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Influence of microhabitat on the trophic ecology of two leptodactylids from northeastern Argentina

机译：微生物栖息地对阿根廷东北部两个瘦足类细菌的营养生态的影响

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摘要

We analyzed trophic ecology and its relationship with environmental variables for two leptodactylid species, Leptodactylus latinasus and L. bufonius (Anura: Leptodactylidae). The two species are common around Corrientes City, Argentina, where they live in the same habitat. The main objectives were to analyze the diets and patterns of coexistence relative to the microhabitat of each species. Weekly sampling was carried out January 1997-February 2000. A randomization test and canonical correspondence analysis (CCA) were used for data analysis. In L. latinasus, the diet was dominated numerically by isopterans and coleopterans (25.25% and 21.21%, respectively) and volumetrically by insect larvae (37.14%). In L. bufonius, the alimentary contents were dominated numerically by isopterans (60.49%) and volumetrically by coleopterans (62.47%). The trophic niche breadth was wider in L. latinasus (6.55) than L. bufonius (2.44). The overlap in the trophic niche (prey proportion) was higher (O-jk = 0.81) and significantly greater than the expected mean value obtained by chance (0.27). Spatial niche overlap between the two species was low (O-jk = 0.331) and not significantly different than the mean value expected by chance (0.52). Differences in microhabitat use were observed. While L. latinasus showed strong preference for mud, ground with crevices, and short grass and mud, L. bufonius showed preferences for dry land and short grass. In addition, the presence of this species was positively correlated with temperature and rainfall variables. Niche complementarity was observed between these species; although they exhibit high overlap in food, they tended to have low overlap in microhabitat use.
机译：我们分析了两个瘦足种类的营养生态学及其与环境变量的关系，两个物种分别是：Leptodactylus latinasus和L. bufonius（Anura：Leptodactylidae）。这两个物种在阿根廷Corrientes市附近很常见，它们生活在相同的栖息地。主要目标是分析与每种物种的微生境有关的饮食和共存模式。每周抽样于1997年1月至2000年2月进行。数据分析采用随机检验和规范对应分析（CCA）。在拉丁乳杆菌中，饮食在数量上以等翅目和鞘翅目为主（分别为25.25％和21.21％），而按体积计算则以昆虫幼虫（37.14％）为主。在布氏乳杆菌中，营养成分在数量上以等翅目为主（60.49％），而在体积上则以鞘翅目为主（62.47％）。拉丁美洲乳（6.55）的营养生态位宽度比bufonius（2.44）宽。营养生态位的重叠（猎物比例）更高（O-jk = 0.81），并且明显大于偶然获得的预期平均值（0.27）。两种物种之间的空间生态位重叠很低（O-jk = 0.331），与偶然估计的平均值（0.52）没有显着差异。观察到微生境使用的差异。虽然拉丁裔L.表现出对泥浆，带有裂隙的地面以及短草和泥土的强烈偏爱，但bufonius表现出对旱地和短草的偏爱。此外，该物种的存在与温度和降雨变量呈正相关。这些物种之间观察到生态位互补性。尽管它们在食物中表现出高度重叠，但在微栖息地使用中它们往往具有低重叠。

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