Long-term effects of fish biomanipulation and macrophyte management on zooplankton functional diversity and production in a temperate shallow lake

Eutrophication still is one of the greatest anthropogenic impacts affecting aquatic ecosystems. Food web manipulations to reverse eutrophic conditions have been applied, mainly by reducing fish stocks. However, the long-term results of biomanipulation are still ambiguous. The objective of this study...

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Bibliographic Details
Published in:Limnology 2020-08, Vol.21 (3), p.305-317
Main Authors: Setubal, Rayanne Barros, Riccardi, Nicoletta
Format: Article
Language:English
Subjects:
Anthropogenic factors
Aquatic crustaceans
Aquatic ecosystems
Aquatic plants
Biomanipulation
Biomass
Biomedical and Life Sciences
Body size
Chlorophyll
Chlorophyll a
Crustaceans
Diversity indices
Ecology
Environment
Eutrophic environments
Eutrophic lakes
Eutrophication
Feeding
Feeding behavior
Feeding preferences
Fish
Fish stocks
Food chains
Food webs
Freshwater & Marine Ecology
Herbivores
Human influences
Lakes
Life Sciences
Littoral environments
Long-term effects
Macrophytes
Plankton
Research Paper
Shellfish
Temporal variations
Trends
Zooplankton
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Summary:Eutrophication still is one of the greatest anthropogenic impacts affecting aquatic ecosystems. Food web manipulations to reverse eutrophic conditions have been applied, mainly by reducing fish stocks. However, the long-term results of biomanipulation are still ambiguous. The objective of this study was to evaluate biomanipulation effects on zooplankton functional diversity and production during 24 years of monitoring a shallow temperate lake. Temporal variation in crustacean biomass (CB), zooplankton resource use efficiency (RUE), limnological variables, functional diversity indices and functional traits were assessed using the Mann–Kendall test. The effects of the limnological and functional variables on zooplankton production (CB and RUE) were analyzed by generalized least squares models (GLSs). We found decreasing trends for almost all the limnological variables, indicating a reduction in lake eutrophic conditions. We also observed a decreasing trend in functional traits related to pelagic habitat, filter-feeding mode, herbivore feeding preference and body size. The GLS results showed that functional dispersion and chlorophyll a are important determinants of zooplankton production. The effects of fish biomanipulation produced no significant temporal trends in zooplankton biomass. In fact, the increase in submerged macrophytes promoted littoral food webs, which was likely the main determining factor of the changes in zooplankton functional traits and production.
ISSN:1439-8621
1439-863X
DOI:10.1007/s10201-020-00617-z