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首页> 外文期刊>Estuarine Coastal and Shelf Science >Role Of Mysid Seasonal Migrations In The Organic Matter Transfer In The Curonian Lagoon, South-eastern Baltic Sea
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Role Of Mysid Seasonal Migrations In The Organic Matter Transfer In The Curonian Lagoon, South-eastern Baltic Sea

机译：Mysid季节性迁徙在东南波罗的海库尔斯沙嘴泻湖中有机物转移中的作用

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摘要

We investigated population dynamics, growth and feeding of an omnivorous mysid, Paramysis lacustris, performing seasonal horizontal migrations in the Curonian Lagoon. In autumn, increased predation pressure and deteriorated feeding conditions, due to zooplankton and phytoplankton decline in the open water, forces mysids to migrate to the shoreline, where large amounts of decaying submersed vegetation occur at the end of plant growth season. Using stable isotope analysis and mixing models, we evaluated relative importance of decaying submersed macrophytes, lagoon phytoplankton and mesozooplankton in the diet of mysids during this period. In September-November, mysids actively grew and produced three cohorts. Specific growth rates of adults (10.9 ± 1.9 mm) and subadults (6 ± 0.5 mm) were 3 and 9% DW d~(-1), respectively, resulting in population somatic production of 36 g DW m~(-2). Both δ~(15)N and δ~(13)C of mysids varied in concert with those in suspended and bottom particulate organic matter (POM) and mesozooplankton. The mixing models estimated that 45% of mysid diets were composed of bottom POM originated from the decaying macrophyte PotamogeCon perfoliatus, 45% by suspended POM largely consisting of phytoplankton, while mesozooplankton contributed less than 10% of the diet. This diet composition differs from that in summer, when mysids rely mostly on zooplankton and phytoplankton. Therefore, mysid horizontal migrations and their ability to efficiently utilize littoral detritus improve the efficiency of macrophyte detritus transfer up the food chain and inshore/offshore habitat coupling in the Curonian Lagoon.
机译：我们调查了库尔斯沙嘴泻湖中杂食性寄生虫（Pamysis lacustris）的种群动态，生长和摄食，并进行了季节性水平迁移。秋季，由于开放水域中浮游动物和浮游植物的减少，捕食压力增加和摄食条件恶化，迫使臭s鱼迁移至海岸线，在植物生长季节结束时，那里大量腐烂的淹没植被发生。使用稳定的同位素分析和混合模型，我们评估了这段时期内，在节肢动物的饮食中，浸没的大型植物，泻湖浮游植物和中层浮游生物的相对重要性。在9月至11月期间，mysids活跃成长并产生了三个队列。成人（10.9±1.9毫米）和亚成人（6±0.5毫米）的比生长率分别为DW d〜（-1）的3％和9％，导致群体体细胞产生36 g DW d〜（-2）。蛋壳的δ〜（15）N和δ〜（13）C均与悬浮和底部颗粒有机质（POM）和中层浮游动物的δ〜（15）N一致。混合模型估计，节肢动物的日粮中有45％是由腐烂的大型植物PotamogeCon perfoliatus产生的底部POM组成，有45％的悬浮POM主要由浮游植物组成，而中型浮游动物的日粮中只有不到10％。这种饮食结构与夏季的饮食结构有所不同，夏季的时候，类蝇s主要依靠浮游动物和浮游植物。因此，mysid水平迁移及其有效利用沿海碎屑的能力提高了大型植物碎屑向食物链和库尔斯沙嘴泻湖沿岸/近海生境耦合的转移效率。

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