Results 51 to 60 of about 478 (166)

Common bully (Gobiomorphus cotidianus) and mosquitofish (Gambusia affinis) shift littoral zooplankton community composition to smaller bodied taxa

open access: yesNew Zealand Journal of Marine and Freshwater Research, Volume 59, Issue 2, Page 339-355, June 2025.
ABSTRACT We investigated the effects of native common bully (Gobiomorphus cotidianus) and non‐native western mosquitofish (Gambusia affinis) on zooplankton assemblages in an outdoor mesocosm experiment. Twenty‐one 100 L mesocosms containing zooplankton were assigned either four G. cotidianus, four G. affinis, or were left as a control group (i.e.
Flavian Ember   +2 more
wiley   +1 more source

Accounting for interspecies and intraspecies variation in swimming performance for fish passage solutions

open access: yesJournal of Applied Ecology, Volume 62, Issue 2, Page 231-241, February 2025.
Previous maximum traversable water speeds for fish passage designs have been based on average swimming ability, but this approach only enables fish that are better than the average swimmers of their species to overcome barriers. This study highlights the importance of evidence‐based designs for successful fish passage solutions to account for the ...
Rachel M. B. Crawford   +5 more
wiley   +1 more source

A Jump‐Driven Self‐Exciting Stochastic Fish Migration Model and Its Fisheries Applications

open access: yesNatural Resource Modeling, Volume 38, Issue 1, February 2025.
ABSTRACT We introduce a stochastic continuous‐time model via a self‐exciting process with jumps to describe a seasonal migration event of diadromous fish exemplified by Ayu Plecoglossus altivelis altivelis. The dynamics of the stored population at a point in a river, waiting for their upward migration, increases by the inflow of fish from the ...
Hidekazu Yoshioka, Kazutoshi Yamazaki
wiley   +1 more source

Identifying personality traits and behavioural syndromes in a threatened freshwater fish (Nannoperca vittata) through comparative analysis with a model species (Poecilia reticulata): Implications for conservation

open access: yesEcology of Freshwater Fish, Volume 34, Issue 1, January 2025.
Abstract Animal personalities are differences in behaviour among individuals of the same species that are consistent over time and contexts. The integration of animal personality into conservation actions is hampered by limited understanding of personality traits in non‐model organisms.
Nuwandi U. K. Pathirana   +3 more
wiley   +1 more source

Características poblacionales y ciclo de vida de Diplodon chilensis (d'Orbigny, 1835) (Hyriidae, Bivalvia) en el lago Gutiérrez (Patagonia, Argentina)

open access: yesEcología Austral, 2002
Diplodon chilensis (Hyriidae, Bivalvia) es uno de los moluscos más representativos de la fauna de invertebrados de las aguas dulces de la región patagónica.
Liliana Semenas, Norma Brugni
doaj  

Swimming capacity and behaviour of juvenile round goby (Neogobius melanostomus)

open access: yesEcology of Freshwater Fish, Volume 34, Issue 1, January 2025.
Abstract The round goby (Neogobius melanostomus) is an example of an invasive species where the adults are unimpressive swimmers and yet via human activities, they have managed to rapidly invade the Laurentian Great Lakes, the Baltic Sea and many rivers in Western Europe.
Eddie Chow   +4 more
wiley   +1 more source

Caracterización del hábitat de peces nativos en el río San Pedro (cuenca del rio Valdivia, Chile) Habitat characterization of native fish in the San Pedro River (Valdivia River basin, Chile)

open access: yesGayana, 2012
En sistemas fluviales, las comunidades biológicas están estructuradas principalmente por el hábitat físico. Conocer el tipo de hábitat que ocupa cada especie a lo largo de su vida es fundamental para comprender su ecología en sistemas naturales y definir
Alex García   +2 more
doaj  

Opportunistic discovery of giant kōkopu (Galaxias argenteus) spawning in a tidal reach: site description and implications

open access: yesNew Zealand Journal of Marine and Freshwater Research, Volume 58, Issue 4, Page 577-590, December 2024.
ABSTRACT This paper reports the first observation of a giant kōkopu (Galaxias argenteus) spawning site in a tidal waterway and illustrates the usefulness of DNA barcoding for opportunistic discoveries that in this case involved the collection of a single egg.
Shane Orchard, Shaun Wilkinson
wiley   +1 more source

Patrones de desplazamiento de peces nativos en el Río San Pedro (cuenca del Río Valdivia, Chile) Movement patterns of the native fish fauna of the San Pedro River (Valdivia River Basin, Chile)

open access: yesGayana, 2012
Los peces nativos chilenos se caracterizan por ser de tamaño pequeño (
Priscila Piedra   +8 more
doaj  

Optimizing eDNA Replication for Standardized Application in Lotic Systems in Aotearoa, New Zealand

open access: yesEnvironmental DNA, Volume 6, Issue 5, September–October 2024.
The objective of this study was to optimize eDNA sample replication for the consistent characterization of freshwater fish and aquatic macroinvertebrate communities in flowing New Zealand waters, and ultimately, to inform the development of robust national monitoring standards. Results indicated that six replicates were needed to consistently detect 89.
Josh Smith   +7 more
wiley   +1 more source

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