稳定同位素分析揭示了墨西哥南部濒临灭绝的中美洲河龟的种间和种内营养关系

IF 2 4区 环境科学与生态学 Q2 LIMNOLOGY
Eduardo Reyes-Grajales , Matteo Cazzanelli , Nora P. López-León , Alejandra Sepúlveda-Lozada , Luis Antonio Muñoz Alonso , Miriam Soria-Barreto , Rocío Rodiles-Hernández
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引用次数: 0

摘要

营养生态学研究增强了我们对群落和生态系统中物种关系的理解,为濒危物种保护计划提供了重要信息。中美洲河龟(Dermatemys mawii)是世界上最濒危的龟类物种之一,但对其营养生态学的研究很少。基于稳定同位素分析(δ13C和δ15N),我们应用群落尺度和稳定同位素混合模型,评估了墨西哥南部牛轭湖马氏螯虾同位素生态位在不同年龄和性别类别间的变化、与优势鱼类的种间关系以及基础资源对特定水生消费者的相对贡献。社区范围内的指标表明,与成虫相比,无论性别,马威d.m iwii幼虫消耗了更多种类的食物资源和/或获得了更多种类的栖息地。通过混合模型,我们发现水生植物是雌成虫的主要食物来源,而滨水植物对幼鱼和雄成虫更为重要,提示种内生态位分配。我们还发现了龟和鱼的不同能量途径,龟依赖于维管植物(包括河岸和水生植物),而鱼主要依赖于松本植物。我们的研究结果表明,马氏线虫可能在营养循环中发挥重要作用,并可能调节研究地点自由漂浮的大植物P. stratiotes的存在。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Stable isotope analysis reveals inter- and intraspecific trophic relationships of the endangered Central American river turtle in southern Mexico
Trophic ecology studies enhance our understanding of species relationships within communities and ecosystems, providing critical information for conservation programs targeting endangered species. The Central American river turtle (Dermatemys mawii) is one of the most critically endangered testudine species worldwide, yet its trophic ecology has been scarcely studied. Based on stable isotope analysis (δ13C and δ15N), we applied community-wide metrics and stable isotope mixing models to assess the intraspecific variation in the isotopic niche of D. mawii among different age and sex categories, its interspecific relationships with dominant fish species, and the relative contribution of basal resources to selected aquatic consumers in an oxbow lake in southern Mexico. The community-wide metrics suggested that D. mawii juveniles consumed a greater variety of food resources and/or had access to a wider variety of habitats than adults, regardless of sex. Through the mixing models we detected that the aquatic plant Pistia stratiotes was the main dietary source for adult females, while riparian plants were more important for juveniles and adult males, suggesting intraspecific niche partitioning. We also identified distinct energy pathways for D. mawii and fish, with turtles relying on vascular plants (both riparian and aquatic) while fish primarily depended on seston. Our findings suggest that D. mawii may play an important role in nutrient cycling and potentially regulate the presence of the free-floating macrophyte P. stratiotes at the study site.
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来源期刊
Limnologica
Limnologica 环境科学-湖沼学
CiteScore
3.70
自引率
5.90%
发文量
64
审稿时长
3 months
期刊介绍: Limnologica is a primary journal for limnologists, aquatic ecologists, freshwater biologists, restoration ecologists and ecotoxicologists working with freshwater habitats.
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