SEPARATING EFFECTS OF LIMITED FOOD AND SPACE ON GROWTH OF THE GIANT SCALLOP PLACOPECTEN-MAGELLANICUS IN SUSPENDED CULTURE

被引:37
作者
COTE, J [1 ]
HIMMELMAN, JH [1 ]
CLAEREBOUDT, MR [1 ]
机构
[1] UNIV LAVAL, GRP INTERUNIV RECH OCEANOG QUEBEC, QUEBEC CITY G1K 7P4, QUEBEC, CANADA
关键词
FOOD SPACE COMPETITION; DENSITY EFFECT; BIVALVE GROWTH; AQUACULTURE; PLACOPECTEN-MAGELLANICUS;
D O I
10.3354/meps106085
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Effects of limitations in space and food resources on the growth of the giant scallop Placopecten magellanicus (Gmelin, 1791) were examined by growing juveniles in pearl nets at different densities in 2 series, one in which density was increased by adding living scallops and d second in which density was increased by adding 'dummy' (non-living) scallops. The dummies occupied space but did not compete for food resources. For the first series, increasing the density from 25 to 250 ind. net-1 caused a marked decrease in growth. In contrast, no significant decrease occurred in the series in which density was increased by adding dummies. This demonstrated that food depletion is the major factor causing decreased growth at high densities. The only evidence suggesting an effect of space was a decrease in the mass of the muscle and other soft tissues with increasing density in the series with dummies; however, this decrease was not significant. Density did not affect rates of mortality, either in the absence or presence of dummy scallops.
引用
收藏
页码:85 / 91
页数:7
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