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Annales de Limnologie - International Journal of Limnology

Volume 57 (2021) (open volume)


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Study of morphotypes and life history of six clones of Lecane bulla (Gosse, 1851) from Quintana Roo, Mexico 9

The objective of this study was to identify the presence of morphotypes L. bulla strains from Quintana Roo, México and their life history traits. Our results indicated that L. bulla has two morphotypes: large morphotype and small morphotype. The large presented short life expectancy, intrinsic positive growth, short generational time and low number of descendants, that reach sexual maturation in an accelerated manner, while in the small the opposite occurred. In conclusion, this study indicates the possible coexistence in the same geographical bioregion of two different morphotypes of L. bulla, one is a small-sized distributed in the northwest of Quintana Roo and another large-sized in the southwest.

Published online: 30 March 2021
DOI: https://doi.org/10.1051/limn/2021006

Habitat use of the Japanese eel (Anguilla japonica) and marbled eel (Anguilla marmorata) in the large subtropical Pearl River 8

This study analyzed the population structure and habitat use of the Japanese eel (Anguilla japonica) and the marbled eel (Anguilla marmorata) in the Pearl River based on data collected from 2015 to 2018. A total of 181 Japanese eels and 56 marbled eels were collected, over half of which were middle-sized eels between 255 and 600 mm in length. Although they are sister species, Japanese eels mainly inhabit complex river habitats characterized by high river fractals and coefficients of fluvial facies, while marbled eels mainly inhabit wider and deeper river sections. The results of this study showed that wild Anguilla spp. resources in the Pearl River were extremely low and there was an urgent need for conservation and management of eel resources in south China.

Published online: 18 March 2021
DOI: https://doi.org/10.1051/limn/2021001

Genetic diversity and population structure of Hemibagrus guttatus (Bagridae, Siluriformes) in the larger subtropical Pearl River based on COI and Cyt b genes analysis 7

Understanding the genetic diversity and population structure of fish species is crucial for the sustainable use and protection of fish germplasm resources. Hemibagrus guttatus (Bagridae, Siluriformes) is widely distributed in the large subtropical Pearl River (China) and is a commercially important fish. H. guttatus populations have been declining due to over-fishing, water pollution, and hydraulic constructions, it is now a wild animals under second class national protection. However, the genetic diversity of wild H. guttatus is not clear, despite its important ecological significance and its significance for conservation. In this paper, genes mitochondrial cytochrome c oxidase subunit I (COI) and cytochrome b (Cyt b) were used to analyze the genetic structure and found that there is degradation in germplasm resources of H. guttatus that could destabilize the sustainable use of this species.

Published online: 08 March 2021
DOI: https://doi.org/10.1051/limn/2021005

Effects of acute triclosan exposure on gill and liver tissues of zebrafish (Danio rerio) 6

Triclosan (TCS) is a broad-spectrum antimicrobial agent found in personal care, household, veterinary, medical, and industrial products. TCS has been detected in soil, sediment, and surface water. In the current work, the effects of acute exposure to TCS on gill and liver tissues of zebrafish were evaluated and the results indicated that TCS caused distinct histopathological alterations.

Published online: 08 February 2021
DOI: https://doi.org/10.1051/limn/2021004

Fungal richness does not buffer the effects of streams salinization on litter decomposition 5

The depressive effect of salinization on detritus processing in streams overrides the potential buffer capacity of aquatic hyphomycetes higher richness, main drivers of litter decomposition. These findings, suggest that this stressor is as worldwide threat for stream ecosystem functioning independently of the fungal species abundance.

Published online: 08 February 2021
DOI: https://doi.org/10.1051/limn/2021003
Open Access

Aquarium trade and fish farms as a source of non-native freshwater fish introductions in French Guiana 4

Investigating freshwater fish introductions in French Guiana revealed the presence of 11 non-native species. Four are established and one is rapidly increasing its spatial range. Five other species are known from few specimens, but belong to highly invasive species, making those first occurrences an early warning for potential establishment and spread.

Published online: 08 February 2021
DOI: https://doi.org/10.1051/limn/2021002

Bottom-up and top-down effects on phytoplankton functional groups in Hulun Lake, China 3

This study examines the effects of bottom-up (physical-chemical) and top-down (predation) factors on the phytoplankton functional groups in a eutrophic lake. The study revealed that the bottom-up effects of physical-chemical variables on some phytoplankton functional groups was stronger than the top-down effects of zooplankton. The study further showed that zooplankton functional groups were positively correlated with phytoplankton biomass implying that the top-down control of phytoplankton by the zooplankton in Lake Hulun is not strong enough to produce a negative effect. These finding serve as a basis for identifying how phytoplankton dynamics are influenced, which have implications for developing sustainable management strategies and conserving services of Lake Hulun and other eutrophic fresh water lakes.

Published online: 19 January 2021
DOI: https://doi.org/10.1051/limn/2020028

Effect of environment on functional traits of co-occurring water beetles 2

Our study on trait-environment relationship of co-occurring water beetles in anthropogenic ponds revealed that submerged vegetation, odonate nymphs, calcium hardness, salinity and chironomid larvae affected body size, swimming traits and functional feeding groups of the beetles in assemblages.

Published online: 07 January 2021
DOI: https://doi.org/10.1051/limn/2020030

Impacts of phosphorus loads on the water quality and the proliferation of harmful cyanobacteria in Foum-Gleita Reservoir (Mauritania) 1

The exploitation of phosphate mines contributes to the eutrophication of the Foum-Gleita reservoir (Mauritania), leading to the appearance of cyanobacterial blooms. Microcystis aeruginosa and Dolichospermum flos-aquae are the two dominant species during the hot season (May to September), and only the microcystin-LR congener was detected for the first time in a freshwater ecosystem in Mauritania with a peak at 3.55 μg L−1.

Published online: 07 January 2021
DOI: https://doi.org/10.1051/limn/2020029