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The carrying capacity of a tidal flat area for suspension-feeding bivalves

机译：悬浮饲料双壳类的潮滩面积的承载能力

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To investigate the relationship between stock size and production of an entire feeding guild, and in particular to find out whether this relationship is dome-shaped (showing an optimal abundance for production), we used a 40 yr data set of the 3 most important suspension-feeding bivalves (Cerastoderma edule, Mytilus edulis, and Mya arenaria) in a Wadden Sea tidal flat area (about 20 km(2)). The data set contained data on numerical density of individuals, annual rates of weight growth, recruitment, survival, and secondary production. At higher densities (>400 ind. m(-2)), we found reductions of growth rate and recruitment. At the highest densities, the reduction in weight growth was so strong that production was lower than its maximal values at intermediate densities. This optimal density of around 400 ind. m(-2) was considered to represent the carrying capacity of the system for suspension-feeding bivalves. High densities resulting in reduced production, however, rarely (in only 5 % of the years) occurred over the 40 yr monitoring period. Clear bottom-up limitation of bivalve production was thus very unusual in the studied area. Year-to-year variation in growth and production of suspension-feeding bivalves were not related to chlorophyll concentrations in the main tidal stream and did not follow the declining long-term trends of primary production and chlorophyll concentrations. The main conclusion of the paper is that production increases with stock size, but only to a certain threshold value that is rarely reached as a consequence of recruitment being curtailed by a top-down process (predation on young stages).
机译：为了调查种群规模与整个饲养行会的产量之间的关系，特别是找出这种关系是否呈圆顶状（显示出生产的最佳丰度），我们使用了3个最重要的悬浮液的40年数据集在瓦登海潮滩区域（约20 km（2））中喂食双壳类动物（小皮毛虫，紫草菌和沙丁鱼）。该数据集包含有关个体的数字密度，体重的年增长率，募集，存活和次级生产的数据。在更高的密度（> 400 ind。m（-2））下，我们发现增长率和招聘人数减少。在最高密度下，体重增加的减少非常强烈，以至于产量低于中等密度下的最大值。最佳密度约为400 ind。 m（-2）被认为代表了悬浮饲料双壳类动物的系统承载能力。高密度导致产量下降，但是在40年的监测期内很少（仅占年份的5％）发生。因此，在所研究的地区中，双壳类生产的明确的自下而上的局限性是非常罕见的。悬浮饲料双壳类动物的生长和产量的逐年变化与主要潮汐流中的叶绿素浓度无关，并且与初级产量和叶绿素浓度的长期下降趋势无关。该论文的主要结论是，产量随着存货规模的增加而增加，但仅达到一定的阈值，这是由于自上而下的过程（在幼年阶段捕食）而减少了招募的结果。

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