<i>Akodon cursor</i>(Rodentia: Cricetidae)

Geise, Lena

doi:10.1644/893.1

Cited by 13 publications

(9 citation statements)

References 43 publications

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“…The higher abundance of the rodents O. nigripes and A. cursor in areas with greater anthropic influence (peridomicile), also confirms the opportunistic nature of these species in relation to habitat occupancy, as previously observed in disturbed regions and along forest borders (Olifiers et al 2005, Vaz et al 2007, Geise 2012, Cardoso et al 2016, Gonçalves et al 2016. However, A. cursor showed more association with habitat variables, such as a close vegetation near the ground, which can provide shelter, protection against predators, and food resources (Dalmagro and Vieira 2005, Lima et al 2010, Melo et al 2013), a higher vegetation density in the understory and an open canopy, which are characteristic of open areas (Cirelli and Penteado-Dias 2003).…”

Section: Discussionsupporting

confidence: 80%

Community structure and population dynamics of small mammals in an urban-sylvatic interface area in Rio de Janeiro, Brazil

Gentile¹,

Cardoso²,

Costa-Neto³

et al. 2018

Zoologia

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ABSTRACT. The Atlantic Forest is one of the most disturbed Brazilian biomes, with 183 out of 298 species of mammals occurring in the state of Rio de Janeiro. In this study, we aimed to characterize the diversity, community structure, and habitat use of small mammals in the FIOCRUZ Atlantic Forest Campus (CFMA), including areas of Pedra Branca State Park (PBSP, subunit Pau da Fome), state of Rio de Janeiro. We also compared species diversity and composition between two moments 15 years apart (2001 and 2012-2015) and analyzed the population dynamics of the marsupial Didelphis aurita (Wied-Neuwied, 1826). Small mammal captures were made in different habitats: sylvatic-urban interface areas near human dwellings, disturbed forest, and preserved forest areas. Five marsupial species and four rodent species were captured in both periods. There was a reduction in species richness and β diversity between the two periods, indicating that disturbances in the environment over the years may have affected the small mammal community structure. The most altered environment showed the greatest species richness and abundance, while the forest areas showed the smallest values, which may be explained by the loss of mammal species, mainly specialist species in forested areas. We identified three groups of species according to habitat preferences: one related to environments with a higher density of vegetation in upper strata -Marmosa paraguayana (Tate, 1931) and Monodelphis americana (Müller, 1776), another related to a higher density in lower forest strata -Akodon cursor (Winge, 1887), and another with no association with the investigated habitat variables -D. aurita and Oligoryzomys nigripes (Olfers, 1818). The small mammal community structure showed a low level of nestedness in both sampling periods. This study is the first report to evaluate the community structure of small mammals in the sylvatic-urban interface area of Pedra Branca State Park, the largest forest reserve within an urban area in Brazil. The surveys indicate that the small mammal diversity was low in both sampling periods and in both areas, and a species loss in the Pau da Fome locality was observed, despite it is a conservation unit. The greater species abundance and richness in the most disturbed areas suggest an increase of factors favoring the occurrence of synanthropic and opportunistic species.

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Section: Discussionsupporting

confidence: 80%

Community structure and population dynamics of small mammals in an urban-sylvatic interface area in Rio de Janeiro, Brazil

Gentile¹,

Cardoso²,

Costa-Neto³

et al. 2018

Zoologia

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“…A comparison between the cranio-dental measurements of adults of A. cursor and A. montensis are presented in Table 7. Even though only one A. cursor specimen was identified in the EEB sample, the values of some variables obtained for this species are higher than the highest values obtained for A. montensis; this corroborates the craniometric differentiation of these species (Gonçalves et al, 2007;Geise, 2012). The most significant and informative variables were: interorbital width, for which A. montensis presented mean value of 4.99 mm and maximum value of 5.30 mm, while the value obtained from the EEB specimen of A. cursor was 5.38 mm; length of the palatine bridge, which ranged from 3.14 to 4.05 mm, with mean value of 3.62 mm in A. montensis, while the observed value in A. cursor was 4.09 mm; length of the upper molar series, with mean value of 4.19 mm in A. montensis, with only one specimen showing greater value (4.45 mm) than the value obtained for A. cursor (4.43 mm); and width of M1, for which A. montensis presented mean value of 1.18 mm and maximum value of 1.28 mm, and the observed value in A. cursor was 1.30 mm.…”

Section: Tribe Akodontini Genus Akodonsupporting

confidence: 71%

Small mammals of the Estação Ecológica de Bananal, southeastern Atlantic Forest, Brazil, with description of a new species of Brucepattersonius (Rodentia, Sigmodontinae)

Abreu-Júnior

Percequillo

2019

Arq. Zool.

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The Atlantic Forest harbors an impressive diversity of nonvolant small mammals. Despite having been the target of many ecological and taxonomical studies in the last decades, this group is still poorly known in several aspects – basic information on intrapopulational morphologic variation and proper diagnoses are lacking for many species, even for common taxa. This is related to the fact that large series of specimens from a single locality are extremely rare in scientific collections. A consistent sampling effort was conducted at Estação Ecológica de Bananal, northeastern São Paulo State, throughout seven field expeditions between 2003 and 2011, under the coordination of the Museu de Zoologia da Universidade de São Paulo, resulting in extensive series of nonvolant small mammals. We studied in detail the external and cranio-dental morphology of this sample (575 specimens), that we assigned to 31 known species besides one new species to science. Most species belong to order Rodentia (26 species) from the families Cricetidae (22 species) and Echimyidae (four species); the remaining (six species) are marsupials from the order Didelphimorphia, family Didelphidae. This is one of the most diverse assemblages ever recorded in this biome, and includes some of the rarest endemic rodents of the Atlantic Forest, such as Abrawayaomys ruschii, Blarinomys breviceps, Drymoreomys albimaculatus, Phaenomys ferrugineus, Phyllomys kerri and Rhagomys rufescens. This outstanding richness can be explained by the extensive sampling effort performed for a long period of time. Also, the capture success of the third expedition (8.25%) is among the highest rates obtained in the Atlantic Forest and the extensive use of pitfall traps was fundamental for trapping this high number of species. Herein, we provide an annotated list of nonvolant small mammals occurring at Estação Ecológica de Bananal, with comprehensive analyses of morphological variation and detailed diagnoses that will allow their proper identification, and will provide a sound basis for a better comprehension of the geographic variation of these taxa across the biome. We also present a formal description for a new species of Brucepattersonius from the mountain ranges along the Paraíba do Sul valley. For five species of sigmodontine rodents, we investigate the levels of ontogenetic and sexual variation, and while the first is accentuate in all analyzed species the second does not contribute significantly to intrapopulation variation.

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“…Akodon cursor, the most common species in this study, is often the most abundant rodent in fragmented landscapes of the Atlantic Forest (Stallings 1988, Paglia et al 1995, Gentile 1996, Olifiers 2002). This species has generalist habits and is tolerant to human disturbance, being very common in open areas (Pires et al 2002, Olifiers 2002, Geise 2012.…”

Section: Discussionmentioning

confidence: 99%

A Survey of Small Mammals in the Atlantic Forest of the Northwestern Region of Rio De Janeiro State

Gonçalves-Oliveira¹,

Teixeira

Olifiers³

et al. 2016

Oecol. Austr.

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Small mammals (marsupials and rodents) are one of the most diverse groups of Atlantic Forest mammals, representing 40% of the total diversity of mammals in this biome. Some regions, such as northwestern Rio de Janeiro State, have gaps in mammal inventories. Therefore, we performed small mammal inventories in four fragmented landscapes in the northwestern Rio de Janeiro State using live traps and camera traps. Capture transects were placed both in forest fragments and the altered matrix. We captured six species of marsupials, six Sigmodontinae rodents and one echimyid rodent. The small mammal fauna recorded in this study was composed predominantly of typical Atlantic Forest species, with four endemic species. Furthermore, we obtained the first record of Calomys cerqueirai in the Atlantic Forest of Rio de Janeiro State as well as its syntopy with C. tener. These findings expand the reported geographic distribution of both species.

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Akodon cursor(Rodentia: Cricetidae)

Cited by 13 publications

References 43 publications

Community structure and population dynamics of small mammals in an urban-sylvatic interface area in Rio de Janeiro, Brazil

Community structure and population dynamics of small mammals in an urban-sylvatic interface area in Rio de Janeiro, Brazil

Small mammals of the Estação Ecológica de Bananal, southeastern Atlantic Forest, Brazil, with description of a new species of Brucepattersonius (Rodentia, Sigmodontinae)

A Survey of Small Mammals in the Atlantic Forest of the Northwestern Region of Rio De Janeiro State

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