The role of the electrofishing equipment type and the operator in assessing fish assemblages in a non-wadeable lowland river

2012 ◽  
Vol 125-126 ◽  
pp. 99-107 ◽  
Author(s):  
A. Specziár ◽  
P. Takács ◽  
I. Czeglédi ◽  
T. Erős
Keyword(s):  
Fish Assemblages ◽  
Lowland River ◽  
Equipment Type

scholarly journals A review on macrobenthic trophic relationships along subtropical sandy shores in southernmost Brazil

2014 ◽  
Vol 14 (3) ◽  
Author(s):  
Raphael Mathias Pinotti ◽  
Diogo Marroni Minasi ◽  
Leonir André Colling ◽  
Carlos Emílio Bemvenuti
Keyword(s):  
Surf Zone ◽  
Fish Assemblages ◽  
Trophic Levels ◽  
Trophic Relationships ◽  
Intermediate Type ◽  
Sandy Shores ◽  
Macrobenthic Assemblages ◽  
High Species Richness ◽  
Asterionellopsis Glacialis

Main trophic relationships that occur along the exposed sandy shores in southernmost Brazil (∼33° S) are established taking into account several biological compartments operating at morphodynamically distinct environments. Beaches are predominantly of the intermediate type but some stretches of coastline are truly dissipative (Cassino Beach) or tending-to-reflective (Concheiros Beach), presenting thus diverse biological compartments and inhabitant macrobenthic assemblages. Dense concentrations of the surf-zone diatom Asterionellopsis glacialis are responsible - at least for the intermediate shorelines - for the most year-round primary production, sustaining several consumers up to tertiary level. Among them, bivalves Amarilladesma mactroides, Donax hanleyanus and the hippid crabEmerita brasiliensis can account for more than 95% of all the surf-zone secondary production, in addition to the elevated biomass of the suspension-feeder polychaete Spio gaucha and the scavenger isopod Excirolana armata. Crabs, whelks, carnivorous polychaetes, seabirds and surf-zone fishes may also be present and occupy superior trophic levels depending on the beach morphodynamics. Based on the high species richness, abundance and the role of macrobenthic fauna in transferring matter and energy to seabirds and the surf-zone fish assemblages, we address this important issue on the Southwestern Atlantic ecology. Conservation efforts should be implemented for the southernmost Brazilian sandy shores, at least for those non urbanized areas.

Performance of a pool-and-weir fish pass for small bottom-dwelling freshwater fish species in a regulated lowland river

2007 ◽  
Vol 57 (4) ◽  
pp. 423-432 ◽  
Author(s):  
Evelien Maerten ◽  
Marcel Eens ◽  
Guy Knaepkens
Keyword(s):  
Freshwater Fish ◽  
Fish Species ◽  
Fish Assemblages ◽  
Regulated River ◽  
Lowland River ◽  
Stone Loach ◽  
Spined Loach ◽  
Freshwater Fish Species ◽  
Cottus Gobio ◽  
Fish Pass

AbstractAlthough small benthic freshwater fish species are an important biological component of fish assemblages and free instream movement is indispensable for their survival, they are often neglected in fish pass performance studies. In this study, a capture-mark-recapture approach was used to assess whether small bottom-dwelling species, including gudgeon (Gobio gobio), stone loach (Barbatula barbatula), spined loach (Cobitis taenia) and bullhead (Cottus gobio), were able to cross a pool-and-weir fish pass in a regulated lowland river. Some tagged individuals of stone loach (18%), gudgeon (7%) and spined loach (2%) managed to successfully ascend the fish pass under study, despite the fact that water velocity levels in the different overflows of the facility (between 0.55-1.22 m/s) exceeded the critical swimming speed of all three species. Although this suggests that a pool-and-weir fish pass is a able to facilitate upstream movement of some small benthic species in a regulated river, more detailed research incorporating advanced tagging and retrieving techniques is necessary.

The Role of Hydrology in the Polychlorinated Dibenzo-p -dioxin and Dibenzofuran Distributions in a Lowland River

2015 ◽  
Vol 44 (4) ◽  
pp. 1171-1182 ◽  
Author(s):  
Magdalena Urbaniak ◽  
Edyta Kiedrzyńska ◽  
Marcin Kiedrzyński ◽  
Marek Zieliński ◽  
Adam Grochowalski
Keyword(s):  
Lowland River

Determining diel variation in fish assemblages downstream of three weirs in a regulated lowland river

2008 ◽  
Vol 72 (1) ◽  
pp. 218-232 ◽  
Author(s):  
L. J. Baumgartner ◽  
I. G. Stuart ◽  
B. P. Zampatti
Keyword(s):  
Fish Assemblages ◽  
Diel Variation ◽  
Lowland River

scholarly journals Impacts of Urbanization on Stream Fish Assemblages: The Role of the Species Pool and the Local Environment

2020 ◽  
Vol 8 ◽  
Author(s):  
István Czeglédi ◽  
Bernadett Kern ◽  
Rita Tóth ◽  
Gábor Seress ◽  
Tibor Erős
Keyword(s):  
Fish Assemblages ◽  
Local Environment ◽  
Species Pool ◽  
Stream Fish ◽  
Stream Fish Assemblages

scholarly journals The role of season and social grouping on habitat use by Mute Swans (Cygnus olor) in a lowland river catchment

Bird Study ◽  
2013 ◽  
Vol 60 (2) ◽  
pp. 229-237 ◽  
Author(s):  
Kevin A. Wood ◽  
Richard A. Stillman ◽  
Terry Coombs ◽  
Claire Mcdonald ◽  
Francis Daunt ◽  
...  
Keyword(s):  
Habitat Use ◽  
Lowland River ◽  
River Catchment ◽  
Cygnus Olor ◽  
Social Grouping ◽  
Mute Swans
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