Habitat quality assessment of wintering migratory birds in Poyang Lake National Nature Reserve based on InVEST model
In: Environmental science and pollution research: ESPR, Volume 30, Issue 11, p. 28847-28862
ISSN: 1614-7499
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In: Environmental science and pollution research: ESPR, Volume 30, Issue 11, p. 28847-28862
ISSN: 1614-7499
In: Environmental science and pollution research: ESPR, Volume 29, Issue 33, p. 49985-49997
ISSN: 1614-7499
In: Ecotoxicology and environmental safety: EES ; official journal of the International Society of Ecotoxicology and Environmental safety, Volume 155, p. 50-58
ISSN: 1090-2414
In: Land use policy: the international journal covering all aspects of land use, Volume 74, p. 15-31
ISSN: 0264-8377
In: Acta Biophysica Sinica, Volume 28, Issue 12, p. 961
In: Materials & Design, Volume 31, Issue 9, p. 4392-4397
In: Reproductive sciences: RS : the official journal of the Society for Reproductive Investigation, Volume 26, Issue 10, p. 1360-1372
ISSN: 1933-7205
In: HELIYON-D-23-18829
SSRN
In: JEMA-D-22-04799
SSRN
In: Environmental science and pollution research: ESPR, Volume 30, Issue 32, p. 79106-79119
ISSN: 1614-7499
In: Environmental sciences Europe: ESEU, Volume 34, Issue 1
ISSN: 2190-4715
Abstract
Background
The restoration of lake ecosystems requires a good knowledge of the lake's history and the driving mechanism of environmental changes. In this study, we used Lake Datong, the largest inland lake in Hunan Province China, as an example to study the effects of aquaculture, based on historical data of aquatic creature, diatom inferred-total phosphorous (DI-TP) data, and an Ecopath model. Lake Datong has undergone several stages of aquaculture from 1980, with a rapid increase in fish production and fish feed supplementation at each stage. Its water quality has deteriorated since the introduction of aquaculture and the lake has become moderate eutrophic status.
Results
According to the DI-TP data, before 1930, Lake Datong was in a mesotrophic status (50–60 μg/L DI-TP). Between 1930 and 1980, the number of nutrient-tolerant species increased slightly, which indicates a nutrient increase in the lake (66–83 μg/L DI-TP). From the 1980s to 2010 and especially since 2000, eutrophication increased rapidly, with eutrophic species dominating the diatom assemblage, such as Stephanodiscus hantzschii, S. minutulus, and a sudden decrease in Aulacoseira granulata (< 10%). The annual average DI-TP concentration was 202 μg/L. After 2010, DI-TP decreased to 127–152 μg/L. In 2019, consumer biomass in Lake Datong was very low because the large-scale aquaculture was restricted by local government. The biomass of submerged macrophytes was relatively high, indicating that excessive primary producers had not been used by consumers and therefore, had not entered the food web. This led to a reduction in the energy transfer efficiency (TE) of the ecosystem.
Conclusions
The succession of the water ecosystem of Lake Datong is reappeared by DI-TP analysis and historical reference data. Lake Datong has experienced four stages of eutrophication succession following the introduction of aquaculture activities, with dramatic changes in the composition and biomass of its aquatic creatures. After comprehensive management in 2017, the consumer biomass of Lake Datong was at a relatively lower level, and the biomass of submerged macrophytes was higher, meaning a large quantity of primary producers had not been used by consumers, thus had not entered the food web, which consequently reduces the energy TE of the ecosystem. Future management needs to pay attention to making a suitable macrophyte harvest plan, stocking herbivorous and omnivorous fish, and establishing rational fishing, which can not only enhance the energy flows and nutrient cycling of the ecosystem, but also improve the food web structure. Our results provide important reference values and theoretical support for decision-makers and stakeholders in the subsequent management of similar shallow lake-water ecosystems.
In: Materials & Design, Volume 58, p. 247-251
In: Materials & Design (1980-2015), Volume 46, p. 360-365
In: HELIYON-D-23-31798
SSRN
In: Waste management: international journal of integrated waste management, science and technology, Volume 144, p. 221-232
ISSN: 1879-2456