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Changes in lakes after the reduction of fish densities / Teresa Buchaca (2019) 

Public Citation est un extrait de Life+ Limnopirineus : conservation of aquatic habitats and species in high mountains of the pyrenees / Empar Carrillo (2019)  Titre : Changes in lakes after the reduction of fish densities Type de document : Extrait d'ouvrage Auteurs : Teresa Buchaca ; Ibor Sabás ; Victor Osorio ; Quim Pou-Rovira ; Alexandre Miró ; Mariàngels Puig ; Eloi Cruset ; Blanca Font ; Enric Ballesteros (1958-) ; Federica Lucati ; Jongmo Suh ; Marc Ventura Année de publication : 2019 Importance : 29-40 Catégories : [CBNPMP-Thématique] Enjeux de conservation des lacs d'altitude Résumé : In this study we analyse the time series of monitoring data for the 5 years of the LimnoPirineus project. The results show that the group with the clearest response to fish eradication are the macroinvertebrates of the littoral zone, with an increase in taxon richness over time and a convergence of macroinvertebrate composition to that of natural lakes. The change in the biomass of periphytic algae is less affected and only occurs where minnow alone were present or where they were accompanied by salmonid species. In the pelagic system, lakes where minnow were the only fish species present showed an increase in the abundance of pelagic crustaceans and a decrease in phytoplankton biomass after eradication. All these changes and those of physical-chemical parameters (water transparency and nutrients) did not, however, seem to clearly affect the composition of phytoplankton or periphytic algae in the lakes studied. Lien pérenne : Handle : 10261/226771 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=152160 Buchaca, Teresa, Sabás, Ibor, Osorio, Victor, Pou-Rovira, Quim, Miró, Alexandre, Puig, Mariàngels, Cruset, Eloi, Font, Blanca, Ballesteros, Enric (1958-), Lucati, Federica, Suh, Jongmo, Ventura, Marc 2019 Changes in lakes after the reduction of fish densities. In: Life+ Limnopirineus : conservation of aquatic habitats and species in high mountains of the pyrenees. Life+ Limnopirineus, [S.l.]: 29-40.

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Consultable Chapitre (2019) URL

Fish as local stressors of Pyrenean high mountain lakes: Arrival process and impact on amphibians and other organisms / Alexandre Miró (2016) 

Public Citation Titre : Fish as local stressors of Pyrenean high mountain lakes: Arrival process and impact on amphibians and other organisms Type de document : Électronique Auteurs : Alexandre Miró Editeur : Universitat de Barcelona. Departament d'Ecologia Année de publication : 2016 Importance : 272 p. Catégories : [CBNPMP-Thématique] Amphibiens [CBNPMP-Thématique] Enjeux de conservation des lacs d'altitude [CBNPMP-Thématique] Relations et interactions individus-espèces [CBNPMP-Géographique] Pyrénées Résumé : Pyrenean high mountain lakes are naturally fishless due to natural barriers that have prevented the natural colonisation of fish species from lower streams. However, there have been numerous trout introductions to such ecosystems, both in historical and recent periods. Differing from other high mountain regions, some high mountain lakes of the Pyrenees were exploited traditionally for trout cultivation. This activity started at least centuries ago and lasted until 1950s, affecting approximately 25% of the lakes. Since 1950, and similar to other high mountain regions, a wave of modern introductions with exotic species has affected among 35% and 85% of the lakes depending on the valley. In recent decades, minnows have also been introduced, being present in 2000 in 27% of Pyrenean high mountain lakes, as a result of recreational fishing with livebait. The first part of the thesis was intended to provide an objective description of the fish introduction process in the Pyrenees. For that purpose we collected data on trout and minnow occurrence from 520 high mountain lakes >0.5 ha of the southern Pyrenees and quantified, by generalized additive models, which particular factors either environmental or anthropogenic, best explained their present distribution and as a result their lake conservation status. The distribution of Salmo trutta in the southern slope of the Pyrenees was best explained by both, anthropogenic factors and lake characteristics, while only anthropogenic factors linked to recreational fishing were associated with the distribution of the exotic trout Salvelinus fontinalis and Oncorhynchus mykiss. For the case of minnow occurrence, previous presence of trout in the lake was the most explanative variable, confirming its association with recreational fishing using them as livebait. Trout and minnow introductions can cause large ecological problems and ecosystem alterations in high mountain lakes and ponds, since both trout and minnows occupy the top of a lake’s food chain. In the second part of the thesis, we sampled 1736 Pyrenean high mountain lakes and ponds at different levels of intensity and investigated the effects of introduced fish on indicator faunal groups such as amphibians and conspicuous macroinvertebrates in the littoral, and crustaceans from the plankton. We also studied if there was a trophic cascade from fish to the littoral epilithic community of these ecosystems. Our results showed that fish presence was linked with the disappearance of most amphibian species and of most conspicuous macroinvertebrates. Minnows also showed sizeable impact on the pelagic habitat reducing the abundance of some herbivorous species of zooplankton that appeared to be unaffected by trout. In the case of amphibian species, we found that, although introduced fish had a high local impact, western-eastern patterns of some environmental variables are the main drivers of amphibian species distribution at Pyrenean range scale. In addition, we confirmed the presence of a littoral trophic cascade that define most of the characteristics of the littoral epilithon of Pyrenean high mountain lakes and ponds, through fish predation of tadpoles and hence, by a drastic reduction of grazing activity. Lien pérenne : Handle : 10803/384835 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=150934 Miró, Alexandre , 2016. Fish as local stressors of Pyrenean high mountain lakes: Arrival process and impact on amphibians and other organisms. Universitat de Barcelona. Departament d'Ecologia, [S.l.]. 272 pp.

Documents numériques

Consultable Thèse (2016) URL

High mountain lakes: extreme habitats and witnesses of environmental changes / Jordi Catalán in Limnética, 25 (1-2) (June 2006) 

Public Citation [article]  inLimnética > 25 (1-2) (June 2006) . - 35 Titre : High mountain lakes: extreme habitats and witnesses of environmental changes Type de document : Imprimé Auteurs : Jordi Catalán ; Lluis Camarero ; Marisol Felip ; Sergi Pla ; Marc Ventura ; Teresa Buchaca ; Frederic Bartumeus ; Guillermo de Mendoza ; Alexandre Miró ; Emilio O Casamayor ; Juan Manuel Medina-Sánchez ; Montserrat Bacardit ; Maddi Altuna ; Mireia Bartrons ; Daniel Díaz de Quijano Année de publication : 2006 Article en page(s) : 35 Langues : Français (fre) Catégories : [LOTERRE-Biodiversité] Changement climatique [CBNPMP-Thématique] Enjeux de conservation des lacs d'altitude [CBNPMP-Thématique] Lac d'altitude Résumé : High mountain lakes offer research opportunities beyond what could be expected from their quantitative relevance in the Earth system. In this article we present a brief summary of the research carried out in the lakes of the Pyrenees in the last twenty years by the group of limnology of the Centre for High Mountain Research (CRAM) of the University of Barcelona. The studies can be included in three main topics: life in extreme conditions, catchment-lake relationships and environmental changes. Lien pérenne : DOI : 10.23818/limn.25.38 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=147856 Catalán, Jordi, Camarero, Lluis, Felip, Marisol, Pla, Sergi, Ventura, Marc, Buchaca, Teresa, Bartumeus, Frederic, Mendoza, Guillermo de, Miró, Alexandre, Casamayor, Emilio O, Medina-Sánchez, Juan Manuel, Bacardit, Montserrat, Altuna, Maddi, Bartrons, Mireia, de Quijano, Daniel Díaz 2006 High mountain lakes: extreme habitats and witnesses of environmental changes. Limnética, 25(1-2): 35.

Documents numériques

Consultable Article (2006) URL

Introduced fish in Pyrenean high mountain lakes : impact on amphibians and other organisms, and conservation implications / Alexandre Miró in Limnética, 39 (1) (2020) 

Public Citation [article]  inLimnética > 39 (1) (2020) . - 283-297 Titre : Introduced fish in Pyrenean high mountain lakes : impact on amphibians and other organisms, and conservation implications Type de document : Imprimé Auteurs : Alexandre Miró ; Marc Ventura Année de publication : 2020 Article en page(s) : 283-297 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Enjeux de conservation des lacs d'altitude [CBNPMP-Géographique] Pyrénées Résumé : Pyrenean high mountain lakes are naturally fishless due to hydrographic barriers that have prevented the natural colonisation of fish species from lower elevation streams. However, there have been numerous introductions of trout and minnows to such ecosystems, either in historical and recent periods. Trout and minnow introductions can cause large ecological problems and ecosystem changes in high mountain lakes, since both taxa occupy the top of a lake’s food web. The study had two objectives. First, we wanted to investigate which particular anthropogenic and environmental factors best explained fish presence in the Pyrenean lakes. For that purpose we collected data on trout and minnow occurrence from 520 high mountain lakes >0.5 ha in the southern Pyrenees. The second objective was to investigate the effect of introduced fish on several groups of organisms such as amphibians, conspicuous macroinvertebrates, planktonic crustaceans and littoral epilithic community. For that purpose we sampled 1736 lakes and ponds at different levels of intensity. The distribution of Salmo trutta in the lakes of the southern slopes of the Pyrenees was best explained by both anthropogenic factors and lake characteristics, while only anthropogenic factors linked to recreational fishing were associated with the distribution of the exotic trout Salvelinus fontinalis and Oncorhynchus mykiss. In the case of minnow occurrence, previous presence of trout in the lake was the most explanative variable, confirming its association with its use as live-bait in recreational fishing. Fish presence was linked with the disappearance of most amphibian species. Despite fish had a high local effect, at Pyrenean range scale, western-eastern patterns of some environmental variables were the main drivers of amphibian species distribution. Minnows also showed a sizeable impact on the pelagic habitat, reducing the occurrence of some crustacean zooplankton species that appeared to be unaffected by trout. In addition, we confirmed the presence of a littoral trophic cascade that defines most of the characteristics of the littoral epilithon of Pyrenean high mountain lakes and ponds through fish predation of tadpoles and hence, by a drastic reduction of grazing activity. Lien pérenne : DOI : 10.23818/limn.39.19 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=150796 Miró, Alexandre, Ventura, Marc 2020 Introduced fish in Pyrenean high mountain lakes : impact on amphibians and other organisms, and conservation implications. Limnética, 39(1): 283-297.

Documents numériques

Consultable Article (2020) URL

Why should we preserve fishless high mountain lakes? / Marc Ventura (2017) 

Public Citation est un extrait de High mountain conservation in a changing world / Jordi Catalán (2017)  Titre : Why should we preserve fishless high mountain lakes? Type de document : Extrait d'ouvrage Auteurs : Marc Ventura ; Rocco Tiberti ; Teresa Buchaca ; Danilo Buñay ; Ibor Sabás ; Alexandre Miró Editeur : Springer Année de publication : 2017 Collection : Advances in global change research num. 62 Importance : 181-205 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Lac d'altitude [CBNPMP-Thématique] Enjeux de conservation des lacs d'altitude Résumé : High mountain lakes are originally fishless, although many have had introductions of non-native fish species, predominantly trout, and recently also minnows introduced by fishermen that use them as live bait. The extent of these introductions is general and substantial often involving many lakes over mountain ranges. Predation on native fauna by introduced fish involves profound ecological changes since fish occupy a higher trophic level that was previously inexistent. Fish predation produces a drastic reduction or elimination of autochthonous animal groups, such as amphibians and large macroinvertebrates in the littoral, and crustaceans in the plankton. These strong effects raise concerns for the conservation of high mountain lakes. In terms of individual species, those adapted to live in larger lakes have suffered a higher decrease in the size of their metapopulation. This ecological problem is discussed from a European perspective providing examples from two study areas: the Pyrenees and the Western Italian Alps. Species-specific studies are urgently needed to evaluate the conservation status of the more impacted species, together with conservation measures at continental and regional scales, through regulation, and at local scale, through restoration actions, aimed to stop further invasive species expansions and to restore the present situation. At different high mountain areas of the world, there have been restoration projects aiming to return lakes to their native fish-free status. In these areas autochthonous species that disappeared with the introduction of fish are progressively recovering their initial distribution when nearby fish-free lakes and ponds are available. Lien pérenne : DOI : 10.1007/978-3-319-55982-7_8 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=148572 Ventura, Marc, Tiberti, Rocco, Buchaca, Teresa, Buñay, Danilo, Sabás, Ibor, Miró, Alexandre 2017 Why should we preserve fishless high mountain lakes? In: High mountain conservation in a changing world. Springer, [S.l.]: 181-205.

Documents numériques

Consultable Chapitre 8 (2017) URL