Seasonally tracking vertical and horizontal distribution of unionid mussels (Pronodularia japanensis): implications for agricultural drainage management
Seasonally tracking vertical and horizontal distribution of unionid mussels (Pronodularia japanensis): implications for agricultural drainage management
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季节性跟踪日本贻贝（Pronodularia japanensis）的垂直和水平分布：对农业排水管理的影响
DOI：
10.1002/aqc.1153
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发表时间：
2011
影响因子：
2.4
通讯作者：
Y. Kayaba
中科院分区：
文献类型：
--
作者：
J. Negishi;H. Doi;Izumi Katano;Y. Kayaba
1.在日本中部的一条农业排水渠中，研究了春季、夏末和冬季不同大小的贝类，包括幼体(50 mm)的垂直和水平分布。
2.春季表层(0-3 cm深度)有大量的小型幼鱼，而约有一半的成体仍停留在深层(3-8 cm深度)。夏季，无论类群大小，大多数个体都在表层，冬季约有70%的个体下降到深层。
3.水平分布不随季节变化，在底质稳定或有水力遮挡的区域始终存在高密度斑块。成虫丰度对幼体的空间分布有较好的预测作用。
4.大小-频率分布在三个季节呈多峰分布，近年来新招募幼体的估计数量变化很大，这表明由于不规律的繁殖和/或招募而很少发现幼体，而不是小型幼体喜欢的被忽视的栖息地。
5.由于日本对虾的特征是向下挖掘到∼10 cm的深度，因此维持沉积物沉积过程似乎是保护农业排水渠道系统中贻贝栖息地的关键标准之一，这些渠道系统通常以光滑的混凝土材料为衬里。版权所有©2010 John Wiley&Sons，Ltd.
1.The vertical and horizontal distribution of unionoid mussels (Pronodularia japanensis) were examined in spring, late summer and winter for different size classes, including juveniles ( 50 mm), in an agricultural drainage channel in Central Japan.
2.A large number of small-sized juveniles were found at the surface (0–3 cm depth) in spring, whereas approximately half of the adults remained in the deep layer (3–8 cm depth). Most individuals were found in the surface layer irrespective of size classes in summer, and approximately 70% of all individuals descended to the deep layer in winter.
3.Horizontal distribution did not substantially change across seasons and high density patches were consistently found in the areas where substrate appeared to be stable or hydraulically sheltered. Spatial distribution of small juveniles was relatively well predicted by the abundance of adults.
4.The size–frequency distribution was multi-modal in three seasons and estimated numbers of newly recruited juveniles were highly variable in recent years, suggesting that juveniles were rarely found owing to irregular reproduction and/or recruitment not the overlooked habitat preferred by small-sized juveniles.
5.As P. japanensis is characterized by the behaviour of burrowing down to a depth of ∼10 cm, maintaining the processes of sediment deposition appears to be one of the critical criteria for the conservation of mussel habitats in agricultural drainage channel systems, which are commonly lined with smooth concrete materials. Copyright © 2010 John Wiley & Sons, Ltd.
影响因子：
6.3
作者：
Ricciardi, A;Rasmussen, JB
通讯作者：
Rasmussen, JB