EFFECTS OF FISHES ON ALGAL RESPONSE TO STORMS IN ATROPICAL STREAM
EFFECTS OF FISHES ON ALGAL RESPONSE TO STORMS IN ATROPICAL STREAM
复制标题
鱼类对热带河流中藻类对风暴反应的影响
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
T. Hamazaki
中科院分区：
文献类型：
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作者：
C. Pringle;T. Hamazaki
我们研究了生物因素（杂食性鱼类的自然组合）如何控制初级生产者在低地热带流中对物理干扰（频繁的高排放事件）的群落反应。作为次要目标，我们评估了鱼类对底栖昆虫的影响。我们使用电动“围栏”，以排除鱼类进入底栖生物群落在浅滩的四阶流排水山麓哥斯达黎加的加勒比海斜坡。底栖藻类和水生昆虫接近鱼类受到激烈的杂食性的不同组合的鱼类。在雨季的7周期间，发生了三个大的排放事件，水位上升到3米以上的基流，流量增加了160倍，悬浮砾石和小鹅卵石造成重大冲刷。鱼类显着影响藻类的演替，群落组成，并响应高排放事件。在鱼类存在的情况下，藻类组合以丝状蓝绿藻为主。
We examined how biotic factors (natural assemblages of omnivorous fishes) control the community response of primary producers to physical disturbance (frequent high discharge events) in a lowland tropical stream. As a secondary objective, we assessed effects of fishes on benthic insects. We used electric “fences” to exclude access of fishes to benthic communities in a riffle of a fourth-order stream draining the foothills on Costa Rica’s Caribbean slope. Benthic algae and aquatic insects accessible to fishes were subject to intense omnivory by a diverse assemblage of fishes. Over a 7-wk period in the rainy season, three large discharge events occurred in which water levels rose up to 3 m above base flow, discharge increased by up to 160-fold, and suspended gravel and small cobbles caused major scouring. Fishes significantly affected algal succession, community composition, and response to high discharge events. Algal assemblages that developed in the presence of fishes were dominated by filamentous blue-g...