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5. Invasion Dynamics of a Fish-Free Landscape by Brown Trout (Salmo trutta)

Author

Labonne, Jacques, Vignon, Matthias, Prévost, Etienne, Lecomte, Frédéric, Dodson, Julian, Kaeuffer, Renaud, Aymes, Jean-Christophe, Jarry, Marc, Gaudin, Philippe, Davaine, Patrick, Beall, Edward, de Leaniz, Carlos Garcia, Ecologie Comportementale et Biologie des Populations de Poissons (ECOBIOP), Institut National de la Recherche Agronomique (INRA)-Université de Pau et des Pays de l'Adour (UPPA), Ministère des Ressources naturelles du Québec, Université Laval, Redpath Museum and Department of Biology, Université McGill, Université Laval [Québec] (ULaval), and McGill University = Université McGill [Montréal, Canada]

Subjects
0106 biological sciences, Time Factors, Trout, Biodiversité et Ecologie, [SDV]Life Sciences [q-bio], Population Dynamics, Population Modeling, lcsh:Medicine, habitat, Fresh Water, salmo trutta, 01 natural sciences, Freshwater ecosystem, Brown trout, poisson, métapopulation, Spatial and Landscape Ecology, Colonization, Salmo, lcsh:Science, ComputingMilieux_MISCELLANEOUS, Freshwater Ecology, salmonidae, [SDV.EE]Life Sciences [q-bio]/Ecology, environment, Multidisciplinary, Ecology, Animal Behavior, biology, [SDV.BA]Life Sciences [q-bio]/Animal biology, Fishes, Freshwater fish, invasion biologique, iles kerguelen, Research Article, Freshwater Environments, Environmental Monitoring, Metapopulation Dynamics, colonisation, Antarctic Regions, Metapopulation, [SDV.BID]Life Sciences [q-bio]/Biodiversity, 010603 evolutionary biology, Biodiversity and Ecology, Rivers, Animals, 14. Life underwater, Biology, Ecosystem, Probability, Evolutionary Biology, Stochastic Processes, Population Biology, 010604 marine biology & hydrobiology, Propagule pressure, lcsh:R, Aquatic Environments, Bayes Theorem, Models, Theoretical, 15. Life on land, biology.organism_classification, modèle bayésien, Evolutionary Ecology, 13. Climate action, Biological dispersal, lcsh:Q, Population Ecology, Introduced Species, Ecological Environments
Abstract

International audience; Metapopulation dynamics over the course of an invasion are usually difficult to grasp because they require large and reliable data collection, often unavailable. The invasion of the fish-free freshwater ecosystems of the remote sub-Antarctic Kerguelen Islands following man-made introductions of brown trout (Salmo trutta) in the 1950's is an exception to this rule. Benefiting from a full long term environmental research monitoring of the invasion, we built a Bayesian dynamic metapopulation model to analyze the invasion dynamics of 85 river systems over 51 years. The model accounted for patch size (river length and connections to lakes), alternative dispersal pathways between rivers, temporal trends in dynamics, and uncertainty in colonization date. The results show that the model correctly represents the observed pattern of invasion, especially if we assume a coastal dispersal pathway between patches. Landscape attributes such as patch size influenced the colonization function, but had no effect on propagule pressure. Independently from patch size and distance between patches, propagule pressure and colonization function were not constant through time. Propagule pressure increased over the course of colonization, whereas the colonization function decreased, conditional on propagule pressure. The resulting pattern of this antagonistic interplay is an initial rapid invasion phase followed by a strong decrease in the invasion rate. These temporal trends may be due to either adaptive processes or environmental gradients encountered along the colonization front. It was not possible to distinguish these two hypotheses. Because invasibility of Kerguelen Is. freshwater ecosystems is very high due to the lack of a pre-existing fish fauna and minimal human interference, our estimates of invasion dynamics represent a blueprint for the potential of brown trout invasiveness in pristine environments. Our conclusions shed light on the future of polar regions where, because of climate change, fish-free ecosystems become increasingly accessible to invasion by fish species

Published
2013

6. Sea trout (<italic>Salmo trutta</italic>) growth patterns during early steps of invasion in the Kerguelen Islands.

Author

Jarry, Marc, Beall, Edward, Davaine, Patrick, Guéraud, François, Gaudin, Philippe, Aymes, Jean-Christophe, Labonne, Jacques, and Vignon, Matthias

Subjects
HABITATS, PREDATION, BIOLOGICAL invasions, BROWN trout, ECOSYSTEMS
Abstract

Brown trout (Salmo trutta L.) was voluntarily introduced in some rivers of the Kerguelen Islands in the 1950s-1960s. Fish originating from hatcheries rapidly colonized other streams, thanks to the early occurrence of anadromous (i.e., migratory) form. Getting insight into the success of colonization requires investigating fitness-related traits such as growth and reproductive investment. In particular, increased growth and body size—traits that are broadly related to dispersal ability—are predicted on colonization front, to the possible detriment of reproductive ability. We here report such investigation on early data following the first natural reproductions in the founder populations of Kerguelen, from 1971 to 1994, assessing the main characteristic on growth at sea and reproductive investment for both sexes. Our results reveal that growth of sea trout is excellent with individuals fully benefiting from their relatively short period of growth at sea, sizes and weights ranking among the highest recorded to date. During the reproduction period, males lose on average 15-21% of their weight, whereas females lose 18-19% of their weight. Although a trade-off between growth and reproduction may arise at marginal distribution of invasive species, our study indicates that any potential advantages arising from increased growth and therefore potential dispersal ability may not be directly balanced by reduced reproductive investment, with respect to other published studies. Results overall shed light on intrinsic invasiveness of the brown trout in a post-glacial landscape with barely any interaction with human activities. [ABSTRACT FROM AUTHOR]

Published
2018
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7. FRESHWATER FISHING IN SEABIRDS FROM THE SUB-ANTARCTIC KERGUELEN ISLANDS

Author

Cook, Timothée R., Davaine, Patrick, and Lacalle, Martine

Subjects
[SDE.BE] Environmental Sciences/Biodiversity and Ecology, Kerguelen Islands, Gentoo Penguin, Pygoscelis papua, [SDE.ES] Environmental Sciences/Environmental and Society, Phalacrocorax verrucosus, Salmonidae, Kerguelen Shag
Abstract

Salmonid fish were introduced into the freshwater ecosystems of the sub-Antarctic Kerguelen Islands between 1955 and 1992. Before that period, those ecosystems were free of freshwater fish. Because of the absence of competition and other factors, the various populations of salmonid fish increased exponentially soon after their first successful introductions. Field workers have been monitoring the populations of salmonids over a period of 40 years. Here, we present a summary of observations by those field workers of seabirds foraging on freshwater fish. Observations show that several seabird species benefit from the fish. However, although the density of fish is extremely high, the numbers of seabirds actually exploiting them remains low. Simple calculations show that seabirds probably do not affect freshwater fish demography significantly. The discrepancy between the numbers of seabirds freshwater fishing and the numbers of fish present could result from difficulty of access for seabirds to this potential resource.

Published
2009

9. Genetic variation among brown trout migratory and resident phenotypes in the recent colonized hydrographic system of Kerguelen islands

Author

Guyomard, René, Davaine, Patrick, Charles, Katia, Unité de recherche Génétique des Poissons (UGP), Institut National de la Recherche Agronomique (INRA), Ecologie Comportementale et Biologie des Populations de Poissons (ECOBIOP), Institut National de la Recherche Agronomique (INRA)-Université de Pau et des Pays de l'Adour (UPPA), Écologie et santé des écosystèmes (ESE), Institut National de la Recherche Agronomique (INRA)-AGROCAMPUS OUEST, and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)

Subjects
MARQUEUR MICROSATELLITE, sea trout, ECOTYPE RESIDENT, terres australes et antarctiques françaises, kerguelen, ACCLIMATATION, [SDV]Life Sciences [q-bio], truite commune, ECOTYPE MIGRATEUR, DIFFERENTIATION GENETIQUE, tom, salmo trutta, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2005

10. Colonization potential of a coastal region by migratory brown trout (Salmo trutta L.) : the case of the Kerguelen islands (TAAF). 1. Colonization dynamics and environmental conditions

Author

Davaine, Patrick, Beall, Edward, Ecologie Comportementale et Biologie des Populations de Poissons (ECOBIOP), and Institut National de la Recherche Agronomique (INRA)-Université de Pau et des Pays de l'Adour (UPPA)

Subjects
MIGRATORY BEHAVIOUR, BROWN TROUT, INTRODUCTION D'ESPECE, SALMO TRUTTA, [SDV]Life Sciences [q-bio], ENVIRONMENTAL FACTOR, COLONIZATION
Published
2005

11. Colonization potential of a coastal region by migratory brown trout (Salmo trutta L): the case of the Kerguelen Islands (TAAF). II. Genetic stucture of the populations after a dispersion and colonization phase

Author

Launey, Sophie, Davaine, Patrick, Guyomard, René, Brunet, Gaëtan, Écologie et santé des écosystèmes (ESE), Institut National de la Recherche Agronomique (INRA)-AGROCAMPUS OUEST, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Chercheur indépendant, Génétique Animale et Biologie Intégrative (GABI), Institut National de la Recherche Agronomique (INRA)-AgroParisTech, and AgroParisTech-Institut National de la Recherche Agronomique (INRA)

Subjects
sea trout, genêtic differentiation, microsatellite, animal diseases, colonisation, [SDV]Life Sciences [q-bio], education, migration, salmo trutta, différenciation génétique, digestive system diseases, health care economics and organizations, microsatellites
Abstract

Colonization potential of a coastal region by migratory brown trout (Salmo trutta L): the case of the Kerguelen Islands (TAAF). II. Genetic stucture of the populations after a dispersion and colonization phase.. International Symposium of Fish and Diadromy in Europe : Ecology

Published
2005

12. Poissons des îles Kerguelen et Crozet. Guide régional de l'océan austral

Author

Duhamel, Guy, Gasco, Nicolas, Davaine, Patrick, Muséum national d'Histoire naturelle (MNHN), Ecologie Comportementale et Biologie des Populations de Poissons (ECOBIOP), and Institut National de la Recherche Agronomique (INRA)-Université de Pau et des Pays de l'Adour (UPPA)

Subjects
[SDV]Life Sciences [q-bio]
Abstract

Collection Patrimoines Naturels. n.63; National audience

Published
2005

13. Etude de l'impact de la fragmentation naturelle ou anthropique du milieu sur la diversité des peuplements de truite fario de la Nive. Convention d'étude no. 00-686 entre le Conseil Supérieur de la Pêche et l'INRA. Code INRA : B 3127. Rapport final

Author

Héland, Michel, Parade, Michel, Garcia-Vasquez, E., Beall, Edward, Davaine, Patrick, Jarry, M., Ecologie Comportementale et Biologie des Populations de Poissons (ECOBIOP), and Institut National de la Recherche Agronomique (INRA)-Université de Pau et des Pays de l'Adour (UPPA)

Subjects
[SDV]Life Sciences [q-bio], ETUDE DES POPULATIONS, GENETIQUE DES POPULATIONS
Abstract

* INRA UMR ECOBIOP, quartier Ibarron, Saint Pée sur Nivelle (FRA) Diffusion du document : INRA UMR ECOBIOP, quartier Ibarron, Saint Pée sur Nivelle (FRA)

Published
2004

14. L'habitat des cours d'eau à salmonidés

Author

Haury, J., Davaine, Patrick, Ecobiologie et qualité des hydrosystèmes continentaux (EQHC), Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Supérieure Agronomique de Rennes, Station d'hydrobiologie, Institut National de la Recherche Agronomique (INRA), A. Neveu (Editeur), C. Riou (Editeur), R. Bonhomme (Editeur), P. Chassin (Editeur), F. Papy (Editeur), and ProdInra, Migration

Subjects
[SDV] Life Sciences [q-bio], [SDV]Life Sciences [q-bio], ComputingMilieux_MISCELLANEOUS, ECOLOGIE
Abstract

National audience

Published
2001

15. Structure des populations de truite de mer (Salmo trutta L.) du bassin de l'Adour par analyse biometrique des ecailles. Rapport final du contrat no. 272/2000 entre l'Institution Interdepartementale pour l'Amenagement Hydraulique du Bassin de l'Adour et l'Association pour le Developpement de l'Enseignement et des Recherches aupres des Universites, des Centres de Recherches et des Entreprises d'Aquitaine

Author

Lecuna, S., Davaine, Patrick, Jarry, M., Station d'hydrobiologie, Institut National de la Recherche Agronomique (INRA), and ProdInra, Migration

Subjects
[SDV] Life Sciences [q-bio], [SDV]Life Sciences [q-bio]
Abstract

*INRA Station d'Hydrobiologie, Ecologie des Poissons, Saint Pee sur Nivelle (FRA) Diffusion du document : INRA Station d'Hydrobiologie, Ecologie des Poissons, Saint Pee sur Nivelle (FRA); National audience

Published
2000

16. Formation à la statistique. FPSTAT2. Analyse multidimensionnelle des données

Author

Carlier, AURELIEN, Membré, Jeanne Marie, Badia, Jacques, Bruchou, Claude, Davaine, Patrick, Dessaint, Fabrice, Ghesquière, Marc, Laurens, F., Mazerolles, Gérard, Pichot, Christian, Wavresky, Pierre, Alègre, C., Département de Biométrie et d'Intelligence Artificielle, ., Service de la Formation Permanente, ., ProdInra, Migration, Laboratoire de Génie des Procédés et Technologie Alimentaires (LGPTA), Institut National de la Recherche Agronomique (INRA), Unité de Biométrie et Intelligence Artificielle (UBIA), Biostatistique et Processus Spatiaux (BioSP), Station d'hydrobiologie, Biologie et Gestion des Adventices (BGA), Université de Bourgogne (UB)-Institut National de la Recherche Agronomique (INRA)-Etablissement National d'Enseignement Supérieur Agronomique de Dijon (ENESAD), Unité de recherche Génétique et Amélioration des Plantes Fourragères (UGAPF), Unité mixte de recherche génétique et horticulture Genhort, Institut National d'Horticulture-Institut National de la Recherche Agronomique (INRA)-Université d'Angers (UA), Station de recherches en technologie et analyses laitières (SRTAL), Unité de Recherches Forestières Méditerranéennes (URFM), UMR INRA / ENESAD : Economie et Sociologie Rurales (UM DIJON INRA/ENESAD), and Etablissement National d'Enseignement Supérieur Agronomique de Dijon (ENESAD)-Institut National de la Recherche Agronomique (INRA)

Subjects
[SDV] Life Sciences [q-bio], [SDE] Environmental Sciences, ANALYSE DES CORRESPONDANCES MULTIPLES, [SPI.GPROC] Engineering Sciences [physics]/Chemical and Process Engineering, [SDV]Life Sciences [q-bio], [SDV.IDA]Life Sciences [q-bio]/Food engineering, [SDE]Environmental Sciences, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, ANALYSE FACTORIELLE DES CORRESPONDANCES, [SDV.IDA] Life Sciences [q-bio]/Food engineering
Abstract

* INRA Département de biométrie, Domaine de Vilvert, 78350 Jouy en Josas cedex Diffusion du document : INRA Département de biométrie, Domaine de Vilvert, 78350 Jouy en Josas cedex; National audience

Published
1999

21. Modélisation stochastique du cycle biologique du saumon atlantique (Salmo salar L.) : bases biologiques, implementation informatique et interprétation

Author

Dumas, J., Faivre, Robert, Charron, M.H., Badia, Jacques, Davaine, Patrick, Prouzet, P., Ferraris, Jocelyne (ed.), Pelletier, D. (ed.), Rochet, M.J. (ed.), Station d'hydrobiologie, Institut National de la Recherche Agronomique (INRA), and Unité de Biométrie et Intelligence Artificielle (UBIA)

Subjects
MODELE STOCHASTIQUE, FACTEUR ABIOTIQUE, INFORMATIQUE, [SDV]Life Sciences [q-bio], MODELISATION STOCHASTIQUE, CYCLE DE DEVELOPPEMENT, MODELISATION, ComputingMilieux_MISCELLANEOUS, FACTEUR ANTHROPIQUE, POISSON
Abstract

National audience

Published
1996

24. La vie marine du saumon atlantique dans son aire geographique

Author

Davaine, Patrick, Prouzet, P., Station d'hydrobiologie, Institut National de la Recherche Agronomique (INRA), J.C. Gueguen, P. Prouzet, and ProdInra, Migration

Subjects
[SDV] Life Sciences [q-bio], [SDV]Life Sciences [q-bio], ComputingMilieux_MISCELLANEOUS
Abstract

National audience

Published
1994

27. Détermination d'un modèle de rétrocalcul pour l'estimation de la croissance de la truite de mer (Salmo trutta) à Kerguelen

Author

Beall, Edward, Davaine, Patrick, Bazin, Didier, BLANC, J.M., Baglinière, J.L. (ed.), Castanet, J. (ed.), Conand, François (ed.), Meunier, F.J. (ed.), Station d'hydrobiologie, and Institut National de la Recherche Agronomique (INRA)

Subjects
POISSON MARIN, MODELE MATHEMATIQUE, ISOMETRIE, [SDV]Life Sciences [q-bio], MODELE DE RETROCALCUL, ALLOMETRIE, TRUITE DE MER, SCALIMETRIE, ComputingMilieux_MISCELLANEOUS, SALMONIDE
Abstract

L'utilisation du rétrocalcul des tailles chez les poissons à partir des mensurations des écailles demande le respect de certaines conditions, tant au niveau de l'échantillonnage des individus étudiés et des zones de prélèvement des écailles, que de l'ajustement du modèle décrivant la longueur du corps-rayon de l'écaille, et de la méthode de rétromesure. Nous présentons ici un exemple pour une population de truite de mer des îles Kerguelen, TAAF. (Résumé d'auteur)

Published
1992

30. Invasion Dynamics of a Fish-Free Landscape by Brown Trout (Salmo trutta).

Author

Labonne, Jacques, Vignon, Matthias, Prévost, Etienne, Lecomte, Frédéric, Dodson, Julian J., Kaeuffer, Renaud, Aymes, Jean-Christophe, Jarry, Marc, Gaudin, Philippe, Davaine, Patrick, and Beall, Edward

Subjects
BROWN trout, METAPOPULATION (Ecology), BIOLOGICAL invasions, ACQUISITION of data, BIOLOGICAL evolution, FRESHWATER ecology
Abstract

Metapopulation dynamics over the course of an invasion are usually difficult to grasp because they require large and reliable data collection, often unavailable. The invasion of the fish-free freshwater ecosystems of the remote sub-Antarctic Kerguelen Islands following man-made introductions of brown trout (Salmo trutta) in the 1950's is an exception to this rule. Benefiting from a full long term environmental research monitoring of the invasion, we built a Bayesian dynamic metapopulation model to analyze the invasion dynamics of 85 river systems over 51 years. The model accounted for patch size (river length and connections to lakes), alternative dispersal pathways between rivers, temporal trends in dynamics, and uncertainty in colonization date. The results show that the model correctly represents the observed pattern of invasion, especially if we assume a coastal dispersal pathway between patches. Landscape attributes such as patch size influenced the colonization function, but had no effect on propagule pressure. Independently from patch size and distance between patches, propagule pressure and colonization function were not constant through time. Propagule pressure increased over the course of colonization, whereas the colonization function decreased, conditional on propagule pressure. The resulting pattern of this antagonistic interplay is an initial rapid invasion phase followed by a strong decrease in the invasion rate. These temporal trends may be due to either adaptive processes or environmental gradients encountered along the colonization front. It was not possible to distinguish these two hypotheses. Because invasibility of Kerguelen Is. freshwater ecosystems is very high due to the lack of a pre-existing fish fauna and minimal human interference, our estimates of invasion dynamics represent a blueprint for the potential of brown trout invasiveness in pristine environments. Our conclusions shed light on the future of polar regions where, because of climate change, fish-free ecosystems become increasingly accessible to invasion by fish species. [ABSTRACT FROM AUTHOR]

Published
2013
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31. Analyse scalimétrique de la truite de mer (Salmo truttaL.) : formation des anneaux et critères d'identification chez les individus sédentaires et migrateurs d'une même population acclimatée aux îles Kerguelen (TAAF)

Author

Beall, Edward and Davaine, Patrick

Abstract

Analyse des écailles de truites acclimatées aux îles Kerguelen, archipel du domaine subantarctique, a permis de démontrer la périodicité annuelle des anneaux par différentes méthodes donnant des résultats convergents (analyse des fréquences de longueur, marquage-recapture, chronologie de l'apparition des anneaux sur la marge des écailles). Après un long arrêt de croissance hivernal, l'anneau apparaît sur la marge de l'écaille en octobre-novembre, lors de la reprise de croissance. Les critères objectifs d'identification de l'anneau sont identiques pour les truites de mer et pour les truites non migratrices; ils mettent en évidence un arrêt complet de croissance plutôt qu'un changement de rythme correspondant à un ralentissement de cette dernière. Les basses températures hivernales (5 mois à moins de 3 °C) alliées à une faible disponibilité de faune endogène expliquent l'arrêt de croissance. Malgré les faibles variations saisonnières des facteurs environnementaux (températures moyennes estivales ne dépassant pas 10 °C en eau douce et 7 °C en mer), on constate une grande variabilité de la croissance scalaire entre individus. En conclusion, les écailles peuvent être utilisées pour les études démographiques, sous réserve de validation des déterminations à tous les âges.

Published
1988
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35. Kerguelen. Hydrobiologie

Author

Davaine, Patrick, Station d'hydrobiologie, Institut National de la Recherche Agronomique (INRA), J.C. Duchene, and ProdInra, Migration

Subjects
[SDV] Life Sciences [q-bio], [SDV]Life Sciences [q-bio], ComputingMilieux_MISCELLANEOUS, SALMONIDE
Abstract

National audience

Published
1989

38. Especes de salmonides introduites. Perspectives economiques

Author

Davaine, Patrick, Station d'hydrobiologie, Institut National de la Recherche Agronomique (INRA), and ProdInra, Migration

Subjects
[SDV] Life Sciences [q-bio], INTRODUCTION D'ESPECE, [SDV]Life Sciences [q-bio], OMBLE DE FONTAINE, ESPECE MIGRATRICE, ComputingMilieux_MISCELLANEOUS, SALMONIDE
Abstract

National audience

Published
1987

40. Les eaux douces subantarctiques

Author

Davaine, Patrick, Laboratoire d'écologie des poissons et d'aménagement des pêches, Institut National de la Recherche Agronomique (INRA), R. Lesel (Coordinateur), A.F.L., Association francaise de limnologie - Paris (FRA), and ProdInra, Migration

Subjects
[SDV] Life Sciences [q-bio], INTRODUCTION D'ESPECE, [SDV]Life Sciences [q-bio], ECOLOGIE
Published
1983

42. La truite de mer Salmo trutta L. 1758. Bibliographie

Author

Davaine, Patrick, Beall, Edward, Station d'hydrobiologie, and Institut National de la Recherche Agronomique (INRA)

Subjects
[SDV]Life Sciences [q-bio]
Abstract

627 ref.; National audience

Published
1982

43. Invasion Dynamics of a Fish-Free Landscape by Brown Trout (Salmo trutta).

Author

Labonne, Jacques, Vignon, Matthias, Prévost, Etienne, Lecomte, Frédéric, Dodson, Julian J., Kaeuffer, Renaud, Aymes, Jean-Christophe, Jarry, Marc, Gaudin, Philippe, Davaine, Patrick, and Beall, Edward

Subjects
*BROWN trout, *METAPOPULATION (Ecology), *BIOLOGICAL invasions, *ACQUISITION of data, *BIOLOGICAL evolution, *FRESHWATER ecology
Abstract

Metapopulation dynamics over the course of an invasion are usually difficult to grasp because they require large and reliable data collection, often unavailable. The invasion of the fish-free freshwater ecosystems of the remote sub-Antarctic Kerguelen Islands following man-made introductions of brown trout (Salmo trutta) in the 1950's is an exception to this rule. Benefiting from a full long term environmental research monitoring of the invasion, we built a Bayesian dynamic metapopulation model to analyze the invasion dynamics of 85 river systems over 51 years. The model accounted for patch size (river length and connections to lakes), alternative dispersal pathways between rivers, temporal trends in dynamics, and uncertainty in colonization date. The results show that the model correctly represents the observed pattern of invasion, especially if we assume a coastal dispersal pathway between patches. Landscape attributes such as patch size influenced the colonization function, but had no effect on propagule pressure. Independently from patch size and distance between patches, propagule pressure and colonization function were not constant through time. Propagule pressure increased over the course of colonization, whereas the colonization function decreased, conditional on propagule pressure. The resulting pattern of this antagonistic interplay is an initial rapid invasion phase followed by a strong decrease in the invasion rate. These temporal trends may be due to either adaptive processes or environmental gradients encountered along the colonization front. It was not possible to distinguish these two hypotheses. Because invasibility of Kerguelen Is. freshwater ecosystems is very high due to the lack of a pre-existing fish fauna and minimal human interference, our estimates of invasion dynamics represent a blueprint for the potential of brown trout invasiveness in pristine environments. Our conclusions shed light on the future of polar regions where, because of climate change, fish-free ecosystems become increasingly accessible to invasion by fish species. [ABSTRACT FROM AUTHOR]

Published
2013
Full Text
View/download PDF

44. Invasion dynamics of a fish-free landscape by brown trout (Salmo trutta).

Author

Labonne J, Vignon M, Prévost E, Lecomte F, Dodson JJ, Kaeuffer R, Aymes JC, Jarry M, Gaudin P, Davaine P, and Beall E

Subjects
Animals, Antarctic Regions, Bayes Theorem, Ecology, Ecosystem, Environmental Monitoring methods, Fishes, Fresh Water, Models, Theoretical, Population Dynamics, Probability, Rivers, Stochastic Processes, Time Factors, Introduced Species, Trout physiology
Abstract

Metapopulation dynamics over the course of an invasion are usually difficult to grasp because they require large and reliable data collection, often unavailable. The invasion of the fish-free freshwater ecosystems of the remote sub-Antarctic Kerguelen Islands following man-made introductions of brown trout (Salmo trutta) in the 1950's is an exception to this rule. Benefiting from a full long term environmental research monitoring of the invasion, we built a Bayesian dynamic metapopulation model to analyze the invasion dynamics of 85 river systems over 51 years. The model accounted for patch size (river length and connections to lakes), alternative dispersal pathways between rivers, temporal trends in dynamics, and uncertainty in colonization date. The results show that the model correctly represents the observed pattern of invasion, especially if we assume a coastal dispersal pathway between patches. Landscape attributes such as patch size influenced the colonization function, but had no effect on propagule pressure. Independently from patch size and distance between patches, propagule pressure and colonization function were not constant through time. Propagule pressure increased over the course of colonization, whereas the colonization function decreased, conditional on propagule pressure. The resulting pattern of this antagonistic interplay is an initial rapid invasion phase followed by a strong decrease in the invasion rate. These temporal trends may be due to either adaptive processes or environmental gradients encountered along the colonization front. It was not possible to distinguish these two hypotheses. Because invasibility of Kerguelen Is. freshwater ecosystems is very high due to the lack of a pre-existing fish fauna and minimal human interference, our estimates of invasion dynamics represent a blueprint for the potential of brown trout invasiveness in pristine environments. Our conclusions shed light on the future of polar regions where, because of climate change, fish-free ecosystems become increasingly accessible to invasion by fish species.

Published
2013
Full Text
View/download PDF

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