LeonardLegendreJeanEtAl2008

Référence

Leonard, R., Legendre, P., Jean, M., Bouchard, A. (2008) Using the landscape morphometric context to resolve spatial patterns of submerged macrophyte communities in a fluvial lake. Landscape Ecology, 23(1):91-105.

Résumé

This study investigates the spatial heterogeneity of macrophyte communities in a fluvio-lacustrine landscape. We analysed the importance of the geomorphological point/bay pattern in structuring aquatic plant assemblages inside a 20-km-long littoral segment of a large fluvial lake. The abundance of 21 macrophyte species was surveyed in 232 quadrats along 24 transects perpendicular to the lakeshore. Two contrasting plant communities were identified, corresponding to the bay and point morphology of the study zone: a bay community characterized by Chara sp. and a point community dominated by Butomus umbellatus f. vallisneriifolius, Vallisneria americana, Potamogeton richardsonii and Myriophyllum sp. We subsequently investigated the spatial patterns within the bay and point communities. From a dataset containing local environmental variables, landscape morphometric descriptors, and spatial geographical positions of the sampling sites, variation partitioning of the species abundance table showed that more than two-thirds of the explained variation was spatially structured. Around half of the spatially structured variation was due to the spatially structured environment. We identified important broad-scale patterns in the vegetation correlated to the local environmental variables, mainly depth and sediment richness. The remaining half of the spatially structured variation in the aquatic plant communities was explained by the landscape morphometric context; shoreline complexity of the bay or point, relative width, duration of wind exposure, and fetch were the landscape descriptors explaining most of this variation. Our results indicate that the landscape morphometric context can resolve as much spatial patterning as environmental variables and should be considered when studying a large lake ecosystem.

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@ARTICLE { LeonardLegendreJeanEtAl2008,
    AUTHOR = { Leonard, R. and Legendre, P. and Jean, M. and Bouchard, A. },
    TITLE = { Using the landscape morphometric context to resolve spatial patterns of submerged macrophyte communities in a fluvial lake },
    JOURNAL = { Landscape Ecology },
    YEAR = { 2008 },
    VOLUME = { 23 },
    PAGES = { 91-105 },
    NUMBER = { 1 },
    MONTH = { jan },
    AF = { Leonard, RosalieEOLEOLLegendre, PierreEOLEOLJean, MartinEOLEOLBouchard, Andre },
    DE = { Lake Saint-Francois; St. Lawrence River; submerged macrophyteEOLEOLcommunities; variation partitioning; spatial patterns; landscapeEOLEOLmorphometric context },
    PG = { 15 },
    SN = { 0921-2973 },
    TC = { 0 },
    UT = { ISI:000251796100010 },
    ABSTRACT = { This study investigates the spatial heterogeneity of macrophyte communities in a fluvio-lacustrine landscape. We analysed the importance of the geomorphological point/bay pattern in structuring aquatic plant assemblages inside a 20-km-long littoral segment of a large fluvial lake. The abundance of 21 macrophyte species was surveyed in 232 quadrats along 24 transects perpendicular to the lakeshore. Two contrasting plant communities were identified, corresponding to the bay and point morphology of the study zone: a bay community characterized by Chara sp. and a point community dominated by Butomus umbellatus f. vallisneriifolius, Vallisneria americana, Potamogeton richardsonii and Myriophyllum sp. We subsequently investigated the spatial patterns within the bay and point communities. From a dataset containing local environmental variables, landscape morphometric descriptors, and spatial geographical positions of the sampling sites, variation partitioning of the species abundance table showed that more than two-thirds of the explained variation was spatially structured. Around half of the spatially structured variation was due to the spatially structured environment. We identified important broad-scale patterns in the vegetation correlated to the local environmental variables, mainly depth and sediment richness. The remaining half of the spatially structured variation in the aquatic plant communities was explained by the landscape morphometric context; shoreline complexity of the bay or point, relative width, duration of wind exposure, and fetch were the landscape descriptors explaining most of this variation. Our results indicate that the landscape morphometric context can resolve as much spatial patterning as environmental variables and should be considered when studying a large lake ecosystem. },
    KEYWORDS = { FRESH-WATER MACROPHYTES; AQUATIC ECOSYSTEMS; VASCULAR PLANTS; ECOLOGICAL DATA; SHALLOW LAKE; DEPTH; LIGHT; RIVER; NUTRIENTS; DYNAMICS },
    OWNER = { brugerolles },
    TIMESTAMP = { 2008.01.25 },
}

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