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Factors influencing the distribution of Hydrocharis morsus-ranae L. and Rumex hydrolapathum Huds. in a mowed low-lying marshland, Réserve de Cheyres, lac de Neuchâtel, Switzerland

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Abstract

Using environmental parameters we studied the distribution of two endangered species, Hydrocharis morsus-ranae L. and Rumex hydrolapathum Huds., in a low-lying marshland of the Swiss Plateau, a region in which aquatic vegetation is particularly threatened. A large part of the study site is regularly mown by a machine for site management purposes. The caterpillar mower digs ruts, which are especially pronounced along the tracks used to reach the mown compartment. To assess the effects of site management on these species, we have tested six environmental parameters (vegetation unit, water conductivity, water supply indicated by altitude, time elapsed since the last cut, distance from major ruts and disturbance of major ruts) that can potentially influence plant distribution. All the plots of these two species have been found in mowed compartment, which seems to indicate a correlation between site management operations and occurrences. The other factors driving the distribution of these plants are vegetation unit, distance from major ruts and water supply.

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Authors and Affiliations

  1. Laboratoire d’écologie et de biologie aquatique (LEBA), Université de Genève, 18 chemin des Clochettes, 1206, Geneva, Switzerland

    Lionel Sager

  2. Groupe d’étude et de gestion de la Grande Carçaie, Champ-Pittet, 1400, Yverdon-les-Bains, Switzerland

    Christian Clerc

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  1. Lionel Sager
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  2. Christian Clerc
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Correspondence to Lionel Sager.

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Sager, L., Clerc, C. Factors influencing the distribution of Hydrocharis morsus-ranae L. and Rumex hydrolapathum Huds. in a mowed low-lying marshland, Réserve de Cheyres, lac de Neuchâtel, Switzerland. Hydrobiologia 570, 223–229 (2006). https://doi.org/10.1007/s10750-006-0184-2

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  • DOI: https://doi.org/10.1007/s10750-006-0184-2

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