Huckembeck S, Claudino M, Correa F, Bastos R F, Loebmann D, Tozetti A M, Garcia A M
Lababoratório de Ictiologia, Instituto de Oceanografia, Universidade Federal do Rio Grande, Rio Grande, RS, Brazil.
Braz J Biol. 2012 May;72(2):331-6. doi: 10.1590/s1519-69842012000200014.
Pseudis minuta is abundant in a variety of aquatic environments of the Pampa domain. Therefore, it can be considered a good model for testing hypotheses on environmental heterogeneity and the influence of climate on the activity of anurans. In this study, we examined the spatial distribution pattern of P. minuta in terms of microhabitats and the influence of abiotic factors on seasonal fluctuations in the abundance of this species. Samples were collected monthly from April 2008 to May 2009 in wetlands and coastal dunes in the Lagoa do Peixe National Park. A total of 112 specimens of P. minuta were collected, of which 45 were found in the wetland area and 67 in the dune area. The species showed seasonal fluctuation in abundance, and it was most abundant in months with higher temperatures (spring-summer). Pseudis minuta was mainly associated with aquatic vegetation, an expected pattern in terms of their morphological adaptations to this environment. Among the abiotic parameters analyzed, only the monthly mean temperature showed a significant correlation (p < 0.05; r = 0.67) with the abundance of P. minuta. We concluded that P. minuta is a generalist species with respect to microhabitat use and also that fluctuation in its population abundance is mainly associated with seasonal variation in temperature.
小南美牛蛙在潘帕斯地区的各种水生环境中数量众多。因此，它可被视为一个用于检验关于环境异质性以及气候对无尾目动物活动影响的假设的良好模型。在本研究中，我们从微生境角度研究了小南美牛蛙的空间分布模式以及非生物因素对该物种数量季节性波动的影响。从2008年4月至2009年5月，每月在佩克西泻湖国家公园的湿地和海岸沙丘采集样本。总共采集到112只小南美牛蛙标本，其中45只在湿地地区发现，67只在沙丘地区发现。该物种数量呈现季节性波动，在温度较高的月份（春夏）最为丰富。小南美牛蛙主要与水生植被相关联，就其对该环境的形态适应而言，这是一种预期模式。在所分析的非生物参数中，只有月平均温度与小南美牛蛙的数量呈现显著相关性（p < 0.05；r = 0.67）。我们得出结论，小南美牛蛙在微生境利用方面是一个泛化种，并且其种群数量波动主要与温度的季节性变化相关。
