THE CONSEQUENCES OF VARIATION IN INITIAL SETTLEMENT VS POSTSETTLEMENT MORTALITY IN ROCKY INTERTIDAL COMMUNITIES
THE CONSEQUENCES OF VARIATION IN INITIAL SETTLEMENT VS POSTSETTLEMENT MORTALITY IN ROCKY INTERTIDAL COMMUNITIES
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DOI：
10.1016/0022-0981(85)90146-7
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发表时间：
1985-11-19
影响因子：
2
通讯作者：
CONNELL, JH
中科院分区：
文献类型：
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作者：
CONNELL, JH
在某些情况下，浮游繁殖体的初始定居可能会影响潮间带群落的结构，但在其他情况下则不会。在极少数关于初始沉降的研究中，大多数是在潮间带藤壶上进行的。藤壶定居者的人口密度有时受到限制，无论是浮游幼虫供应或不利的水柱因素，并在其他时间的空间限制在海岸。定居后的第一周死亡率是独立的定居者密度为两个物种在四个地方。因此，在这些研究中，在海岸定居几周后，年轻新兵的密度是定居者密度的正函数。幼年和成年阶段之间的死亡率是独立的初始密度时，招聘是轻，但密度依赖时，招聘是重。因此，成人密度呈正相关，招募密度时，招聘是轻，但不相关时，招聘是重。最初定居者分布变化的原因从未得到充分研究，大多数证据都是轶事。幼鱼的垂直潮间带界限与两个物种中浮游幼虫的分布相关，并由另一个物种的定居后死亡率决定。在某些情况下，成年人的垂直界限是由招募决定的，而在另一些情况下则由招募后的死亡率决定。水平变化与某一地点的地下水供应有关。在几个物种中，几个地点的招募情况可以在几年内保持一致。这样的网站一致性认为，无论是解决或解决后的早期死亡率是由特定的当地物理条件在一个网站，如沿海形态，内波，海岸波，电流，或一致的丰富的天敌。现有的群落结构的一般模型可能主要适用于定居率或补充率高的地点，而不适用于定居率或补充率低的地点。
Initial settlement of planktonic propagules may affect the structure of intertidal communities in some circumstances but not in others. Of the very few studies of initial settlement, most have been done on intertidal barnacles. Population density of barnacle settlers was sometimes limited by either planktonic larval supply or adverse water column factors, and at other times by space limitation on the shore. Mortality in the first weeks after settlement was independent of settler density for two species in four localities. Therefore the density of young recruits at the end of a few weeks of settlement on shore was a positive function of settler density in these studies. Mortality between juvenile and adult stages was independent of initial density when recruitment was light, but was density-dependent when recruitment was heavy. As a consequence, adult density was positively correlated with recruit density when recruitment was light, but uncorrelated when recruitment was heavy. The causes of variation in distribution of initial settlers have never been adequately studied, and most evidence is anecdotal. The vertical intertidal limit of juveniles was correlated with the distribution of planktonic larvae in two species and determined by post-settlement mortality in another species. The vertical limit of adults was determined by recruitment in some situations and by post-recruitment mortality in others. Horizontal variation was linked to planktonic supply in one location. In several species, recruitment at several sites could be consistently ranked over several years. Such site consistency argues that either settlement or early post-settlement mortality is determined by specific local physical conditions at a site, such as coastal morphology, internal waves, shore waves, currents, or by consistent abundances of natural enemies. Existing general models of community structure probably apply mainly to sites with high rates of settlement or recruitment, not to those where these rates are low.