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A multidisciplinary approach to assessing the sustainability of freshwater crayfish harvesting in Madagascar

机译：评估马达加斯加淡水小龙虾捕捞可持续性的多学科方法

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摘要

There is growing interest among conservation decision markers in promoting harvesting of forest products as an incentive for communities to retain forest coven Assessments of the sustainability of existing harvests arc, essential for implementing such policies. Madagascars endemic freshwater crayfish, Astacoides spp., are harvested throughout Their range. Despite their importance to human communities, Madagascar's crayfish, like much of the island's freshwater biodiversity are poorly known, and there is concern that the harvest may be unsustainable. We investigated sustainability of the crayfish harvest in and around Ranomafana National Park in eastern Madagascar, focusing on the heavily harvested. A. granulimanus. Several villages around the park, have traditional taboos against-selling crayfish, resulting tit widely varying levels of crayfish exploitation. We used two approaches to assess sustainability of the harvest First we used participatory mapping combined with a geographic information system analysis to produce a spatially accurate map of harvesting intensity. We then carried out mark-and-recapture sampling at 74 sites across a range of harvest intensities to test whether the level of harvesting wets a significant predictor of crayfish density and structure. Second, we used size-structured matrix population models to estimate the forest area necessary to provide the observed annual harvest from one harvesting village and compared this estimate with the area available to the harvester,,;. Our findings show that the crayfish harvest in Ranomafana may be sustainable under current socioeconomic conditions, suggesting that A. granulimanus is less vulnerable to overexploitation. than previously thought We emphasize the importance of a multidisciplinary approach to assessing sustainability involving both ecological information about the harvested species and socioeconomic data about The level and spatial pattern of the harvest.
机译：在保护性决策指标中，人们越来越关注促进森林产品的采伐，以激励社区保留森林之谷。对现有采伐的可持续性进行评估对于实施此类政策至关重要。马达加斯加特有的淡水小龙虾Astacoides spp。，在其整个捕捞范围内都有收获。尽管马达加斯加的小龙虾对人类社区具有重要意义，但与该岛许多淡水生物多样性一样，鲜为人知，人们担心其收成可能不可持续。我们调查了马达加斯加东部Ranomafana国家公园及其周围地区小龙虾收获的可持续性，重点是收获量大。 A. granulimanus。公园周围的几个村庄都有传统的禁忌，禁止出售小龙虾，导致对小龙虾的开采水平差异很大。我们使用了两种方法来评估收成的可持续性。首先，我们将参与式制图与地理信息系统分析相结合，以产生空间精确的收割强度图。然后，我们在一系列捕捞强度范围内的74个地点进行了标记捕捞采样，以测试捕捞水平是否能充分预测小龙虾的密度和结构。其次，我们使用大小结构矩阵人口模型来估算提供一个收割村的年度收成所必需的森林面积，并将此估计值与收割者可用的面积进行比较。我们的发现表明，在当前的社会经济条件下，拉诺法玛纳小龙虾的收成可能是可持续的，这表明A. granulimanus不太容易受到过度开发的影响。比以前认为的要多。我们强调采用多学科方法评估可持续性的重要性，其中涉及有关收获物种的生态信息和有关收获水平和空间格局的社会经济数据。

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