伊比利亚河共生的当年生鳟和埃布罗河的夏季摄食关系(英文)  

Summer feeding relationships of the co-occurring hatchling brown trout Salmo trutta and Ebro minnows Phoxinus bigerri in an Iberian river

作　　者：Javier OSCOZ Pedro M. LEUNDA María C.ESCALA Rafael MIRANDA 

机构地区：[1]Department of Zoology & Ecology, Faculty of Sciences, University of Navarra [2]Gestión Ambiental Viveros y Repoblaciones de Navarra S.A.,c/ Padre Adoain 219 Bajo, E-31015 Pamplona, Navarra, Spain

出　　处：《动物学报》2008年第4期675-685,共11页ACTA ZOOLOGICA SINICA

基　　金：Gestión Ambiental Viveros y Repoblaciones de Navarra S.A.;Fundación Universitaria de Navarra forsamplings

摘　　要：1996-1998年8月在Larraun河(埃布罗河流域,西班牙北部)共捕获306尾埃布罗河和185尾0龄的鳟,分析比较了胃含物组成,并测定了种间的食物重叠。食物的个数百分比组成表明两种都主要摄食水生无脊椎动物。摄食策略图显示两种都是摄食不同食物种类的广食性种类。另外,比较胃含物和底栖大型无脊椎动物群落表明,0龄的鳟和埃布罗河不摄食光螺科、钩虾科、细蜉科、四节蜉科和卷襀科的物种,而喜食摇蚊科、五节蜉科和毛翅目物种。尽管简化的Morisitas指数表明Larraun河中这两种鱼之间的食物重叠是显著的,但由于栖息地不同和摄食的可塑性可以降低种间的竞争,使得该水域的这两种鱼能以相对较大的数量共存。然而,在食物资源和可用栖息地有限的河域,埃布罗河的引入,其适应性和可塑性有可能威胁单独存在的鳟。The stomach content composition of 306 Ebro minnows and 185 hatchling brnwn trout captured in August （ 1996 - 1998） in the Larraun River （Ebro River Basin, Northern Spain） is described and compared in order to determine interspecific dietary overlap. Both species fed mainly on aquatic invertebrates. Feeding strategy plots showed that both species are generalist feeders with a heterogeneous diet. Additionally, the comparison between the stomach content and the benthic macroinvertebrate community revealed that both hatchling brown trout and Ebro minnows avoided Ehnidae, Gammaridae, Caenidae, Baetidae and Leuctridae, instead showing a preference for Chironomidae, Heptageniidae and Trichoptera. Even though a simplified Morisita＇s index indicated that the dietary overlap between the two species was significant in the Larraun River, differential habitat use and diet plasticity could be minimizing the interspecific competition in river reaches where both species were co-dominant, allowing cooccurrence of these species in relatively high numbers. However, this adaptability and plasticity in Ebro minnows could he a threat to allopatric brown trout populatinns in rivers with limited trophic resources and limited habitat availability

关 键 词：种间竞争 食物重叠 摄食策略 Larraun河 伊比利亚半岛 

分 类 号：Q958[生物学—动物学]