Patch occupancy in the endangered butterfly Lycaena helle in a fragmented landscape: effects of habitat quality, patch size and isolation
Patch occupancy in the endangered butterfly Lycaena helle in a fragmented landscape: effects of habitat quality, patch size and isolation
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DOI：
10.1007/s10841-008-9166-1
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发表时间：
2009-06-01
影响因子：
1.9
通讯作者：
Fischer, Klaus
中科院分区：
文献类型：
--
作者：
Bauerfeind, Stephanie S.;Theisen, Anett;Fischer, Klaus
虽然人们一致认为生境质量和生境网络特征（如斑块大小和隔离程度）都有助于任何特定物种对斑块的占用，但这些因素的相对重要性仍存在争议。这个问题具有根本的生态学重要性，而且是旨在保护濒危物种的保护生物学家特别关注的问题。在此背景下，我们调查了中欧最稀有的蝴蝶品种之一紫铜Lycaena helle在Westerwald地区（德国西部莱茵兰-普法尔茨）的斑块占用情况。被占用斑块（n = 102）与空白斑块（n = 128）在海拔、大小、连通性、风挡物的可用性、幼虫寄主植物的丰度、表明有利生境条件的禾草物种的丰度以及亲氮植物的丰度等方面存在差异。总体而言，斑块占用率主要由斑块大小、连通性和寄主植物的丰度决定，其他生境质量参数的重要性都较低。因此，我们的研究结果表明，即使对于像L. helle这样极度定居的物种，栖息地网络也是决定性的，并且仅次于栖息地质量的保护，需要成为该物种保护管理的一个组成部分。
While there is agreement that both habitat quality and habitat network characteristics (such as patch size and isolation) contribute to the occupancy of patches by any given species, the relative importance of these factors is under debate. This issue is of fundamental ecological importance, and moreover of special concern for conservation biologists aiming at preserving endangered species. Against this background we investigated patch occupancy in the violet copper Lycaena helle, one of the rarest butterfly species in Central Europe, in the Westerwald area (Rhineland-Palatinate, Western Germany). Occupied (n = 102) differed from vacant (n = 128) patches in altitude, size, connectivity, availability of wind shelter, in the abundance of the larval host-plant, in the abundance of a grass species indicating favorable habitat conditions and in the abundance of nitrophilous plants. Overall, patch occupancy was primarily determined by patch size, connectivity and the abundance of the larval host plant, while all other parameters of habitat quality were of subordinate importance. Therefore, our findings suggest that even for extremely sedentary species such as L. helle habitat networks are decisive and-next to the preservation of habitat quality-need to be an integral part of any conservation management for this species.