Complex effects of climate change: population fluctuations in a tropical rodent are associated with the southern oscillation index and regional fire extent, but not directly with local rainfall
作者： WILLIAM E. MAGNUSSON , VIVIANE M. G. LAYME , ALBERTINA P. LIMA
DOI: 10.1111/J.1365-2486.2009.02140.X
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摘要: We report on the population response of a species rodent, Necromys lasiurus, to southern oscillation index (SOI) and extent regional fire in an Amazonian savanna. Information temporal variation local abundance N. lasiurus 4.0 ha savanna plot was obtained from 1985 1989, 1997 1998 2000-2006, giving data 14 22 years. Throughout this period, rodent density declined by 90%. Densities were positively associated with SOI region. Rainfall related negatively influenced fire. However, amount rain had no measurable direct effect rat densities. Thus, small changes temperature, consequently probability intensity, may have drastic consequences biota savannas, especially El Nino periods.
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