TY - JOUR
T1 - Metacommunity structure of small mammals in Western Mexico
T2 - Is the san pedro-mezquital river a biological corridor?
AU - López-González, Celia
AU - Lozano, Abraham
PY - 2015/12/1
Y1 - 2015/12/1
N2 - We analyzed the metacommunity structure of volant and nonvolant small-mammal assemblages along the San Pedro-Mezquital River to provide insights on its role as a biological corridor connecting the eastern and western versants of the Sierra Madre Occidental. Because the river bed descends from 1,800 m to sea level, and from arid to tropical environments, we expected high species turnover and significant relationships of species composition with the vegetation and elevation. Different metacommunity structures were identified for volant (Gleasonian) and nonvolant (quasi-Gleasonian) mammals; i.e., species along the gradient replace each other, but replacement is not by groups but rather species respond idiosyncratically to local environment. We found no significant relationship between species composition and vegetation or elevation, likely because mammals that would otherwise be confined to one vegetation type can occur here in more than one, probably tracking specific resources along the elevation-vegetation gradient. Results support the hypothesis that it is not species richness in itself that accounts for the high biodiversity in Mexico but rather the high environmental heterogeneity that in turn produces high species turnover rates at relatively low scales.
AB - We analyzed the metacommunity structure of volant and nonvolant small-mammal assemblages along the San Pedro-Mezquital River to provide insights on its role as a biological corridor connecting the eastern and western versants of the Sierra Madre Occidental. Because the river bed descends from 1,800 m to sea level, and from arid to tropical environments, we expected high species turnover and significant relationships of species composition with the vegetation and elevation. Different metacommunity structures were identified for volant (Gleasonian) and nonvolant (quasi-Gleasonian) mammals; i.e., species along the gradient replace each other, but replacement is not by groups but rather species respond idiosyncratically to local environment. We found no significant relationship between species composition and vegetation or elevation, likely because mammals that would otherwise be confined to one vegetation type can occur here in more than one, probably tracking specific resources along the elevation-vegetation gradient. Results support the hypothesis that it is not species richness in itself that accounts for the high biodiversity in Mexico but rather the high environmental heterogeneity that in turn produces high species turnover rates at relatively low scales.
UR - http://www.scopus.com/inward/record.url?scp=84975754666&partnerID=8YFLogxK
U2 - 10.1894/0038-4909-60.4.327
DO - 10.1894/0038-4909-60.4.327
M3 - Artículo
SN - 0038-4909
VL - 60
SP - 327
EP - 335
JO - Southwestern Naturalist
JF - Southwestern Naturalist
IS - 4
ER -