Figure 2 - uploaded by Dimitrios K. Moutopoulos
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Food web structure in the artificial lake of Aoos, 2021-2022. The size of the circles represents proportionally the biomass per each species group, lines show the energy links between these species' groups and colour lines illustrate the intensity magnitude of these flow rates.
Source publication
The ecosystem structure of a Mediterranean high-altitude artificial lake (Aoos Springs, Northwest Greece) was assessed and quantified using the Ecopath with Ecosim model. The artificial lake was created in 1990 for hydroelectric production and the fish fauna has been enriched across years due to deliberate or accidental fish stockings, as well as t...
Contexts in source publication
Context 1
... the food web of the ALA (Figure 2), most species and taxa groups exhibited low biomass values, while detritus was estimated to have a high biomass. The TLs of the various groups ranged from 1 (for detritus and phytoplankton) to 3.88 (for aquatic birds) ( Figure 2 and Table 1). ...
Context 2
... the food web of the ALA (Figure 2), most species and taxa groups exhibited low biomass values, while detritus was estimated to have a high biomass. The TLs of the various groups ranged from 1 (for detritus and phytoplankton) to 3.88 (for aquatic birds) ( Figure 2 and Table 1). Out of the 20 groups of organisms considered, 14 exhibited EE values exceeding 0.5, indicating that their production was either fully utilised within the ecosystem or exported as catches. ...
Citations
... Thus, this tool is sufficient for use in the management of the population of Pumpkinseed in the impoundment of Aoos springs. On the other hand, the use of electrofishing with proper management results in relatively small-at least in the short term-mortality in the other species of the lake [50]. Also, although there may be spatial variations in the fishing efforts due to the possible different extents between the positions, these do not affect the results, because our study concerns a comparison of 3 years performed in the same polling positions. ...
The impoundment of Aoos springs was created in 1990 to facilitate hydroelectric production, and fish fauna has been enriched through the years due to deliberate or accidental fish stockings, with certain invasive alien fish species arising (i.e., Lepomis gibbosus, Carassius gibelio), some of which are ranked among the most dangerous species for global biodiversity. A three-year monitoring survey was conducting to map the nesting areas of Pumpkinseed, L. gibbosus, to assess the effectiveness of electrofishing as an active method to reduce the spread of the corresponding species and to identify the impact of the L. gibbosus on native species. The largest percentage of nests was found in areas with silty-sand bottoms (53.4%) and low vegetation. The potential nesting area was estimated at 1.97 km2 and the area of confirmed nesting was 0.33 km2. The species appeared to nest in a small area, compared to the potential nesting area. The results also indicate that a significant percentage of the target species (71.6% of the total number of species) was removed, with an average time per sampling of 1.2 ± 1 h, whereas the impact on the other native species was minimal. These results are important for designing and implementing programs for the eradication or reduction of L. gibbosus in the impoundment of Aoos springs.
This study delves into the ecological implications of diverse fishery patterns on aquatic ecosystems, centering on environmental parameters, species richness, and nutrient dynamics. Using the ecological fishery management model of Yangming Lake as a case, it evaluates its influence on water quality improvement, species diversity promotion, and ecosystem stability maintenance. From 2018 to 2022, the Shannon–Wiener index in Yangming Lake increased by 17.34%, and water quality significantly improved, with phytoplankton biomass decreasing by 95.5%, total nitrogen content dropping by 33.69%, and permanganate index declining by 30.75%. Although ecological fisheries demonstrate certain effectiveness in tackling invasive species, further in-depth research is needed. This study emphasizes the importance of striking a balance between fishery development and ecological protection, in line with the United Nations Food and Agriculture Organization’s “blue transformation” strategy. Our findings offer valuable insights for sustainable fisheries development and highlight the necessity of customized management strategies to protect biodiversity and ecosystem resilience. Future research will focus on exploring the long-term ecological effects of ecological fisheries and the role of native carnivorous fish in controlling invasive species.
