INTRASPECIFIC VARIATION IN DIET WITHIN AND BETWEEN TROPHIC MORPHS IN LARVAL TIGER SALAMANDERS (AMBYSTOMA-TIGRINUM-NEBULOSUM)
INTRASPECIFIC VARIATION IN DIET WITHIN AND BETWEEN TROPHIC MORPHS IN LARVAL TIGER SALAMANDERS (AMBYSTOMA-TIGRINUM-NEBULOSUM)
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DOI：
10.1139/z84-027
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发表时间：
1984-01-01
影响因子：
1.4
通讯作者：
HOLOMUZKI, JR
中科院分区：
文献类型：
--
作者：
COLLINS, JP;HOLOMUZKI, JR
星云甲藻幼虫是二态的。与典型的幼虫相比，宽头变种是食人的，头部更宽，犁齿更大。从美国亚利桑那州的4个栖息地采集了幼虫，以量化相对栖息地的种类内和种类之间的食物变化，以及1个生境的典型种类的食物相对于年龄的变化。两性都有宽头或食人的变种，它们的大部分食物(.hivin.x=84%)是其他火蜥蜴。各种无脊椎动物构成了它们剩余的食物。典型的变种主要以大型脊椎动物和浮游生物为食，很少(分析170条幼虫中的1条)同种生物。与年龄较大的幼虫相比，年轻的典型幼虫捕食的猎物范围较小，主要是浮游生物，而年长的幼虫除了捕食浮游生物外，还捕食各种大型无脊椎动物。将宽头幼虫描述为食人动物是合理的，因为它们的大部分食物是其他火蜥蜴；典型的火蜥蜴很少吃火蜥蜴。这两种变种也吃无脊椎动物。关于虎纹夜蛾幼虫的饮食，同类与典型是指一种偏好，而不是一个绝对的分类。
Larvae of A. t. nebulosum are dimorphic. The broad-headed morph is cannibalistic and has a wider head and enlarged vomerine teeth compared with typical larvae. Larvae were collected from 4 habitats in Arizona, USA, to quantify how diet varies within and between morphs relative to habitat, and how diet varies relative to age in typical morphs from 1 habitat. Broad-headed or cannibalistic morphs occurred in both sexes and most of their diet (.hivin.x = 84%) was other salamanders. A variety of invertebrates comprised the remainder of their diet. Typical morphs ate primarily macronivertebrates and plankton, and rarely (1 of 170 larvae analyzed) conspecifics. Young typical larvae consumed a narrow range of prey, mostly plankton, compared with older larvae, which consumed a diversity of macroinvertebrates in addition to plankton. Description of broad-headed larvae as cannibals is justified because most of their diet is other salamanders; typical morphs rarely eat salamanders. Both morphs also eat invertebrates. With regard to diet in larval A. tigrinum, cannibalistic vs. typical refers to a predilection and is not an absolute categorization.