Programa de Pós-Graduação em Zoologia - PPGZOOL/ICB

URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/2343

O Programa de Pós-Graduação em Zoologia (PPGZOOL) do Instituto de Ciências Biológicas (ICB) foi consolidado como um convênio entre Universidade Federal do Pará (UFPA) e Museu Paraense Emílio Goeldi (MPEG).

Navegar

Agora exibindo 1 - 20 de 27

Acesso aberto (Open Access)
Aprendizado espaço-tempo no forrageamento de abelhas sem ferrão amazônicas (Apidae, Meliponini)
(Universidade Federal do Pará, 2012) JESUS, Thiago Nazareno Conceição Silva de; VENTURIERI, Giorgio Cristino; http://lattes.cnpq.br/7180149611727426; CONTRERA, Felipe Andrés León; http://lattes.cnpq.br/3815182976544230
Acesso aberto (Open Access)
Aves da Floresta Nacional do Tapajós: composição, distribuição ecológica e efeitos da exploração madeireira de baixo impacto
(Universidade Federal do Pará, 2005) HENRIQUES, Luiza Magalli Pinto; OREN, David Conway; http://lattes.cnpq.br/5451507856491990
Acesso aberto (Open Access)
As aves do estado do Maranhão: atualização do conhecimento e conservação em uma região de ecótono entre a floresta Amazônica e Cerrado
(Universidade Federal do Pará, 2018-09-12) CARVALHO, Dorinny Lisboa de; SILVA, Daniel de Paiva; http://lattes.cnpq.br/1409353191899248; SANTOS, Marcos Pérsio Dantas; http://lattes.cnpq.br/7941154223198901
The state of Maranhão is located between the eastern Amazon and the northern Cerrado, presenting a wide variety of environments in its ecotonal area. Due to this environmental heterogeneity, Maranhão has one of the richest avifaunas in Brazil. Furthermore, this region includes one of the world's most endangered biogeographical provinces. In order to contribute to the knowledge and conservation of avifauna in this region, this study has as its main objectives: 1) review and update the checklist of birds species from Maranhão to identify possiblesampling gaps in the state; 2) test the effectiveness of the State Protected Areas (PAs) and Indigenous Lands (TIs) system in the protection of threatened and endemic bird species using SDMs and; 3) assess the potential impact of climate change on the distribution and conservation of 24 threatened bird taxa occurring in the state, comparing current and future distributions (2070) with the current reserve system, in order to identify potentially stable areas that can serve as dispersal corridors for the evaluated taxa. In chapter 1) we recorded the occurrence of 750 bird species, distributed into 88 families and 30 orders. We added 114 new species (95 residents, 13 migratory and 6 vagrants) to the last list compiled 27 years ago for the same region. In chapter 2) we observed that taxa with wider distributions are protected equally as taxa with smaller distributions and larger PAs are more efficient than smaller. Our results also showed that most Cerrado PAs are poorly allocated. We suggest six priority areas for conservation of Neotropical birds and highlight the importance of indigenous lands in conserving Neotropical biodiversity. In chapter 3) our results indicated that, although threatened Amazon and Cerrado taxa are potentially protected, for both present and future scenarios, most of the taxa are likely to suffer drastic population size declines or even global extinction in the near future. We highlight the importance of creating a system of dispersal corridors that interconnect PAs in this region, as well as the implementation of public policies for maintenance and mitigation of the areas adjacent to these corridors, aiming at the conservation of the richness and diversity of species in this region.
Acesso aberto (Open Access)
Avifauna do estado do Acre: composição, distribuição geográfica e conservação
(Universidade Federal do Pará, 2009) SILVA, Edson Guilherme da; SILVA, José Maria Cardoso da; http://lattes.cnpq.br/6929517840401044
The Brazilian state of Acre borders Peru and Bolivia, and is located in the lowlands of the southwestern Amazon basin, close to the foothills of the Andes, in a region considered to be biologically megadiverse. Despite this, the region is still relatively poorly‐known in scientific terms, and is considered to be a priority for further biological surveys. With the aim of contributing to the understanding of the bird fauna of southwestern Amazonia, the principal objective of the present study was to evaluate these three questions: (a) How many and which bird species are found in Acre? (b) How are the species distributed in the state? and (c) What is the conservation status of the resident species? These questions were evaluated through a number of different approaches: (a) a comprehensive review of the literature; (b) field surveys over a two‐year period, including the recording and collection of voucher specimens; (c) production of distribution maps for each taxon (including species and subspecies); (d) distribution of the taxa among the state’s three major interfluvia or subregions (east, central, and west); (e) identification of zones of contact and hybridization, based on the distribution of parapatric species within the state; (f) estimation of the potential distribution of the taxa within the state of Acre, based on the extrapolation of the area occupied by that of each ecological unit (phytophysionomy) in which they were recorded; (g) assessment of the conservation goals for each resident taxon; and (h) a gap analysis, based on the overlap of the potential distribution maps with the state’s protected areas. The gap analysis was conducted with reference to three different scenarios: (a) inclusion of all the protected areas; (b) inclusion of only the fully‐protected area exclusive sustainable‐use units and indigenous reservations; and (c) including fully‐protected and sustainable‐use units, but excluding indigenous reservations. The literature review and surveys (historical and current fieldwork) began in August, 2005, and continued until December, 2007. At the end of this period, a total of 7.141 records of birds had been accumulated for the whole of the state of Acre. Of these, 4.623 are of museum specimens, 2.295 (49,6%) of which were collected during the present study. The presence of 655 biological species was confirmed for Acre, distributed among 73 families and 23 orders. One direct result of the study was the addition of five new species to the list of Brazilian birds. Fifty‐nine migratory species were also recorded, including 30 (50,8%) Nearctic and 18 (30,5%) austral migrants, as well as 11 (18,6%) considered to be intratropical migrants. Forty‐four of the species recorded in the study are endemic to the Inambari endemism center. Of the 556 taxa of forest birds resident in Acre, 405 (72,8%) are found in all three subregions, 56 (10,0%) were recorded only in the western subregion, 30 (5.3%) in the eastern subregion, whereas only three (0,5%) were exclusive to the central area. At least six pairs of sister taxa have an allopatric distribution in the state, while 15 sets of taxa present a parapatric distribution. Two zones of secondary contact (east‐west) and two possible hybrid zones (east‐west) were identified within the state. The gap analysis revealed that, under scenario (a), 87,1% of the taxa were fully protected (100% conservation target), and 12% were considered intermediate, that is, partially protected, whereas only 0.8% were completely unprotected. In scenario (b), by contrast, only 0,6% of the taxa were fully protected, 97.6% were partially protected, and 1,8% were totally unprotected. In the third scenario (c), 73,5% of taxa were fully protected, 25,5% partially protected, and only 0,8% completely unprotected. The principal conclusions reached in the present study were: (a) the Brazilian state of Acre has an extremely rich bird fauna, although the number of species recorded should still increase as new surveys are conducted; (b) the Purus and Juruá rivers do not constitute physical barriers to the dispersal of most bird species resident in Acre; (c) the existence of zones of secondary contact not related to the state’s principal river systems supports the conclusion that factors other than physical barriers determine the present‐day pattern of distribution of some of the resident bird taxa in Acre; (d) that the number of “gap” and “partial gap” bird species in Acre is very low when the full protected area network is considered, although this number increases with the exclusion of indigenous reservations, and in particular, sustainable‐use conservation units; and (e) the only species completely unprotected by the state’s conservation network are those restricted to the campina and campinarana ecosystems of western Acre, which indicates a clear need for the establishment of one or more conservation units in this region with the specific aim of protecting this distinct type of ecosystem.
Acesso aberto (Open Access)
Biologia reprodutiva e alimentar de Liophis reginae semilineatus (Wagler,18424) e Liophis taeniogaster jan, 1863 (Serpentes, Colubridae, Xenodontinae) da Amazônia oriental, Brasil
(Universidade Federal do Pará, 2007) CASTRO, Luiz Paulo Printes Albarelli de; COSTA, Maria Cristina dos Santos; http://lattes.cnpq.br/1580962389416378
Acesso aberto (Open Access)
Biologia reprodutiva e hábito alimentar de Dendrophryniscus minutus (Melin, 1941)(Amphibia : Bufonidae) na Floresta Nacional de Caxiuanã, Pará
(Universidade Federal do Pará, 2003-06) TRAVASSOS, Alessandra Elisa Melo; GALATTI, Ulisses; http://lattes.cnpq.br/1040132527458660
This study examined reproductive characteristics, nutritional status and feeding habits in the litter anuran Dendrophryniscus minutus through individuals collected in the Estação Cientifica Ferreira Pena, Caxiuanã National Forest from April 1997 to April 1998. In a sample of 166 specimens were measured snout - vent length (SVL), mass of fat bodies, diameter, mass and number of ova in females and testis volume in males. The feeding habit in this species was also determined through analyses of stomach contents. Population structure showed a pattern with most adult individuals, including gravid females, in the rainy months, and juvenile recruitment in the beginning of the dry season. Similarly, the diameter and mass ova in the mar', used as indexes of gonadal development stage, were greater in the rainy season. Among males, the biggest testis volume also appeared in february and april, but there was no evident pattern of correlation to rainfall. Food consumption also did not show any pattern in variation along months and it was not correlated to fat mass. Fat bodies measurements were positively correlated to ova development in females indicating that fat accumulation and gonadal development may occur simultaneously. The diet in specie was composed for ants, termites and mites, terrestrial invertebrates in a great number in a litter in the studied area.
Acesso aberto (Open Access)
Composição, ecologia e história natural das serpentes de uma região de transição Amazônia - Cerrado, Mato grosso, Brasil
(Universidade Federal do Pará, 2010) ABE, Pedro Santos; COSTA, Maria Cristina dos Santos; http://lattes.cnpq.br/1580962389416378
This study aimed to document the composition and natural history of a community of snakes recorded at Tanguro Farm, Querência municipality, State of Mato Grosso, Brazil, an area which represents a transition between two major neotropical biomes, Amazonia and Cerrado. Six expeditions to the study site were carried out, resulting in the record of 203 specimens (194 captures), distributed in 34 species, 26 genera and 8 families. An estimate based in the incidence of rare species (Jackknife 1) indicated a total richness of 38 species in the study site, which demonstrate that the inventory was relatively exhaustive. The most abundant species were Caudisona durissa (N=50), Philodryas olfersii (N=15), Philodryas nattereri (N=13), Xenodon rabdocephalus (N=12), Lachesis muta (N=10) e Liophis almadensis (N=10). A Principal Coordinates Analysis (PCO) demonstrated that the taxocenosis are superimposed, revealing a trend to formation of three distinct groups: Amazonia’s, Cerrado´s and Mata Atlantica´s taxocenosis. The species composition at Tanguro Farm was intermediary between the groups formed by Amazonian and Cerrado species, occurring species with wide distribution ranges as well as species restrict to either Amazonia or Cerrado. The pattern of habitat use of the studied taxocenosis is terrestrial, followed by semi-arboreous and fossorial. With regards to the feeding strategies, there are a predominance of generalist snake species. An analysis of ecological groupings showed four functional groups, suggesting that the taxocenosis complexity could be explained by ecological and historical factors.
Acesso aberto (Open Access)
Composição, riqueza e abundância de espécies de anfíbios na região do médio rio Xingú
(Universidade Federal do Pará, 2009) LIMA, Amanda André; GALATTI, Ulisses; http://lattes.cnpq.br/1040132527458660
This study aimed to identify the amphibian fauna of different habitats in the region of the Middle Rio Xingu. We selected six sites, with samples taken from three breaths, between November 2007 and March 2008, totaling 48 days. We identified six types of habitats in the region: terra-firme forest, seasonally flooded forest (lowland), banks of the river, "pedral”, pond area and area with antropic disturbance. For data collection were used two field sampling methods: pitfall traps with drift fences and visual surveys. The traps were installed only in areas of terra-firme forest, while visual survey was employed in all types of habitats identified. The sampling resulted in the record of 56 species of amphibians and eight species were identified and recorded in previous studies in the area. Species diversity and richness were higher in Caracol site, where the predominance of the terra-firme forest was observed, and lower in the Ilha Grande, which is dominated by seasonally flooded forest. Nine reproductive modes were recorded in the study area, all found in the terra-firme forest and only three in the "pedral" which may reflect the low environment heterogeneity of this area. Two tests of similarity were performed to compare study sites, one for each method of collection. Similarity analysis of the data from visual surveys showed more similarity for species composition between areas of terra-firme forest than the other habitats. Cluster analysis between this study and other surveys conducted in the Amazon grouped the study area to another area also located in the Middle Xingu.
Acesso aberto (Open Access)
A comunidade de tubarões (Chondrichthyes : selachii : Galea) da formação pirabas, Neógeno da Amazônia Oriental
(Universidade Federal do Pará, 2005-03-10) COSTA, Sue Anne Regina Ferreira da; RICHTER, Martha; http://lattes.cnpq.br/9381228195500524; TOLEDO, Peter Mann de; http://lattes.cnpq.br/3990234183124986
The shark community (Selachii:Galea) from the Pirabas Formation in one of the most representative of the Neogene in South America due to its high diversity of taxa and range of ecological components. The presence of eight known genera enabled to establish hypothesis about the trophic chain of the vertebrate palaeocommunity, as well as to corroborate previous reconstructions about the paleoenvironmental parameters of this geologic unit. This study dealt with the taxonomic revision of the shark community on both generic and species leveis, allowing the following composition: Carcharhinus spl, Carcharhinus sp2, Carcharhinus sp3, Carcharhinus priscus, Sphyrna magna, Hemipristis serra, Carcharodon megalodon, Isurus sp, Ginglymostoma serra, Ginglymostoma obliquum. The analyses of newly collected specimens and microscopic material allowed a considerable expansion of identified individuals up to 231 teeth. This work is a contribution to refine the knowledge about the regional patterns of shark paleobiogeography.
Acesso aberto (Open Access)
A comunidade ictica e suas interrelacões tróficas como indicadores de integridade biológica na área de influencia do projeto hidrelétrico Belo Monte-Rio Xingu, PA
(Universidade Federal do Pará, 2004-04) CAMARGO-ZORRO, Mauricio; ISAAC, Victoria Judith; http://lattes.cnpq.br/3696530797888724
This study presents applied methodologies to better understand the dynamics of mechanisms characterizing a portion of the Xingu River, with respect to fish communities living in that environment. Through the study of the ichthyofauna it is aimed to verify various environmental standard patterns, in order to assess the current conservation state of a part of the Xingu River. Based on surveys of the local ichthyofauna conducted over seasonal variations, analyses were conducted at the specieS, population and trophic guild levels. With regards to the ecological population level, study of biological parameters such as individual growth rates, asymptotic body length, mortality rates and size at first maturity were good indicators for a better understanding of the life history of those fish groups. Therefore a trend was observed in which species of relatively small body size to followed a "r" type strategy, whilw species of larger body sizes would follow the "k" strategy tactics. From a functional point of view, it was verified that guild community structure is not only a good indicator of convergence patterns to similar ecosystems as like the Xingu River studied stretch, but also a tool to assess its conservation status. A steady- state ecosystem model for the medium Xingu River sector indicated that it is a system highly instable, and simultaneusly look like a mature seasonal system. An apparent seasonal restriction of food availability observed in the studied river section could imply optimum use efficiency and transfer of the trophic resources. A biogeographic study was undertaken based on species occurrence in order to conceptualise the River stretch comprised between the confluences of the Iriri and Xingu Rivers up to the vicinity of of the village Senador José Porfirio, in the Xingu basin. By means of this analysis, it was possible to demonstrate that the medium upstream of waterfalls) and lower (downstream) courses of the Xingu River are parts of two endemic areas. The low affinity of species composition observed in these two sectors is attributed to geographic variations in the landscape. Therefore, the boundaries of the waterfalls around the village of Belomonte and the influence of the Amazon River in the lower Xingu course could trigger differences in ichthyofaunal composition and species abundance when compared to the medium course of that river. Finally, the importance of maintaining all hydrologic connectivity is pointed out in order to maintan the unity of the system, from the headwaters to the mouth. Impacts on environmental processes and fish populations in the medium course of the Xingu River as a result of the eventual construction of the Belemonte hydroelectric dam are discussed.
Acesso aberto (Open Access)
Dieta e uso de hábitat por Physalaemus ephippifer (Steindachner, 1864) (Anura: Leptodactylidae) na Amazônia Oriental
(Universidade Federal do Pará, 2013) RODRIGUES, Lenise Chagas; COSTA, Maria Cristina dos Santos; http://lattes.cnpq.br/1580962389416378
Acesso aberto (Open Access)
Dieta, área de uso e transporte de girinos de Ameerega trivittata (Spix, 1824) (Anura: Dendrobatidae) em uma região de floresta de terra firme na Amazônia Oriental
(Universidade Federal do Pará, 2012) LUIZ, Luciana Frazão; OLIVEIRA, Selvino Neckel de; http://lattes.cnpq.br/1315649023145433; CONTRERA, Felipe Andrés León; http://lattes.cnpq.br/3815182976544230
Acesso aberto (Open Access)
Distribuição e abundância de médios e grandes mamíferos na Amazônia central
(Universidade Federal do Pará, 2015) RAVETTA, André Luís; ALBERNAZ, Ana Luisa Kerti Mangabeira; http://lattes.cnpq.br/1220240487835422
Medium and large mammals are an important protein source for many human populations, and, depending on the species, their populations may suffer reductions related to hunting and consumption, habitat degradation or both. The distribution and abundance of these animals can vary with the quality and quantity of the surrounding forests (influence of natural and human factors). The study of this variation may help define public policies for the management and conservation of species and to analyze the effectiveness of protected areas. This study aimed at improving the knowledge of the medium and large mammal distribution patterns in order to evaluate a public policy for the western part of the Para State, which was the implementation of Sustainable Forest District of BR-163. In a study case, the geographical distribution of a species of primate, the white marmoset (Mico leucippe) was expanded based on new records for the region. The Maximum Entropy algorithm was used to predict the potential distribution of species based on its potential ecological niche and assist in defining the geographical boundaries for future surveys. The result of this study served as a parameter for reviewing the conservation status of the species, which had its status changed to the category of "Least Concern" in the national and the IUCN Red lists. In the second part of the study population surveys were conducted to identify the factors influencing the pattern of distribution and abundance of medium and large mammals. For this purpose, densities of species were estimated based on linear transects surveys and analyses of the relation between the density distribution and environmental variables, such as temperature, rainfall and altitude, and anthropogenic variables, as a percentage of deforestation, distance to cities and towns, and distance to roads. There was low variation in species abundance along the DFS of the BR-163, and variation in responses depending on the species, but in general there was influence of rainfall (average annual rainfall and rainfall in the dry season) and anthropogenic factors (proximity roads) on density variation. Increment in the sampling 11 effort was analyzed for the most abundant species and has led to increased precision in the density estimation but did not indicate substantial change in the estimate. The relationships found were not strong enough to allow a generalization about the area, but the results establish a parameter for future comparisons, given the good condition of the sampled areas. This was the first study of mammals in the region for that scale, which matched an actual public policy for the region.
Acesso aberto (Open Access)
A diversidade de mamíferos de médio e grande porte e o potencial desta fauna na regeneração de clareiras artificiais na região do Rio Urucu, Coari, Amazonas
(Universidade Federal do Pará, 2009) SANTOS, Fernanda da Silva; OLIVEIRA, Ana Cristina Mendes de; http://lattes.cnpq.br/1199691414821581
The region of Urucu River, in western Brazilian Amazon, is a priority area for conservation due to its species richness and biogeographical importance. In this region activities of oil and natural gas extraction are developed, which results gaps opening in the continuous forest. The objective of this study was to 1) estimate the species richness, composition and abundance of the medium and large-sized mammals community by linear transect, indirect evidences and camera traps; and to 2) record the presence of the mammals species on the gap through camera traps and direct observations, verifying its participation on the gap regeneration process. Additionally, camera traps were also installed in forest to work as control-areas. A total of 40 mammal species were recorded, 25 by linear transect, 16 by indirect evidences, and 15 by camera traps. The species Lagothrix cana was the most abundant by using linear transect, while T. terrestris was the most abundant by using camera traps and indirect evidences. Camera traps sampled seven species in gaps and 14 in forest. The most frequent species sampled in gaps are herbivore-frugivorous. The direct observation in gaps totalized 144 hours, where three species were registered. In gaps, the specie Dasyprocta fuliginosa frequently exhibited behavioral categories “walking” and “stopped”, while the species Tapirus. terrestris and Saguinus pileatus spent more time feeding. Data obtained by monitoring gaps let us to suggest that mammals can play an important role on the regeneration of these areas through the processes of herbivory and dispersal of fruits and seeds.
Acesso aberto (Open Access)
Ecologia alimentar de Saimiri macrodon (Elliot, 1907) (Primates: Cebidae) em floresta de várzea na Amazônia Central
(Universidade Federal do Pará, 2016-04-20) LAUTON, Denise Costa Rebouças; BAHIA, Marcelo de Oliveira; http://lattes.cnpq.br/3377799793942627
The availability of fruits in the Amazon floodplain forests is seasonal what demand from frugivorous adaptive strategies to ensure their survival in periods of fruit scarcity. In this scenario we evaluated the diet, activity patterns and the use of space by Saimiri macrodon during periods of higher (aquatic phase) and lower (terrestrial phase) fruit availability in the várzea forest of Mamirauá Sustainable Development Reserve, Brazil. Social units were followed and the behavior of the animals was recorded through scan sampling method within two minutes between eight-minute intervals. Saimiri macrodon presented faunivorous-frugivorous diet, and arthropods were important in the diet during both ecosystem phases (59.5% of the records; N = 899), despite the highest consumption during the terrestrial phase (t = 3.40, df = 41; p = 0.001). In the aquatic phase, S. macrodon consumed an average of 29 fruits more than in the terrestrial phase. Fruits of Ficus species were the most consumed in both phases, demonstrating the relevance of this genus to S. macrodon, especially during the period of greater fruit scarcity. The general activity budget followed the common pattern of squirrel monkeys, with the predominance of travelling (56%) and feeding (23%), and the rest of the records distributed among social interactions (6%) resting (< 1,0%) and others (7,5%). Among the activities, social interactions, resting and food were the only ones that showed a significant difference between the phases, having been both more frequent during the aquatic phase, in which fruit availability is higher. In both phases, S. macrodon occupied the low várzea more often and fed mainly on medium (55.8%) and high (35.8%) forest vertical strata. The results are similar to other studies on squirrel monkeys, which indicate typical genus behavior patterns though, S. macrodon, different of the expected, has used mostly the medium and high strata of the canopy.
Acesso aberto (Open Access)
Ecologia comportamental de Alouatta belzebul (Linnaeus, 1766) na Amazônia Oriental sob alteração antrópica de hábitat
(Universidade Federal do Pará, 2005-03-14) CAMARGO, Carolina Cigerza de; FERRARI, Stephen Francis; http://lattes.cnpq.br/3447608036151352
The behavioural ecology of two groups of red-handed howler monkeys (Alouatta belzbul) was monitored ou Gennoplasma island (Tucuruí, in the Brazilian state of Pará), between April and September 2004. The two study groups were of similar size and composition, but inhabited different forest types: native forest (group P) and a plantation of native tree species (group Q). Quantitative behavioural data were collected in three-minute scan samples conducted at ten-minute intervals. "AH events" sampling was used to record rare activities such as social and interspecific interactions. Resting was the predominant activity in both groups (P: 67.3%; Q: 61.9%), followed by feeding (P: 15.7%; Q: 21.4%), and locomotion (P: 15.8%; Q: 15.5%). The proportions of the first two categories were significantly different. The diet of both groups was folivorous-frugivorous, supplemented mainly by flowers. No significant seasonal variation was recorded in the diet of either group. The groups occupied home ranges of similar size (P: 5.25 ha; Q: 5.50 ha), although group P travelled 612 m ou average per day, as against 541 m for group Q. Both groups used preferentially their "original" habitat (group P: native forest; group Q: plantation), and the uppermost forest strata. Interspecific interactions were pacific, and social interactions were rare. The results of the present study present greater similarities with those of A. belzebul studies carried out in fragments of Atlantic Forest than at other Amazonian sites (continuous forest). This suggests that habitat disturbance may be a more important determinant of behaviour patterns than the characteristics of the biome. Overall, the results of the present study conicide with the typical Alouatta patterns of behaviour described in the literature.
Acesso aberto (Open Access)
Ecologia de culicídeos vetores de febre amarela silvestre em relação ao microclima na Floresta Nacional de Caxiuanã-Melgaço-PA
(Universidade Federal do Pará, 2007) PINTO, Claudeth de Souza; MASCARENHAS, Bento Melo; http://lattes.cnpq.br/3279744837272788; CONFALONIERI, Ulisses Eugênio Cavalcante; http://lattes.cnpq.br/0960107425984526
The species vectors of yellow fever are distributed, in the Americas, in the genera Haemagogus and Sabethes. The culicidae have their blood-sucking activities influenced both by endogenous and exogenous factors, such as the responses to microclimatic factors. The micoclimate and the stratification of the mosquito hosts are the main determinants for the occupation of ecological niches by culicids in the tropical forests. This study was developed in the micrometeorological tower of the Caxiuanã National Forest, in the municipality of Melgaço, State of Pará, Brazil. The aims were to analyse the vertical distribution of the species vectors of yellow fever in relation to microclimate in the dense upland forest, from July 2005 to April 2006, at ground level and in platforms at 8m, 16m and 30 meters. Collections were made for 12-hour periods, both at night and during the day, with the use of human attractors. Temperature and humidity records were made at all heights where the collections were made and the precipitation was measured at the top of the tower. A total of 25,498 specimens of culicids were collected, among which 1028 were from the genus Haemagogus and 502 from Sabethes, captured during daytime. The species of Sabethes and Haemagogus janthinomys were found mostly at the canopy level, especially at the heights of 16 and 30 meters, while Haemagogus leucocelaenus was more frequent in the ground. The rainiest months were associated to the greatest number of specimens of the different species but this was not statistically significant. However, there was a significant relationship between temperature, relative humidity and the number of yellow fever vectors collected.
Acesso aberto (Open Access)
Ecologia de cuxiús (Chiropotes Satanas) na Amazônia oriental: perspectivas para a conservação de populações fragmentadas
(Universidade Federal do Pará, 2002-10-04) SANTOS, Ricardo Rodrigues dos; FERRARI, Stephen Francis; http://lattes.cnpq.br/3447608036151352
Found throughout much of Brazilian Amazonia, the bearded sakis (Chiropotes albinasus and Chiropotes satanas) are primates specialised for seed predation. In order to delineate activity patterns and the exploitation of dietary resources, two social groups (10 and B4) of C. satanas were monitored between July and November, 2001, at the reservoir of the Tucurui hydroelectric power station in the state of Pará. Group 1G (C.s. utahicki), with 24 members, occupies an island of 100 ha, whereas group B4 (C. s. satanas), with 27 members, inhabits an area of continuous forest, both protected by Eletronorte S.A. Quantitative behavioural data were collected in scan samples, with a 5 min interval, collected continuously during five days per month. Complementary observations were recorded in ad libitum fashion throughout the study period, which started in April. A total of 5490 reords were collected for group 1G (only the feeding behaviour of group B4 was analysed here), distributed between feeding (58,8%), locomotion (30,8%), rest (9,5%) and other activities (0,9%). These proportions varied considerably between months. One hundred and ten plant species were exploited by the sakis. As expected, seeds were the main dietary item in both cases (group 1G: 75,6%, n = 2721 records; group B4: 49,6%, n = 1865). Remaining dietary items included flowers, fruit, leaf shoots and the mesocarp of palm fruits, although insectivory was not observed. Similar variation in the consumption of different items was observed in the two groups between September and November. Taxonomic diversity of the diet of group 1G was greater than that of B4, as was its home range (100 vs. 57 ha). No systematic variation was found in foraging party size. The results of the study indicate that the remnant populations of bearded sakis in the region's fragmented landscape have good long-term potential for conservation.
Acesso aberto (Open Access)
Ecologia de lagos da planície inundada do baixo Tapajós: diversidade, estrutura de comunidade de peixes e percepções socieconômicas dos moradores de Alter do Chão, Santarém-PA
(Universidade Federal do Pará, 2005-10-07) COSTA, Luiz Rodolfo Ferreira da; BARTHEM, Ronaldo Borges; http://lattes.cnpq.br/4192105831997326
Acesso aberto (Open Access)
Ecologia do bagre Ageneiosus ucayalensis Castelnau, 1855 (Siluriformes: Auchenipteridae) em uma ria fluvial da Amazônia oriental
(Universidade Federal do Pará, 2015) OLIVEIRA, Valéria de Albuquerque; ROCHA, Rossineide Martins da; http://lattes.cnpq.br/4371300451793081; MONTAG, Luciano Fogaça de Assis; http://lattes.cnpq.br/4936237097107099