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首页> 外文期刊>Conservation Biology >Demographic trends and community stability in a montane amphibian assemblage
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Demographic trends and community stability in a montane amphibian assemblage

机译：山地两栖动物组合的人口趋势和社区稳定性

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We conducted a long-term study of a montane amphibian community in Penalara Natural Park ( central Spain ) to analyze population trends. We recorded larval density and number of ponds used for reproduction for nine species in two time periods: 1982-1986 and 1999. We used chi-square analysis to compare the observed ratio of extinctions to colonizations to an expected ratio of 1:1 at the ponds used for reproduction for each species. We also compared larval densities of six species in both time periods. Overall, we found no differences in species composition. However, separate analyses for each of the nine species inhabiting the study area showed that underlying this apparent stability were significant opposite population trends in six species. Three species expanded their ranges, whereas three suffered severe range reductions and population decreases. A chytrid infection was responsible for the decline of Alytes obstetricans , almost extirpated from the surveyed area, whereas less dramatic decreases were observed for Salamandra salamandra and Bufo calamita. Our study emphasizes the need to analyze each species separately to assess the conservation status of amphibian assemblages. In this context, the conservation of endemic species with restricted distribution areas should be considered a priority. [References: 29]
机译：我们对Penalara自然公园（西班牙中部）的山地两栖动物群落进行了长期研究，以分析人口趋势。我们记录了两个时间段（1982-1986年和1999年）中9个物种的幼体密度和繁殖池塘的数量。我们使用卡方分析将观察到的灭绝与定居的比例与预期的1：1进行了比较。每个物种用于繁殖的池塘。我们还比较了两个时期中六个物种的幼虫密度。总体而言，我们发现物种组成没有差异。但是，对居住在研究区域的9个物种中的每个物种进行的单独分析表明，这种明显的稳定性所依据的是与6个物种相反的种群趋势。三个物种扩大了范围，而三个物种则严重缩小了范围并减少了种群。糜蛋白酶感染是导致产线虫数量下降的原因，几乎从调查区域消失，而Sal鱼和Bu蒲的下降幅度较小。我们的研究强调需要分别分析每个物种以评估两栖动物的保护状况。在这种情况下，应将保护分布区域受限的地方物种视为优先事项。 [参考：29]

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