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首页> 外文期刊>Estuarine Coastal and Shelf Science >Are coastal lagoons physically or biologically controlled ecosystems? Revisiting r vs. K strategies in coastal lagoons and estuaries
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Are coastal lagoons physically or biologically controlled ecosystems? Revisiting r vs. K strategies in coastal lagoons and estuaries

机译：沿海泻湖是物理还是生物控制的生态系统？重温沿海泻湖和河口的河与河策略

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摘要

Environmental stress influences biological assemblages, with species responding to stress by adopting particular life-history strategies (e.g., r vs. K). Coastal lagoons and estuaries are considered naturally stressed and physically controlled systems with frequent environmental disturbances and fluctuations. At the same time, their transitional nature (between terrestrial, freshwater and marine) makes them especially vulnerable to human impacts and land and freshwater inputs. As a result, it is hypothesised that residents of coastal lagoons would display characteristics of r-selected species. The r-strategy involves increased reproductive effort through early reproduction, small and numerous offspring with a large dispersive capability, short lifespan and small adult body size. Together, these traits provide a selective advantage in such unpredictable or short-lived environments. Alternatively, immigrants to coastal lagoons should mostly be K-strategists, with a competitive advantage over the r-strategists, at least on a temporary time scale. These hypotheses were explored using a dataset from 73 Atlanto-Mediterranean sites: 27 estuaries, 42 coastal lagoons and 4 from the sea, obtained from published sources. A detailed analysis of the distributions of the different resident fish species according to lagoon characteristics indicated that in lagoons with a higher marine influence the families Cobiidae, Blenniidae and Syngnathidae were common, while lagoons with freshwater influence are characterized by Cypri-nidae and other freshwater species. In analyzing the biological strategies of lagoon species we found that fish assemblages inhabiting marine influenced lagoons were characterized by solitary, necto-benthonic sedentary species. These species are often hermaphroditic, with benthic broods and many exhibit brooding behaviour. This suggests that marine influenced lagoons are dominated by /(-strategist species, while r-strategy species will be more common in freshwater lagoons and among marine migrant species.
机译：环境胁迫会影响生物群落，物种通过采取特定的生活史策略（例如r vs.K）来应对胁迫。沿海泻湖和河口被认为是受到自然压力和物理控制的系统，并具有频繁的环境干扰和波动。同时，它们的过渡性质（在陆地，淡水和海洋之间）使它们特别容易受到人类影响以及土地和淡水输入的影响。结果，假设沿海泻湖的居民将表现出r选择物种的特征。 R策略涉及通过早期生殖，具有分散能力大，寿命短和成年体形小的后代，数量众多的后代来增加生殖力。这些特性共同在这种不可预测或短暂的环境中提供了选择优势。另外，移民到沿海泻湖的人应该主要是K-战略家，至少在临时范围内，与R-战略家相比具有竞争优势。使用来自73个大西洋-地中海站点的数据集对这些假设进行了探索：从公开来源获得的27个河口，42个沿海泻湖和4个来自海洋的海域。根据泻湖特征对不同鱼类的分布进行了详细分析，结果表明，在海洋影响较大的泻湖中，科比科，B科和and科科是常见的，而具有淡水影响的泻湖以Cy科和其他淡水物种为特征。 。在分析泻湖物种的生物学策略时，我们发现居住在受海洋影响的泻湖中的鱼类群具有孤立的，necto-benthonic久坐物种的特征。这些种类通常是雌雄同体的，底栖鱼类，许多表现出鱼类的行为。这表明，受海洋影响的泻湖以/（-策略物种）为主，而r-策略物种将在淡水泻湖和海洋移民物种中更为常见。

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