyčių pasiskirstymas yra panašus. Esant pablogėjusiai tėvų nuotaikai (daug patiriamo streso ir didelis depresiškumas) ikimokyklinio amžiaus vaikams pasireiškia daugiau agresyvaus elgesio požymių nei tiems vaikams, kurių tėvai nepasižymi pablogėjusia nuotaika (mažai patiriamo streso ir mažas depresiškumas). Agresyvūs ikimokyklinio amžiaus vaikai patiria daugiau fizinių negalavimų – galvos, pilvo ir skrandžio skausmų – nei neagresyvūs vaikai. Esant pablogėjusiai tėvų nuotaikai... [toliau žr. visą tekstą] / The aim of the study was to assess the relationship between parent’s depressive mood and preschool age children aggressive behavior and physical symptoms. The subjects of the study were 110 parents who were growing 3 – 6 years old children. The mean of parent’s age was 32 year. The mean of children age was 4,5 year; 57 boys and 53 girls. Parents were quizzed in the Kaunas kindergarten “Naminukas” and Kaunas art kindergarten "Etiudas". There was given the questionnaire for the respondents which was made of tree scales: Perceived Stress Scale, Zung Self Rating Scale, Preschool Behavior Questionnaire (PBQ). Also five questions about child‘s physical symptoms and two extra questions about child’s diseases were given. The results showed that the most common physical symptom of preschool children is abdominal pain. There are more aggressive children than not aggressive children in the group of studied children. Comparing boys and girls the number of aggressive and not aggressive children is similar. When parent’s mood is depressive (high level of stress and depression) preschool age children show more symptoms of aggressive behavior than those children whose parents’ mood is not depressive. Aggressive preschool age children feel more physical symptoms than not aggressive children. When parent’s mood is depressive (high level of stress and depression) preschool age children feel more physical symptoms than those children whose parents’ mood is not depressive.

The behaviour of captive mallards (Anas platyrhynchos) and black ducks (Anas rubripes) was studied from the end of March to mid-June in 1991 and 1992 to determine the extent of interspecific aggression exhibited and the effect of sympatry and allopatry on interactions between the two species. / Mallards were more aggressive than black ducks regardless of sex and origin, though both species were equally attacked in both years, male ducks were more aggressive and more attacked than female ducks regardless of species and origin in both years, and ducks of sympatric origin were more aggressive than ducks of allopatric origin in 1991 regardless of sex and species while the opposite was true in 1992. / Site attachment was observed in 7 of 9 experiments performed in 1992. In the experiments involving site attachment, almost all of the activity centered around the feeding stations, not around the nesting platforms.

Thesis (Ph. D.)--Ohio University, August, 2004. / Includes bibliographical references.

Thesis (Ph. D.)--University of Missouri-Columbia, 1996. / Typescript. Vita. Includes bibliographical references. Also available on the Internet.

Thesis (Ph. D.)--University of Missouri-Columbia, 1996. / Typescript. Vita. Includes bibliographical references. Also available on the Internet.

Thesis (Ph.D.)--Ohio University, August, 2004. / Title from PDF t.p. Includes bibliographical references.

Made available in DSpace on 2014-06-11T19:30:31Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-02-26Bitstream added on 2014-06-13T21:01:17Z : No. of bitstreams: 1 carvalho_tb_dr_jabo.pdf: 519619 bytes, checksum: e4ba444d5a227e52fbabd17b5ed6684e (MD5) / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / Universidade Estadual Paulista (UNESP) / Alterações no ambiente aquático, provocadas por ações antrópicas no ambiente natural ou artificial, causam mudanças em fatores físicos (ex: luminosidade) que podem afetar o comportamento e a fisiologia dos peixes. Assim, foi testado o efeito da luminosidade sobre o comportamento agressivo, a hierarquia social, indicadores de estresse e os níveis de esteróides sexuais em ciclídeos. Para isso, foram realizados 4 experimentos. Experimento I: foi avaliada a influência da intensidade luminosa sobre a agressividade em juvenis de Geophagus proximus, Oreochromis niloticus e Pterophyllum scalare. Foram comparadas duplas submetidas a duas intensidades luminosas (253,56 ± 62,25 lx e 1.435,92 ± 481,40 lx). A maior luminosidade reduziu a agressividade em O. niloticus, aumentou em P. scalare e não afetou a de G. proximus. Observou-se também que o nível de agressividade em O. niloticus foi maior que em G. proximus, que, por sua vez, foi maior que P. scalare. Isso sugere que a intensidade luminosa modula diferentemente a interação de peixes sociais, podendo o mecanismo estar associado aos padrões de agressividade de cada espécie. Experimento II: foi testada a influência da intensidade luminosa sobre o comportamento agonístico e indicadores de estresse (taxa ventilatória e atividade da catalase) em fêmeas de Tilapia rendalli. Foram comparadas duas intensidades luminosas: menor (253,56 ± 62,25 lx) e maior (1.435,92 ± 481,40 lx) em condições social (dupla) e de isolamento. A menor luminosidade aumentou a freqüência de ataques na dupla e no dominante, mas não afetou a interação do submisso. A taxa ventilatória do animal isolado foi maior na menor intensidade de luz. Assim, conclui-se que a luminosidade afeta a agressividade e atua como um estressor em fêmeas de T. rendalli. No entanto, essa resposta estressora pode não funcionar como o mecanismo causador do efeito da... / Animals show behavioral and physiological changes due to variations of environmental physical factors. Thus, we compared the effect of luminosity on agonistic behaviour, hierarchy settlement, stress, and plasma sexual steroids levels in cichlids. Experiment I: we compared the effect of light intensity on agonistic behavior of pair juvenile cichlids Geophagus proximus, Oreochromis niloticus and Pterophyllum scalare under two light intensities ( minor: 253.56 ± 62.25 lx and major: 1435.92 ± 481.40 lx). Major light intensity reduced aggressiveness in O. niloticus; increased in P. scalare and did not affect agonistic interactions in G. proximus. In the 2 light conditions, the aggressiveness level in O. niloticus is higher than G. proximus and P. scalare. We concluded rising light intensity affects agonistic interaction in different way in the three fish species, and mechanism underlying this data could be related to specific agonistic profile. Experiment II: we tested the influence of light intensity on aggressive behavior and indicators of stress (ventilatory frequency and catalase activity) in adult females of Tilapia rendalli. A minor (253.56 ± 62.25 lx) and major (1435.92 ± 481.40 lx) light intensity were compared in social condition (pair) and isolation. The pair and winner exhibited higher agonistic interactions at major intensity group, but luminosity did not affect attacks in loser. The ventilatory frequency of isolated animal was higher in the minor light intensity. Thus, we concluded that the luminosity affects the aggressiveness and it is a stressor in females of T. rendalli. However, that stressful event can not be main causing mechanism of the light intensity on agonistic behavior effect. Experiment III: we evaluated the effect of the light intensity on social hierarchy settlement and indicators of stress (hematocrit and glycemia) in males of Oreochromis niloticus... (Complete abstract click electronic access below)

Orientador: Eliane Gonçalves-de-Freitas / Banca: Gelson Genaro / Banca: Percília Cardoso Giaquinto / Resumo: Animais sociais interagem agressivamente para estabelecer territórios e hierarquia de dominância. Para evitar lutas constantes e reduzir a probabilidade de injúrias, eles mantêm a posição social por meio de displays e outros tipos de sinalização social. Em algumas espécies de peixes, sinais químicos que sinalizam a posição social são liberados na água. Porém, a troca da água em aquários ou tanques de criação (necessária para remover restos de alimentos e materiais orgânicos) diluem os sinais químicos, atrapalhando a comunicação social e o reconhecimento da posição social. O resultado é um aumento e persistência da interação agressiva, o que pode causar severas injúrias físicas e aumentar o nível de estresse social nos peixes. Nesse estudo, perguntamos se a agressividade está associada com os níveis de sinais químicos diluídos. Assim, foi testado o efeito da quantidade de água do aquário renovada na agressividade e estabilidade social em dois ciclídeos neotropicais, o Pterophyllum scalare e o Cichlasoma paranaense, pois o mecanismo pode variar entre espécies. Observamos para P. scalare que a renovação de uma pequena quantidade de água (25%) interfere menos no comportamento agressivo dos indivíduos dentro do grupo social do que uma maior quantidade de água (50%). Além disso, a agressividade rapidamente retorna a níveis basais. Em contraste a renovação de 50% da água parece reduzir as interações agressivas no grupo de C. paranaense. Assim, esses efeitos podem estar associados a... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Social animals interact aggressively to establish territories and social hierarchy. To avoid constant fights and reduce the probability of injuries, they signalize social rank by means of displays and other types of signaling. In some fish species, chemicals that signalize social rank are released into the water. However, the water renewal in aquaria or breeding tanks (required to remove food leftovers and organic materials) dilutes the chemicals, therefore impairing social communication and rank recognition. The result is an increased and constant group aggressive interaction that may cause severe physical injuries, and raise fish's social stress levels. In this study, it was asked whether the aggressiveness is associated with the levels of chemicals diluted. Then, it was tested the effect of the amount of aquarium's water renewed on the aggressiveness and social stability in two Neotropical cichlids, Pterophyllum scalare, and Cichlasoma paranaense, as the mechanisms can vary according to the species. It was noticed to P. scalare that the renovation of a small amount of aquarium's water (25%) interfere less in aggressive behavior of individuals within the social group than in higher changing water (50%). Aggressiveness, moreover, quickly returns to basal levels. In contrast, the renewal of 50% of water seems to reduce aggressive interactions in C. paranaense's social groups. Thus, these effects may be associated with different mechanisms of social signaling between the cichl... (Complete abstract click electronic access below) / Mestre