Testing predictions of changes in fish abundance and community structure after flow restoration in four reaches of a large river (French Rhône)

2015 ◽  
Vol 60 (6) ◽  
pp. 1118-1130 ◽  
Author(s):  
Nicolas Lamouroux ◽  
Jean-Michel Olivier
Keyword(s):  
Community Structure ◽  
Large River ◽  
Fish Abundance ◽  
Flow Restoration

Testing predictions of changes in benthic invertebrate abundance and community structure after flow restoration in a large river (French Rhône)

2015 ◽  
Vol 60 (6) ◽  
pp. 1104-1117 ◽  
Author(s):  
Sylvie Mérigoux ◽  
Maxence Forcellini ◽  
Jeanne Dessaix ◽  
Jean-François Fruget ◽  
Nicolas Lamouroux ◽  
...  
Keyword(s):  
Community Structure ◽  
Benthic Invertebrate ◽  
Large River ◽  
Invertebrate Abundance ◽  
Flow Restoration

Sub-fossils of cladocerans in the surface sediment of 135 lakes as proxies for community structure of zooplankton, fish abundance and lake temperature

Hydrobiologia ◽  
2003 ◽  
Vol 491 (1-3) ◽  
pp. 321-330 ◽  
Author(s):  
Erik Jeppesen ◽  
Jens Peder Jensen ◽  
Torben L. Lauridsen ◽  
Susanne L. Amsinck ◽  
Kirsten Christoffersen ◽  
...  
Keyword(s):  
Community Structure ◽  
Surface Sediment ◽  
Fish Abundance ◽  
Lake Temperature

scholarly journals The influence of natural flow and temperature and introduced brown trout on the temporal variation in native fish abundance in a “reference” stream

2019 ◽  
Vol 76 (5) ◽  
pp. 705-722 ◽  
Author(s):  
John W. Hayes ◽  
Eric O. Goodwin ◽  
Joanne E. Clapcott ◽  
Karen A. Shearer
Keyword(s):  
Temporal Variation ◽  
Life Histories ◽  
Fish Community ◽  
River Flow ◽  
Fish Population ◽  
Large River ◽  
Fish Abundance ◽  
Native Fish ◽  
Natural Flow ◽  
Upper South

Understanding what drives variation in fish abundance at reference sites provides perspective for assessing the effects of human alterations to river flow and land use. We examined temporal variation in fish community abundance in a headwater tributary of a large river in the upper South Island (New Zealand) over 10 years. We were interested in the influence of natural flow variation and temperature on native fish abundance within the context of potential competition/predation pressure from juvenile introduced trout. Results from biannual sampling highlighted the dominating influence of floods on fish population dynamics, overriding biotic effects. We found no evidence for adverse effects of trout on native fish, and flow-related habitat performed more poorly in explaining variation in fish abundance than low- and median-flow statistics. Differences in temporal variation in abundance between species were largely consistent with life histories that provide resistance and (or) resilience to flood flows and relative insensitivity to low flows. Long-term data (≥10 years) are needed for detecting meaningful trends and quantifying the effects of human activities on fish community abundance.

Denitrification in a large river: consideration of geomorphic controls on microbial activity and community structure

Ecology ◽  
2013 ◽  
Vol 94 (10) ◽  
pp. 2249-2262 ◽  
Author(s):  
Corianne Tatariw ◽  
Elise L. Chapman ◽  
Ryan A. Sponseller ◽  
Behzad Mortazavi ◽  
Jennifer W. Edmonds
Keyword(s):  
Community Structure ◽  
Microbial Activity ◽  
Large River

scholarly journals Fish community structure of Juramento reservoir, São Francisco River basin, Minas Gerais, Brazil

2006 ◽  
Vol 23 (3) ◽  
pp. 832-840 ◽  
Author(s):  
André R. M. Silva ◽  
Gilmar B. Santos ◽  
Thiago Ratton
Keyword(s):  
Community Structure ◽  
Native Species ◽  
Fish Community ◽  
Fish Fauna ◽  
Fish Abundance ◽  
Fish Community Structure ◽  
Migratory Species ◽  
Wet Season ◽  
Dry Period ◽  
The Relationship

Many rivers in Brazil as the São Francisco (SFR) have been impounded for reservoirs construction purposes. However, there is a lack of knowledge on their fish fauna in many areas, including headwaters. The present study aimed to describe the fish community structure from Juramento reservoir, located on Juramento River, a branch of SFR basin. Six bimonthly samplings were made in four different sites. Gill and cast nets, beach seines and sieves were used to collect fish. Ecological indexes as well as the relationship between fish abundance and some limnological variables were determined. 3288 fish belonging to 33 species (16.5% of the total described for SFR basin) were captured, being 75.7% Characiformes, 18.1% Siluriformes, 3% Cyprinodontiformes and 3% Gymnotiformes. Only two non-native species, 'tamboatá' - Hoplosternum littorale (Hancock, 1828) and 'trairão' - Hoplias lacerdae Ribeiro, 1908 were found. The highest catches in number occurred in the dry period (March-October) and the lowest one in the wet season (November-February). Diversity was higher at Barragem station and richness did not vary between reservoir zones. Five migratory species were found downstream of the dam (four exclusively there), whereas only the 'curimbatá-pioa' - Prochilodus costatus Valenciennes, 1850 occurred in the reservoir. The low observed correlations between fish abundance and the limnological variables utilized suggest that the local fish fauna is not strongly affected by their variation.

Effects of the cleaner fish Labroides dimidiatus on grazing fishes and coral reef benthos

2020 ◽  
Vol 643 ◽  
pp. 99-114
Author(s):  
AS Grutter ◽  
S Bejarano ◽  
KL Cheney ◽  
AW Goldizen ◽  
T Sinclair-Taylor ◽  
...  
Keyword(s):  
Community Structure ◽  
Benthic Community ◽  
Foraging Behaviour ◽  
Fish Abundance ◽  
Fish Diversity ◽  
Benthic Community Structure ◽  
Group Foraging ◽  
Cleaner Fish ◽  
Labroides Dimidiatus ◽  
Positive Effect

Territorial and roving grazing fishes farm, and feed on, algae, sediment, or detritus, thus exerting different influences on benthic community structure, and are common clients of cleaner fish. Whether cleaners affect grazing-fish diversity and abundance, and indirectly the benthos, was tested using reefs maintained free of the bluestreak cleaner wrasse Labroides dimidiatus for 8.5 yr (removals) compared with controls. We quantified fish abundance per grazing functional group, foraging rates of roving grazers, cleaning rates of roving grazers by L. dimidiatus, reef benthos composition, and fouling material on settlement tiles. Abundances of ‘intensive’ and ‘extensive’ territorial farmers, non-farmers, parrotfishes and Acanthurus spp. were lower on removal than control reefs, but this was not the case for ‘indeterminate’ farmers and Ctenochaetus striatus. Foraging rates of Acanthurus spp. and C. striatus were unaffected by cleaner presence or cleaning duration. This suggests some robustness of the grazers’ foraging behaviour to loss of cleaners. Acanthurus spp. foraged predominantly on sediment and detritus, whereas C. striatus and parrotfishes grazed over algal turfs. Nevertheless, benthic community structure and amount of organic and inorganic material that accumulated over 3.5 mo on tiles were not affected by cleaner presence. Thus, despite greater abundances of many roving grazers, and consequently higher grazing rates being linked to the presence of cleaners, the benthos was not detectably affected by cleaners. This reveals that the positive effect of cleaners on fish abundance is not associated with a subsequent change in the benthos as predicted. Rather, it suggests a resilience of benthic community structure to cleaner-fish loss, possibly related to multiple antagonistic effects of different grazer functional groups. However, losing cleaners remains a problem for reefs, as the lack of cleaning has adverse consequences for fish physiology and populations.

scholarly journals Impacts of biogenic polyunsaturated aldehydes on metabolism and community composition of particle-attached bacteria in coastal hypoxia

2021 ◽  
Vol 18 (3) ◽  
pp. 1049-1065
Author(s):  
Zhengchao Wu ◽  
Qian P. Li ◽  
Zaiming Ge ◽  
Bangqin Huang ◽  
Chunming Dong
Keyword(s):  
Community Structure ◽  
Bottom Layer ◽  
Large River ◽  
Bacterial Respiration ◽  
High Dose ◽  
Low Oxygen ◽  
Oxygen Utilization ◽  
Salt Wedge ◽  
Attached Bacteria ◽  
Polyunsaturated Aldehydes

Abstract. Eutrophication-driven coastal hypoxia has been of great interest for decades, though its mechanisms remain not fully understood. Here, we showed elevated concentrations of particulate and dissolved polyunsaturated aldehydes (PUAs) associated with the hypoxic waters in the bottom layer of a salt-wedge estuary. Bacterial respiration within the hypoxic waters was mainly contributed by particle-attached bacteria (PAB) (> 0.8 µm), with free-living bacteria (0.2–0.8 µm) only accounting for 25 %–30 % of the total rate. The concentrations of particle-adsorbed PUAs (∼ 10 µmol L−1) in the hypoxic waters were directly quantified for the first time based on large-volume filtration and subsequent on-site PUA derivation and extraction. PUA-amended incubation experiments for PAB (> 25 µm) associated with sinking or suspended particles retrieved from the low-oxygen waters were also performed to explore the impacts of PUAs on the growth and metabolism of PAB and associated oxygen utilization. We found an increase in cell growth of PAB in response to low-dose PUAs (1 µmol L−1) but an enhanced cell-specific bacterial respiration and production in response to high-dose PUAs (100 µmol L−1). Improved cell-specific metabolism of PAB in response to high-dose PUAs was also accompanied by a shift of PAB community structure with increased dominance of the genus Alteromonas within the Gammaproteobacteria. We thus conclude that a high PUA concentration associated with aggregate particles within the bottom layer may be crucial for some species within Alteromonas to regulate PAB community structure. The change in bacteria community could lead to an enhancement of oxygen utilization during the degradation of particulate organic matter and thus likely contribute to the formation of coastal hypoxia. These findings are potentially important for coastal systems with large river inputs, intense phytoplankton blooms driven by eutrophication, and strong hypoxia developed below the salt-wedge front.

scholarly journals Abundance, distribution, and habitat use of fishes in a large river (Danube, Austria): mobile, horizontal hydroacoustic surveys vs. a standard fishing method

2020 ◽  
Vol 77 (5) ◽  
pp. 1966-1978
Author(s):  
Philip Kerschbaumer ◽  
Michael Tritthart ◽  
Hubert Keckeis
Keyword(s):  
Habitat Use ◽  
Three Dimensional ◽  
Large River ◽  
Fish Abundance ◽  
Danube River ◽  
Fish Length ◽  
Specific Information ◽  
Catch Per Unit Effort ◽  
Temporal And Spatial Distribution ◽  
Imaging Sonar

Abstract We tested a novel approach for fish abundance and size estimates along a 3.6-km reach in the main stem of a free-flowing section of the Danube River east of Vienna. We deployed an adaptive resolution imaging sonar (ARIS) with horizontal beam orientation from a moving boat in order to assess spatial and temporal fish abundance distributions in different mesohabitats. To validate the results obtained from imaging sonar, hydroacoustic abundance and fish length estimates were compared with those received from boat electrofishing surveys conducted at the same time and place. Furthermore, fish occurrence was related to hydraulic conditions based on a three-dimensional hydrodynamic model in order to reveal patterns of habitat use. Hydroacoustic abundance expressed as catch per unit effort estimates deviated significantly from fish abundances assessed by boat electrofishing, but when comparing relative abundances both methods yielded a similar spatial and temporal pattern. Total fish length estimates obtained from the two methods did not differ significantly. The mobile application of the non-invasive ARIS technology offers the opportunity to quickly gain detailed information on fish abundance and position of individuals. This yields more specific information on temporal and spatial distribution patterns, habitat use and fish size distributions in large rivers.

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