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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Food, feeding and growth rates of peracarid macro-decomposers in a Ria Formosa salt marsh, southern Portugal
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Food, feeding and growth rates of peracarid macro-decomposers in a Ria Formosa salt marsh, southern Portugal

机译：葡萄牙南部Ria Formosa盐沼中过全分解宏分解物的食物，摄食和生长速率

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摘要

The diet, feeding rates and growth rates of three species of isopod and three species of amphipod from a Ria Formosa salt marsh in southern Portugal are compared to test the hypotheses that the relative success of amphipods as macro-decomposers in salt marshes worldwide can be a) attributed to their utilizing a distinctly different range of potentially available food resources and b) attributed to them using similar food resources but at different rates. The first hypothesis was tested using a combination of gut contents analysis, stable isotope analysis and multiple-choice food preference tests. The results of all three analyses showed that there was a very broad overlap in the resource utilization curves for these species for the most abundant potential foods available in the upper salt marsh. The first hypothesis was therefore rejected. The second hypothesis was tested with palatability experiments in which consumption rates of each of the test animals were compared for each potential food offered alone. The amphipods ate all five of the foods significantly faster, consuming from 3-73 x more food per unit mass than the isopods. Analyses of their relative growth rates from when released from the marsupium until first breeding, showed that amphipods have a faster growth rate than isopods in the field which is consistent with other traits in their rapid development-high fecundity life-history strategy. We conclude that these data support the second hypothesis and that their morphological adaptations to a shredding, high ingestion-rate rapid gut turnover digestive strategy enable them to have a more efficient resource acquisition rate than the slower growing, lower fecundity and slower ingestion-rate longer gut throughput time strategy of most isopods.
机译：比较了葡萄牙南部Ria Formosa盐沼中3种异足动物和3种脚足动物的饮食，摄食率和生长速率，以检验以下假设：在世界范围内，两栖动物作为宏观分解者的相对成功可能是）归因于他们利用了范围明显不同的潜在可用粮食资源，并且b）归因于他们利用了相似的粮食资源，但比率不同。结合肠内容物分析，稳定同位素分析和多项选择食物偏好测试对第一个假设进行了检验。所有这三个分析的结果表明，对于上层盐沼中最丰富的潜在食物，这些物种的资源利用曲线有非常广泛的重叠。因此，第一个假设被拒绝了。第二种假设是通过适口性实验进行检验的，其中将每只测试动物的食用率与单独提供的每种潜在食物进行了比较。两栖动物吃所有五种食物的速度显着加快，每单位质量的食物消耗比等足动物多3-73倍。从有袋动物释放到首次繁殖的相对增长率的分析表明，两栖类动物的生长速度快于等足类动物，这与它们的快速发育－高繁殖力生活史策略的其他特征是一致的。我们得出的结论是，这些数据支持第二种假设，并且它们对切碎的，高摄食率的快速肠道周转消化策略的形态学适应使它们比较慢的生长，较低的繁殖力和较慢的摄食率更长的资源拥有率大多数等足动物的肠道吞吐时间策略。

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