Population dynamics of the non-native crab Petrolisthes armatus invading the South Atlantic Bight at densities of thousands m-2
Population dynamics of the non-native crab Petrolisthes armatus invading the South Atlantic Bight at densities of thousands m-2
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DOI：
10.3354/meps336211
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发表时间：
2007-01-01
影响因子：
2.5
通讯作者：
Hay, M. E.
中科院分区：
文献类型：
--
作者：
Hollebone, A. L.;Hay, M. E.
青瓷蟹最近入侵了南大西洋海湾的牡蛎礁。在美国佐治亚州沿海的两个河口，蟹类密度在某些时期和地点达到了4 000~11000只蟹m(-2)的峰值。一般情况下，潮间带的低密度高于高潮间带，河口的低密度比高密度高。在温暖的月份，20%到90%的成年女性怀孕，新兵密集，人口水平高。在较冷的月份，密度由下降至>；99%。在不同的时间和地点，男性和女性的比例接近1：1。佐治亚州华山松的最大平均密度是推定原生范围内最高密度的37倍。新范围内的螃蟹繁殖的体型较小，新范围和旧范围内怀孕雌性蟹的百分比相似。因此，佐治亚州的人口繁殖力比原生范围高出一个数量级以上。原生泥蟹的密度与外来蟹的密度不相关或呈正相关，相关关系从未达到显著负相关。Armatus对当地群落的影响尚不清楚，但如果这种滤食性螃蟹影响牡蛎，可能会相当大，牡蛎是近岸珊瑚礁的基础物种。
The green porcelain crab Petrolisthes armatus recently invaded oyster reefs of the South Atlantic Bight. In 2 estuaries of coastal Georgia, USA, crab densities reached peak densities of 4000 to 11000 crabs m(-2) in some periods and locations. Densities generally were higher in the low versus the high intertidal and in the lower versus upper regions of the estuaries. In warmer months, 20 to 90 % of adult females were gravid, recruits were dense, and population levels were high. In colder months, densities dropped by 64 to > 99 %. Male:female ratios were near 1: 1 across times and locations. Maximum mean densities of P. armatus in Georgia were 37 times the highest densities recorded in the presumptive native range. Crabs in the new range reproduced at a smaller size, and the percentage of gravid females was similar between the old and new range. Thus, population fecundity in Georgia exceeds that of the native range by more than 1 order of magnitude. Densities of native mud crabs in the genera Panopeus and Eurypanopeus were unrelated to, or positively correlated with, densities of the exotic crabs; correlations were never significantly negative. The impact of Petrolisthes armatus on native communities is unclear, but could be considerable if this filter-feeding crab impacts oysters, which are the foundation species of inshore reefs.