Influence of Life History Traits on Trophic Niche Segregation between Two Similar Sympatric Tupinambis Lizards

被引：10
作者：
Lopez Juri, Guadalupe [1 ,2 ]
Naretto, Sergio [1 ,2 ]
Carolina Mateos, Ana [3 ,4 ]
Chiaraviglio, Margarita [1 ,2 ]
Cardozo, Gabriela [1 ,2 ]
机构：
[1] Univ Nacl Cordoba, Inst Diversidad & Ecol Anim, Consejo Nacl Invest Cient & Tecn, X5000JJC Ave Velez Sarsfield 299, RA-5000 Cordoba, Argentina
[2] Univ Nacl Cordoba, Fac Ciencias Exactas Fis & Nat, Lab Biol Comportamiento, RA-5000 Cordoba, Argentina
[3] Univ Nacl Cordoba, Inst Multidisciplinario Biol Vegetal, Consejo Nacl Invest Cient & Tecn, RA-5000 Cordoba, Argentina
[4] Univ Nacl Cordoba, Fac Ciencias Exactas Fis & Nat, Area Contaminac & Bioindicadores, RA-5000 Cordoba, Argentina
来源：
SOUTH AMERICAN JOURNAL OF HERPETOLOGY | 2015年 / 10卷 / 02期
关键词：
Activity pattern; Body size; Feeding ecology; Phenotypic traits; Sexual dimorphism; Squamata; Sympatry; Trophic niche overlap; BODY-SIZE; TROPIDURUS-TORQUATUS; FORAGING BEHAVIOR; CORDOBA PROVINCE; FEEDING ECOLOGY; CAATINGA AREA; AMEIVA-AMEIVA; BITE-FORCE; DIET; FOREST;
D O I：
10.2994/SAJH-D-15-00002.1
中图分类号：
Q95 [动物学];
学科分类号：
071002 ;
摘要：
Segregation of habitat resources is an important mechanism that allows the coexistence of species. The diet is an important and dynamic component that can generate interactions among co-existing species. Differences in food resource use between related sympatric species have been associated frequently with divergence in multiple phenotypic traits; hence, it is interesting to explore how phenotypic differences allow sympatric species to minimize niche overlap. We aimed to evaluate trophic niche segregation between Tupinambis merianae and T. rufescens in relation to life history traits in a sympatric zone. We compared the volume of the stomach food items between species considering sexual dimorphism, body size classes, sexual maturity and reproductive activity. The obtained Morisita's index indicated trophic niche overlap between T. merianae and T. rufescens; however, considering particular food items, we observed differences in diet composition. Moreover, our results indicate that body size, sexual maturity and reproductive activity are relevant factors influencing the diet of these species. Life history traits of these two species of Tupinambis are important because they shape diet composition, contributing to interspecific segregation of the trophic niche and, therefore, allowing species coexistence.
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收藏
页码：132 / 142
页数：11
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