Issue |
Knowl. Manag. Aquat. Ecosyst.
Number 417, 2016
|
|
---|---|---|
Article Number | 24 | |
Number of page(s) | 4 | |
DOI | https://doi.org/10.1051/kmae/2016011 | |
Published online | 19 April 2016 |
Short communication
Dominance of Myriophyllum spicatum in submerged macrophyte communities associated with grass carp
La dominance de Myriophyllum spicatum dans les communautés de macrophytes immergées associées à la carpe amour
1
State Key Laboratory of Lake Science and Environment, Nanjing
Institute of Geography and Limnology, Chinese Academy of Sciences,
Nanjing
210008, P.R.
China
2
Department of Ecology and Institute of Hydrobiology, Jinan
University, Guangzhou
510630, P.R.
China
3
Sino-Danish Centre for Education and Research (SDC),
Beijing, P.R.
China
4
Department of Bioscience, Aarhus University,
8600
Silkeborg,
Denmark
⋆ Corresponding author:
jlyu@niglas.ac.cn
Received: 5 January 2016
Revised: 18 March 2016
Accepted: 20 March 2016
Re-establishment of macrophyte communities is a key to restore eutrophic shallow lakes. The species composition of the plant communities may change rapidly during the recovery period. A basin in subtropical Lake Qinhu (China) was restored by biomanipulation including fish removal followed by planting of submerged macrophytes in 2011. In September-December 2011, dominance of Vallisneria spinulosa and Ceratophyllum demersum shifted to dominance of Myriophyllum spicatum. Meanwhile, the CPUE (catch per unit effort) showed that the number and biomass of grass carp (Ctenopharyngodon idella) demonstrated a marked increase. Stable isotope analyses revealed that grass carp preferred V. spinulosa and C. demersum to M. spicatum. We propose that grazing by grass carp was responsible for the observed shift in dominance towards M. spicatum but as alternative explanations are possible, further tests by controlled experiments are needed to draw firm conclusions.
Résumé
La re-création de communautés de macrophytes est une clé pour restaurer les lacs peu profonds eutrophes. La composition des espèces des communautés végétales peut changer rapidement au cours de la période de récupération. Un bassin subtropical du lac Qinhu (Chine) a été restauré par biomanipulation avec l’enlèvement de poisson suivi par la plantation de macrophytes submergés en 2011. En septembre-décembre 2011, la prédominance des Vallisneria spinulosa et Ceratophyllum demersum s’est déplacée vers une dominance de Myriophyllum spicatum. Pendant ce temps, les CPUE (captures par unité d’effort) ont montré que le nombre et la biomasse de la carpe herbivore (Ctenopharyngodon idella) ont présenté une augmentation marquée. Les analyses des isotopes stables ont révélé que la carpe préfère V. spinulosa et C. demersum à M. spicatum. Nous proposons que le pâturage par la carpe amour fût responsable du changement observé dans la dominance vers M. spicatum mais comme d’autres explications sont possibles, d’autres tests par des expériences contrôlées sont nécessaires pour tirer des conclusions définitives.
Key words: grass carp / food preference / submerged macrophytes / community structure / stable isotope
Mots clés : carpe herbivore / préférence alimentaire / macrophyte submergé / structure de communauté / isotopes stables
© J. Yu et al., published by EDP Sciences, 2016
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