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2015 ; 10
(4
): e0123220
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Sharing the space: distribution, habitat segregation and delimitation of a new
sympatric area of subterranean rodents
#MMPMID25856399
Kubiak BB
; Galiano D
; de Freitas TR
PLoS One
2015[]; 10
(4
): e0123220
PMID25856399
show ga
Subterranean rodents of the genus Ctenomys usually present an allopatric or
parapatric distribution. Currently, two cases of sympatry have been recognized
for the genus in the coastal dunes of southern Argentina and southern Brazil. In
this context, they are ideal models to test hypotheses about the factors that
delimit the patterns of space use and to understand interspecific interactions in
small mammals. We investigated the vegetation structure, plant biomass and soil
hardness selected by two species of subterranean rodents (Ctenomys flamarioni and
C. minutus) when distributed in sympatry and allopatry from nine different areas
along the line of coastal dunes in southern Brazil. In addition, our work
presents a new record of a third area of sympatry for the genus Ctenomys.
Ctenomys flamarioni and C. minutus show habitat segregation in the area where
they occur in sympatry. These species show segregation in their selection of
microhabitats, differing in relation to soil hardness, plant biomass, and plant
cover. Ctenomys flamarioni showed a distinction in habitat selection when
occurring in allopatry and sympatry, whereas C. minutus selected the same habitat
characteristics under both conditions. A possible explanation to the observed
pattern is that these species have acquired different adaptations over time which
allows them the ability to exploit different resources and thus avoid competitive
interactions all together.
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