Interactions between native and invasive gelatinous zooplankton within the Baltic Sea food web (INIGEL)

拟建的项目旨在研究最近入侵北海和波罗的海的栉水母的生物控制。该项目的核心实验应通过现场中观实验进行。重点介绍了与居住的水母水母相互作用的实验研究，以及对形成链的硅藻的干扰影响。雷氏分枝杆菌目前的季节性生长模式的特点是夏初丰度低，夏末急剧暴发。因此，雷氏芽孢杆菌不会与鱼类幼虫同时繁殖，对鱼类幼虫的捕食是雷氏芽孢杆菌入侵最严重的危险因素之一。主要的假设是，链状硅藻的干扰和aurita的负面影响（竞争和捕食幼体）阻止了M. leidyi在初夏爆发，而aurita在夏末的腐烂通过为支持M. leidyi生长的微生物食物链提供DOC（溶解有机碳）促进了M. leidyi爆发。

The proposed projects aims to study biotic controls of the ctenophore jellyfish Mnemiopsis leidyi which recently invaded North and Baltic Sea. The core experiments of the project should be performed by means of field mesocosms. The emphasis is put on experimental studies of the interactions with the resident scyphozoan jellyfish Aurelia aurita and on the effects of interfering chain-forming diatoms. The current seasonal growth pattern of M. leidyi is characterized by low abundance levels in early summer and sharp outbreaks in late summer. Thus, M. leidyi blooms do not co-occur with fish larvae, predation on fish-larvae being one of the most serious risk factor associated with M. leidyi invasions. The main hypotheses are that interference by chain forming diatoms and negative effects of A. aurita (competition and predation on juveniles) prevent outbreaks of M. leidyi during early summer, while the decay of A. aurita in late summer facilitates M. leidyi outbreaks by providing DOC (Dissolved Organic Carbon) for a microbial food chain supporting M. leidyi growth.