Niche processes and conservation implications of fish community assembly in a rice irrigation system
Niche processes and conservation implications of fish community assembly in a rice irrigation system
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水稻灌溉系统中鱼类群落聚集的生态位过程和保护意义
DOI：
10.1002/aqc.2558
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发表时间：
2015
影响因子：
2.4
通讯作者：
Y. Senga
中科院分区：
文献类型：
--
作者：
Mitsuru Ohira;H. Tsunoda;K. Nishida;Yoshito Mitsuo;Y. Senga
河岸河流系统用于水稻灌溉。这种做法导致越来越需要保护这些河岸系统的生物多样性，以防止水稻灌溉系统的强化。本研究探讨了在传统的水稻灌溉系统，以及如何这些过程可能会通知保护计划的结构鱼类群落组合的基本过程。
2007年9月和12月以及2008年5月，在一条永久灌溉渠道的26个河段进行了取样。生态位与扩散过程的相对作用是通过研究当地环境中的物种丰富度来确定的，如生境的复杂性（深度和速度的多样性）和大小（水量）或与河流的接近程度作为物种的潜在来源，以及确定性与随机过程。非随机或随机模式的物种共存进行了比较，在整个网站。
每个站点的物种丰富度主要与栖息地的复杂性和大小，但不接近河流。此外，物种共同发生非随机隔离模式。因此，鱼类群落的结构是确定性的生态位过程和局部灭绝，而不是随机和外部移民过程。此外，观察到的相对丰度分布主要符合对数正态分布，表明一个“低应力”的鱼类群落的条件。
为了促进鱼类的共存，高度保护优先考虑当地的因素，如水力复杂性和水的体积在达到规模的水稻灌溉系统。鱼类喜欢缓慢和浅的环境中共同出现的河段之间的频率较低，证明需要保护水力变异。当地因素和确定性模式的有效性被认为来自稳定的水流和高度的内部和外部连通性，这反过来又会保护结构化鱼类群落组合的过程。这种水文连通性可能是加强稻田景观保护的关键。
版权所有© 2015约翰威利父子有限公司.
Riparian fluvial systems are used for the irrigation of rice. This practice has led to an increasing need to conserve biodiversity of these riparian systems against intensification of rice irrigation systems. This study examined the underlying processes that structure fish community assemblages in a traditional rice irrigation system and how these processes might inform conservation programmes.
Sampling was conducted at 26 reaches of a permanent irrigation channel in September and December 2007 and May 2008. The relative roles of niche versus dispersal processes were determined by examining species richness across the local environment, such as habitat complexity (diversity of depth and velocity) and size (volume of water) or proximity from the river as potential source of species, and deterministic versus stochastic processes. Non-random or random patterns of species co-occurrence were also compared across the sites.
Each site's species richness was mainly associated with habitat complexity and size, but not proximity to the river. Also, species co-occurred non-randomly in segregated patterns. Therefore, the fish community was deterministically structured by niche processes and local extinction, but not by stochastic and external immigration processes. In addition, the observed relative abundance distributions primarily fitted a log–normal distribution, indicating a ‘low stress’ condition for the fish community.
To enhance co-existence of fish species, high conservation priority should be given to local factors such as hydraulic complexity and volume of water at reach scale in the rice irrigation system. Fish species preferring slow and shallow environments co-occurred less frequently among reaches, demonstrating the need to conserving hydraulic variability. The effectiveness of local factors and deterministic patterns is thought to derive from stable water flow and high internal and external connectivity, which in turn would safeguard the processes that structure fish community assemblages. Such hydrological connectivity might be the key for conservation in intensified rice-farming landscapes.
Copyright © 2015 John Wiley & Sons, Ltd.
影响因子：
2.4
作者：
Naoki Katayama;Daigo Saitoh;Tatsuya Amano;T. Miyashita
通讯作者：
Naoki Katayama;Daigo Saitoh;Tatsuya Amano;T. Miyashita