1. Populations of the European flat oyster Ostrea edulis have experienced catastrophic declines across Europe and subsequent spread of the non‐native species Crepidula fornicata has led to its occurrence in exceptionally high densities in some areas previously dominated by O. edulis.
2. Spatial and temporal concurrence of C. fornicata larvae within the zooplankton community occurs throughout the O. edulis spawning season. A C. fornicata larval peak density of 374.7 ± 96.5 larvae/ml (mean ± SD) was observed in Langston Harbour sympatrically with O. edulis density of 45.7 ± 20.1 larvae/ml in early August. Overall oyster larvae contribution to the zooplankton community was higher in Portsmouth Harbour (12%) than C. fornicata contribution (9.6%), whilst the opposite occurred in Langstone (oysters, 11.7%; C. fornicata, 12%).
3. Larval abundance is not reflected in recruitment on the seabed, owing to the conspecific substrate preference of O. edulis. Settlement of O. edulis spat was significantly greater on settlement discs covered with recently deceased oyster shells; 6.7 ± 1.2 (mean ± SE) spat/disc vs old smooth oyster shells, 2.7 ± 1.3, C. fornicata shell 1.7 ± 0.3, cemented discs 2 ± 1 or the plastic control disc 0.7 ± 0.7.
4. Settlement substrate type matters in the presence of high benthic and larval densities of C. fornicata. The Solent has become a substrate‐limited system for O. edulis; substrate management or reef deployment is required to restore a self‐recruiting population.
5. Finally, although C. fornicata may provide functional equivalence in terms of filtering services, it supports a significantly different and less biodiverse faunal community from that of O. edulis. Therefore C. fornicata does not provide equivalence as an ecosystem engineer and mechanisms of ecological phase shift are occurring within areas dominated by this invasive species.

中文翻译：

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幼虫动力学和底物偏好之间的相互作用对底栖生物多样性和可食用的Osrea edulis Linnaeus，1758年在Crepidula fornicata存在下具有生态学意义。

1. 欧洲平牡蛎的人群食用牡蛎经历了整个欧洲的灾难性下降和非本土物种的蔓延随后履螺属fornicata导致其发生在非常高的密度在以前由主导部分地区食用牡蛎。
2. 浮游动物群落内的C. fornicata幼虫的时空并发发生在整个O. edulis产卵季节。甲C. fornicata 374.7±96.5幼虫/毫升（平均值±SD）的幼虫峰密度中兰斯顿港观察sympatrically与食用牡蛎在八月初的45.7±20.1密度幼虫/毫升。朴茨茅斯港对浮游动物群落的总体牡蛎幼体贡献（12％）高于C. fornicata贡献（9.6％），而在Langstone中则相反（牡蛎为11.7％；C。fornicata为12％）。
3. 幼虫丰度没有反映在招募在海床上，由于的同种的底物偏好O.贻贝。在覆盖有已故牡蛎壳的定居盘上，可食O.suts的沉降明显增加。相对于旧的光滑牡蛎壳2.7±1.3，扁形C. fornicata壳1.7±0.3，胶合盘2±1或塑料对照盘0.7± 0.7,6.7 / 1.2（平均±SE）铲/碟。
4. 结算基材类型的在高底栖和幼虫密度的存在重要C. fornicata。索伦特已经成为用于在基板受限的系统O.贻贝; 要恢复自招募种群，需要进行底物管理或部署礁石。
5. 最后，虽然C. fornicata可以在过滤服务方面提供功能等同，它支持从一个显著不同，少生物多样性的动物群社区食用牡蛎。因此，C。fornicata不能提供与生态系统工程师相同的功能，而生态相移的机制正在这种入侵物种主导的区域内发生。