生境变化
Lack of dry season rainfall, coupled with competition for grazing at the ephemeral wetland boundary, and an increase in predation pressure could have provided a trigger for the decline of roan earlier than the general broad scale habitat deterioration of the northern plains landscape.
旱季降雨的缺乏,加上沼泽边界区域采食竞争以及天敌捕食压力,是引发马羚在北部平原生境普遍退化之前其种群提前下降的因素[动物学报52(2):406-4092006]。
Broadly described, drought, associated habitat deterioration and concomitant competition for grazing by generalist herbivores were possible hypotheses explaining the decline of the roan population.
干旱和由此导致的生境退化以及随之产生的食草动物之间的采食竞争是解释马羚种群数量下降的可能假说。
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