A New Concept of Frontal Migration System for Fish ‒ for Overflow Weirs and River Sills

Voicu, Răzvan; Voicu, Liliana; Radecki‐Pawlik, Artur; Bănăduc, Doru; Plesiński, Karol

doi:10.2478/trser-2022-0007

Cited by 2 publications

(2 citation statements)

References 32 publications

(1 reference statement)

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“…The recent rapid natural expansion of the range of the racer goby Babka gymnotrachelus (Kessler, 1857) is one of the mechanisms of natural diversification, and it is a threat to the native biodiversity of the mountainous tributaries of the Dniester River. Due tovarious degradation types of the natural habitats in the Carpathian mountain basin [21][22][23][24][25][26][27][28], the high adaptive potential and ecological flexibility of the species catalyzed its expansion in many European water courses, particularly in the Dniester basin [10,14,29].…”

Section: Introductionmentioning

confidence: 99%

Morphological and Trophic Features of the Invasive Babka gymnotrachelus (Gobiidae) in the Plain and Mountainous Ecosystems of the Dniester Basin: Spatiotemporal Expansion and Possible Threats to Native Fishes

Afanasyev,

Hupalo,

Tymoshenko

et al. 2023

Fishes

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Over the last few years, the racer goby B. gymnotrachelus quickly expanded in the mountainous rivers of the Dniester basin at aheight of 300 m a.s.l. and above. The occurrence frequency of the racer goby in fish communities in the mountainous rivers of the Carpathian ecoregion remains low (up to 20%), as compared with the plain rivers, where the species occurs in 70–100% of cases. The major prey groups in its diet in both plain and mountainous were Chironomidae, Diptera, and Crustacea. Chironomidae formed the maximal portion (35% at an occurrence frequency of 72.5%), and Trichoptera formed 18%at an occurrence frequency of 41%, whereas fish larvae were absent in their diet in mountainous rivers. The peculiar environmental conditions of mountainous rivers caused the adaptive modifications of the morphological features of the racer goby at the subpopulation level, which compriseda decrease inthe specimens’ size in rivers with a flow velocity of above 1.5 m/s and rivers with pebble contentsof above 50%in the bottom sediments.The modifications showed an increase inbody streamlining as an adaptation to flow velocity and turbulence and the stony substrate of the river’s bottom. Thus, the morphological adaptation of B. gymnotrachelus to the conditions of the mountainous rivers is in progress, and the formationof astable population in these rivers can be expected. In contrast, the native fish species’ resilience in the face of newcomers is still high, and this is because their alevins are not food for invaders.

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Section: Introductionmentioning

confidence: 99%

Morphological and Trophic Features of the Invasive Babka gymnotrachelus (Gobiidae) in the Plain and Mountainous Ecosystems of the Dniester Basin: Spatiotemporal Expansion and Possible Threats to Native Fishes

Afanasyev,

Hupalo,

Tymoshenko

et al. 2023

Fishes

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“…Most of them are field-based methods that require the identification of macroinvertebrates at the family level, as well as a previous assignation of sensitivity weightings to each taxon, based on their tolerance to water-quality impairment. However, exploring methods well-founded from the ecological point of view, for example, using the changes in macroinvertebrate composition (abundance, dominance or biomass) as a response to disturbances in the system is, to date, less common [BROWN 2001;ISMAEL, DORGHAM 2003;VOICU et al 2022].…”

Section: Introductionmentioning

confidence: 99%

Journal of Water and Land Development

2022

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The Water Framework Directive (Directive 2000/60/EC) emphasises the need for simple tools and studies to characterise aquatic ecosystems. A wide range of methods has been developed, including different groups of biota and different taxonomic resolutions. Among these, the abundance biomass comparison (ABC) method is an important methodology widely used in marine benthic systems and well-founded from the ecological point of view. This method -with a slight modification using genera and families instead of species -was applied in a Mediterranean river (Eliche-Frío, northeast of Andalusia, Spain) using the macroinvertebrate community, together with the Margalef richness index and the Iberian BioMonitoring Working Party (IBMWP) to determine the quality of the water. The obtained results show the suitability of the ABC curves method to analyse the macroinvertebrate community and estimate the ecological status of river ecosystems. Although both, the genus and family aggregations, showed a similar trend, the values obtained with the family level indicate a worse state of contamination than those shown with the genus level. The comparison between genus and family levels with other biological indices shows that the evaluation obtained with family aggregation is more similar to those obtained with the Margalef and IBMWP indices than the evaluation based on genera; therefore, we could conclude that this level of taxonomic resolution is adequate for the use of the ABC method in assessing the ecological status of Mediterranean rivers.

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A New Concept of Frontal Migration System for Fish ‒ for Overflow Weirs and River Sills

Cited by 2 publications

References 32 publications

Morphological and Trophic Features of the Invasive Babka gymnotrachelus (Gobiidae) in the Plain and Mountainous Ecosystems of the Dniester Basin: Spatiotemporal Expansion and Possible Threats to Native Fishes

Morphological and Trophic Features of the Invasive Babka gymnotrachelus (Gobiidae) in the Plain and Mountainous Ecosystems of the Dniester Basin: Spatiotemporal Expansion and Possible Threats to Native Fishes

Journal of Water and Land Development

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