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首页> 外文会议>Symposium on Effects of Fishing Activities on Benthic Habitats--Linking Geology, Biology, Socioeconomics, and Management >Linking Fisheries to Benthic Habitats, at Multiple Scales: Eastern Scotian Shelf Haddock
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Linking Fisheries to Benthic Habitats, at Multiple Scales: Eastern Scotian Shelf Haddock

机译：将渔业联系在底栖栖息地，以多种尺度：东斯科特师架子

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Historical distributions (n = 32y) of age-1 juvenile haddock Melanogrammus aeglefinus from the eastern Scotian Shelf population varied linearly with year-class strength, indicating a dependence on demersal habitats. Distributions of haddock ages 2-5were weakly density dependent, indicating weaker associations with benthic habitats. The preferred areas (>75%) of occurrence for age-1 haddock changed with the spatial scale of analysis. As bin size was reduced from 1,342 km2 (400 nm2) to 755 km2 (225 nm2) to 336 km2 (100 nm2) to 84 km2 (25 nm2), the boundaries of preferred areas shifted in location and the total area increased in size. As the spatial scale of bin size was reduced, the frequency of missing data increased, making it difficult to determine the true nature and extent of high-preference areas. The historical data indicated that preferred areas occur at the smallest scale analyzed of approximately 100 km2. Therefore, preferred areas (>75% occurrence) and nonpreferred (<25% occurrence) areas 10 km by 10 km were selected on three banks of differing size for directed studies. Acoustic surveys were carried out in the selected study areas using a normal incidence echosounder to determine fine-scale (16-18 m) bathymetric structure. These areasranged in mean depths from 42 to 84 m. Bathymetric relief (m/km) was always greater in preferred areas within each bank. Spatial auto-correlation of bathymetric relief had smaller de-correlation scales for preferred areas within banks. Preferred areas for age-1 haddock were always more rugged at finer spatial scales than nonpreferred areas, indicating that preferred habitats may be more complex. There was a bank-scale dependency in surface structure where smaller banks were less rugged at finer spatialscales. We hypothesize that there may be a bank-dependent scaling of habitats where larger banks have a greater variety of habitats that span a greater range of spatial scales.
机译：从东部斯科伊氏岛的1年龄-1少年Haddock Melanogramus的历史分布（N = 32Y）宙斯图队与年级阶级的强度相差，表明依赖过度栖息地。皮塔克郡的分布效率为2-5岁的依赖性弱密度，表明较弱的与底栖栖息地的关联。 Ads-1 Baddock发生的优选区域（> 75％）随空间分析的变化。随着箱尺寸从1,342km 2（400nm2）降至755 km2（225 nm2）至336km2（100nm2）至84km 2（25 nm2），所在位置的优选区域的边界，总面积的大小增加。随着箱尺寸的空间尺度减小，缺失数据的频率增加，难以确定高偏好区域的真实性质和程度。历史数据表明，优选的区域以约100km2分析的最小规模发生。因此，在三个不同规模的指导研究的不同尺寸的三岸上选择了10公里10公里的优选区域（> 75％发生）和非活动（<25％的发生）区域。使用正常发病率回波器在所选研究区域中进行声学调查，以确定细量（16-18米）的碱基结构。这些区域的平均深度为42至84米。在每个银行内的优选区域中，碱度宽度（m / km）总是更大的。用于浴杯的空间自动相关性对银行内的优选区域具有较小的去相关尺度。年龄-1岁的特优选地区的优选区域比非优势区域更精细的空间鳞片更加粗糙，表明优选的栖息地可能更复杂。在表面结构中存在银行级别依赖，较小的银行在更精细的空间尺寸下崎岖不平。我们假设可能存在栖息地的银行依赖缩放，其中较大的银行有更多种类的栖息地，这些栖息地涵盖了更多的空间尺度。

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