Zooplankton abundance, species composition and ecology of tropical high-mountain crater lake Wonchi, Ethiopia

Degefu, Fasil; Schagerl, Michael

doi:10.4081/jlimnol.2014.986

Cited by 14 publications

(19 citation statements)

References 47 publications

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“…According to the analysis of literature data and the obtained results, some planktonic invertebrates which are characteristic of small water bodies can be distinguished. Rotifers Asplanchna priodonta, Keratella cochlearis, K. quadrata, Filinia longiseta, F. terminalis, Daphnia (Daphnia) longispina [75][76][77], copepods of the genus Eudiaptomus and Acantodiaptomus [33] noted in our study were typical species of zooplankton in mountain cold-water lakes. Some plankton invertebrates are typical of plain shallow water bodies.…”

Section: Zooplankton 431 Species Composition and Quantitative Varimentioning

confidence: 91%

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The Role of External Factors in the Variability of the Structure of the Zooplankton Community of Small Lakes (South-East Kazakhstan)

Aubakirova

Krupa

Mazhibayeva³

et al. 2021

Water

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The variability of hydrochemical parameters, the heterogeneity of the habitat, and a low level of anthropogenic impact, create the premises for conserving the high biodiversity of aquatic communities of small water bodies. The study of small water bodies contributes to understanding aquatic organisms’ adaptation to sharp fluctuations in external factors. Studies of biological communities’ response to fluctuations in external factors can be used for bioindication of the ecological state of small water bodies. In this regard, the purpose of the research is to study the structure of zooplankton of small lakes in South-East Kazakhstan in connection with various physicochemical parameters to understand the role of biological variables in assessing the ecological state of aquatic ecosystems. According to hydrochemical data in summer 2019, the nutrient content was relatively high in all studied lakes. A total of 74 species were recorded in phytoplankton. The phytoplankton abundance varied significantly, from 8.5 × 107 to 2.71667 × 109cells/m3, with a biomass from 0.4 to 15.81 g/m3. Shannon diversity index of phytoplankton in the lakes at high altitude varied from 1.33 to 2.39 and from 0.46 to 3.65 in the lakes at lower altitudes. The average weight of the cells of algae species varied from 0.2079 to 1.5076 × 10−6 mg in the lakes at lower altitudes, the average weight of the cells of algae species changed from 0.6682 to 1.2963 × 10−6 mg in the lakes at higher altitudes. Zooplankton was represented by 58 taxa. The total abundance of zooplankton varied from 0.05 to 169.00 thousand ind./m3 with biomass of 0.51-349.01 mg/m3. Shannon diversity of zooplankton in the lakes at lower altitude fluctuated from 0.42 to 2.32 and it was 0.66–1.77 in the lakes at higher altitudes. The average individual mass of specimens in zooplankton in mountain lakes ranged from 0.021 to 0.037 mg and varied from 0.002 to 0.007 mg in other lakes. The main factors in the development of the structure of zooplankton communities in small lakes were temperature, TDS, the content of nitrates, phosphates, and the composition and biomass of planktonic algae. The hydrochemical and biological data of the investigated lakes indicated their organic pollution. Our results once again confirmed the applicability of structural variables of zooplankton in assessing water quality.

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Section: Zooplankton 431 Species Composition and Quantitative Varimentioning

confidence: 91%

“…In summer 2019, 58 taxa were identified in zooplankton of South-East Kazakhstan small lakes. The low species richness is characteristic for zooplankton in small lakes of different regions [35][36][37]73,74], including mountain lakes [75][76][77].…”

Section: Zooplankton 431 Species Composition and Quantitative Varimentioning

confidence: 99%

The Role of External Factors in the Variability of the Structure of the Zooplankton Community of Small Lakes (South-East Kazakhstan)

Aubakirova

Krupa

Mazhibayeva³

et al. 2021

Water

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“…Detailed investigations of the specificity of high mountain lakes is undertaken by various scientific disciplines (Choiński et al 2015). The research concerns both the biological (Korbee et al 2012;Kosolapova 2012;Degefu and Shagerl 2015) as well as physical-chemical and physical and chemical aspects (Tanaka and Tominaga 1994;Rodríguez-Rodríguez et al 2004;Santolaria et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Effect of North Atlantic Oscillation on the hydrological conditions of Lake Morskie Oko (Carphatian Mountains)

Wrzesiński

Choiński

Ptak

2016

Bulletin of Geography. Physical Geography Series

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Abstract. The paper presents the effect of North Atlantic Oscillation of macroscale atmospheric circulation (NAO) on the hydrological conditions of Lake Morskie Oko located at an altitude of 1392.8 m a.s.l. in the highest range of the Carpathians. The paper applied detailed hydrometric information from the years 1971-2010 concerning water level fluctuations, water temperature, terms of the commencement and end of ice phenomena and ice cover, as well as meteorological data concerning air temperature and atmospheric precipitation, and monthly and seasonal NAO indices. The performed analysis suggests that the majority of analysed hydrological characteristics of Lake Morskie Oko was not prone to variability of NAO intensity in its various phases. The situation results from the local conditions, particularly responsible for the course of processes and phenomena in Lake Morskie Oko, simultaneously obscuring the effect of macroscale factors.

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“…When light penetration is low within the water column, dissolved oxygen (DO) concentrations and water temperatures tend to be lower in the bottom water layers, making these habitats unsuitable for fish foraging activity but effective refuge areas for Daphnia spp. to avoid fish predation [16][17][18][19][20][21]. This Daphnia behavioral response is a survival strategy that was acquired as a result of coexistence with predators over extended periods.…”

Section: Introductionmentioning

confidence: 99%

Differences in the Vertical Distribution of Two Cladoceran Species in the Nakdong River Estuary, South Korea

Kim

Choi

2020

Water

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As cladocerans are a primary food source for fish, predator avoidance is important to sustain cladoceran populations. We hypothesized that Bosmina longirostris and Daphniaobtusa would show different vertical distributions that depend on environmental variables and their life cycle phase. Quarterly monitoring was implemented in three water column layers (upper, middle, and bottom) in the Nakdong River Estuary. Cladocerans were mostly observed during summer; B. longirostris and D.obtusa were most abundant and exhibited different vertical distributions. Large (>600 μm) D.obtusa individuals were mainly distributed in the bottom layer (9–11 m) during the daytime and in the upper layer (1–3 m) at night. Utilization of the bottom layer by large D. obtusa was possibly a defense strategy to avoid fish predation. Although the bottom layer was not supported by lower water temperatures and dissolved oxygen than the upper or middle layers, as suggested in the previous study, we assumed that high turbidity replaced this role as a place shunned by fish (and thus a refuge for Daphnia obtusa). In contrast, smaller individuals remained in the upper layer at all times because of the low predation risk. The consumption of B. longirostris by fish was low, as the largest B. longirostris (411 μm) was smaller than the small-sized Daphnia. From this finding, we suggest that the vertical distribution of cladocerans likely depends on selectivity feeding based on fish size rather than the presence/absence of fish. We considered that these results are an important advance in understanding distribution patterns of cladocerans related to environmental features, as well as their key predators.

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Zooplankton abundance, species composition and ecology of tropical high-mountain crater lake Wonchi, Ethiopia

Cited by 14 publications

References 47 publications

The Role of External Factors in the Variability of the Structure of the Zooplankton Community of Small Lakes (South-East Kazakhstan)

The Role of External Factors in the Variability of the Structure of the Zooplankton Community of Small Lakes (South-East Kazakhstan)

Effect of North Atlantic Oscillation on the hydrological conditions of Lake Morskie Oko (Carphatian Mountains)

Differences in the Vertical Distribution of Two Cladoceran Species in the Nakdong River Estuary, South Korea

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