Patterns of small mammal diversity in fragments of subtropical Interior Atlantic Forest in eastern Paraguay

Sancha, Noé U. de la

doi:10.1515/mammalia-2013-0100

Cited by 22 publications

(31 citation statements)

References 47 publications

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“…The entire non‐volant small mammal fauna of Paraguay consistently formed a distinct compartment along with other Interior AF sites. Paraguayan AF fragments have non‐volant small mammal communities comprised of species that phylogenetically are closely related to species from three different regions (de la Sancha, ): (1) southern coastal AF, including parts of Argentina, Uruguay and south‐eastern Brazil (de la Sancha et al ., , ; Valdez & D'Elía, ), (2) central and northern Brazil (de la Sancha et al ., ), and (3) the Chaco and Cerrado of Paraguay and Brazil (de la Sancha, ). The presence of Paraguayan compartments supports the contention that coastal and interior portions of the AF are distinct biogeographical units (Chebez & Massoia, ).…”

Section: Discussionmentioning

confidence: 99%

Metacommunity structure in a highly fragmented forest: has deforestation in the Atlantic Forest altered historic biogeographic patterns?

Sancha

Higgins

Presley

et al. 2014

Diversity and Distributions

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Aim To determine whether there is evidence of changes in small mammals distributions and emergent metacommunity structure in the Atlantic Forest resulting from extensive habitat loss and fragmentation associated with anthropogenic activities. Location South American Atlantic Forest from northeastern Brazil to eastern Paraguay. Methods Using presence–absence data for non‐volant small mammals, we analysed metacommunity structure for communities from 76 fragments distributed throughout Atlantic Forest. We evaluated coherence, range turnover and range boundary clumping for the entire non‐volant small mammal assemblage, marsupials, rodents and sigmodontine rodents separately. β‐diversity based on the multiplicative model was used to estimate the number of compartments (groups of sites with similar species composition) in Clementsian structures, and cluster analysis identified which sites formed compartments. Canonical correspondence analysis determined which environmental factors were associated with the gradients along which metacommunities were structured. Distance‐decay analysis evaluated the spatial structure in small mammal and environmental data, and Mantel tests evaluated correlations between them. Results Rodent metacommunities had Clementsian structure, whereas marsupials had Gleasonian structure. Compartment locations for rodents were consistent with areas of endemism. Temperature seasonality was most associated with the gradients along which metacommunities were structured. Assemblage and environmental dissimilarity among sites had significant positive relationships with geographic distance. Main conclusions Compartment locations in Clementsian structures mirrored historical refugium locations and important vicariance events associated with large rivers. Despite extensive deforestation in Atlantic Forest, small mammal distributions are consistent with expectations based on historical biogeography, suggesting that anthropogenic activities have not yet greatly affected geographic distributions of emergent metacommunity structures. However, extinction debt associated with recent fragmentation and habitat loss may exist. Any effective conservation plan for large and fragmented biomes must consider areas of endemism to maintain regional biodiversity and maintain sufficiently large and connected fragments to facilitate rescue effects and minimize effects of extinction debt.

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Section: Discussionmentioning

confidence: 99%

Metacommunity structure in a highly fragmented forest: has deforestation in the Atlantic Forest altered historic biogeographic patterns?

Sancha

Higgins

Presley

et al. 2014

Diversity and Distributions

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“…The IAF of eastern Paraguay is home to small mammal assemblages different from other portions of the coastal Brazilian Atlantic Forest (de la Sancha, 2014;de la Sancha et al, 2014).…”

Section: Methodsmentioning

confidence: 99%

“…As a result of a recent study of the effects of habitat fragmentation on the biodiversity of small mammals in eastern Paraguay (de la Sancha, 2010(de la Sancha, , 2014, we have collected parasite samples in several cricetid rodents. Herein, we describe a new species of Litomosoides Chandler, 1931 (Nematoda, Onchocercidae) parasitising the body cavity of the tuft-toed rice rat Sooretamys angouya (Fischer).…”

Section: Introductionmentioning

confidence: 99%

Description of Litomosoides ysoguazu n. sp. (Nematoda, Onchocercidae), a parasite of the tuft-toed rice rat Sooretamys angouya (Fischer) (Rodentia: Cricetidae), and a first record of L. esslingeri Bain, Petit & Berteaux, 1989 in Paraguay

Notarnicola

Sancha

2015

Syst Parasitol

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Paraguay is a small landlocked country whose mammalian fauna is among the least studied in South America, as well as their parasites. As a result of a study of the effects of habitat fragmentation on small mammal biodiversity in eastern Paraguay, we have collected some parasites of cricetid rodents. Herein, we describe a new species of Litomosoides Chandler, 1931 parasitising the body cavity of the tuft-toed rice rat Sooretamys angouya (Fischer) and Litomosoides esslingeri Bain, Petit & Diagne, 1989 parasitising Oligoryzomys nigripes (Olfers), thus expanding its geographical distribution into Paraguay. Litomosoides ysoguazu n. sp. is characterised by the large size of the females (92.2-117.6 mm long) and by having buccal capsule with an anterior widening with rounded edges on the chitinous segment and a rounded widening at the base; male tail with a single pair of adcloacal papillae, three to five pairs of asymmetrical postcloacal papillae, and one or two unpaired papillae in the median ventral line; spicules corresponding to the "sigmodontis" species group; and microfilaria with a sheath stuck to the body and visible in the anterior extremity. We also describe a fourth-stage female larva. Oligoryzomys nigripes is a new host record of L. esslingeri; this enlarges the host record to eight species highlighting the low specificity of this species.

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“…As such, Cryptonanus chacoensis singles out from all small marsupials, given its distribution east and west of the Paraguay River occupying a wide range of habitats, from the Dry Chaco to subtropical Interior Atlantic Forest remnants , de la Sancha 2014. Gracilinanus is only found east of the Paraguay River; the record from the Chaco provided by Yahnke (2006) is based on a specimen of C. chacoensis (FMNH 164089).…”

Section: Biogeography Both Sides Of the Paraguay Rivermentioning

confidence: 99%

Additions to the Paraguayan mammal fauna: the first records of two marsupials (Didelphimorphia, Didelphidae) with comments on the alpha taxonomy of Cryptonanus and Philander

Sancha¹,

D’Elı́a

2015

Mammalia

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Even though Paraguay has had a long history of Mammalogy, since 2007, several new rodent, bat, marsupial, and armadillo species have been added to the list of known species for the country. Herein, we add two new species of marsupials to the fauna of Paraguay, Philander opossum and Cryptonanus unduaviensis. These records improve the understanding of both species in South America. The Paraguayan records of P. opossum, corresponding to the subspecies Philander opossum canus, fill in a major gap in its known distribution between Bolivia and Argentina, while the record of C. unduaviensis accounts for an extension of at least 290 km toward the southeast and is the first record reported outside of Bolivia. These two new species increase the known Paraguayan marsupial fauna to 18 species.

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Patterns of small mammal diversity in fragments of subtropical Interior Atlantic Forest in eastern Paraguay

Abstract: The deforestation of eastern Paraguay is a relatively recent phenomenon, starting as early as the 1940s.

Cited by 22 publications

References 47 publications

Metacommunity structure in a highly fragmented forest: has deforestation in the Atlantic Forest altered historic biogeographic patterns?

Metacommunity structure in a highly fragmented forest: has deforestation in the Atlantic Forest altered historic biogeographic patterns?

Description of Litomosoides ysoguazu n. sp. (Nematoda, Onchocercidae), a parasite of the tuft-toed rice rat Sooretamys angouya (Fischer) (Rodentia: Cricetidae), and a first record of L. esslingeri Bain, Petit & Berteaux, 1989 in Paraguay

Additions to the Paraguayan mammal fauna: the first records of two marsupials (Didelphimorphia, Didelphidae) with comments on the alpha taxonomy of Cryptonanus and Philander

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