Do alpine macroinvertebrates recover differently in lakes and rivers after alien fish eradication?

Tiberti, Rocco; Brighenti, Stefano

doi:10.1051/kmae/2019029

Cited by 3 publications

(2 citation statements)

References 44 publications

(79 reference statements)

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“…by a process of triploidisation, thus preventing hybridization with native species downstream. However, massive fish introductions can significantly impact the structure and functioning of freshwater ecosystems, due to interactions with the native communities and recipient environments, including increased competition, predation, biogenic modification of the environment, and potential spreading of diseases [121,122,123,124,125,126]. Therefore, the sustainability of this management strategy must be considered with extreme caution, carefully assessed, and regularly monitored after implementation.…”

Section: Current Risks Of Stocking Non-native S Ghigii In Northern Italymentioning

confidence: 99%

The Italian Alpine and Subalpine Trouts. Taxonomy, Evolution, and Conservation

Polgar¹,

Iaia²,

Righi³

et al. 2022

Preprint

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During the last 150 years, the trout-culture industry focused on enhancing trout populations by stocking, in response to the growing anglers’ demand and the habitat degradation associated to the rapid urbanization and hydropower development. The industrialized north of Italy, home to the Italian Alpine and subalpine trout populations, is the source of most of the revenues of the national trout-culture industry. Its rapid growth and the massive introduction of non-native interfertile trouts eroded the genetic diversity of native lineages, leading to harsh confrontations between scientists, institutions, and sportfishing associations. We review here the state of art of the taxonomy and distribution of the northern Italian native trouts, presenting both scientific results and historical documentation. We think the only native trouts in this region are Salmo marmoratus, widespread in this region, plus small and fragmented populations of S. ghigii, present only in the Southwestern Alps. We strongly recommend the interruption of stocking of domesticated interfertile non-native trouts in this area, and recommend the adoption of Evolutionary Significant Units for salmonid fishery management. We further propose future research directions for a sustainable approach to the conservation and ecosystem management of the fishery resources and inland waters of northern Italy.

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Section: Current Risks Of Stocking Non-native S Ghigii In Northern Italymentioning

confidence: 99%

The Italian Alpine and Subalpine Trouts. Taxonomy, Evolution, and Conservation

Polgar¹,

Iaia²,

Righi³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Ice period negatively affected salmonid conditions through their negative effects on littoral invertebrate densities, which was likely to be the consequence of prolonged extreme conditions and shorter emergence period (Jacobsen & Dangles, 2017). This could restrain secondary lake productivity and thus limit resource acquisition by salmonids that rely mostly on littoral invertebrates (Eisendle et al., 2022; Proner & Mevel, 2021; Tiberti & Brighenti, 2019). Ice duration was likewise negative for deep benthic invertebrate densities which resulted in a positive indirect effect on salmonid body condition but was a minor factor compared to other effects identified with the SEM.…”

Section: Discussionmentioning

confidence: 99%

Persisting in extreme environments: What are the drivers of body conditions of introduced fish in high mountain lakes?

Vagnon,

Sentis,

Gerfand

et al. 2023

Freshwater Biology

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Salmonids are introduced in various ecosystems, including mountain lakes characterised by extreme environmental constraints. Although these constraints can affect salmonid body condition through direct and indirect pathways, they remain seldom explored despite their importance for understanding salmonid fitness and long‐term establishment. In order to fill this gap, we firstly fitted species‐specific weight–length relationships for three salmonid species in nine mountain lakes, and compared their allometric coefficients with those of 362 salmonid populations worldwide to identify potential differences in growth trajectory of salmonids in the studied lakes. We then investigated how thermal characteristics and lake morphometry could influence salmonid body conditions, both directly and indirectly through salmonid density, the presence of forage fish and resource densities. We calculated salmonid relative body condition Kn and used a structural equation model (SEM) to disentangle these direct and indirect effects. The values of allometric coefficients for the three species did not differ from those of most salmonids worldwide although ontogenetic changes in Salvelinus alpinus weight gain was observed. Kn differed significantly among the populations studied. The strongest effects were related to direct and indirect effects of lake morphometry, while thermal characteristics had mostly indirect effects on Kn. The strength and the sign of the indirect effects of morphometry and temperature were mediated by the direct effects of resource and salmonid densities on Kn. Kn estimates were greater in lakes with shallow basin slopes than those with steep slopes. Shallow basin slopes probably provide habitats that support high prey availability and require lower energy expenditure by salmonids compared to lakes with steep slopes dominated by pelagic habitats. Complementarily, higher winter and summer temperatures favour Kn by supporting higher prey densities and longer periods of feeding activity. Our results may help managers to select lakes that optimise sustainability of salmonid populations based on the joint effects of basin morphometry and the expected thermal modifications induced by global change.

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The Italian Alpine and Subalpine trouts: Taxonomy, Evolution, and Conservation

Polgar

Iaia

Righi

et al. 2022

Biology

View full text Add to dashboard Cite

During the last 150 years, the trout-culture industry focused on enhancing trout populations by stocking, in response to the growing anglers’ demand and the habitat degradation associated to the rapid urbanization and hydropower development. The industrialized north of Italy, home to the Italian Alpine and subalpine trout populations, is the source of most of the revenues of the national trout-culture industry. Its rapid growth, and the massive introduction of non-native interfertile trouts eroded the genetic diversity of native lineages, leading to harsh confrontations between scientists, institutions, and sportfishing associations. We review here the state of the art of the taxonomy and distribution of the northern Italian native trouts, presenting both scientific results and historical documentation. We think the only native trouts in this region are Salmo marmoratus, widespread in this region, plus small and fragmented populations of S. ghigii, present only in the South-western Alps. We strongly recommend the interruption of stocking of domesticated interfertile non-native trouts in this area, and recommend the adoption of Evolutionary Significant Units for salmonid fishery management. We further propose future research directions for a sustainable approach to the conservation and ecosystem management of the fishery resources and inland waters of northern Italy.

show abstract

Do alpine macroinvertebrates recover differently in lakes and rivers after alien fish eradication?

Cited by 3 publications

References 44 publications

The Italian Alpine and Subalpine Trouts. Taxonomy, Evolution, and Conservation

The Italian Alpine and Subalpine Trouts. Taxonomy, Evolution, and Conservation

Persisting in extreme environments: What are the drivers of body conditions of introduced fish in high mountain lakes?

The Italian Alpine and Subalpine trouts: Taxonomy, Evolution, and Conservation

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