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首页> 外文期刊>Journal of Shellfish Research >Long-term (1939 to 2008) spatial patterns in juvenile eastern oyster (Crassostrea virginica, Gmelin 1791) abundance in the Maryland portion of Chesapeake Bay.
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Long-term (1939 to 2008) spatial patterns in juvenile eastern oyster (Crassostrea virginica, Gmelin 1791) abundance in the Maryland portion of Chesapeake Bay.

机译：切萨皮克湾马里兰部分的东部东部牡蛎（Crassostrea virginica，Gmelin 1791）的长期（1939年至2008年）空间格局。

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Stocks of eastern oysters (Crassostrea virginica, Gmelin 1791) have undergone dramatic declines in the Chesapeake Bay since the mid 1800s. As a result, substantial efforts have been made to try and reverse this decline to provide support for a commercially and socially important fishery and, more recently, to restore the oyster's important ecological role. Since 1939, juvenile oyster abundance has been measured at sentinel oyster bars in the northern portion of Chesapeake Bay, Maryland. We conducted a cluster analysis on these data and detected 4 distinct spatial patterns. These patterns were related to juvenile oyster abundance (i.e., bars that experienced high overall juvenile abundance grouped together) and salinity. Of the sentinel bars sampled since the mid 1980s, our analysis identified 13 bars that were characterized by high juvenile oyster abundance and low variation among years, which makes them prime candidate bars for protection to aid in restoration. A comparison with bars already protected within oyster sanctuaries revealed some overlap (4 total bars in common); however, the 13 bars we identified were found over broader geographical and salinity ranges. Juvenile oyster abundance on this group of 13 prime bars was intercorrelated significantly, suggesting that interannual variability in juvenile oyster abundance affects each region similarly. Significant correlations between the juvenile oyster abundance time series and the Palmer hydrological drought index suggest that variations in wet/dry cycles are the cause of this interannual variability. Our analysis also indicates that the entire oyster population of the northern Chesapeake Bay may respond in similar manner to climate change effects.
机译：自1800年代中期以来，切萨皮克湾的东部牡蛎种群（Crassostrea virginica，Gmelin 1791）急剧下降。结果，已经做出了巨大的努力以试图扭转这种下降的趋势，从而为商业和社会上重要的渔业提供支持，并在最近恢复了牡蛎的重要生态作用。自1939年以来，在马里兰州切萨皮克湾北部的哨兵牡蛎条上测量了少年牡蛎的丰度。我们对这些数据进行了聚类分析，发现了4种不同的空间格局。这些模式与少年牡蛎丰度（即经历了总体总体少年高丰度的金条组合在一起）和盐度有关。在自1980年代中期以来取样的前哨酒吧中，我们的分析确定了13个酒吧，这些酒吧的特点是少年牡蛎丰度高，年间变化低，这使其成为保护鱼类以恢复的主要候选酒吧。与牡蛎保护区内已经受保护的金条进行比较，发现有一些重叠（共有4条金条共同存在）。但是，我们发现的13个条形图的地理和盐分范围更广。这组13个主要棒上的牡蛎丰度显着相关，这表明，牡蛎丰度的年际变化对每个区域的影响相似。少年牡蛎丰度时间序列与Palmer水文干旱指数之间的显着相关性表明，干湿循环的变化是这种年际变化的原因。我们的分析还表明，切萨皮克湾北部的整个牡蛎种群可能以类似的方式应对气候变化的影响。

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