Magister Scientiae (Biodiversity and Conservation Biology) - MSc (Biodiv and Cons Biol) / Due to their popularity for tourism, giraffes are being introduced into Thicket areas within the Little Karoo region of the Western Cape. However, information regarding the activity budgets and diet selection of these giraffes is lacking. Therefore, this study aimed to achieve three objectives; to determine the diurnal activity budget, diet composition and browsing levels, and the estimated browsing capacities of extralimital giraffe. The study was conducted on two privately owned farms, namely Kareesbos Private Game Reserve and Tsumkwe Private Game Reserves. Observations were completed on both study sites using the interval scan method, whereby observations were conducted on all visible individuals from 6 am – 6 pm for four days every 3 months (winter, spring, summer and autumn). Observations found browsing to be the most dominant activity displayed by both populations, with walking and rumination being the second and third most dominant activity. Females browsed more than males in both study sites. Dietary observations showed four species (Pappea capensis, Portulacaria afra, Euclea undulata and Searsia longispina) and five species (Searsia longispina, Euclea undulata, Pappea capensis, Vachellia karroo and Grewia robusta) to comprise approximately 90% and 80% of their diet in Kareesbos and Tsumkwe respectively. The importance of flower bearing species (Lycium spp. and Rhigozhum obovatum) increased during the spring and summer seasons in both study sites. In addition to the diet selection, browsing by both giraffe populations was shown to occur mostly below 2 m. Estimated browsing capacities for Kareesbos and Tsumkwe were 25 and 21, and 107 and 88 ha per giraffe, respectively, for the respective browse height strata of less than two metres and five metres. It is suggested that browsing capacities of less than two metres be considered when stocking giraffe and the number of individuals adjusted accordingly on each farm, due to the continuous low browsing of giraffe at less than two metres. Furthermore, results indicate that these giraffes have adapted to take advantage of forage available in ecosystems outside their natural ranges. Low foraging heights suggests possible niche overlap with other browsers, which may result in increased competition for food when it becomes limited. Long term ecological monitoring of extralimital populations and appropriate management procedures are therefore required to avoid the displacement and degradation of indigenous fauna and flora within the Little Karoo, and possible mortalities amongst the giraffe populations.

At present, the Florida Burrowing Owl is being threatened by extensive habitat development throughout their small range in the state. Unfortunately, developers are able to collapse burrowing owl burrows during the non-breeding season and flush the owls from an area. In other areas such as Arizona and British Columbia translocation is being utilized to mitigate the effects of development on burrowing owls. In March 2006, the only translocation of burrowing owls in Florida was conducted by Mosaic Phosphate Company. The purpose of this thesis was to elucidate the effects of translocation on Florida burrowing owls. Topics of research include activity budgets, insect trapping, burrowing owl diet, prey availability, and hatching success for two populations of Florida burrowing owls in Hillsborough and Polk Counties, Florida. Results of this study indicate that translocation has little effect on Florida Burrowing Owl activity budgets. There were significant differences in scanning, time spent in the burrow, and resting between the control and treatment groups (p < 0.05). Though differences in behavior were present between translocated and non-translocated study groups, there was no statistically significant difference (p < 0.025) between the pre-and post translocation study group. Results of the prey availability study indicate that while there are significantly different amounts of arthropods between study areas (p < 0.025), a threshold or satiation point may have been reached at these areas, as trapping results do not match diet results. This satiation point may have been due to cattle dung present at the burrowing owl's breeding areas, which provides a micro-habitat for many prey items. While hatching success was lower for the post translocation group compared to the pre-translocation group, hatching success also was decreased for the control group.This overall decrease indicates that translocation was not the main factor affecting the hatching success of our study groups.

京都大学 / 0048 / 新制・論文博士 / 博士(理学) / 乙第12814号 / 論理博第1540号 / 新制||理||1577(附属図書館) / 31301 / (主査)准教授 半谷 吾郎, 教授 湯本 貴和, 教授 高田 昌彦 / 学位規則第4条第2項該当 / Doctor of Science / Kyoto University / DFAM

Establishing baseline activity budgets for zoo-housed captive animals can be important in tracking behavior changes that may indicate medical or other concerns, as well as assessing overall welfare and the need for implementation of interventions such as increased amounts of enrichment. This study sought to calculate activity budgets for the current spider monkeys residing at the Central Florida Zoo, a father-daughter pair of Ateles geoffroyi. Having a baseline activity budget is also valuable because major changes in behavior may accompany the upcoming introduction of new individuals to this particular group of spider monkeys. BORIS behavior coding software was used to log behavior continuously over 58.3 hours of observation. The individuals in this zoo setting spent significantly more time stationary (resting or still and awake) and less time engaged in feeding behavior than wild spider monkeys. However, they spent as much or more of their time moving than Ateles species in natural settings. Temperature and exhibit renovation had minimal to no observed effects on activity budgets. Human presence usually has the effect of increasing activity and vigilance of animals while decreasing resting time, but on busier days at the zoo, one subject (a pet-reared male spider monkey) spent more time resting and less time moving than when there were fewer zoo visitors. No aggression was observed, but affiliative social behavior like allogrooming and embracing was observed infrequently. The study animals appeared to lack the bimodal pattern of activity (with activity peaking early and late in the day) common in wild spider monkeys, a finding that is consistent with activity budgets of other spider monkeys that are frequently exposed to humans. Time of day affected activity budgets to a small degree; the monkeys became more active later in the day and spent more time resting in the morning.

Com Alouatta (bugios) as primeiras translocações não apresentaram monitoramento e quando começaram a ser feitos, duraram apenas um ano. Os resultados destes períodos curtos não permitem a avaliação de todas as condições sazonais do lugar da soltura. O objetivo deste estudo foi avaliar, ao longo de cinco anos, a translocação de um casal de bugios-pretos (Alouatta caraya) e o grupo formado a partir desta translocação, no campus da USP em Ribeirão Preto, SP. O casal de bugios-pretos foi translocado em novembro de 2009. Foram avaliados os nascimentos e o orçamento de atividades do casal e do grupo, de janeiro a dezembro dos anos de 2010, 2012, 2013 e 2014 (quatro dias por mês, com média de 580 horas de observação por ano); como também, o orçamento de atividades e a posição em relação à mãe e à irmã mais velha, dos segundo (Inf-2) e terceiro (Inf-3) filhotes do casal, do nascimento ao 12° mês de vida (ago/2012 - jul/2013 e ago/2013 - jul/2014, respectivamente). As categorias avaliadas para o orçamento de atividades foram: Agarrado, Descanso, Locomoção, Alimentação, Brincadeira e Social; e para posição em relação à mãe e à irmã mais velha foram: Agarrado ao ventre, Agarrado ao dorso, Encostado, Ao alcance do braço e Distante; ambos registrados pelo método de Varredura a cada 20 minutos. As análises estatísticas foram realizadas pelo Modelo Misto Linear Generalizado (GLMM). Entre maio e junho de 2013, tentamos suplementar o grupo com uma fêmea não aparentada (FNA), que permaneceu em um cativeiro na área do grupo. A aproximação e as interações sociais entre os indivíduos do grupo e a FNA foram registradas pelo método de Todas as Ocorrências. Também relatamos um encontro entre o grupo de estudo e o outro grupo residente no campus. Durante o período de estudo foram registrados quatro nascimentos, concentrados na estação seca. Os segundo e terceiro infantes do casal apresentaram orçamento de atividades semelhante durante o primeiro ano de vida. Porém, apresentaram diferenças na posição em relação à mãe e à irmã mais velha, onde Inf-3 passou mais tempo próximo a irmã mais velha. Os infantes também apresentaram diferenças entre as díades de interação social, Inf-2 foi catado apenas pela mãe e Inf-3 foi catado pela mãe e pela irmã. Em relação ao tempo de soltura do casal, houve um primeiro período de exploração, caracterizado por maior tempo em locomoção e um segundo período, caracterizado por um padrão no orçamento de atividades que se repetiu ao longo dos anos. O grupo de estudo e o outro grupo residente do campus, se encontraram no final do quinto ano após a soltura do casal. Houve confronto físico e, a partir deste encontro, o grupo de estudo passou a vocalizar todas as manhãs. No início da familiarização da FNA com o grupo, o macho adulto e os imaturos, foram os indivíduos que mais se aproximaram da FNA e realizaram algumas interações afilitiavas. Porém, a fêmea adulta foi quem ficou maior tempo em contato visual com a FNA e quem iniciou as interações agonísticas, em seguida, também realizadas pelo macho adulto. A FNA não permaneceu com o grupo. Desta forma, verificamos que o casal se adaptou às características da área de soltura e atingiu êxito reprodutivo, como também êxito no desenvolvimento dos infantes. Além disso, o encontro entre os grupos tornou real a possibilidade de mistura gênica entre eles. Assim, concluímos o êxito da translocação do casal. Apesar da FNA não ter permanecido com o grupo, este estudo descreveu pela primeira vez, as interações entre um grupo coeso de vida livre e uma fêmea não aparentada cativa, servindo de experiência para tentativas futuras. / Monitoring after translocation must be part of any project. After the first translocations that have happened with Alouatta (howler monkeys), monitoring was not done and when they began, lasted for only a year. The results obtained in this short period of time do not allow an evaluation of all seasonal conditions of the release place. The aim of this study was to evaluate, during a five-year period, the translocation of a black howler monkey couple (Alouatta caraya) and the group resulted from this translocation in USP campus in Ribeirão Preto, SP. The black howler monkey couple was translocated in November, 2009. Birth rates and activity budget of the couple and the group were evaluated from January to December of 2010, 2012, 2013,and 2014 (four days a month in an average of 580 hours a year), as well as the activity budget and the position relating to the mother and the older sister of the second (Inf-2) and the third (Inf-3) babies of the couple, from birth to their 12th month old (Aug/2012 Jul/2013 and Aug/2013 Jul/2014, respectively). The categories that were evaluated as Activity Budget were: Clinging, Rest, Moving, Feeding, Play and Social. As for the positions relating to the mother and older sister were: Abdominal Clinging, Back Clinging, Leaning, Arms Reach and Distant; both records were made by Scan Method every 20 minutes. Statistical analyses were done by Generalized Linear Mixed Models (GLMM). Between May and June, 2013, we tried to assemble a non-related female (NRF) that was kept in captivity in the group area. The approach and social interactions between the group individuals and the NRF were registered by the All Occurrence Sampling Method. We also related an encounter between the study group and another group from the campus. During the study period we registered four births during the dry period. The second and third babies showed a similar activity budget during their first year of life. However they both showed differences in the position relating to their mother and older sister in which Inf-3 spent more time near the older sister. Babies have also shown differences in the social interactions dyads. Inf-2 was groomed by the mother only and Inf-3 by the mother and the older sister. After the couples release, there was a period of exploration first which was characterized by a lot of moving and another period with a pattern in the activity budget that was repeated along the following years. The study group and the preexisting group from the campus found each other at the end of the fifth year after the couples release. There was physical confrontation and after that, the group vocalized every morning. During the begging of the familiarization of the NRF with the group, the adult male and the young were the ones who approached more and have some affiliative interactions. Although it was the female who kept visual contact for longer periods with NRF and then started agonistic interactions towards NRF, which were followed by the adult male. NRF did not stay with the group. Thus, we confirmed that the couple has adapted to the characteristics of the release area and reached reproductive success as well as the babies development achievement. Besides, the meeting of the two groups made real the possibility of genetic crossing between them. So we came to the conclusion that the couples translocation was a success. Although NRF did not remain with the group, this study has described, for the first time, interaction between a free cohesive group and a non-related captive female, providing information for future attempts.

A eficiência dos macacos-prego (gênero Sapajus) em uma ampla variedade de ambientes é resultado de sua flexibilidade, oportunismo e adaptabilidade. Esses primatas demonstram padrões de forrageio complexos, exploram manualmente vários estratos do habitat à procura de presas escondidas e apresentam técnicas de forrageio distintas, mostrando-se eficientes no uso de ferramentas para a obtenção de alimento. Embora poucos estudos abordem primatas não-humanos que vivem em manguezais, sabe-se que neste tipo de habitat existem registros do uso de ferramentas de quebra para acessar recursos animais encapsulados. A presente pesquisa é pioneira no estudo da ecologia e do uso de ferramentas em macacos-prego que habitam ambientes fragmentados, com variações sazonais de maré e de recursos alimentares. Os objetivos deste trabalho foram (1) investigar o orçamento de atividade e a dieta de um grupo de macacos-prego (S. libidinosus) residentes em manguezal, avaliando a influência dos fatores ambientais e da disponibilidade de recursos e (2) analisar, sob a perspectiva das hipóteses da necessidade e da oportunidade o uso de ferramentas por esse grupo, estimando a densidade dos sítios de quebra e sua frequência de uso. O estudo foi realizado no fragmento de manguezal Morro do Boi (MB), localizado nos Pequenos Lençóis Maranhenses (Barreirinhas), litoral leste do Maranhão, entre setembro de 2011 e março de 2013. Os resultados mostraram que a oferta de alimento encapsulado (caranguejo) no MB não sofreu grande variação ao longo do período da pesquisa e seguiu o padrão encontrado para os manguezais brasileiros situados na zona equatorial, enquanto que a oferta dos recursos vegetais (flores) foi influenciada pelo regime de chuvas e umidade, apresentando-se maior no período chuvoso. O orçamento de atividade foi semelhante ao de algumas populações de macacos-prego selvagens, embora a pequena e fragmentada área de vida e a alta de densidade de indivíduos possam ter influenciado os padrões de forrageio e deslocamento, que se apresentaram diferentes de populações em condições ecológicas e demográficas distintas. O uso do solo no MB apesar de ter sido mais frequente que o de populações de floresta úmida foi inferior ao dos macacos-prego do Cerrado/Caatinga, podendo ser um reflexo de fatores como a variação das marés, que limita o tempo de uso desses estratos para o forrageio e o consumo de itens encapsulados com ferramentas de quebra. A dieta se assemelhou a de primatas que vivem em manguezal, com o predomínio de recursos vegetais do mangue. A inclusão de crustáceos e moluscos se deu de forma oportunista, na maré baixa, sendo o caranguejo o item com maior frequência nos sítios de quebra. Os demais recursos por serem menores e menos energéticos do que os caranguejos tiveram maior frequência de quebra no período seco, se apresentando como recursos alternativos utilizados para complementar a dieta. As estratégias de forrageio apresentadas pelos indivíduos do MB confirmam a flexibilidade e adaptabilidade dos macacos-prego e contribuem para o aumento do conhecimento da espécie em um ambiente com limitações de espaço e condições ecológicas sazonais / The efficiency of capuchin monkeys (genus Sapajus) in a wide variety of environments is the result of their flexibility, adaptability and opportunism. These primates demonstrate complex patterns of foraging; explore various strata manually in order to look for hidden prey and also they have distinct foraging techniques, showing efficiency at using tools to obtain food. Although few studies approach non-human primates that live in mangroves, it is known in this habitat many records of tool use cracking to access encapsulated animals. This research is pioneer due to the lack of information on the ecology and tool use in capuchin monkeys that inhabit fragmented environments with tidal and seasonal variations of food resources. Our aims were (1) investigating the activity budget and diet of a capuchin monkeys (S. libidinosus) group which live in mangrove estimating whether environmental factors and availability of resources influence in the activity budget and diet and (2) analyzing, from the perspective of the necessity and opportunity hypotheses, the behavioral expression about tool use by this group, estimating the density of tool use in the sites and the frequency of using. The study was conducted at Morro do Boi (MB) fragments mangrove located on the Lençóis Maranhenses (Barreirinhas), east coast of Maranhão, between September 2011 and March 2013. The results showed that the supply of encapsulated food (crab) in MB did not have a significant variation over the study period and followed the pattern found in the Brazilian mangroves located in the equatorial zone, while the supply of plant resources (flowers) was influenced by rainfall and humidity, being higher in the rainy season. The found activity budget was similar to that one in some populations of wild capuchin monkeys, although small and fragmented home range and high density of individuals may have influenced patterns of foraging and locomotion, which showed different of populations in distinct ecological and demographic conditions. Although the ground use in MB was more common than in populations of rainforest, it was lower than in Cerrado/Caatinga areas, it may be a reflection of factors such as tidal range, which limits the use of these substrates for foraging and eating encapsulated items with cracking tools. The diet was similar to that one from other primates that live in mangroves, with the predominance of the mangrove plant resources. Consumption of crustaceans and mollusks occurred opportunistically after the low tide, and the crab was the most frequently consummated item in the sites. Regarding to the other resources, the fact of being smaller and less energetic than the crabs they had a higher frequency of breaks in the dry season, presenting themselves as alternative resources used to supplement the diet. The foraging strategies presented by individuals in MB confirm the flexibility and adaptability of capuchin monkeys and contribute to the increasing knowledge of the species in an environment with limited space and seasonal ecological conditions

A eficiência dos macacos-prego (gênero Sapajus) em uma ampla variedade de ambientes é resultado de sua flexibilidade, oportunismo e adaptabilidade. Esses primatas demonstram padrões de forrageio complexos, exploram manualmente vários estratos do habitat à procura de presas escondidas e apresentam técnicas de forrageio distintas, mostrando-se eficientes no uso de ferramentas para a obtenção de alimento. Embora poucos estudos abordem primatas não-humanos que vivem em manguezais, sabe-se que neste tipo de habitat existem registros do uso de ferramentas de quebra para acessar recursos animais encapsulados. A presente pesquisa é pioneira no estudo da ecologia e do uso de ferramentas em macacos-prego que habitam ambientes fragmentados, com variações sazonais de maré e de recursos alimentares. Os objetivos deste trabalho foram (1) investigar o orçamento de atividade e a dieta de um grupo de macacos-prego (S. libidinosus) residentes em manguezal, avaliando a influência dos fatores ambientais e da disponibilidade de recursos e (2) analisar, sob a perspectiva das hipóteses da necessidade e da oportunidade o uso de ferramentas por esse grupo, estimando a densidade dos sítios de quebra e sua frequência de uso. O estudo foi realizado no fragmento de manguezal Morro do Boi (MB), localizado nos Pequenos Lençóis Maranhenses (Barreirinhas), litoral leste do Maranhão, entre setembro de 2011 e março de 2013. Os resultados mostraram que a oferta de alimento encapsulado (caranguejo) no MB não sofreu grande variação ao longo do período da pesquisa e seguiu o padrão encontrado para os manguezais brasileiros situados na zona equatorial, enquanto que a oferta dos recursos vegetais (flores) foi influenciada pelo regime de chuvas e umidade, apresentando-se maior no período chuvoso. O orçamento de atividade foi semelhante ao de algumas populações de macacos-prego selvagens, embora a pequena e fragmentada área de vida e a alta de densidade de indivíduos possam ter influenciado os padrões de forrageio e deslocamento, que se apresentaram diferentes de populações em condições ecológicas e demográficas distintas. O uso do solo no MB apesar de ter sido mais frequente que o de populações de floresta úmida foi inferior ao dos macacos-prego do Cerrado/Caatinga, podendo ser um reflexo de fatores como a variação das marés, que limita o tempo de uso desses estratos para o forrageio e o consumo de itens encapsulados com ferramentas de quebra. A dieta se assemelhou a de primatas que vivem em manguezal, com o predomínio de recursos vegetais do mangue. A inclusão de crustáceos e moluscos se deu de forma oportunista, na maré baixa, sendo o caranguejo o item com maior frequência nos sítios de quebra. Os demais recursos por serem menores e menos energéticos do que os caranguejos tiveram maior frequência de quebra no período seco, se apresentando como recursos alternativos utilizados para complementar a dieta. As estratégias de forrageio apresentadas pelos indivíduos do MB confirmam a flexibilidade e adaptabilidade dos macacos-prego e contribuem para o aumento do conhecimento da espécie em um ambiente com limitações de espaço e condições ecológicas sazonais / The efficiency of capuchin monkeys (genus Sapajus) in a wide variety of environments is the result of their flexibility, adaptability and opportunism. These primates demonstrate complex patterns of foraging; explore various strata manually in order to look for hidden prey and also they have distinct foraging techniques, showing efficiency at using tools to obtain food. Although few studies approach non-human primates that live in mangroves, it is known in this habitat many records of tool use cracking to access encapsulated animals. This research is pioneer due to the lack of information on the ecology and tool use in capuchin monkeys that inhabit fragmented environments with tidal and seasonal variations of food resources. Our aims were (1) investigating the activity budget and diet of a capuchin monkeys (S. libidinosus) group which live in mangrove estimating whether environmental factors and availability of resources influence in the activity budget and diet and (2) analyzing, from the perspective of the necessity and opportunity hypotheses, the behavioral expression about tool use by this group, estimating the density of tool use in the sites and the frequency of using. The study was conducted at Morro do Boi (MB) fragments mangrove located on the Lençóis Maranhenses (Barreirinhas), east coast of Maranhão, between September 2011 and March 2013. The results showed that the supply of encapsulated food (crab) in MB did not have a significant variation over the study period and followed the pattern found in the Brazilian mangroves located in the equatorial zone, while the supply of plant resources (flowers) was influenced by rainfall and humidity, being higher in the rainy season. The found activity budget was similar to that one in some populations of wild capuchin monkeys, although small and fragmented home range and high density of individuals may have influenced patterns of foraging and locomotion, which showed different of populations in distinct ecological and demographic conditions. Although the ground use in MB was more common than in populations of rainforest, it was lower than in Cerrado/Caatinga areas, it may be a reflection of factors such as tidal range, which limits the use of these substrates for foraging and eating encapsulated items with cracking tools. The diet was similar to that one from other primates that live in mangroves, with the predominance of the mangrove plant resources. Consumption of crustaceans and mollusks occurred opportunistically after the low tide, and the crab was the most frequently consummated item in the sites. Regarding to the other resources, the fact of being smaller and less energetic than the crabs they had a higher frequency of breaks in the dry season, presenting themselves as alternative resources used to supplement the diet. The foraging strategies presented by individuals in MB confirm the flexibility and adaptability of capuchin monkeys and contribute to the increasing knowledge of the species in an environment with limited space and seasonal ecological conditions

<p>When breeding wild species in captivity, the animals may gradually become more adapted to captivity and therefore less suited for reintroduction which is the ultimate goal for some species. This study measured the activity budget of European bison (<em>Bison bonasus</em>) in six enclosures in Sweden with the aim to find out how the characteristics of the enclosures – with and without pasture - influenced the activity budget. The results show that there were significant differences in the activity budget, i.e. the activity was higher in the enclosures with pasture than in enclosures with barren ground. However, since barren enclosures were smaller than naturalistic, it was not possible to exclude the effect of size. Judged from observations of bison in the wild, there seems to be a direct correlation between food availability and ranging, indicating that enclosure characteristics affect activity more than size. The bison foraged differently in the two enclosure categories, but the total amount of time spent on feeding did not differ. A feeding enrichment experiment showed to have more positive effects in the barren enclosures than in the naturalistic ones, as the amount of time of inactivity decreased in the former. Since the genetic characteristics of all Swedish bison are very similar, the differences between the two enclosure groups indicate that the animals still have the ability to respond appropriately to improved environmental quality. Hence the next step in the assessment of the suitability of these bison for release would be to study them during an acclimatisation program.</p>

When breeding wild species in captivity, the animals may gradually become more adapted to captivity and therefore less suited for reintroduction which is the ultimate goal for some species. This study measured the activity budget of European bison (Bison bonasus) in six enclosures in Sweden with the aim to find out how the characteristics of the enclosures – with and without pasture - influenced the activity budget. The results show that there were significant differences in the activity budget, i.e. the activity was higher in the enclosures with pasture than in enclosures with barren ground. However, since barren enclosures were smaller than naturalistic, it was not possible to exclude the effect of size. Judged from observations of bison in the wild, there seems to be a direct correlation between food availability and ranging, indicating that enclosure characteristics affect activity more than size. The bison foraged differently in the two enclosure categories, but the total amount of time spent on feeding did not differ. A feeding enrichment experiment showed to have more positive effects in the barren enclosures than in the naturalistic ones, as the amount of time of inactivity decreased in the former. Since the genetic characteristics of all Swedish bison are very similar, the differences between the two enclosure groups indicate that the animals still have the ability to respond appropriately to improved environmental quality. Hence the next step in the assessment of the suitability of these bison for release would be to study them during an acclimatisation program.

<p>A central theme in animal ecology is the study of the relationship between ecology and behavior. This dissertation demonstrates how ecological parameters, particularly food and weather variables, correlate with ranging, activity budget, and diet in Udzungwa red colobus monkeys (URC, <italic>Procolobus gordonorum</italic>), endemic to the Udzungwa Mountains, Tanzania. </p><p> From April 2009 - March 2010, four URC groups were habituated and studied in Mwanihana and Magombera Forests. During all-day follows, ranging, activity budget, and diet data were collected using GPS units and ten-minute scan samples of sustained activities. Food characteristics were assessed using transect and phenology surveys. Preliminary nutritional analyses were conducted on species-specific parts fed upon during October. I designed and employed novel methods for estimating ranging statistics which were compared with conventional methods.</p><p> Home range sizes were relatively small (8.8 - 20.8 ha). Home range size may relate to food species diversity and feeding selectivity for species-specific food parts. Variability in dietary composition was partly explained by plant phenology, forest composition, and selectivity differences among groups. URC primarily fed upon young leaves with higher fat content. Some non-nutritive items eaten may function as detoxifying agents. Data suggest that the URC dietary strategy involves nutrient balancing (i.e. maximizing energetic intake and nutrient acquisition while avoiding high concentrations of particular plant secondary compounds).</p><p> Mean daily travel distance (DTD) was 970 m, longer than in other red colobus taxa. DTD was shorter in October and November when temperatures were warmer and a high abundance of young growth became available. Young growth comprised the majority of all groups' diets in each sample period. When young growth abundances were highest, Magombera groups traveled shorter distances. One group's DTD did not differ seasonally and was significantly longer compared to other groups. This group may have traveled longer distances and spent less time resting in order to consume young growth in a habitat with lower young growth abundances. A correlation between time spent resting and temperature suggests behavioral prevention of hyperthermia. URC energetic strategies may involve balancing thermoregulation with maximizing energy intake. Conservation recommendations are discussed and include stricter forest protection.</p> / Dissertation