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首页> 外文期刊>Marine biology >Herbivory in the gammarid amphipod Aora typica: relationships between consumption rates, performance and abundance across ten seaweed species
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Herbivory in the gammarid amphipod Aora typica: relationships between consumption rates, performance and abundance across ten seaweed species

机译:γ-射线两栖动物Aora typica中的食草动物:十种海藻物种的食用率,性能和丰度之间的关系

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This paper reveals a substantial capacity for herbivory of seaweeds in the gammarid amphipod Aora typica, adults eating seven of ten taxonomically and morphologically diverse seaweed species offered to them in a no-choice assay. The green algae Ulva spathulata and Enteromorpha intestinalis were consumed at the highest rates in both no-choice (2.3-2.5 mg blotted weight individual~(-1) day~(-1)) and multiple-choice assays (0.5-1.3 mg blotted weight individual~(-1) day~(-1)). Adult A. typica collected from two different species of brown seaweeds had very similar feeding preferences to each other. Juvenile A. typica grew to reproductive maturity on the green algae E. intestinalis and U. spathulata, and the brown algae Carpophyllum maschalocarpum and Ecklonia radiata. In common with previous studies on members of other amphipod families, survivorship of juvenile amphipods was positively correlated with feeding preferences of adults across seaweed species (r~2=0.43, p = 0.04). However, densities of A. typica on seaweeds in the field (excluding the intertidal E. intestinalis and U, spathulata) were not significantly correlated with feeding preferences of adults (r~2 = 0.07, P=0.5) or survivorship of juveniles (r~2 = 0.17, P = 0.31). This suggests that either host seaweeds are not a major dietary component of these amphipods in nature, or that the host's value as a food source is overridden by other properties such as the degree of shelter it affords from larger consumers. This study provides the first demonstration that a member of the cosmopolitan amphipod family Aoridae is capable of consuming a diverse range of seaweeds.
机译:本文揭示了在γ-两栖动物两栖类Aora typica中海草具有相当大的草食能力,成年成年人食用了在非选择分析中提供给他们的十种分类和形态多样的海藻物种中的七种。在无选择(2.3-2.5 mg体重个体〜(-1)天〜(-1))和多选择试验(0.5-1.3 mg脂肪)中,绿藻Ulva spathulata和肠小肠Enteromorpha的摄入量最高。单身体重〜(-1)天〜(-1))。从两种不同种类的棕色海藻收集的成虫A. typica具有彼此非常相似的摄食偏好。小型A. typica在绿藻E. intestinalis和U. spathulata以及褐藻Carpophyllum maschalocarpum和Ecklonia radiata上生长至生殖成熟。与先前关于其他两栖纲科成员的研究一样,少年两栖纲科的存活率与成年海藻物种的摄食偏好呈正相关(r〜2 = 0.43,p = 0.04)。然而,田间海藻(潮间带肠杆菌和U,spathulata除外)上A. typica的密度与成虫的摄食偏好(r〜2 = 0.07,P = 0.5)或幼虫的存活率(r〜2)没有显着相关。 〜2 = 0.17,P = 0.31)。这表明,寄主海藻不是这些两栖动物的主要饮食成分,或者寄主作为食物来源的价值被其他特性所取代,例如它向较大消费者提供的住房程度。这项研究提供了第一个证明,即大都会两栖动物科天牛科的成员能够食用各种海藻。

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