The social organization of the vicuna (Vicugna vicugna) and its relationship to the environment were studied at the Pampa Galeras National Vicuna Reserve in southern Peru from May 1968 to April 1971. 2 Behavioral data were collected on groups within a grid of 12.4 km during 3,800 hours of observation. The vicuna's alpine grassland environment was characterized by greatly fluctuating and freezing temperatures, light precipitation, high evaporation, wind, short growing seasons, shallow and infertile soils and low plant production. Vicuna habitat quality was dependent upon high producing, preferred vegetation types and close access to permanent water and a sleeping area. Only one-third of the Reserve was good habitat and less than 20 percent of the Cupitay Valley study area was preferred by feeding vicuna. Territorial behavior has evolved in this environment where food resources are generally in short supply, annually renewed on locally abundant patchy sites, but predictable in time and space and xvi defendable. Nearly 90 percent of females 2 years and older were pregnant at the beginning of the birth season and 90 percent of all births occurred between 22 February and 7 April. Ten to 30 percent of the crias (juveniles) died during their first 4 months. Five social units were distinguished, with the population primarily composed of Male Groups (MGs) and family groups: Permanent Territorial Family Groups (PTFGs) occupied good habitat and Marginal Territorial Family Groups (MrFGs) secondary habitat. Most PTFGs and MrFGs each occupied a year-round feeding territory in the day and a separate sleeping territory at night. Average group size for PTFGs was six (one male, three females and two crias) and they composed about 55 percent of the population. MrFGs were smaller (five), composed 40 percent of the population, had lower reproductive success and spent less time in their feeding territories than PTFGs. Non-territorial MGs averaged 20 animals and were chased out of zones occupied by PTFGs and MrFGs. As the number of groups increased, the frequency and intensity of territorial defense by males also increased. Territories provided a place free from intraspecific interference where females could feed, sleep, mate, give birth and raise their young. Feeding territories averaged 18 ha and sleeping territories 3 ha in size. A small cluster of sleeping territories on the flattened ridge formed a cummunal sleeping area for groups using the adjacent valleys. MGs and MTFGs made greater use of ridges and the non-preferred b1.tt1.ch grass communities, because they were excluded from preferred areas occupied by PTFGs. Group size was significantly (P

The socioecological model offers a framework for attempting to explain variation in sociality based on differences in ecological and social factors such as resource distribution, predation pressure, and infanticide risk. Orangutans are unusual among higher primates in their low degree of sociality and are considered to be semi-solitary. Their limited social behavior is thought to be a result of weak predation pressure on these large-bodied apes, coupled with the low and unpredictable fruit productivity that is characteristic of their habitat. Orangutans do come together occasionally, and there appears to be variability in the gregariousness of different populations. Orangutans present a unique opportunity to examine both social and solitary conditions within a single population to test predictions regarding the costs and benefits of sociality. This study assesses the ecological and social context in which social parties occur in Gunung Palung National Park on the island of Borneo. The potential costs of these associations are evaluated using behavioral and physiological markers of stress and parasite infection patterns. Fruit availability is predicted to influence the frequency of social associations, with sociality increasing when fruit availability is high. While the socioecological model predicts that female orangutans display reduced sociality, this should affect females in different reproductive (and hence, energetic) states differently. The results of this study confirmed that fruit availability influences the occurrence of social events and revealed adolescent females to be the most social age-sex class. Adolescent females displayed the most affiliative behaviors and engaged in notable sexual rituals with flanged males. They sought and maintained social associations with others, particularly their mothers. Despite evident signs of anxiety, adolescent females did not display elevation in the stress hormone cortisol under social conditions, while adult females and flanged males did. Intestinal parasites were widespread in this population, and the prediction for elevated parasite prevalence in more social classes was unsupported. This study revealed a greater degree of gregariousness than orangutans are typically credited with, and highlights the adolescent period as behaviorally distinct and socially rich for female orangutans who face unique challenges as members of a semi-solitary species with high levels of sexual coercion. / 2020-02-28T00:00:00Z

Please read the abstract on page 3. Copyright 1975, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. Please cite as follows: Underwood, R 1975, Social behaviour of the Eland (Tayrotragus Oryx) on Loskop Dam Nature Reserve, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd-02212012-134828 / > E12/4/130/gm / Dissertation (MSc)--University of Pretoria, 1975. / Zoology and Entomology / unrestricted

The social organization of the vicuna (Vicugna vicugna) and its relationship to the environment were studied at the Pampa Galeras National Vicuna Reserve in southern Peru from May 1968 to April 1971. 2 Behavioral data were collected on groups within a grid of 12.4 km during 3,800 hours of observation. The vicuna's alpine grassland environment was characterized by greatly fluctuating and freezing temperatures, light precipitation, high evaporation, wind, short growing seasons, shallow and infertile soils and low plant production. Vicuna habitat quality was dependent upon high producing, preferred vegetation types and close access to permanent water and a sleeping area. Only one-third of the Reserve was good habitat and less than 20 percent of the Cupitay Valley study area was preferred by feeding vicuna. Territorial behavior has evolved in this environment where food resources are generally in short supply, annually renewed on locally abundant patchy sites, but predictable in time and space and defendable. Nearly 90 percent of females 2 years and older were pregnant at the beginning of the birth season and 90 percent of all births occurred between 22 February and 7 April. Ten to 30 percent of the crias (juveniles) died during their first 4 months. Five social units were distinguished, with the population primarily composed of Male Groups (MGs) and family groups: Permanent Territorial Family Groups (PTFGs) occupied good habitat and Marginal Territorial Family Groups (MTFGs) secondary habitat. Most PTFGs and MTFGs each occupied a year-round feeding territory in the day and a separate sleeping territory at night. Average group size for PTFGs was six (one male, three females and two crias) and they composed about 55 percent of the population. MTFGs were smaller (five), composed 40 percent of the population, had lower reproductive success and spent less time in their feeding territories than PTFGs. Non-territorial MGs averaged 20 animals and were chased out of zones occupied by PTFGs and MTFGs. As the number of groups increased, the frequency and intensity of territorial defense by males also increased. Territories provided a place free from intraspecific interference where females could feed, sleep, mate, give birth and raise their young. Feeding territories averaged 18 ha and sleeping territories 3 ha in size. A small cluster of sleeping territories on the flattened ridge formed a cummunal sleeping area for groups using the adjacent valleys. MGs and MTFGs made greater use of ridges and the non-preferred bl.lllch grass communities, because they were excluded from preferred areas occupied by PTFGs. Group size was significantly (P<.05) correlated with territory size and total forage production (P<.01) within feeding territories. The territorial male had a major role in the social organization of a population, since he established the location, borders and size of feeding territories. He also regulated the size of his family group by expelling the lowest ranking and youngest members before they became 1 year old (male and female crias), and by accepting or rejecting outsiders attempting to join. Marginal habitat within Cupitay Valley and vacant habitat in surrounding areas became filled by dispersing animals as the total population in the Reserve increased 36 percent during the study.

京都大学 / 0048 / 新制・課程博士 / 博士(理学) / 甲第19920号 / 理博第4220号 / 新制||理||1606(附属図書館) / 33006 / 京都大学大学院理学研究科生物科学専攻 / (主査)教授 古市 剛史, 教授 湯本 貴和, 教授 平井 啓久 / 学位規則第4条第1項該当 / Doctor of Science / Kyoto University / DFAM

京都大学 / 0048 / 新制・課程博士 / 博士(理学) / 甲第20217号 / 理博第4302号 / 新制||理||1618(附属図書館) / 京都大学大学院理学研究科生物科学専攻 / (主査)准教授 半谷 吾郎, 教授 湯本 貴和, 教授 平井 啓久 / 学位規則第4条第1項該当 / Doctor of Science / Kyoto University / DFAM

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Submitted by PPG Zoologia (zoologia-pg@pucrs.br) on 2018-07-26T17:32:12Z No. of bitstreams: 1 Dissertac?a?o de Mestrado_Thiago Cavalcante_2018.pdf: 1062183 bytes, checksum: df6896e683973408161b744df41a770f (MD5) / Approved for entry into archive by Sheila Dias (sheila.dias@pucrs.br) on 2018-08-01T12:02:05Z (GMT) No. of bitstreams: 1 Dissertac?a?o de Mestrado_Thiago Cavalcante_2018.pdf: 1062183 bytes, checksum: df6896e683973408161b744df41a770f (MD5) / Made available in DSpace on 2018-08-01T12:21:57Z (GMT). No. of bitstreams: 1 Dissertac?a?o de Mestrado_Thiago Cavalcante_2018.pdf: 1062183 bytes, checksum: df6896e683973408161b744df41a770f (MD5) Previous issue date: 2018-02-16 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Group living animals, like most primates, benefit from a reduction in predation risk and an improvement in their potential to compete for food with other groups. However, gregariousness also increases intragroup food competition that can modulate within-group agonism and interindividual spatial patterns. We evaluated the influence of fruit availability and consumption (degree of frugivory) on the agonistic behavior and interindividual distance in two populations of Gray woolly monkeys living in forest fragments in southwestern Brazilian Amazonia. We recorded 165 intragroup agonistic interactions in a feeding context via the ?all occurrences? method and 3,549 records of spacing via scan sampling. Fruit consumption presented a direct relationship with agonistic and spacing behavior, whereas our estimate of fruit availability was a good predictor only for spacing. Woolly monkey selection of food patches composed of trees with diameter at breast height almost fourfold than that of the trees found in the phenology plots might explain the lack of relationship between fruit availability and agonism. The proportion of time (50%) that woolly monkeys had no nearby (<5 m) neighbors is compatible with a strategy of reducing intragroup fruit competition by managing interindividual distances. In sum, we presented the first evidence of aggressive intragroup feeding competition in Lagothrix cana and demonstrate the influence of fruit availability and consumption on some aspects of the social system of woolly monkeys. / Animais que vivem em grupo, como a maioria dos primatas, s?o beneficiados por uma redu??o no risco de preda??o e um aumento na possibilidade de defesa cooperativa dos recursos. Por?m, a vida em sociedade aumenta a competi??o intragrupo por alimento, a qual pode modular as intera??es agon?sticas e o espa?amento interindividual. Avaliamos a influ?ncia da disponibilidade de frutos e seu consumo (grau de frugivoria) no comportamento agon?stico e espa?amento interindividual de duas popula??es de macacos-barrigudos em fragmentos florestais na Amaz?nia brasileira. Registramos 165 intera??es agon?sticas intragrupo no contexto de alimenta??o via m?todo de ?todas as ocorr?ncias? e 3549 registros de espa?amento via m?todo de ?varredura instant?nea?. O consumo de frutos apresentou uma rela??o direta com o comportamento agon?stico e o espa?amento interindividual, enquanto a disponibilidade de frutos foi um bom preditor apenas do espa?amento. A explora??o pelos barrigudos de locais de alimenta??o com ?rvores com di?metro ? altura do peito quase quatro vezes maior do que as ?rvores monitoradas para a an?lise da disponibilidade de frutos pode explicar a aus?ncia de rela??o com o agonismo. A propor??o do tempo (50%) na qual os barrigudos estiveram sem vizinhos pr?ximos (<5 m) ? compat?vel com uma estrat?gia de redu??o da competi??o intragrupo por frutos via manuten??o do distanciamento interindividual. Em suma, apresentamos as primeiras evid?ncias de competi??o agressiva intragrupo para Lagothrix cana e demonstramos a import?ncia da disponibilidade e consumo de frutos em moldar alguns aspectos do sistema social dos barrigudos.