scholarly journals Multidecadal shifts in fish community diversity across a dynamic biogeographic transition zone

2019 ◽  
Vol 26 (1) ◽  
pp. 93-107 ◽  
Author(s):  
Brittany Troast ◽  
Richard Paperno ◽  
Geoffrey S. Cook
2017 ◽  
Vol 17 (3) ◽  
Author(s):  
Silvia Yasmin Lustosa Costa ◽  
José Etham de Lucena Barbosa ◽  
Leandro Gomes Viana ◽  
Telton Pedro Anselmo Ramos

Abstract The scale of impact that the São Francisco River transposition project will have on the drainage basins ichthyofauna is still unclear, however, changes in the fish community diversity and abundance is probable. Surveys and registries of the fish fauna within key systems of the catchment basins are priority actions for the conservation of the aquatic diversity. This study conducted a taxonomic survey of the Epitácio Pessoa (Boqueirão municipality) and Argemiro de Figueiredo (Itatuba municipality), reservoirs ichthyofauna, both belonging to the Paraíba do Norte River basin, important socioeconomic and environmental systems for the transposition project. Monthly sampling was carried out between October/2014 to September/2015 in the upstream and downstream zones of the reservoirs. The specimens were collected using dip nets, drag nets, and sieves, and placed on ice in the field. Later in the laboratory, they were transferred to 10% formaldehyde and then preserved in 70% alcohol. A total of 2,328 specimens were collected representing five orders, 14 families, and 31 species in both systems. At the upstream zones 2057 specimens were collected representing 17 species, and at the downstream zones 271 specimens were collected representing 24 species. Of the 31 species recorded, 13 species are endemic to watersheds that drain rivers from the Brazilian semi-arid region, and seven species (Apareiodon davisi, Characidium bimaculatum, Hypostomus pusarum, Parotocinclus jumbo, P. spilosoma, Pimelodella enochi, and Prochilodus brevis) are endemic to the Mid-Northeastern Caatinga Ecoregion (MNCE). Among the latter, Parotocinclus spilosoma and Pimelodella enochi are endemic to the Paraíba do Norte River. Apareiodon davisi is classified as Endangered according to the current published Brazil’s official list of endangered species of fish and aquatic invertebrates. This pre-transposition ichthyofaunistic survey will serve as a basis for future post-transposition analyzes, considering this action will change the scope of the ecosystems diversity.


2012 ◽  
Vol 32 (18) ◽  
pp. 5795-5805
Author(s):  
李捷 LI Jie ◽  
李新辉 LI Xinhui ◽  
贾晓平 JIA Xiaoping ◽  
谭细畅 TAN Xichang ◽  
王超 WANG Chao ◽  
...  

2021 ◽  
Vol 9 ◽  
Author(s):  
Teja P. Muha ◽  
Deiene Rodriguez-Barreto ◽  
Richard O'Rorke ◽  
Carlos Garcia de Leaniz ◽  
Sofia Consuegra

Artificial instream barriers are a major cause of habitat fragmentation that reduce population connectivity and gene flow by limiting fish movements. To mitigate their impacts, obsolete barriers are increasingly been removed worldwide, but few barrier removal projects are monitored. We employed a powerful Before-After-Downstream-Upstream (BADU) approach using environmental DNA (eDNA) metabarcoding to examine the effects on fish community composition of removing a weir in the river Lugg (England) that had been suggested to have a detrimental effect on salmonid migration. We found no change in fish community diversity or relative abundance after the removal above or below the weir, but detected an important effect of sampling season, likely related to the species' life cycles. eDNA detected nine fish species that were also identified by electrofishing sampling and one additional species (Anguilla anguilla) that was missed by traditional surveys. Our results suggest that monitoring of barrier removal projects should be carried out to ensure that any ecological benefits are properly documented and that eDNA metabarcoding is a sensitive technique to monitor the effects of barrier removal.


1997 ◽  
Vol 16 (12) ◽  
pp. 2556 ◽  
Author(s):  
S. Ian Hartwell ◽  
Celia E. Dawson ◽  
Eric Q. Durell ◽  
Ray W. Alden ◽  
Peter C. Adolphson ◽  
...  

2009 ◽  
Vol 19 (2) ◽  
pp. 147-156 ◽  
Author(s):  
Christina M. Cianfrani ◽  
S. Mažeika P. Sullivan ◽  
W. Cully Hession ◽  
Mary C. Watzin

2011 ◽  
Vol 29 (6) ◽  
pp. 1199-1208
Author(s):  
Xiujuan Shan ◽  
Xianshi Jin ◽  
Zhipeng Zhou ◽  
Fangqun Dai

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