Life-history consequences of resource allocation of two bdelloid rotifer species
Life-history consequences of resource allocation of two bdelloid rotifer species
复制标题
两种蛭形轮虫资源分配的生活史后果
作者：
C. Ricci;U. Fascio
两种蛭形,Macrotrachela quadricornifera(水生物种)andPhilodina vorax(陆地苔藓物种),类似的生存但不同年龄繁殖力时间表,每天进行分析以确定体积增长率和投资于繁殖。这两个物种有相似的生长模式，并且在还在生长的时候就开始繁殖了。在这两种情况下，成熟时的大小与年龄无关。四角蕨在繁殖结束后达到大小平稳期后恢复生长。沃拉克斯一直繁殖到死亡。虽然p。vorax始终低于m。四角虫，在其一生中，同样比例的成年体积被投入到繁殖中，因为它的卵相对较大。繁殖率的差异可能与等量相对生物量的不同分配有关：“水生”轮虫的小卵较多，而“陆地”轮虫的大卵较少。卵的大小可能与环境的选择压力有关。
Two bdelloid species,Macrotrachela quadricornifera (aquatic species) andPhilodina vorax (terrestrial moss species), with similar survival but different age-specific fecundity schedules, were analyzed daily to determine growth rates and the volume invested in reproduction. The two species had similar growth patterns and started reproduction while still growing. In both, the size at maturity was independent of age.M. quadricornifera resumed growth after reaching a size plateau when reproduction was over, whileP. vorax continued to reproduce until death. Although the net reproductive rate ofP. vorax was consistently lower than that ofM. quadricornifera, the same percent of adult volume was invested in reproduction over its life time because its eggs were relatively bigger. The difference in reproductive rates is probably related to different partitioning of equal amounts of relative biomass: more small eggs for the ‘aquatic’ rotifer vs. fewer big eggs for the ‘terrestrial’ rotifer. Egg size might be related to the selective pressures of the environments.