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Relationship between waterfowl and the seagrassRuppia maritima in a Southwestern Atlantic coastal lagoon

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Abstract

We evaluated the distribution of waterfowl in relation to a seagrass (Ruppia maritima) patch, to infauna, and on its relationship with substrate characteristics. An experiment performed in the Mar Chiquita coastal lagoon (37°46′S, 57°27′W; Argentina) was used to evaluate the effect of herbivory on widgeon grass,R. maritima. Control plots of equal size, located between bird exclosures, were exposed to herbivory. The experiment ran for 31 d, starting on December 1, 1994. Censuses showed that black-necked swan (\(\bar x = 50\) birds ha−1, SD = 37, n = 10) and coots (\(\bar x = 42\) birds ha−1, SD = 28, n = 10) were the most important (always present) of the waterfowl seen feeding onR. maritima. The results of the experiment showed greater leaf lengths, lower belowground (rhizomes and roots) biomass, greater aboveground (leaves and shoots) biomass, and greater abundance of the polychaeteHeteromastus similis in exclosure plots. There were no exclosure effects on total biomass (belowground plus aboveground), reproductive parts (fruits and pre- and postpollination flowers), or abundance of most benthic infauna. Topographic surveys showed that sediment surface was higher within theR. maritima patches, but there were no significant differences in granulometric composition. Surveys also showed that bird distribution was strongly associated with the presence ofR. maritima.

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  1. Alejandro Bortolus

    Present address: CC 573 Correo Central, 7600, Mar del Plata, Argentina

Authors and Affiliations

  1. Departamento de Biología (FCEyN), Universidad Nacional de Mar del Plata, Funes 3250, 7600, Mar del Plata, Argentina

    Alejandro Bortolus, Oscar O. Iribarne & Mariano M. Martínez

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  1. Alejandro Bortolus
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Bortolus, A., Iribarne, O.O. & Martínez, M.M. Relationship between waterfowl and the seagrassRuppia maritima in a Southwestern Atlantic coastal lagoon. Estuaries 21, 710–717 (1998). https://doi.org/10.2307/1353275

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