Resource partitioning by four species of elasmobranchs (Batoidea: Urolophidae) in coastal waters of temperate Australia
Resource partitioning by four species of elasmobranchs (Batoidea: Urolophidae) in coastal waters of temperate Australia
复制标题
澳大利亚温带沿海水域四种软骨鱼类（Batoidea：Urolophidae）的资源分配
DOI：
10.1007/s002270050363
复制
发表时间：
1998
期刊：
影响因子：
2.4
通讯作者：
K. Clarke
中科院分区：
文献类型：
--
作者：
M. E. Platell;I. Potter;K. Clarke
刺麻四种（Urolophus lobatus，美国）。paucimaculatus, Trygonoptera personataandT。在1990/1991年夏季至1992年冬季的每个季节，在沿着澳大利亚西海岸下游约200公里的四个地区的沙质基质上采集的样本中，粘膜)含量丰富。本研究的主要目的是确定这四个物种是否按栖息地、大小、性别和/或饮食分开，从而减少种内和种间竞争的可能性。f、b和t的密度。在深海，近海水域（20 - 35米）的人几乎总是比在浅海，近海水域（5 - 15米）的人大。在最南端的地区，无论深度如何，paucimaculatus最多；粘膜在水体较深的单一近岸部位最高。这些物种中没有一个是按大小或性别分开的。以各种甲壳类动物为主的两种栉龙和以各种多毛类动物为主的两种食虫目体积组成差异显著。这两种龙最初主要以片脚类动物、粘足类动物和甲壳类十足类动物为食。小叶鱼开始吞食硬骨鱼。paucimaculatus开始以误入歧途的多毛类和对足类十足类动物为食。错误多毛体对饮食的贡献。个体特征从最小鱼类的0%逐渐上升到最大鱼类的90%，从而解释了伴随而来的饮食宽度的逐渐下降，以及种内饮食重叠通常只发生在连续的大小类别之间。相比之下，久坐多毛动物对饮食的体积贡献。终生保持较高的黏膜含量（65 - 80%），这解释了大多数体型类的饮食宽度相对较低且保持不变，并且除了一对体型类外，其他所有体型类的饮食都有明显的重叠。四种黄貂鱼的饮食偶尔会在不同的地点有所不同，有时还会发生季节性变化，这可能反映了环境中猎物类型的时空差异。由于这两种食材中底栖动物与外底栖动物的比例大于这两种食材，因此前两种食材显然更深入底物。四种刺黄属植物在不同生境间的部分分离，以及它们在饮食组成和摄食策略上的差异，可能有助于这些类板鳃目植物在同一地区丰富时的共存。
Four species of stingarees (Urolophus lobatus,U. paucimaculatus,Trygonoptera personataandT. mucosa) were abundant in samples collected from over sandy substrates in four regions along ∼200 km of the lower west coast of Australia in each season between summer 1990/1991 and winter 1992. The main aim of this study was to determine whether these four species were segregated by habitat, size, sex and/or diet, thereby reducing the potential for intra- and interspecific competition. The densities ofU. lobatusandT. personatawere almost invariably greater in deep, offshore waters (20 to 35 m) than in shallow, inshore waters (5 to 15 m), while those ofU. paucimaculatuswere greatest in the southernmost region, irrespective of depth, and those ofT. mucosawere highest at the single inshore site at which the water was deep. None of these species was segregated by either size or sex. The volumetric dietary compositions of the twoUrolophusspecies, which consisted predominantly of various crustaceans, and those of the two species ofTrygonoptera, which consisted mainly of different polychaetes, were significantly different from each other. The twoUrolophusspecies initially fed largely on amphipods, mysids and carid decapods but, with increasing size,U. lobatusstarted to ingest teleosts andU. paucimaculatuscommenced feeding on errant polychaetes and penaeid decapods. The contribution of errant polychaetes to the diets ofT. personatarose progressively from 0% in the smallest fish to 90% in the largest fish, thereby accounting for a concomitant progressive decline in dietary breadth and for intraspecific dietary overlap typically to occur only between successive size classes. In contrast, the volumetric contribution of sedentary polychaetes to the diets ofT. mucosaremained high (65 to 80%) throughout life, which accounts for the relatively low and constant dietary breadth of most size classes and a significant overlap in the diets of all but one pair of size classes. The diets of each of the four stingaree species occasionally differed between sites and sometimes underwent seasonal changes, presumably reflecting spatial and temporal differences in the types of prey in the environment. Since the ratios of benthic to epibenthic prey in the diets of the twoTrygonopteraspecies were greater than in those of the twoUrolophusspecies, the first two species apparently forage deeper into the substrate. The combination of partial segregation of the four stingaree species among habitats and the differences in the dietary compositions and feeding strategies of these species, would presumably facilitate the co-existence of these batoid elasmobranchs when they are abundant in the same general region.