THE SHAPE OF A GERBIL ISOCLINE MEASURED USING PRINCIPLES OF OPTIMAL HABITAT SELECTION

被引:77
作者
ABRAMSKY, Z
ROSENZWEIG, ML
PINSHOW, B
机构
[1] BEN GURION UNIV NEGEV, JACOB BLAUSTEIN INST DESERT RES, MITRANI CTR DESERT ECOL, IL-84105 BEER SHEVA, ISRAEL
[2] UNIV ARIZONA, DEPT ECOL & EVOLUT BIOL, TUCSON, AZ 85721 USA
关键词
GERBILS; ISOCLINE; ISOLEG; ISRAEL; SAND DUNES; SHARED PREFERENCE;
D O I
10.2307/1938926
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
The isoclines of Gerbillus allenbyi competing with G. pyramidum are negatively sloped and at least approximately parallel. They are not linear, however; they are steeper over both low and high G. pyramidum densities and only very slightly negative at intermediate densities. This nonlinearity agrees with the predictions of the theory of optimal density-dependent habitat selection in a two-species, shared-preference system, the system that obtains here. The isocline field was measured by a new method based on the single-species habitat selection theory of Fretwell. The species whose isoclines are being measured (the target species) is given a chance to equilibrate its per capita reproductive rate across a fence that separates two densities of its competitors. Equilibration requires that the target species distribute its density unequally on the two sides of the fence. The general features of the method may be useful in other animal studies where densities can be experimentally manipulated.
引用
收藏
页码:329 / 340
页数:12
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