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Temporal and spatial concordance in community composition of phytoplankton, zooplankton, macroinvertebrate, crayfish, and fish on the Precambrian Shield

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Concordance among communities dictates how broadly we can extrapolate results derived from a set of ecosystems. We used Mantel tests to evaluate the degree of concordance in community composition among phytoplankton, zooplankton, benthic macroinvertebrate, crayfish, and fish in eight lakes near Dorset, Ontario, Canada. Spatial concordance across lakes at the decadal scale was stronger (mean Mantel r = 0.51, standard deviation (SD) = 0.20) than both intra-annual agreement (mean Mantel r = 0.38, SD = 0.20) and temporal concordance within a single lake (mean Mantel r = 0.20, SD = 0.15). The degree of temporal concordance was not related to climatic fluctuations, with the exception of increased spatial synchrony in phytoplankton communities in 1997. Strength of overall spatial concordance was most commonly related to variability in chemical attributes of the study lakes. An understanding of the determinants of concordance among taxon groups is germane to the advancement of ecology in general, as well as biodiversity conservation strategies, ecosystem monitoring, and impact diagnosis.

La concordance entre les communautés détermine dans quelle mesure on peut extrapoler les résultats obtenus dans un ensemble d’écosystèmes. Nous utilisons des tests de Mantel pour évaluer l’importance de la concordance dans la composition de peuplements de phytoplancton, de zooplancton, de macroinvertébrés benthiques, d’écrevisses et de poissons dans huit lacs près de Dorset, Ontario, Canada. La concordance spatiale entre les lacs à l’échelle des décennies est plus forte (r moyen de Mantel = 0,51; écart type (SD) = 0,20) qu’à la fois l’accord entre les années (r moyen de Mantel = 0,38; SD = 0,20) et la concordance temporelle au sein d’un même lac (r moyen de Mantel = 0,20; SD = 0,15). L’importance de la concordance temporelle n’est pas reliée aux fluctuations climatiques, à l’exception d’un synchronisme spatial accru dans les communautés de phytoplancton en 1997. La force de la concordance spatiale globale est le plus souvent reliée à la variabilité des caractéristiques chimiques des lacs étudiés. La compréhension des facteurs déterminants de la concordance entre les groupes de taxons est d’intérêt pour le progrès de l’écologie en général, de même que pour les stratégies de conservation de la biodiversité, pour la surveillance des écosystèmes et pour l’identification des impacts.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2008-05-01

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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