Pires Mateus Marques, Kotzian Carla Bender, Spies Marcia Regina
Programa de Pós-graduação em Biologia, Escola Politécnica, Universidade do Vale do Rio dos Sinos, Avenida Unisinos, 950, CEP 93022-000, São Leopoldo, Rio Grande do Sul, Brazil
Departamento de Biologia e Programa de Pós-graduação em Biodiversidade Animal, Universidade Federal de Santa Maria, campus Sede, Avenida Roraima, 1000, CEP 97105-900, Santa Maria, Rio Grande do Sul, Brazil.
J Insect Sci. 2014 Jan 1;14. doi: 10.1093/jisesa/ieu137. Print 2014.
Farm ponds help maintain diversity in altered landscapes. However, studies on the features that drive this type of property in the Neotropics are still lacking, especially for the insect fauna. We analyzed the spatial and temporal distribution of odonate larval assemblages in farm ponds. Odonates were sampled monthly at four farm ponds from March 2008 to February 2009 in a temperate montane region of southern Brazil. A small number of genera were frequent and accounted for most of the dominant fauna. The dominant genera composition differed among ponds. Local spatial drivers such as area, hydroperiod, and margin vegetation structure likely explain these results more than spatial predictors due to the small size of the study area. Circular analysis detected seasonal effect on assemblage abundance but not on richness. Seasonality in abundance was related to the life cycles of a few dominant genera. This result was explained by temperature and not rainfall due to the temperate climate of the region studied. The persistence of dominant genera and the sparse occurrence of many taxa over time probably led to a lack in a seasonal pattern in assemblage richness.
农田池塘有助于维持景观变化地区的生物多样性。然而，关于驱动新热带地区此类特性的特征的研究仍然缺乏，尤其是针对昆虫动物群的研究。我们分析了农田池塘中豆娘幼虫群落的时空分布。2008年3月至2009年2月期间，在巴西南部的一个温带山区，每月对四个农田池塘中的豆娘进行采样。少数属较为常见，且构成了大部分优势动物群。优势属的组成在不同池塘间存在差异。由于研究区域面积较小，诸如面积、水周期和边缘植被结构等局部空间驱动因素可能比空间预测因子更能解释这些结果。循环分析检测到群落丰度存在季节性影响，但丰富度不存在季节性影响。丰度的季节性与少数优势属的生命周期有关。由于所研究区域的温带气候，这一结果是由温度而非降雨导致的。优势属的持续性以及许多分类单元随时间的稀疏出现可能导致群落丰富度缺乏季节性模式。
