The ctenophore Mnemiopsis leidyi A. Agassiz, 1865 originates from estuaries and coastal waters along Atlantic coastlines from the Chesapeake Bay, USA, to Argentina. Through ballast waters, the species has spread the past 30 years over Eurasia. On the French Mediterranean coastlines, Mnemiopsis leidyi was first formally identified in the Berre Lagoon in 2005 and has been episodically present in other Mediterranean lagoons as Bages-Sigean, Vaccarès, and Estomac. Since 2010–2011 no update of the distribution of Mnemiopsis leidyi has been made. Since 2019, many records of Mnemiopsis leidyi have been reported in other French Mediterranean lagoons along the coast of the Gulf of Lion. In this context, a field survey on the French Mediterranean coast was conducted in July 2020 to measure the expansion of the Mnemiopsis population in coastal lagoons which are potential refuge habitats for this species. Mnemiopsis leidyi was present in 8 different areas: Or, Pérols, Vic, Ingril, Rhône-Sète Channel, Bages-Sigean, and Salses-Leucate. We were able to quantify for the first time the abundance and size structure of Mnemiopsis in the lagoons of Or, Pérols, Vic, Ingril, Rhône-Sète Channel, and Salses-Leucate. A decrease in the abundance of Mnemiopsis leidyi was observed from 1 ind m⁻³ (Ingril Lagoon) to 28 ind m⁻³ (Grec Lagoon) and 42 ind m⁻³ (Rhône-Sète Channel) between the North and the South along the Rhône-Sète Channel in parallel to the increase of salinity (from 20 to 41). The abundances measured in Bages-Sigean and Salses-Leucate lagoons were similar: 6 ind m⁻³ and 7 ind m⁻³ respectively.

ctenophore Mnemiopsis leidyi A. Agassiz，1865年起源于从美国切萨皮克湾到阿根廷沿大西洋海岸线的河口和沿海水域。通过压舱水，该物种在过去的30年中遍布欧亚大陆。在法国地中海沿岸，Mnemiopsis leidyi于2005年首次在Berre泻湖中正式发现，并在其他地中海泻湖中流行，如Bages-Sigean，Vaccarès和Estomac。自2010-2011年以来，没有对莱比耶纳猪笼草的分布进行更新。自2019年以来，有许多关于雷米氏菌的记录狮子湾沿岸的其他法国地中海泻湖也有报道。在这种情况下，于2020年7月对法国地中海沿岸进行了实地调查，以测量沿海泻湖中Mnemiopsis种群的扩展，沿海泻湖是该物种的潜在避难所。猪笼草（Leemiyi mnemiopsis leidyi）存在于8个不同的区域：佩罗斯（Pérols），维克（Vic），英格里（Ingril），罗纳-塞特海峡（Rhône-SèteChannel），巴格斯-西甘（Bages-Sigean）和萨尔斯-吕特（Salses-Leucate）。我们首次能够定量分析Or，Pérols，Vic，Ingril，Rhône-SèteChannel和Salses-Leucate泻湖泻湖中的Mnemiopsis的丰度和大小结构。从1 ind m ^-3观察到莱比冬虫的丰度降低（Ingril泻湖）沿Rhône-Sète航道在南北之间达到28 ind m ^-3（Grec Lagoon）和42 ind m ^-3（Rhône-Sète海峡），与盐度的增加平行（从20增至41 ）。在Bages-Sigean和Salses-Leucate泻湖中测得的丰度相似：分别为6 ind m ^-3和7 ind m ^-3。