Redundancy in metrics describing the composition, structure, and functioning of the North Sea demersal fish community
Redundancy in metrics describing the composition, structure, and functioning of the North Sea demersal fish community
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DOI：
10.1093/icesjms/fsr188
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发表时间：
2012
影响因子：
3.3
通讯作者：
S. Greenstreet;H. Fraser;S. Rogers;V. Trenkel;S. Simpson;J. Pinnegar
中科院分区：
文献类型：
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作者：
S. Greenstreet;H. Fraser;S. Rogers;V. Trenkel;S. Simpson;J. Pinnegar
北海底层鱼类更广泛的生态系统管理目标目前侧重于恢复群落规模结构。然而，大多数政策驱动因素明确集中于恢复和保护生物多样性，并且尚未确定仅恢复底层鱼类的大小组成就足以扭转生物多样性的下降并确保社区总体健康。如果社区组成、结构和功能的不同方面独立变化，那么监测社区总体健康的各个方面将需要应用一套指标。这假设任何此类套件中使用的指标之间的冗余度较低，并且意味着专门解决生物多样性问题将需要特定生物多样性指标的明确管理目标。解决了度量冗余问题，并将覆盖群落组成、结构和功能五个主要属性的 15 个度量应用于底栖鱼调查数据。因子分析提出了对指标信息的新解释，并表明至少需要七个指标，以确保正确监测北海底层鱼类群落总体健康状况的所有变化。基于规模和物种多样性指标之间的协方差较低，这意味着群落规模结构的恢复不一定能扭转物种多样性的下降。
Broader ecosystem management objectives for North Sea demersal fish currently focus on restoring community size structure. However, most policy drivers explicitly concentrate on restoring and conserving biodiversity, and it has not yet been established that simply restoring demersal fish size composition will be sufficient to reverse declines in biodiversity and ensure a generally healthy community. If different aspects of community composition, structure, and function vary independently, then to monitor all aspects of community general health will require application of a suite of metrics. This assumes low redundancy among the metrics used in any such suite and implies that addressing biodiversity issues specifically will require explicit management objectives for particular biodiversity metrics. This issue of metric redundancy is addressed, and 15 metrics covering five main attributes of community composition, structure, and function are applied to groundfish survey data. Factor analysis suggested a new interpretation of the metric information and indicated that a minimum suite of seven metrics was necessary to ensure that all changes in the general health of the North Sea demersal fish community were monitored properly. Covariance among size-based and species-diversity metrics was low, implying that restoration of community size structure would not necessarily reverse declines in species diversity.