《Aquatic Ecological》杂志刊登“盐度和被捕食动物的存在对淡水沼泽中大型无脊椎动物的影响”

作者：Sung-Ryong Kang and Sammy L.King

刊物：《Aquatic Ecological》，2012年8月3日

关键词：大型水生无脊椎动物；耐盐度；饵料密度；淡水沼泽

摘要：沿海淡水环境盐碱化是一个全球性问题。由于海平面上升、风暴潮增加或者其他的作用机制，美国路易斯安那州沿海淡水沼泽的盐度增加。尽管大型水生无脊椎动物对于营养循环、生物多样性以及作为脊椎动物的食物源具有非常重要的作用，但关于盐度增加对水生无脊椎动物的影响研究较少。在路易斯安那州西南部的淡水沼泽中，开展了一系列微环境实验来评估盐度、暴露持续时间、饵料密度对优势水生无脊椎动物相对存活率的影响。实验假定盐度增加、饵料缺失和暴露持续时间增加将会降低水生大型无脊椎动物的存活率，并且甲壳类比水生昆虫类群有更高的存活率。因为只有盐度增加，结合暴露持续时间的延长，才会影响水生大型无脊椎动物的存活，所以这里第一种假定的观点是部分成立的。另外，甲壳类比水生昆虫的存活率更高。当盐碱胁迫协同其它压力共同作用时，可能会导致水生大型无脊椎动物的死亡。

Influence of salinity and prey presence on the survival of aquatic macroinvertebrates of a freshwater marsh

Author: Sung-Ryong Kang and Sammy L.King

Journal: Aquatic Ecological

Key words: Aquatic macroinvertebrate ;Salinity tolerance ; Prey availability ;Freshwater marsh

Abstract: Salinization of coastal freshwater environments is a global issue. Increased salinity from sea level rise, storm surges, or other mechanisms is common in coastal freshwater marshes of Louisiana, USA. The effects of salinity increases on aquatic macroinvertebrates in these systems have received little attention, despite the importance of aquatic macroinvertebrates for nutrient cycling, biodiversity, and as a food source for vertebrate species. We used microcosm experiments to evaluate the effects of salinity, duration of exposure, and prey availability on the relative survival of dominant aquatic macroinvertebrates (i.e., Procambarus clarkii Girard, Cambarellus puer Hobbs, Libellulidae, Dytiscidae cybister) in a freshwater marsh of southwestern Louisiana. We hypothesized that increased salinity, absence of prey, and increased duration of exposure would decrease survival of aquatic macroinvertebrates and that crustaceans would have higher survival than aquatic insect taxon. Our first hypothesis was only partially supported as only salinity increases combined with prolonged exposure duration affected aquatic macroinvertebrate survival. Furthermore, crustaceans had higher survival than aquatic insects. Salinity stress may cause mortality when acting together with other stressful conditions.

原文链接：http://www.springerlink.com/content/w1761n7441535731/