scholarly journals Fish diversity in freshwater and brackish water ecosystems of Russia and adjacent waters

2020 ◽  
Vol 45 ◽  
pp. 47-116
Author(s):  
YURY V. DYLDIN ◽  
LUBOMIR HANEL ◽  
RONALD FRICKE ◽  
ALEXEI M. ORLOV ◽  
VLADIMIR I. ROMANOV ◽  
...  
Keyword(s):  
Brackish Water ◽  
Fish Diversity ◽  
Water Ecosystems

scholarly journals Fish Assemblages in Abandoned Ponds and Waterways Surrounding Brackish Water Aquaculture Ponds in Panay Island, the Philippines

2007 ◽  
Vol 19 (3) ◽  
Author(s):  
K. IKEJIMA ◽  
J.D. RONQUILLO ◽  
V.L. CORRE, JR ◽  
V.A. DUREZA
Keyword(s):  
Brackish Water ◽  
Fish Assemblages ◽  
Species Group ◽  
The Philippines ◽  
Fish Diversity ◽  
Fish Assemblage Structure ◽  
Diverse Species ◽  
Mangrove Vegetation ◽  
Aquaculture Ponds ◽  
Brackish Water Aquaculture

Fish assemblage structure in abandoned ponds and waterways in Panay Island, Philippine, were investigated and compared with those in mangrove fringed habitats. Juvenile and small resident fishes were collected using a seine net set along the beach, creeks, waterways and abandoned culture ponds. Sampling stations were characterized by the absence or presence of mangrove vegetation. Fish diversity was higher on beaches and in creeks with mangroves and in creeks without mangrove compared with abandoned ponds and waterways. Gobiidae was the most diverse species group, being abundant in most stations. More species of juveniles occurred in mangrove habitats and river banks than in abandoned ponds and waterways. However, fish abundance and biomass were not clearly different between stations. The results suggest that fish diversity decreases in areas with culture pond constructions, but these still provide habitat for gobies and juveniles of a few other species.

scholarly journals Checklist of the fresh and brackish water snails (Mollusca, Gastropoda) of Bénin and adjacent West African ecoregions

ZooKeys ◽  
2020 ◽  
Vol 942 ◽  
pp. 21-64
Author(s):  
Zinsou Cosme Koudenoukpo ◽  
Olaniran Hamed Odountan ◽  
Bert Van Bocxlaer ◽  
Rose Sablon ◽  
Antoine Chikou ◽  
...  
Keyword(s):  
West Africa ◽  
Brackish Water ◽  
Conservation Status ◽  
West African ◽  
Extensive Literature ◽  
Field Surveys ◽  
Data Deficient ◽  
Water Ecosystems ◽  
Taxonomic Studies ◽  
Biodiversity Information

Currently no comprehensive checklist of fresh and brackish water gastropods from Bénin exists, and those for adjacent West African areas are outdated. Yet, such checklists provide essential biodiversity information and a consistent taxonomic and nomenclatural framework for that biodiversity. Here a first checklist of the fresh and brackish water gastropods from Bénin and adjacent West African ecoregions is presented, based on an extensive literature review and field surveys between September 2014 and June 2019 in six major fresh and brackish water ecosystems in Bénin. This inventory includes information on synonymy, species distribution in West Africa, habitats, and conservation status. The fresh and brackish water gastropod fauna includes 60 species, belonging to 28 genera and 16 families. Pachychilidae, Ampullariidae, Neritidae, and Bulinidae were the most diverse families with 9, 8, 7, and 7 species, respectively. However, literature and field data indicated that 23 species observed in West African basins that extend to Bénin do not occur in the territory of Bénin. These species were not detected in our field surveys, most likely because they are rare at collecting sites. Of the 60 species included, five are classified as “Data Deficient”, 43 as “Least Concern”, two as “Nearly Threatened”, one as “Vulnerable”, and six as “Endangered” by the IUCN, whereas the remaining three species were not evaluated. Because the taxonomy of fresh and brackish water gastropods in West Africa is still largely based on morphology, comparative molecular and taxonomic studies may result in substantial revisions of this checklist over the coming years.

A novel salt-tolerant genotype illuminates the sucrose gene evolution in freshwater bloom-forming cyanobacterium Microcystis aeruginosa

2019 ◽  
Vol 366 (15) ◽  
Author(s):  
Yuuhiko Tanabe ◽  
Haruyo Yamaguchi ◽  
Tomoharu Sano ◽  
Masanobu Kawachi
Keyword(s):  
Microcystis Aeruginosa ◽  
Brackish Water ◽  
Evolutionary History ◽  
Gene Evolution ◽  
Water Bloom ◽  
Salt Tolerant ◽  
Whole Genome Analysis ◽  
Gene Expression Analyses ◽  
History Of ◽  
Water Ecosystems

ABSTRACT Microcystis aeruginosa is a water bloom-forming cyanobacterium found in fresh and brackish water ecosystems worldwide. Previously, we showed that several instances of M. aeruginosa bloom in brackish water can be explained by the proliferation of salt-tolerant M. aeruginosa strains harboring genes for a compatible solute sucrose. However, evolutionary history of sucrose genes in M. aeruginosa remains unclear because salt-tolerant strains have been poorly described. Here, we characterized a novel salt-tolerant strain of M. aeruginosa (NIES-4325) isolated from the brackish water of Lake Abashiri, Japan. A whole-genome analysis of M. aeruginosa NIES-4325 identified genes for sucrose synthesis (sppA, spsA and susA). Quantitative sucrose and gene expression analyses suggested that sucrose is implicated in acclimation to high salt in NIES-4325. Notably, the sucrose genes of M. aeruginosa are monophyletic, yet sucrose genes of NIES-4325 are highly divergent from those of other salt-tolerant M. aeruginosa strains. This suggests an early sucrose gene import into M. aeruginosa from other cyanobacteria, followed by multiple losses during intraspecific diversification. One of a few survivors of salt-tolerant strains is a likely donor of recent horizontal spreads of sucrose genes across M. aeruginosa lineages.

scholarly journals Effects of a natural precipitation gradient on fish and macroinvertebrate assemblages in coastal streams

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e12137
Author(s):  
Sean Kinard ◽  
Christopher J. Patrick ◽  
Fernando Carvallo
Keyword(s):  
Water Cycle ◽  
Habitat Characteristics ◽  
Predatory Fish ◽  
Fish Diversity ◽  
Precipitation Gradient ◽  
Rainfall Gradient ◽  
Coastal Prairie ◽  
Environmentally Sensitive ◽  
Water Ecosystems ◽  
Semi Arid

Anthropogenic climate change is expected to increase the aridity of many regions of the world. Surface water ecosystems are particularly vulnerable to changes in the water-cycle and may suffer adverse impacts in affected regions. To enhance our understanding of how freshwater communities will respond to predicted shifts in water-cycle dynamics, we employed a space for time approach along a natural precipitation gradient on the Texas Coastal Prairie. In the spring of 2017, we conducted surveys of 10 USGS-gauged, wadeable streams spanning a semi-arid to sub-humid rainfall gradient; we measured nutrients, water chemistry, habitat characteristics, benthic macroinvertebrates, and fish communities. Fish diversity correlated positively with precipitation and was negatively correlated with conductivity. Macroinvertebrate diversity peaked within the middle of the gradient. Semi-arid fish and invertebrate communities were dominated by euryhaline and live-bearing taxa. Sub-humid communities contained environmentally sensitive trichopterans and ephemeropterans as well as a variety of predatory fish which may impose top-down controls on primary consumers. These results warn that aridification coincides with the loss of competitive and environmentally sensitive taxa which could yield less desirable community states.

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