Density and Population Size of Mammals in Remnants of Brazilian Atlantic Forest

Chiarello, Adriano Garcia

doi:10.1111/j.1523-1739.2000.99071.x

Cited by 141 publications

(112 citation statements)

References 25 publications

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“…All the species in the fragments are extinction-prone. Other workers, using other approaches, have also suggested that all species will go extinct in fragments as small as the majority in which studies of effects of fragmentation are usually conducted [9,[33][34][35][36][37][38][39]. The fragments are in extinction debt [40].…”

Section: Discussionmentioning

confidence: 99%

Biological Correlates of Extinction and Persistence of Primates in Small Forest Fragments: A Global Analysis

Gibbons

Harcourt

2009

Tropical Conservation Science

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Habitat loss and fragmentation are two of the main threats facing wildlife. The species at risk in small fragments are not a random subset of the original community. Understanding the biology behind the distinction between species at risk and more persistent species should help inform conservation efforts. We attempted to identify risky traits in a well-known taxon, the primates, by asking which traits distinguished taxa that differed in the size of the smallest fragment in which they were recorded. We assumed that taxa that could persist in smaller fragments were at less risk of extinction than those that needed larger fragments. The traits investigated are indicative of amount of habitat needed, reproductive rate, and specialization. We obtained from the literature information on the presence-absence of 68 primate species of 36 genera in forest fragments of less than 100 km 2 . Association between size of smallest fragment and biology was tested with regressions, Spearman correlations, two-sample t tests, and non-parametric Wilcoxon tests. We found no significant relationships between area of smallest fragment in which species or genera persisted and any of the biological parameters. We suggest that the most likely explanation for this unexpected finding is that the smallest fragments in which primates are currently studied are usually so small that all primate species in them are doomed in the long-term and therefore, no biological traits distinguish taxa at risk. The finding implies that conservation research and efforts should be directed at assessing the efficacy of forest fragments and small biological preserves in conserving primate species.

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Section: Discussionmentioning

confidence: 99%

Biological Correlates of Extinction and Persistence of Primates in Small Forest Fragments: A Global Analysis

Gibbons

Harcourt

2009

Tropical Conservation Science

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“…A metodologia de amostragem em transecto linear, descrita em Buckland et al (1993) foi empregada devido à sua eficiência comprovada, em especial, para espécies arborícolas como primatas (Peres 1999), mas também pela sua ampla utilização para estimar abundância e densidade de espécies em vários estudos com mamíferos (Emmous 1984, Thompson et al 1988, Chiarello 1999, 2000, Cullen Jr. et al 2000, 2001, Carrillo et al 2000.…”

Section: Amostragem Em Transecto Linearunclassified

“…Trabalhos realizados em remanescentes de Mata Atlântica mostram que algumas modificações das comunidades de mamíferos de maior porte estão relacionadas ao tamanho e à disponibilidade de recursos (Chiarello 1999(Chiarello , 2000. Apesar da maioria dos remanescentes de Mata Atlântica serem pequenos e dos mamíferos de maior porte estarem entre os grupos mais susceptíveis à extinção em paisagens fragmentadas são poucos os estudos que abordam este tema (Turner & Corlett 1995, Primack & Rodrigues 2001).…”

Section: Introductionunclassified

Registros de mamíferos de maior porte na Reserva Florestal do Morro Grande, São Paulo

Negrão

Valladares‐Pádua

2006

Biota Neotrop.

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Large mammals are known to be important for the maintenance of biological processes and diversity and to be highly susceptible to extinction in fragmented landscapes. However, there are few studies focusing on the community of large mammals in Atlantic Forest remnants. This study aims at surveying large mammals in a remnant of Atlantic forest near to São Paulo. The studied area is the Morro Grande Forest Reserve (RFMG), with 10.870 ha, located in the municipality of Cotia, SP. Seven areas inside the RFMG were studied with two methodologies: 1) line transect sampling and 2) sand plots for footprint recording. Others records of mammal species were also considered. Eighteen species of seven orders were found in the Reserve and were classified in four dietary categories being eight omnivorous, five herbivore, four frugivores and just one carnivorous. The line transect sampling recorded six species of three orders and footprint sampling recorded seven species of five orders. The smaller species, as the squirrel (Sciurus aestuans), the opossum (Didelphis aurita) and the brazilian rabbit (Sylvilagus brasiliense), were the most frequently recorded, and they were present in almost all the study's areas. The prevalence of smaller species and, the presence of some generalist species, indicate the high degree of disturbance and the low quality of this Reserve. The Reserva Florestal do Morro Grande do not maintain the integrity of large mammal community.

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“…Esse tipo de perturbação (incluindo a fragmentação) pode levar à perda de espécies de topo da cadeia trófica, o que por sua vez pode levar ao aumento na abundância de gambás (FONSECA & ROBINSON, 1990). De outra forma, espécies raras (ou mais especialistas) são as primeiras a se extinguirem do ambiente natural após excessiva perturbação (BONVICINO et al, 1997;CAUGHLEY, 1994;CHIARELLO, 2001;BONVICINO et al, 2002a). É provável que, pelo menos em parte, estes fenômenos tenham ocorrido na região devido ao intenso desflorestamento regional.…”

Section: Methodsunclassified

Distribuição geográfica de pequenos mamíferos não voadores nas bacias dos rios Araguaia e Paraná, região centro-sul do Brasil

Cáceres

Casella

Vargas

et al. 2008

Iheringia, Sér. Zool.

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ABSTRACT. Geographic distribution of small non-volant mammals in the Araguaia and Paraná basins, south-central region of Brazil. We collected small mammals in two hydrographic basins in central Brazil, namely the Paraná and Araguaia basins, with the aim of examining the composition of forest dwelling small mammal species and to compare their geographic distributions. Fourteen sites were sampled, eight in the Paraná basin and six in the Araguaia basin. A total of 20 species of small mammals was registered (8 marsupials and 12 rodents), 16 of them in live traps (5,253 trap-nights) and eight in pitfalls (224 trap-nights), adding to a total of 161 captures of 139 individuals. The Paraná basin showed 16 species (trap-nights: 3,115 and 104 respectively) and the Araguaia basin 11 species (trap-nights: 2,138 and 120 respectively), being both richness similar when the rarefaction method was applied. Seven (35%) out of the 20 species recorded occurred in both basins. (Thomas, 1901). The range extension of some species is discussed, in addition to biogeographic considerations. The Caiapós Mountains may have been a geographic barrier for some small mammal species in the face of the retraction and expansion of forests in the past. (Massoia, 1973), Oligoryzomys sp., Proechimys longicaudatus (Rengger, 1830) e P. roberti (Thomas, 1901). A ampliação da distribuição de algumas espécies é discutida, assim como aspectos biogeográficos. A Serra dos Caiapós pode ter sido uma barreira geográfica para algumas espécies de pequenos mamíferos em face da retração e expansão das florestas ocorridas no passado. PALAVRAS-CHAVE.Bacia do Araguaia, Bacia do Paraná, pequenos mamíferos, corredores florestais, Cerrado.O Brasil é o país que possui a maior riqueza de espécies de mamíferos e é um dos que detém o maior número de endemismos, totalizando 131, com destaque para primatas e roedores (FONSECA et al., 1996; MINISTÉRIO DO MEIO AMBIENTE, 2000). Estes números são notáveis devido à presença no país de ricas formações vegetais que propiciam que os mamíferos sejam muito diversos. Estas formações vegetais compreendem a Floresta Amazônica e a Floresta Atlântica, além do Cerrado, que ocupam grande parte do território brasileiro e abrigam a maioria das espécies de mamíferos (FONSECA et al., 1996;EMMONS & FEER, 1997).Dentre os mamíferos, destacam-se as espécies de pequenos mamíferos não voadores e os morcegos, que representam a maioria das espécies de mamíferos. Os pequenos mamíferos não voadores, representados principalmente pelas famílias Didelphidae (entre os marsupiais) e Cricetidae e Echimyidae (entre os roedores),

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Density and Population Size of Mammals in Remnants of Brazilian Atlantic Forest

Cited by 141 publications

References 25 publications

Biological Correlates of Extinction and Persistence of Primates in Small Forest Fragments: A Global Analysis

Biological Correlates of Extinction and Persistence of Primates in Small Forest Fragments: A Global Analysis

Registros de mamíferos de maior porte na Reserva Florestal do Morro Grande, São Paulo

Distribuição geográfica de pequenos mamíferos não voadores nas bacias dos rios Araguaia e Paraná, região centro-sul do Brasil

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