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Trophic structure of frog assemblages in coastal habitats in southern Brazil
Austral Ecology ( IF 1.5 ) Pub Date : 2020-07-06 , DOI: 10.1111/aec.12920
Sônia Huckembeck 1 , Kirk O. Winemiller 2 , Daniel Loebmann 3 , Alexandre M. Garcia 1
Affiliation  

We evaluated the hypothesis that contrasting environmental conditions in a coastal wetland and nearby sand dunes results in frog assemblages with divergent trophic structures. We predicted that the more productive habitat (wetland) would have higher diversity of primary producers and frogs with larger trophic niches and greater interspecific dietary overlap when compared to the less‐productive dune habitat. Stomach content analysis (SCA) and stable isotope analysis (SIA) were used to compare frog trophic ecology in the two habitats. We compared trophic niche size (Shannon’s index) and overlap (Pianka’s index; isotopic ellipse area, SEAc). Bayesian isotope mixing models were used to estimate relative contributions of basal production sources to frog biomass in each habitat. Estimates indicated that wetland frogs assimilated material from diverse basal sources (suspended particulate organic matter (POM), C3 plants, periphyton), whereas frogs inhabiting dunes assimilated material mostly originating from C3 plants. Both SCA and SIA revealed less trophic overlap among frogs from the sand dunes compared with those from the wetland. Dietary overlap was greater than expected at random for frogs in both the wetland and dunes. Mean overlap among isotopic ellipses (SEAc) of all frogs at each habitat was higher in the wetland (0.14‰) than in the dunes (0.04‰). These findings corroborate our prediction that trophic structure in the wetland is more complex than in the sand dunes. Also, as expected, we observed greater isotopic niche segregation among frogs in the sand dunes, a potential mechanism that reduces competition for limited food resources.

中文翻译:

巴西南部沿海生境中青蛙组合的营养结构

我们评估了这样一个假设:在沿海湿地和附近的沙丘中形成对比的环境条件会导致青蛙组合具有不同的营养结构。我们预测,与低产沙丘生境相比,高产生境(湿地)具有更大的营养位和更大的种间饮食重叠的初级生产者和青蛙将具有更高的多样性。胃内容物分析(SCA)和稳定同位素分析(SIA)用于比较两个栖息地的青蛙营养生态。我们比较了营养小生境的大小(香农指数)和重叠(Pianka指数;同位素椭圆面积,SEA c)。贝叶斯同位素混合模型用于估计每个生境中基础生产源对青蛙生物量的相对贡献。估计表明,湿地青蛙吸收了来自各种基础来源的物质(悬浮颗粒有机物(POM),C 3植物,附生植物),而居住在沙丘中的青蛙吸收了大部分来自C 3的物质植物。与湿地相比,SCA和SIA都显示沙丘蛙的营养重叠较少。在湿地和沙丘中,青蛙的饮食重叠都比随机预期的要大。在湿地(0.14‰)中,所有栖息地的所有青蛙的同位素椭圆(SEAc)之间的平均重叠都高于沙丘(0.04‰)。这些发现证实了我们的预测,即湿地的营养结构比沙丘复杂。此外,正如预期的那样,我们观察到沙丘中的青蛙之间存在更大的同位素生态位隔离,这是一种减少有限食物资源竞争的潜在机制。
更新日期:2020-07-06
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