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首页> 外文期刊>Marine ecology progress series >Geospatial analysis of habitat use in yellowtail flounder Limanda ferruginea on Georges Bank
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Geospatial analysis of habitat use in yellowtail flounder Limanda ferruginea on Georges Bank

机译：乔治银行黄尾比目鱼Limanda ferruginea栖息地利用的地理空间分析

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Three theories of habitat use proposed for marine fishes - the constant density model, the proportional density model, and the basin model-make contrasting predictions of how the geographical range, local density, and fitness change as population size changes. We tested model predictions with survey data on yellowtail flounder Limanda ferruginea from the Georges Bank region, where abundance changed by a factor of 4 over a decade. Surveys took place in spring and fall, and data on individual length, mass, sex, and reproductive status were available. Analysis of spatial pattern revealed that the overall area occupied by flounder increased by a factor of 2 when abundance was high, and local density increased predominantly in high quality habitat that had been closed to commercial fishing. Condition, which served as a proxy for fitness, was lower in females when abundance was high. Geospatial analysis revealed mesoscale variability in condition, over 10s to >100 km, except in the spring season during low abundance periods. Spatial autocorrelation explained as much as 25% of the variability in condition, indicating that site dependence was a factor in explaining the spatial distribution that we observed. These results are most supportive of both the constant density model and the basin model. This approach detected an important population center for yellowtail flounder and determined its extent using only measures of abundance, location, and condition of individual fish, data commonly collected during routine fishery assessment surveys. Here we demonstrate that analyses linking population responses to variation in such measures at local spatial scales can have significant implications for identifying areas of important fish habitat and suggest greater use of geospatial approaches in conservation and management of exploited species.
机译：提出了三种用于海洋鱼类的栖息地使用理论-恒定密度模型，比例密度模型和流域模型-对地理范围，局部密度和适应度随种群大小的变化如何进行预测。我们用来自乔治斯银行地区的tail鱼比目鱼Limanda ferruginea的调查数据测试了模型预测，该区域的丰度在十年中变化了4倍。在春季和秋季进行了调查，并提供了有关个体长度，体重，性别和生殖状况的数据。空间格局分析表明，高丰度时，比目鱼所占的总面积增加了2倍，而在禁止商业捕鱼的高质量栖息地中，局部密度主要增加了。当丰度较高时，女性的状况较低，可以作为健身的代表。地理空间分析显示，中景尺度的变化在10s到> 100 km的范围内，除了春季，在低丰度时期除外。空间自相关解释了条件变化的25％，这表明位点依赖性是解释我们观察到的空间分布的一个因素。这些结果最支持恒定密度模型和盆地模型。这种方法发现了一条重要的yellow鱼种群中心，仅通过单条鱼的丰度，位置和状况的测量（常规渔业评估调查中通常收集的数据）来确定其范围。在这里，我们证明，将种群反应与此类措施在当地空间尺度上的变化联系起来的分析对识别重要的鱼类栖息地具有重要意义，并建议在保护和管理被开发物种中更多地利用地理空间方法。

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