Issue |
Knowl. Manag. Aquat. Ecosyst.
Number 420, 2019
|
|
---|---|---|
Article Number | 32 | |
Number of page(s) | 6 | |
DOI | https://doi.org/10.1051/kmae/2019025 | |
Published online | 24 June 2019 |
Research Paper
Omnivorous shrimp Neocaridina denticulata sinensis enhances the growth of submerged macrophyte Vallisneria denseserrulata
La crevette omnivore Neocaridina denticulata sinensis favorise la croissance du macrophyte submergé Vallisneria denseserrulata
1
Department of Ecology and Institute of Hydrobiology, Jinan University, Guangzhou 510632, PR China
2
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing 210008, PR China
3
Sino-Danish Center, University of the Chinese Academy of Sciences, Beijing 101408, PR China
* Corresponding author: zliu@niglas.ac.cn
Received:
13
March
2019
Accepted:
7
June
2019
Lake eutrophication often causes declines and even losses of submerged macrophytes through the shading effects of increased periphyton and phytoplankton. The Chinese swamp shrimp Neocaridina denticulata sinensis Kemp (Decapoda, Atyidae) is a common omnivore in Chinese lakes, where its presence may impact both periphyton and phytoplankton, with previously unstudied consequences for submerged macrophytes. Here, using a mesocosm experiment, we studied the effect of N. d. sinensis on periphyton, phytoplankton and the submerged macrophyte Vallisneria denseserrulata. Results showed that in the presence of N. d. sinensis, the biomass of periphyton on the leaves of V. denseserrulata was significantly reduced, and that growth rate of V. denseserrulata increased. The presence of N. d. sinensis also significantly increased the total phosphorus concentrations in the water column and phytoplankton biomass (chlorophyll-a). The enhanced growth of V. denseserrulata is likely to be linked to improved light harvesting due to the reduced periphyton attached to their leaf surface. The results suggest that stocking with Chinese swamp shrimps may enhance the development of macrophytes in eutrophic shallow lakes.
Résumé
L'eutrophisation des lacs entraîne souvent des déclins, voire des pertes de macrophytes submergés en raison des effets d'ombrage dus à l'augmentation du périphyton et du phytoplancton. La crevette des marais chinois Neocaridina denticulata sinensis Kemp (Decapoda, Atyidae) est un omnivore commun dans les lacs chinois, où sa présence peut avoir un impact sur le périphyton et le phytoplancton, avec des conséquences non étudiées auparavant pour les macrophytes immergés. Ici, à l'aide d'une expérience en mésocosme, nous avons étudié l'effet de N. d. sinensis sur le périphyton, le phytoplancton et le macrophyte immergé Vallisneria denseserrulata. Les résultats ont montré qu'en présence de N. d. sinensis, la biomasse de périphyton sur les feuilles de V. denseserrulata était considérablement réduite et que le taux de croissance de V. denseserrulata augmentait. La présence de N. d. sinensis a également augmenté de façon significative les concentrations de phosphore total dans la colonne d'eau et la biomasse phytoplanctonique (chlorophylle-a). La croissance accrue de V. denseserrulata est probablement liée à une meilleure captation de la lumière en raison de la réduction du périphyton attaché à la surface de leurs feuilles. Les résultats suggèrent que l'ensemencement de crevettes des marais chinois pourrait favoriser le développement de macrophytes dans les lacs eutrophes peu profonds.
Key words: omnivorous shrimp / submerged macrophytes / periphyton / eutrophication
Mots clés : crevette omnivore / macrophyte submergé / périphyton / eutrophisation
© J. Ye et al., Published by EDP Sciences 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License CC-BY-ND (http://creativecommons.org/licenses/by-nd/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. If you remix, transform, or build upon the material, you may not distribute the modified material.
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