Seasonal Diet Variations of the Sand Lizard (Lacerta agilis) (Lacertidae, Reptilia) in the Northern Lower-Volga Region

Q4 Environmental Science

Povolzhskii ekologicheskii zhurnal Pub Date : 2020-01-01 DOI:10.35885/1684-7318-2019-3-396-401

G. Shlyakhtin, V. Tabachishin, M. V. Yermokhin

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Abstract

The feeding of Lacerta agilis was studied by means of the content analysis of lizards' stomachs conducted in the vicinity of Saratov City from April till September 1983, 2003 and 2007. The maximum daily diet was characteristic in July and reached 2.5–2.7 g/day, while the minimum one was in April and September (1.1–1.2 g/day). The highest and lowest numbers of food objects were recorded in May and September, respectively. Insects are the basic food objects of L. agilis, their occurrence frequency being 100% during the whole active-life period. Coleoptera representatives predominated in the diet (25.4–40.5% by number, 43.5–70.9% by weight). The fractions of Lepidoptera, Hymenoptera, Diptera, etc. were somewhat lower. Well-flying and quickly-moving insects predominated in the food spectrum of L. agilis. Rather many invertebrates with cryptic colour, poisonous, stinging and badly smelt ones were frequently met among the nutrition objects. Moreover, vegetable remains (seeds, leaves, flower fragments etc.) and various small stones to act probably as gastrolytes were found in many stomachs.

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下伏尔加河北部地区沙蜥(Lacerta agilis)(蜥科，爬行纲)的季节性饮食变化

本文于1983年4月至9月、2003年和2007年3月在萨拉托夫市附近进行了蜥蜴胃标本含量分析，研究了敏捷蜥蜴的摄食情况。日采食量的最大值以7月为特征，达到2.5 ~ 2.7 g/d，最小值为4月和9月(1.1 ~ 1.2 g/d)。食物物体的最高数量和最低数量分别记录在5月和9月。昆虫是敏捷乳杆菌的基本食物对象，在整个活动期内昆虫的出现频率为100%。鞘翅目代表在日粮中占绝对优势(数量25.4 ~ 40.5%，重量43.5 ~ 70.9%)。鳞翅目、膜翅目、双翅目等占比较低。飞得好、行动快的昆虫在敏捷乳杆菌的食谱中占主导地位。在营养对象中，经常会遇到许多颜色神秘、有毒、有刺、气味难闻的无脊椎动物。此外，在许多胃中还发现了蔬菜残留物(种子、叶子、花碎片等)和各种可能作为胃解液的小结石。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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