A controversy dating from the appearance of Altum's book, Der Vogel und sein Leben, 1868 (Mayr, 1935) is that of the biological function or functions of the territorial behavior in birds. However, attention was not focused upon this problem until the advent of Howard's book, Territory in Bird Life, published in 1920. In a general review of the problem Hinde (1956) discussed several functions of the territory and presented evidence both for and against their importance. The more important of these presumed functions are; (1) limitation of population density; (2) facilitation of pair formation and maintenance of the pair bond; (3) reduction in interference with reproductive activities by other members of the species; (4) provision of an adequate food supply for rearing the young; (5) reduction of loss to predators; (6) reduction of time spent in aggression; and (7) prevention of epidemics.

The subfamily Cyclidiinae is a small macroheteroceran group, which is endemic to the Oriental region and comprising 13 species in 2 genera, e.g. Cyclidia Guenée, 1857 and Mimozethes Warren, 1901. The larvae of the subfamily are specialists on Alangium (Cornaceae) and exhibit conspicuous colouration and gregariousness that may possibly function as aposematism. Historically this subfamily was inconsistently treated as either a separate family from Drepanidae, or lumped as a subordination of Drepanidae. Although both the two recent molecular phylogenetic hypotheses support the monophyly of Drepanidae, the morphological characters supporting the monophyletic status of Cyclidiinae and Drepanidae, however, have never been examined using modern methods. In the present study I investigated the phylogenetic relationships of Cyclidiinae based on morphological characters obtained from all the described species (13 species, including 4 subspecies) and the representatives of Drepaninae, Thyatirinae and Hypsidia. Cimeliidae and Doidae were chosen to be the outgroup taxa. In total 72 adult characters (32 binary, 40 multistate) were obtained and analyzed using Maximum Parsimony based on two character inclusion schemes (including or excluding wing pattern characters). The results showed the monophyletic status of the two Cyclidiinae genera, each subfamily of Drepanidae and the entire Drepanidae were recovered no matter which character inclusion scheme was adopted. The sistergroup of Cyclidiinae is confirmed to be ((Thyatirinae + Hypsidia) + Drepaninae). Although including wing pattern characters in the analysis does not significantly increase phylogenetic resolution within the Cyclidiinae, this scheme has great influence on the internal relationship of the subfamily. Meanwhile the present study reveals that most synapomorphies of Cyclidiinae proposed by previous studies are in fact plesiomorphic.

Orientador: Marcos César de Oliveira Santos / Banca: Marco Aurélio Pizo Ferreira / Banca: Olavo Nardy / Resumo: A choca-do-planalto (Thamnophilus pelzelni Hellmayr, 1924) é um Thamnophilidae insetívoro que ocorre da área central do Brasil até o Nordeste. É considerada uma espécie comum e não está ameaçada de extinção. Informações sobre aspectos da área de vida são escassas, e assim torna-se necessário investir em esforços de pesquisas. O objetivo deste estudo foi estimar o tamanho da área de vida da choca-do-planalto e comparar o tamanho da área de vida entre o período chuvoso não reprodutivo, período seco não reprodutivo e período chuvoso reprodutivo. O estudo foi realizado dentro de uma grade de 30 ha na Estação Ecológica de Jataí (21°30' - 21°40'S e 47°40' - 47°50'W), município de Luiz Antônio, SP, entre fevereiro de 2009 e janeiro de 2010. Para a demarcação das áreas de vida, os indivíduos de T. pelzelni foram capturados com redes de neblina e marcados com uma anilha padrão CEMAVE e duas anilhas coloridas. As trilhas da grade eram percorridas e os indivíduos detectados tinham sua sequência de anilhas identificada com a ajuda de um binóculo (10x50) e a localização era determinada com ajuda de um GPS. Para estimar a área de vida foi utilizado o Minimo Poligono Convexo (MPC) com probabilidade de 100% e o Kernel Fixo (KF) 95% e 50% referentes, respectivamente, a área de vida e área core. Para comparar o tamanho da área de vida nos três períodos amostrados foi feito análise de variância para medidas repetidas (RM-ANOVA) e o teste de Tukey foi usado para identificar qual média diferiu significativamente entre si. O tamanho da área de vida calculada pelo MPC variou de 2,7 a 4,8 ha, com média de 3,3 ± 0,6 ha Pelo estimador de KF 95% a área de vida variou de 3,4 a 7,0 ha, com média de 4,7 ±1,1 ha. A área core (KF 50%) apresentou média de 1,1 ± 0,3 ha. Os tamanhos das áreas de vida variaram significativamente entre os três períodos... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The Planalto Slaty-Antshrike (Thamnophilus pelzelni Hellmayr, 1924) is an insectivore Thamnophilidae that occurs in the central area of Brazil to the northeast of the country. It is a common species and considered not threatened. Information about aspects of home range is scarce. The aim of this study was to estimate the home range of Planalto Slaty-Antshrike and compare the extent of home range among the non-reproductive rainy season, non-reproductive dry season and breeding rainy season. Data collection occurred in a grid of 30 ha in Jataí Ecological Station (21 ° 30 '- 21 ° 40'S and 47 ° 40' - 47 ° 50'W), municipality of Luiz Antônio, SP, between February 2009 and January 2010. Individuals of T. pelzelni were captured with mist nets and banded with a numbered aluminum leg band (pattern CEMAVE) and with two colored bands. Each track of the grid was traversed and in each contact, individuals detected had their sequence of washers identified with the aid of binoculars (10x50) and the location determined with the use of a GPS. The Minimum Convex Polygon (MCP) was applied with a probability of 100% and Fixed Kernel (FK) 95% and 50% concernig, respectively, the home range and core area. To compare the extent of home range in three sampling periods, analysis of variance was performed for repeated measures (RM-ANOVA), and Tukey test to identify which average differ significantly. The size of home range calculated by the MCP ranged from 2.7 to 4.8 hectares, with an average of 3.3 ± 0.6 ha. To apply the FK estimator at 95% of probability, the home range ranged from 3.4 to 7.0 ha, with a rough average of 4.7 ± 1.1 ha. The core area (FK 50%) resulted 1.1 ± 0.3 ha. The extent of the home ranges altered significantly between three sampling periods (MCP ˂ P 0.001; FK 95% P ˂ 0,001, 50% FK ˂ P 0.001). Tukey test exhibited that the home ranges were significantly larger during the dry... (Complete abstract click electronic access below) / Mestre

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.

Made available in DSpace on 2014-06-11T19:30:15Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-09-03Bitstream added on 2014-06-13T19:18:46Z : No. of bitstreams: 1 parruco_chf_me_rcla.pdf: 1581523 bytes, checksum: 9feae13a7e505dfe52f917856ec3df37 (MD5) / Universidade Estadual Paulista (UNESP) / A choca-do-planalto (Thamnophilus pelzelni Hellmayr, 1924) é um Thamnophilidae insetívoro que ocorre da área central do Brasil até o Nordeste. É considerada uma espécie comum e não está ameaçada de extinção. Informações sobre aspectos da área de vida são escassas, e assim torna-se necessário investir em esforços de pesquisas. O objetivo deste estudo foi estimar o tamanho da área de vida da choca-do-planalto e comparar o tamanho da área de vida entre o período chuvoso não reprodutivo, período seco não reprodutivo e período chuvoso reprodutivo. O estudo foi realizado dentro de uma grade de 30 ha na Estação Ecológica de Jataí (21°30’ - 21°40’S e 47°40’ - 47°50’W), município de Luiz Antônio, SP, entre fevereiro de 2009 e janeiro de 2010. Para a demarcação das áreas de vida, os indivíduos de T. pelzelni foram capturados com redes de neblina e marcados com uma anilha padrão CEMAVE e duas anilhas coloridas. As trilhas da grade eram percorridas e os indivíduos detectados tinham sua sequência de anilhas identificada com a ajuda de um binóculo (10x50) e a localização era determinada com ajuda de um GPS. Para estimar a área de vida foi utilizado o Minimo Poligono Convexo (MPC) com probabilidade de 100% e o Kernel Fixo (KF) 95% e 50% referentes, respectivamente, a área de vida e área core. Para comparar o tamanho da área de vida nos três períodos amostrados foi feito análise de variância para medidas repetidas (RM-ANOVA) e o teste de Tukey foi usado para identificar qual média diferiu significativamente entre si. O tamanho da área de vida calculada pelo MPC variou de 2,7 a 4,8 ha, com média de 3,3 ± 0,6 ha Pelo estimador de KF 95% a área de vida variou de 3,4 a 7,0 ha, com média de 4,7 ±1,1 ha. A área core (KF 50%) apresentou média de 1,1 ± 0,3 ha. Os tamanhos das áreas de vida variaram significativamente entre os três períodos... / The Planalto Slaty-Antshrike (Thamnophilus pelzelni Hellmayr, 1924) is an insectivore Thamnophilidae that occurs in the central area of Brazil to the northeast of the country. It is a common species and considered not threatened. Information about aspects of home range is scarce. The aim of this study was to estimate the home range of Planalto Slaty-Antshrike and compare the extent of home range among the non-reproductive rainy season, non-reproductive dry season and breeding rainy season. Data collection occurred in a grid of 30 ha in Jataí Ecological Station (21 ° 30 '- 21 ° 40'S and 47 ° 40' - 47 ° 50'W), municipality of Luiz Antônio, SP, between February 2009 and January 2010. Individuals of T. pelzelni were captured with mist nets and banded with a numbered aluminum leg band (pattern CEMAVE) and with two colored bands. Each track of the grid was traversed and in each contact, individuals detected had their sequence of washers identified with the aid of binoculars (10x50) and the location determined with the use of a GPS. The Minimum Convex Polygon (MCP) was applied with a probability of 100% and Fixed Kernel (FK) 95% and 50% concernig, respectively, the home range and core area. To compare the extent of home range in three sampling periods, analysis of variance was performed for repeated measures (RM-ANOVA), and Tukey test to identify which average differ significantly. The size of home range calculated by the MCP ranged from 2.7 to 4.8 hectares, with an average of 3.3 ± 0.6 ha. To apply the FK estimator at 95% of probability, the home range ranged from 3.4 to 7.0 ha, with a rough average of 4.7 ± 1.1 ha. The core area (FK 50%) resulted 1.1 ± 0.3 ha. The extent of the home ranges altered significantly between three sampling periods (MCP ˂ P 0.001; FK 95% P ˂ 0,001, 50% FK ˂ P 0.001). Tukey test exhibited that the home ranges were significantly larger during the dry... (Complete abstract click electronic access below)

The dear enemy effect is a widespread behavioral phenomenon that promotes selective pacifism in order to minimize costs of territorial defense. The dear enemy hypothesis predicts heightened aggression towards unfamiliar conspecifics compared to familiar neighbors where territorial boundaries are established. The purpose of this study was to test the dear enemy hypothesis in Neolamprologus multifasciatus, a social cichlid fish endemic to the shell beds of Lake Tanganyika. They establish breeding groups that control distinct territories, each governed by a dominant male. Territories can be very densely spaced, and conspecific border intrusions generally trigger aggressive responses from the focal group. The dominant males are responsible for the majority of territory defense. In this field experiment, 27 breeding groups were each given two treatments, each consisting of artificial introduction of an out-of-group dominant male. One male originated from an immediately neighboring group, the other from a distant group.  A downward-facing camera recorded group members’ aggressivity exhibited towards the experimentally presented male. The behavior was manually scored according to a behavior ethogram and analyzed with either linear mixed effects models or generalized linear mixed effects models. No clear dear enemy effect was detected within Neolamprologus multifasciatus. Several reasons are proposed for this result. Firstly, a contingent “ceiling effect” in terms of aggressive behavior imaginably deterred efforts of dear enemy detection. Conversely, perhaps negligible necessity of stranger-neighbor recognition within Neolamprologus multifasciatus has resulted in discriminatory behavior being absent. In conclusion, no dear enemy effect was detected and future research will address possible alternative explanations.

Orientador: Eliane Gonçalves de Freitas / Banca: Rosana Mattioli / Banca: Mateus José Rodrigues Paranhos da Costa / Resumo: Machos dominantes de Oreochromis niloticus defendem território no substrato, onde escavam ninhos para a reprodução. Alguns sistemas de criação de tilápia do Nilo utilizam tanques sem substrato, assim, testamos se a privação da construção de ninho aumenta a agressividade e interfere no sucesso de acasalamento dos machos dominantes. Foram utilizados dois grupos formados por 2 machos e 3 fêmeas: um com substrato (COM: n = 9), onde o aquário (~140L) continha uma camada de 3 cm de substrato de pedrisco, e um grupo sem substrato (SEM: n = 11) onde os animais foram privados da construção de ninho. Os animais permaneceram agrupados por 10 dias e o comportamento agonístico do macho dominante foi registrado através de quatro sessões de filmagens (20 min cada), sendo a primeira, 24 horas após o agrupamento e as outras três, a cada 72 horas. A agressividade foi inferida pela freqüência total de unidades de alta intensidade (frontal, lateral, paralelo e ondulação) emitidas pelo macho dominante para o submisso e para as fêmeas. A agressividade foi maior no grupo SEM (97.73 l 31.77. 80 min-1) do que no COM (61.75 l 13.24. 80 min-1; Mann-Withney, p = 0.008). Foram analisados a Taxa de Crescimento Específico (TCE) e o Índice Hepatossomático (IHS) dos dominantes como indicador de gasto energético. A TCE e o IHS foram menores para os dominantes que construíram ninhos (TCE: COM 0.86 l 0.44%.10 dia-1; SEM 1.48 l 0.52% .10 dia-1; teste t, p = 0.10; IHS: COM 1.39 l 0.42% .10 dia-1; SEM 2.16 l 0.82% .10 dia-1; teste t, p = 0.10), o que é indicativo de que os machos dominantes gastam energia escavando ninho, diminuindo a energia disponível para os ataques de alta intensidade. Além disso, foram registrados a latência e a porcentagem de desova, sendo esses similares nos grupos COM e SEM. O índice gonadossomático foi também analisado e maior nos dominantes... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Dominant males of Nile tilapia, Oreochromis niloticus, defend territory on substrates where they dig mating nests. Because some kinds of rearing systems of Nile tilapia use tanks with no substrate inside, our aim was to test whether nest digging privation increases aggressiveness in that species. As we have observed spawning in such conditions, we also tested the effect of nesting privation on dominant’s mating success. Two groups formed by 2 males and 3 females each were used: a substrate inside-group (INS; n = 9), whose glass aquaria (~140L) had a 3 cm-layer of gravel, and a non substrate-group (NOS; n = 11) where animals were unable to dig nests. Groups were kept by 10 days and the agonistic behavior of dominant male was video-recorded in 4 sessions (20 min each), the first after 24 hours from grouping and the other 3, every 72 hours. Aggressiveness was inferred by the total frequency of high aggression intensity units (nip, mouthfight, lateral fight and undulation) given by the dominant male in contests with females and subordinate males. The aggressiveness was higher in the NOS (97.73 l 31.77. 80 min-1) than in the INS group (61.75 l 13.24. 80 min-1; Mann-Withney, p = 0.008). We analyzed the Specific Growth Rate and Hepatosomatic Index of dominants as indicators of energy expenditure, whose were higher for dominants that dig nests (SGR: INS 0.86 l 0.44% .10 day-1; NOS 1.48 l 0.52% .10 day- 1; t test, p = 0.10; HIS: INS 1.39 l 0.42% .10 day-1; NOS 2.16 l 0.82% .10 day-1; t test, p = 0.10). Dominant males seem to spend much energy digging nests and deviate energy from high aggressive contests. Moreover, we registered the latency to spawn and the percentage of spawning, whose was similar among INS and NOS groups. Gonadosomatic Index was also analyzed and it was higher in dominant... (Complete abstract click electronic access below) / Mestre

Background noise is ubiquitous and can impair acoustic communication and influence signaling behavior in animals. Despite evidence demonstrating myriad effects of anthropogenic noise on animal communication, precisely how natural background noise influences communication and behavior remains unclear. Yet, natural sources of background noise, such as rushing rivers or crashing ocean surf, share similar power spectra to sources of anthropogenic noise and can occur at high amplitudes, potentially masking acoustic signals. To investigate the effects of water-generated noise on songbird behavior, we experimentally broadcast landscape-level playbacks of ocean surf and river noise in coastal California, USA, and riparian habitat in Idaho, USA, respectively. In Chapter 1, we conducted a conspecific playback experiment examining how territorial defense behaviors of lazuli buntings (Passerina amoena) and spotted towhees (Pipilo maculatus) vary in response to broadcast water noise. We also incorporated cicada noise from a serendipitous Okanagana spp. emergence as a biotic source influencing lazuli bunting behavior. Both species produce songs that share substantial spectral overlap with low-frequency, water-generated noise, and lazuli bunting song shares an additional high-frequency overlap with cicada calls. Thus, there is potential for background acoustic conditions to mask conspecific signals. We found that detection and discrimination of conspecific playback occurred more slowly for both species as sound level increased. Lazuli buntings also exhibited divergent flight behaviors in response to high- and low-frequency acoustic sources, both dependent and independent of sound level. In Chapter 2, we investigated how amplitude and frequency of water-generated noise influences spectral and temporal song characteristics in six songbird species. We recorded individuals defending territories across 37 sites, with each site representing one of four acoustic environments: naturally quiet ‘controls’, naturally noisy ‘positive controls’ adjacent to the ocean or a whitewater river, ‘phantom’ playback sites with continuous broadcast of low-frequency water noise, and ‘shifted’ playback sites with continuous broadcast of high-frequency water noise. We predicted that all individuals exposed to ‘positive control’, ‘phantom’, or ‘shifted’ noise would adjust song structure, but the magnitude of signal modification would be larger in noisier locations and the type of modification would depend on the spectral profile of the acoustic environment. No two species altered songs in precisely the same way. However, song structure of all six species varied with amplitude and/or frequency of background noise. Together our results demonstrate that natural noise can impair agonistic behaviors and influence vocal structure. These findings suggest that the natural acoustic environment shapes acoustic communication, highlighting natural soundscapes as an under-appreciated axis of the environment.

This dissertation aims to understand the role of territoriality in peer-to-peer (P2P) accommodation guest experience by answering four questions: (1) How do P2P accommodation guests feel about staying in P2P accommodation rentals as a territorial complexity? (2) What factors influence P2P accommodation guests’ perceptions of being in P2P accommodation rentals? (3) What kinds of territorial behaviors do guests experience from hosts in P2P accommodation rentals? How does host territoriality affect P2P accommodation guest experiences? (4) Do guests engage in territoriality in P2P accommodation rentals? If so, what territorial behaviors do guests use? A convergent mixed-methods design was used to answer these questions based on two studies: a qualitative study intended to develop an overall understanding of territoriality in P2P accommodation guest experiences (Study 1); and a scale development and validation study intended to develop a scale of perceived host territoriality in P2P accommodation settings (Study 2). Study 1 followed the procedures of interpretative phenomenological analysis, including semi-structured interviews with 13 P2P accommodation guests. Interview transcripts were analyzed to identify themes related to territoriality in P2P accommodation guest experiences. Results of Study 1 show that P2P accommodation guests possessed two territorial senses while staying in a shared rental: a sense of being in others’ territory and a sense of being in their own territory. Feelings associated with staying in others’ territory vs. their own territory were identified. Eight sets of factors were found to influence territorial senses, including home amenities and facilities, personal items/décor items, length of stay/use, physical presence of the host, entire rental vs. private rental, disturbance from others, hospitableness of the host, and travel companionship. Multiple factors that enhanced P2P accommodation guests’ sense of being in others’ territory were related to host territoriality. A closer examination of host territoriality revealed six types of host territoriality: personalization of the rental, house rules, accessibility, intrusion, hands-on hosting, and service failure. Guests’ reactions toward host territoriality fell into four categories: adaption, assertive defense, appeal, and avoidance. The impacts of host territoriality on guests’ evaluations of hosts, evaluations of their P2P accommodation experiences, and future use of P2P accommodations varied depending on guests’ reactions and attributions of host territoriality. P2P accommodation guests were also found to need their own space in P2P accommodation rentals. Influenced by this need and a sense of being in their own territory, P2P accommodation guests sometimes also engaged in territoriality to construct, communicate, and defend their territories. Guests’ territorial behaviors included personalization of the rental, exploration of the rental, giving instructions to others, and defending against territorial intrusions. Following an eight-step scale development procedure, Study 2 developed and validated a scale of perceived host territoriality in P2P accommodations. An initial list of scale items was generated from an online survey with open-ended questions (N = 116), independent coding of survey responses, and examples identified in Study 1. An expert panel (N = 5) and a panel of P2P accommodation guests (N = 26) were hired to assess the content validity of the original scale. A pilot study was conducted for initial scale validation (N = 93), after which the wording of scale items was modified. An online survey for scale purification and refinement was then conducted (N = 911). The dataset was split into a developmental sample and a validation sample to conduct exploratory factor analysis and confirmatory factor analysis, respectively. After scale purification, a second dataset was collected to validate the scale (N = 603). The final version of the scale included 18 items and four dimensions: Accessibility, House Rules, Signs of Ownership, and Intrusion. Known-group comparisons and criterion-related validity assessment confirmed the validity of the scale. Specifically, P2P accommodation guests who stayed in a private-room rental reported higher levels of host territoriality than those staying in an entire rental. Experiences of host territoriality were negatively correlated with perceived control, perceived self-efficacy, and personal sense of power among P2P accommodation guests. The newly developed scale was used to examine the impact of perceived host territoriality on perceived warmth and competence of P2P accommodation hosts, guests’ experience satisfaction, and guests’ behavioral intentions via a second-order structural equation model. Perceived host territoriality was negatively associated with perceived warmth and competence of P2P accommodation hosts, satisfaction with the P2P accommodation experience, and intention to reuse/recommend a P2P accommodation rental. However, dimensions of host territoriality had varying impacts on guest experience; host territoriality via signs of ownership and house rules positively influenced P2P accommodation guest experiences. A conceptual framework of territoriality in P2P accommodation guest experiences was proposed based on the findings of this dissertation, describing relationships among territorial senses, factors influencing territorial senses, host territoriality, guest reactions to host territoriality, and guest territoriality. Theoretical implications of these results on P2P accommodation research, human territory and territoriality research, and tourism and hospitality research were discussed, followed by implications regarding P2P accommodation platforms, hosts, and guests as well as management of guest experiences in other hospitality service encounters. / Business Administration/Interdisciplinary

O comportamento territorial é exibido por animais que competem por recursos dentro de uma área específica defendida. Ao excluir competidores potenciais desta área através de comportamentos agressivos, os indivíduos territoriais garantem acesso prioritário aos recursos essenciais para sua sobrevivência e reprodução. Em anfíbios anuros, a territorialidade tem sido relacionada principalmente com espécies de reprodução prolongada, cujos sítios reprodutivos estão disponíveis durante todo o ano. O presente trabalho foi realizado em um trecho de riacho na Floresta da Tijuca, Rio de Janeiro. Foram realizadas quatro visitas consecutivas a área de amostragem em cada mês (abril/2009 à agosto/2010). O objetivo foi responder questões sobre a territorialidade dos indivíduos da espécie Hylodes nasus: (área de vida, fidelidade ao sítio, comportamentos agonísticos e combates físicos). As áreas de vida dos machos apresentaram relação significativa com o número de recapturas. O tamanho da área de vida das fêmeas foi ligeiramente maior do que dos machos. Os machos apresentaram maior fidelidade do que as fêmeas. A fidelidade apresentou resultado significativo com o CRC e a massa corporal dos indivíduos. Foram observadas 50 interações agonísticas entre machos, sendo exibidos 11 comportamentos agressivos. Foram observados 19 combates físicos, sendo os machos envolvidos classificados como residente, intruso, vencedor ou perdedor. Todas as disputas foram vencidas por indivíduos residentes. Informações a respeito da influência de fatores ambientais sobre a população de H. nasus, aspectos da estrutura populacional e descrição do microhábitat também são fornecidos. / The territorial behavior is exhibited by animals that compete for resources within a specific defended area. By excluding potential competitors in this area through aggressive behavior, territorialist individuals ensure priority access to essential resources for their survival and reproduction. In anuran amphibians, territoriality has been mainly related to prolonged-breeding species, whose breeding sites are available throughout the year. This study was conducted in a portion of the river in the Tijuca Forest, Rio de Janeiro. There were four consecutive visits to the sampling area in each month (April/2009 to August/2010). The objective was to answer questions about the territorial behavior of Hylodes nasus (home range, site fidelity, agonistic behaviors and physical fighting). The males home range showed a significant relation with number of recapture. The home range estimated for females was slightly larger than males. Males have higher site fidelity than females. The site fidelity showed a significant relation with individuals' SVL and body mass. There were observed 50 agonistic encounters between males, showing 11 aggressive behaviors. There were observed 19 physical fights with males being classified as resident, intruder, winner or loser. All contests were won by resident individuals. Information about the influence of environmental factors on the population of H. nasus, aspects of population structure and description of microhabitat are also provided.