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首页> 外文期刊>Canadian Journal of Zoology >Foraging strategies of sympatric lagomorphs: implications for differential success in fragmented landscapes
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Foraging strategies of sympatric lagomorphs: implications for differential success in fragmented landscapes

机译：同胞象形文字的觅食策略：对零散景观的不同成功的启示

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In recent decades, the distribution of New England cottontails (Sylvilagus transitionalis) has declined substantially in response to forest maturation and fragmentation. Populations of eastern cottontails (Sylvilagus floridanus) have expanded into the range of S. transitionalis, since they are apparently less affected by the consequences of habitat modifications. We suspected that S. floridanus was able to exploit small patches of habitat where S. transitionalis was vulnerable to intense predation and we evaluated this explanation using large enclosures within which we manipulated the quality and distribution of food in relation to escape cover. In trials with low-quality food in cover and high-quality food in open areas, S. transitionalis sacrificed food quality for safety by remaining in close proximity to cover. Sylvilagus floridanus avoided low-quality food in cover and foraged at sites containing high-quality food away from cover. When food was removed from cover, S. transitionalis was reluctant to forage in the open and lost a greater proportion of body mass and succumbed to higher rates of predation than did S. floridanus. We applied these results to patterns of foraging by free-ranging rabbits in a fragmented landscape and estimated that S. transitionalis could successfully exploit only 32% of the available habitat without experiencing elevated rates of predation, whereas S. floridanus could exploit 99% of the habitat. Thus, the consequences of habitat fragmentation (especially higher predation risk) may not be as detrimental to S. floridanus, and this species will likely persist, whereas populations of S. transitionalis will continue to decline. [References: 39]
机译：近几十年来，由于森林的成熟和破碎，新英格兰棉尾（Sylvilagus transitionalis）的分布已大大减少。东部棉尾（Sylvilagus floridanus）的种群已经扩展到过渡链球菌（S.transitionalis）的范围，因为它们显然受到栖息地改造后果的影响较小。我们怀疑S. floridanus能够利用小片栖息地，其中S.transalisalis容易受到强烈捕食，并且我们使用大围墙评估了这种解释，在大围墙中我们操纵了与逃生掩盖有关的食物的质量和分布。在低质量食物被覆和高品质食物在开阔地带的试验中，移栖沙门氏菌为了保持安全性而牺牲了食物质量，原因是要保持紧靠覆盖物。 Sylvilagus floridanus避免了掩蔽的劣质食物，并在远离掩蔽的高质量食物的地方觅食。当从掩体中取出食物时，移栖链球菌不愿在野外觅食，失去的体重比例更大，并且比弗洛里丹链球菌更容易捕食。我们将这些结果应用于在零散的景观中自由放养的兔子进行觅食的模式，并估计移栖链球菌仅能成功利用32％的可用栖息地而不会出现捕食率升高的情况，而弗洛里达纳氏菌能利用99％的捕食能力。栖息地。因此，生境破碎化的后果（尤其是更高的捕食风险）可能不会对弗洛里达链球菌有害，并且该物种可能会持续存在，而过渡链球菌的种群将继续下降。 [参考：39]

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