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首页> 外文期刊>Zoologia (Curitiba) >The effects of seasonality on the foraging behavior of Tropidurus hispidus and Tropidurus semitaeniatus (Squamata: Tropiduridae) living in sympatry in the Caatinga of northeastern Brazil
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The effects of seasonality on the foraging behavior of Tropidurus hispidus and Tropidurus semitaeniatus (Squamata: Tropiduridae) living in sympatry in the Caatinga of northeastern Brazil

机译：季节变化对生活在巴西东北部Caatinga交界处的Tropidurus hispidus和Tropidurus semitaeniatus（Squamata：Tropiduridae）觅食行为的影响

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In this study, we performed field observations of 38 and 84 specimens of the lizards Tropidurus hispidus (Spix, 1825) and Tropidurus semitaeniatus (Spix, 1825), respectively, inhabiting a Caatinga in the state of Rio Grande do Norte, northeastern Brazil, in order to describe the foraging behavior, measure the foraging intensity (number of movements, time spent stationary, distance traveled and number of attacks on preys) and investigate the effects of seasonality on the foraging strategies of these two species of lizards. During the dry season, both species showed no significant differences in foraging intensity. In the wet season, on the other hand, only the distance traveled was similar for both species. Tropidurus semitaeniatus displayed a larger mean number of movements (9.8 ± 1.2) and attacks on preys (1.7 ± 0.3) when compared to T. hispidus (3.0 ± 0.8 moves; 0.3 ± 0.1 attacks). Additionally, mean time spent stationary was significantly longer for T. hispidus (596.6 ± 1.0 seconds) than for T. semitaeniatus (587 ± 2.1 seconds). Results suggest that the low number of movements and short distance traveled (maximum of 1000 cm during 10-minute intervals) are consistent with the categorization of T. hispidus and T. semitaeniatus as sit-and-wait foragers. Given our results, we conclude that both species co-exist under limiting conditions during the dry season, with similar foraging behavior and similar rates of foraging intensity, segregating with respect to these variables in the wet season.
机译：在这项研究中，我们分别对巴西东北部里奥格兰德州的Caatinga居住的蜥蜴Tropidurus hispidus（Spix，1825）和Tropidurus semitaeniatus（Spix，1825）的38个标本进行了实地观察。为了描述觅食行为，测量觅食强度（运动次数，静止时间，行进距离和对猎物的攻击次数），并研究季节性因素对这两种蜥蜴的觅食策略的影响。在干旱季节，两种物种的觅食强度均无显着差异。另一方面，在雨季，两个物种的行进距离相似。与T. hispidus（3.0±0.8动作; 0.3±0.1攻击）相比，Stropidurus semitaeniatus表现出更大的平均移动次数（9.8±1.2）和对猎物的攻击（1.7±0.3）。此外，平均花费时间静止不动的T. hispidus（596.6±1.0秒）比T. semitaeniatus（587±2.1秒）。结果表明，运动次数少和行进距离短（在10分钟的间隔内最大移动1000厘米）与T. hispidus和T. semitaeniatus归为静坐觅食者的分类是一致的。根据我们的结果，我们得出结论，在干旱季节，这两种物种在有限的条件下共存，具有相似的觅食行为和相似的觅食强度比率，在湿季中这些变量相互隔离。

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