Bosman A L, Hockey P A R
FitzPatrick Institute of African Ornithology, University of Cape Town, 7700, Rondebosch, South Africa.
Oecologia. 1988 Apr;75(3):412-419. doi: 10.1007/BF00376945.
Rates of algal production were measured at 6 rocky intertidal sites on the southwestern Cape coast, South Africa, where populations of the limpet Patella granularis occur. Rates of algal production and limpet mortality were recorded at each site and both factors affected limpet reproductive fitness. Limpet growth rates and biomass at different sites were significantly correlated with rates of algal production, and limpet mortality was related to the density of African Black Oystercatchers, important predators of P. granularis. Life-time gametic output of a hypothetical cohort of limpets at each site was modelled using the measurements of growth, reproduction and mortality made at each site. Limpet cohorts at sites with rapid rates of algal production were predicted to have a larger life-time production of gametic material than cohorts at sites with slow algal production rates, except in instances of acute predatory pressure. In the light of the overriding influence of food supply on the expression of limpet life-history parameters, it is imperative that researchers consider food availability before assuming that local, population-specific differences in life-history patterns are due to genetic differences.
在南非开普敦西南海岸的6个岩石潮间带地点测量了藻类生产率，这些地点有粒帽贝种群。在每个地点记录了藻类生产率和帽贝死亡率，这两个因素都影响帽贝的繁殖适合度。不同地点的帽贝生长率和生物量与藻类生产率显著相关，帽贝死亡率与非洲黑蛎鹬的密度有关，非洲黑蛎鹬是粒帽贝的重要捕食者。利用在每个地点进行的生长、繁殖和死亡率测量，对每个地点假设的帽贝群体的终生配子产量进行了建模。预计藻类生产率高的地点的帽贝群体比藻类生产率低的地点的群体有更大的终生配子物质产量，但在急性捕食压力的情况下除外。鉴于食物供应对帽贝生活史参数表达的首要影响，研究人员在假设生活史模式的局部、种群特异性差异是由遗传差异引起之前，必须考虑食物可获得性。
