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15 results on '"Teixeira Alves, Mickael"'

7. The Common Sunstar Crossaster papposus—A Neurotoxic Starfish

Author

Dean, Karl J., primary, Alexander, Ryan P., additional, Hatfield, Robert G., additional, Lewis, Adam M., additional, Coates, Lewis N., additional, Collin, Tom, additional, Teixeira Alves, Mickael, additional, Lee, Vanessa, additional, Daumich, Caroline, additional, Hicks, Ruth, additional, White, Peter, additional, Thomas, Krista M., additional, Ellis, Jim R., additional, and Turner, Andrew D., additional

Published
2021
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8. Application of Six Detection Methods for Analysis of Paralytic Shellfish Toxins in Shellfish from Four Regions within Latin America

Author

Turner, Andrew D., primary, Tarnovius, Sophie, additional, Hatfield, Robert G., additional, Teixeira Alves, Mickael, additional, Broadwater, Maggie, additional, Van Dolah, Frances, additional, Garcia-Mendoza, Ernesto, additional, Medina, Dinorah, additional, Salhi, Maria, additional, Goya, Alejandra B., additional, Barrera, Fernanda, additional, Carrasco, Daniel, additional, Rubilar, Ignacio, additional, and Suarez-Isla, Benjamin A., additional

Published
2020
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10. Multiple New Paralytic Shellfish Toxin Vectors in Offshore North Sea Benthos, a Deep Secret Exposed

Author

Dean, Karl J., primary, Hatfield, Robert G., additional, Lee, Vanessa, additional, Alexander, Ryan P., additional, Lewis, Adam M., additional, Maskrey, Benjamin H., additional, Teixeira Alves, Mickael, additional, Hatton, Benjamin, additional, Coates, Lewis N., additional, Capuzzo, Elisa, additional, Ellis, Jim R., additional, and Turner, Andrew D., additional

Published
2020
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11. Variability of Amnesic Shellfish Toxin and Pseudo-nitzschia occurrence in bivalve molluscs and water samples–Analysis of ten years of the official control monitoring programme

Author

Rowland-Pilgrim, Stephanie, primary, Swan, Sarah C., additional, O’Neill, Alison, additional, Johnson, Sarah, additional, Coates, Lewis, additional, Stubbs, Patrycja, additional, Dean, Karl, additional, Parks, Rachel, additional, Harrison, Keith, additional, Teixeira Alves, Mickael, additional, Walton, Alison, additional, Davidson, Keith, additional, Turner, Andrew D., additional, and Maskrey, Benjamin H., additional

Published
2019
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12. Variability and profiles of lipophilic toxins in bivalves from Great Britain during five and a half years of monitoring: azaspiracids and yessotoxins

Author

Dhanji-Rapkova, Monika, primary, O’Neill, Alison, additional, Maskrey, Benjamin H., additional, Coates, Lewis, additional, Swan, Sarah C., additional, Teixeira Alves, Mickael, additional, Kelly, Rebecca J., additional, Hatfield, Robert G., additional, Rowland-Pilgrim, Stephanie J., additional, Lewis, Adam M., additional, and Turner, Andrew D., additional

Published
2019
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13. Variability and profiles of lipophilic toxins in bivalves from Great Britain during five and a half years of monitoring: Okadaic acid, dinophysis toxins and pectenotoxins

Author

Dhanji-Rapkova, Monika, primary, O’Neill, Alison, additional, Maskrey, Benjamin H., additional, Coates, Lewis, additional, Teixeira Alves, Mickael, additional, Kelly, Rebecca J., additional, Hatfield, Robert G., additional, Rowland-Pilgrim, Stephanie J., additional, Lewis, Adam M., additional, Algoet, Myriam, additional, and Turner, Andrew D., additional

Published
2018
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14. Indirect interactions between prey : modeling and influence of the behavior of a common predator

Author

Teixeira Alves, Mickael, Biological control of artificial ecosystems (BIOCORE), Laboratoire d'océanographie de Villefranche (LOV), Observatoire océanologique de Villefranche-sur-mer (OOVM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire océanologique de Villefranche-sur-mer (OOVM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Inria Sophia Antipolis - Méditerranée (CRISAM), Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de la Recherche Agronomique (INRA), Université Nice Sophia Antipolis, Frédéric Grognard, Ludovic Mailleret, Institut National de la Recherche Agronomique (INRA)-Inria Sophia Antipolis - Méditerranée (CRISAM), Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire d'océanographie de Villefranche (LOV), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire océanologique de Villefranche-sur-mer (OOVM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire océanologique de Villefranche-sur-mer (OOVM), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDV.SA]Life Sciences [q-bio]/Agricultural sciences, Population dynamics, Apparent mutualism, [INFO.INFO-OH]Computer Science [cs]/Other [cs.OH], Comportement, Apparent competition, Modelling, Lutte biologique, Compétition apparente, Prey-predator systems, Modélisation, Biological control, Systèmes proies-prédateurs, Mutualisme apparent, Ecologie théorique, Behaviour, Theoretical ecology, Dynamiques de population
Abstract

This thesis deals with multi-prey–predators modeling. It is particularly focused on the influence of the behavior of a predator on indirect interactions between its prey, i.e, the effect of the addition of a prey on the other prey. Classical theory predicts the occurrence of negative indirect effects between prey, or apparent competition, resulting from the interaction with a common predator. More recent results identify mechanisms that mitigate these negative effects. Our work revisits the assumptions about these mechanisms in systems composed of two prey and their common predator. After setting the ecological framework by recalling the main types of direct and indirect interactions, we introduce classical predator-prey models. The work then focuses on a family of models with predator negative density-dependence coupled with different models of predator behavior when faced with different types of prey. We show that the interactions between these mechanisms can reverse apparent competition and counter-intuitively, increase prey density through their common predator. Our results are relevant to biological control programs, where a common practice aims at fostering biological control agents by providing them with alternative food or shelters. Our theory suggests that such practices may be counter-productive, pest control being disrupted by a predator distraction effect.; Cette thèse a pour objet la modélisation de systèmes multi-proies–prédateurs. Elle s’intéresse particulièrement à l’influence du comportement d’un prédateur sur les interactions indirectes entre ses proies, i.e. l’effet de l’ajout d’une proie sur la densité des autres. La théorie classique prédit l’occurrence d’effets indirects négatifs entre les proies, ou compétition apparente, résultant de l’interaction avec un prédateur commun ; des résultats plus récents identifient certains mécanismes à même d’atténuer ces effets négatifs. Nos travaux revisitent les hypothèses autour de ces mécanismes dans des systèmes composés de deux proies et de leur prédateur commun. Après avoir fixé le cadre écologique en rappelant les principaux types d’interactions directes et indirectes, nous introduisons les modèles proies-prédateurs classiques. Les travaux se concentrent ensuite sur une famille de modèles présentant de la densité-dépendance négative chez les prédateurs couplés à différentes modélisations du comportement des prédateurs lorsqu’ils sont confrontés à plusieurs types de proies. Nous montrons notamment que les interactions entre ces mécanismes peuvent inverser la compétition apparente et, contre intuitivement, accroître la densité des proies par l’intermédiaire d’un prédateur commun. Nos résultats trouvent pour partie application en lutte biologique, où il est courant de chercher à favoriser les auxiliaires en aménageant leur environnement (apport de nourriture alternative, refuge, ...). Ils suggèrent que de telles pratiques peuvent se révéler contre-productives, le contrôle des ravageurs pouvant être affaibli du fait d’une distraction de leurs prédateurs.

Published
2013

15. Optimal foraging predators in Leslie Gower models with alternative prey

Author

Teixeira-Alves, Mickael, Mailleret, Ludovic, Grognard, Frédéric, Unité Recherches Intégrées en Horticulture (URIH), Institut National de la Recherche Agronomique (INRA), Biological control of artificial ecosystems (BIOCORE), Institut National de la Recherche Agronomique (INRA)-Inria Sophia Antipolis - Méditerranée (CRISAM), Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire d'océanographie de Villefranche (LOV), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire océanologique de Villefranche-sur-mer (OOVM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire océanologique de Villefranche-sur-mer (OOVM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Gouzé, Jean-Luc, Laboratoire d'océanographie de Villefranche (LOV), Observatoire océanologique de Villefranche-sur-mer (OOVM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire océanologique de Villefranche-sur-mer (OOVM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Inria Sophia Antipolis - Méditerranée (CRISAM), and Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de la Recherche Agronomique (INRA)

Subjects
[SDV] Life Sciences [q-bio], [SPI]Engineering Sciences [physics], [MATH.MATH-GM]Mathematics [math]/General Mathematics [math.GM], [SPI] Engineering Sciences [physics], [INFO.INFO-AU]Computer Science [cs]/Automatic Control Engineering, [SDV]Life Sciences [q-bio], [MATH.MATH-GM] Mathematics [math]/General Mathematics [math.GM], [INFO.INFO-AU] Computer Science [cs]/Automatic Control Engineering
Abstract

International audience; Optimal foraging theory defines the diet choice of a predator by imposing that it chooses the prey that is instantaneously the most beneficial for him [1]. It has been shown that this phenomenon leads to a switching diet and to the persistence of both prey and predators in generalized Lokta-Volterra models [2, 3]. This framework can be useful to study the influence of an introduced alternative prey on a one-prey-one-predator system. In a Lokta-Volterra model, this introduction can enhance predator growth and have negative effects on the main prey, which is called apparent competition [4]. In this work, we focus on a Leslie-Gower model with two dynamic prey, where the preyed population determines the carrying capacity of the predator population. Optimal foraging aiming at the maximization of the per capita growth rate of the predator population then leads to the maximization of its instantaneous carrying capacity. This optimization defines two main regions in the population state space, separated by a dividing plane, and thus three diet strategies. The predator population will have the choice between eating only the main prey, or only the alternative prey, or following a mixed diet. In each of these three regions, the dynamics which are relevant to the predator reduce to a Leslie-Gower model with a stable positive equilibrium. Depending on the parameters of the system, different global behaviors arise. However, in all cases, there is only a single positive stable equilibrium, which can potentially lie on the dividing plane; the equilibrium is such that its predator population is larger or equal than that in the absence of the alternative prey. Also, the presence of an alternative prey is never detrimental to the main prey; so the apparent competition does not hold.

Published
2011

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