Comparative growth and feeding in zebra and quagga mussels (Dreissena polymorpha and Dreissena bugensis): implications for North American lakes

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Abstract:

In laboratory experiments, quagga mussels (Dreissena bugensis) survived as well as zebra mussels (Dreissena polymorpha) and equaled or exceeded their growth rate (–3 to 242% change in wet mass) when reared at 6 or 23°C and fed natural seston or Chlamydomonas at food levels ranging from 0.05–7.4 µg·L–1 chlorophyll a (chl a). Superior growth of quagga mussels was most pronounced at low food levels. We found no significant differences in per capita clearance rates (CR), functional responses, or feeding behavior between zebra and quagga mussels fed Chlamydomonas, Nannochloris, or mixed suspensions of Nannochloris and clay. Per capita CR ranged from 0.018 to 0.402 L·mussel–1·h–1 for zebra mussels and from 0.010 to 0.407 L·mussel–1·h–1 for quagga mussels. Because quagga mussels had more biomass per unit shell length, we found lower biomass-specific CR for quagga mussels. When fed natural seston, zebra and quagga mussels could selectively reject inorganic material and at the lowest seston level the assimilation efficiency of quagga mussels (81%) was significantly higher than that of zebra mussels (63%). Our experiments suggest that quagga mussels can survive, grow, and feed as well or better than zebra mussels in epilimnetic waters with either low or high productivity.

En laboratoire, des moules quagga (Dreissena bugensis) gardées à 6 ou 23°C et nourries de seston naturel ou de Chlamydomonas en concentrations de 0,05–7,4 µg·L–1 chlorophylle a (chl a) survivent aussi bien que les moules zébrées (Dreissena polymorpha) et leur taux de croissance est semblable ou supérieur (–3 à 242 % de changement dans la masse humide). La croissance supérieure des moules quagga est surtout évidente aux concentrations faibles de nourriture. Il n'y a pas de différences individuelles significatives dans les taux d'épuration (CR), les réponses fonctionnelles ou les taux d'alimentation entre les moules zébrées et les moules quagga nourries de Chlamydomonas, de Nannochloris ou de suspensions mixtes de Nannochloris et d'argile. Les taux individuels d'épuration (CR) varient de 0,018 à 0,402 L·moule–1·h–1 chez les moules zébrées et de 0,010 à 0,407 L·moule–1·h–1 chez les moules quagga. Parce que la biomasse par unité de longueur de coquille est plus grande chez les moules quagga, celles-ci ont un CR relatif à la biomasse plus petit. Les moules quagga et les moules zébrées, nourries de seston naturel, savent rejeter de façon sélective les particules inorganiques et, à la concentration la plus faible de seston, l'efficacité de l'assimilation des moules quagga (81 %) est significativement plus élevée que celle des moules zébrés (63 %). Il semble donc que les moules quagga puissent survivre, croître et s'alimenter aussi bien, sinon mieux, que les moules zébrées dans les eaux de l'épilimnion de forte ou de faible productivité.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: April 1, 2002

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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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