《Wetland Ecology and Manganment》杂志刊登“用鱼类群集作为河口生态系统健康的指标”

作者：Marcus Sheaves,Rose Johnston,Rod M.Connolly

刊物：《Wetland Ecology and Manganment》，2012

关键词：监控、评价、环境变化、CPUE、捕获概率、多样性指数

摘要：了解并管理多种多样的人为压力对河口带来的日益增加的胁迫，需要确定监测指标并进行影响评估来提供变化的精确数据且具有易读性。尽管基于自游生物组合结构的指标明显受管理者青睐，然而最精确方法的产生是必然的，这可能经历了从简单的合成法（例如多样化指标）到复杂多元法的过程。然而，复杂的方法通常为报告提供的基础较为薄弱，因为它们很难生成明确的报告并为最终用户提供有意义的信息。有效的指标应该易于构建和沟通，并与可定义的生物属性直接相关，对于没有受到影响的系统预测其范围，对于已知的影响具有明显的反应。我们利用30个自然和2个人工河口的自游生物数据产生了一套符合这些标准的基于自游生物组合的方法。我们根据单位捕获量（CPUE）和相遇概率（POE）评价了一套简单的并行方法。并行方法提供了补充信息，从而能更好的评估所发生的变化。只要是限于一年内的相同时期并消除了季节变化的影响，三种方法将达到一致的界限，并且能有效的区分出退化河口。成功的方法依赖于相遇概率而不是单位捕获量，它们有相当大的策略优势因为（它们）的破坏性较小，允许收集更多的单位时间样本，以及能平等地对待群集以及非群集物种。

Fish assemblages as indicators of estuary ecosystem health

Authors:  Marcus Sheaves, Rose Johnston, Rod M.Connolly

Journal:  Wetland Ecology and Manganment,2012

Key words: Monitoring; Assesment; Environmental change; CPUE;Probability of encounter; Diversity indices

Abstract: Understanding and managing increasing threat from diverse anthropogenic pressures on estuaries requires impact assessment and monitoring indices that provide accurate quantification of change and are readily communicable. Although indices based on nekton assemblage structure have obvious appeal to managers, the imperative to produce the most accurate measures possible has seen a move away from simple composite measures (such as diversity indices) towards complex multivariate approaches. However, complex methods often provide a poor basis for reporting because they can be difficult to report in terms that are meaningful to the end user. Effective indices should be simple to construct and communicate, relate directly to definable biological attributes, fall within predictable ranges for unimpacted systems and show demonstrable responses to known impacts. We use published nekton data for 30 natural and two artificial estuaries to develop a set of nekton assemblage-based summary measures that fit these criteria. We evaluated a suite of simple parallel measures based on both catch per unit effort (CPUE) and probability of encounter (PoE). Parallel measures provide complementary information thus a more robust assessments of change. Three measures fell within consistent bounds as long as comparisons were confined to the same time of year to remove the influence of seasonal variability, and were efficient at differentiating degraded from unimpacted estuaries. Because the successful approaches rely on PoE rather than CPUE they have considerable tactical advantages in that they are less destructive, allow for the collection of many more samples per unit time, and treat schooling and non-schooling species equivalently.

原文链接：http://link.springer.com/article/10.1007/s11273-012-9270-6