A growth cline in encrusting benthos along a latitudinal gradient within Antarctic waters

被引:26
作者
Barnes, DKA [1 ]
Arnold, R
机构
[1] Natl Univ Ireland Univ Coll Cork, Dept Zool & Anim Ecol, Cork, Ireland
[2] British Antarctic Survey, Cambridge CB3 0ET, England
关键词
benthos; Antarctic; growth; mortality; disturbance; cline;
D O I
10.3354/meps210085
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Growth and mortality of 3 species (Inversiula nutrix, Celleporella bougainvillei, Fenestrulina rugula) of encrusting bryozoans were examined from 5 Antarctic localities, along a latitudinal gradient. Typically, growth in marine invertebrates is, for ecological equivalents, slower or much slower in cold seas than warm waters. Contrary to the general trend, growth rates of 3 bryozoans were found to accelerate with increasing latitude in Antarctic waters. Population age structure also showed a dramatic change across the 5 study sites (from 54 to 68 degrees S) through hugely increased mortality with increasing latitude. Reduction in inter-specific competition is theorised as explaining higher growth rates. Increased levels of ice scour are probably responsible for the differential mortality.
引用
收藏
页码:85 / 91
页数:7
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