Differential effects of climate, environment, and land use on two sympatric species of Akodon

被引:3
|
作者
Polop, Francisco [1 ,2 ]
Cecilia Provensal, Maria [2 ]
Priotto, Jose [1 ,2 ]
Steinmann, Andrea [1 ,2 ]
Polop, Jaime J. [2 ]
机构
[1] Consejo Nacl Invest Cient & Tecn, RA-1033 Buenos Aires, DF, Argentina
[2] Univ Nacl Rio Cuarto, Fac Ciencias Exactas Fis Quim & Nat, Dept Ciencias Nat, Cordoba, Argentina
关键词
agroecosystem; rodent abundance; weather; crops; agricultural practices; Argentina; MICROTINE POPULATION FLUCTUATIONS; RODENT POPULATIONS; INTERSPECIFIC COMPETITION; EXTRA FOOD; DENSITY-DEPENDENCE; AZARAE RODENTIA; FEEDING-HABITS; SMALL MAMMALS; DYNAMICS; PREDATION;
D O I
10.1080/01650521.2012.736730
中图分类号
Q95 [动物学];
学科分类号
071002 ;
摘要
We describe changes in abundance of two rodent species over a 12-year period and assess the relationship between population abundance, climate, and agricultural practices in southern Cordoba Province, Argentina. We estimated abundance from trapping edges of agricultural areas, railway rights of way, and roadsides. Variables considered were: normalized difference vegetation index (NDVI), surface temperature, minimum and maximum temperature, rainfall, and cultivated areas of different crops. Species abundances varied over time; those of Akodon dolores declined, whereas those of A. azarae increased. Climatic and environmental changes may have had differential influences on species abundances. Autumn abundance of A. dolores was positively related to spring rainfall and area of harvested sorghum, and negatively related to NDVI. Akodon azarae abundance was negatively correlated with winter minimum temperature, spring rainfall, and sorghum harvested area, but positively associated with NDVI. On the other hand, both species were negatively correlated with each other. We suggest that environmental conditions may have changed the competition outcome for Akodon spp., and thus, had direct, differential effect on species abundances.
引用
收藏
页码:147 / 156
页数:10
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