35 results on '"Minto, Coilin"'
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2. Survivorship of discarded cuckoo ray in bottom trawl fisheries in the northern Bay of Biscay, Southern Celtic and Irish Seas
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Baulier, Loïc, McHugh, Matthew, Minto, Cóilín, Morandeau, Fabien, Murphy, Shane, Sourget, Quiterie, Oliver, Martin, and Morfin, Marie
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- 2024
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Catalog
3. Standardising long-term eel (Anguilla anguilla) fyke net survey data reveals covariate effects and improves estimates of declining relative abundance
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Poole, Russell, Minto, Cóilín, Cooney, Joseph, Drumm, Alan, Hughes, Pat, Murphy, Michael, Nixon, Pat, Rogan, Ger, Sweeney, David, and O’Leary, Ciara
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- 2024
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4. Assessment of cod survival in the Irish fly-shoot seine fishery using survivorship pop-up satellite archival tags
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Oliver, Martin, O’Neill, Ross, McHugh, Matthew, Browne, Daragh, Murphy, Shane, Minto, Cóilín, and Cosgrove, Ronán
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- 2023
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5. Numbers or mass? Comparison of two theoretically different stage-based stock assessment models and their ability to model simulated and real-life stocks
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Batts, Luke, Minto, Coilin, Gerritsen, Hans, and Brophy, Deirdre
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Stock assessment (Wildlife management) -- Methods ,Fish populations -- Models ,Earth sciences - Abstract
Stage-based assessment models are a type of fisheries stock assessment model that offer an alternative middle ground between aggregate and compositional models. We compare the capabilities of two theoretically different stage-based assessment approaches: an implementation of a biomass-based delay-difference model first described in a theoretical paper by Schnute in 1987, and an implementation of the well-known numbers-based two-stage model Catch-Survey Analysis (CSA). Models were tested within a simulation framework as well as on the real stock of white-bellied anglerfish (Lophius piscatorius) in the Celtic Seas and Northern Bay of Biscay. For the simulated stocks, estimates from the biomass-based two-stage models were close to the true values in certain scenarios, but were sensitive to selectivity assumptions and configuration of growth within the model. CSA was more robust to selectivity assumptions, performing well in all simulated stock scenarios. Overall, results indicated that CSA was a robust stock assessment model but with relatively low precision, whereas the Schnute model was precise but required growth and mean fish weight data unaffected by selectivity. Les modeles d'evaluation reposant sur l'etape constituent un type de modeles d'evaluation des stocks de peche qui offre une approche a mi-chemin entre les modeles globaux et les modeles compositionnels. Nous comparons les capacites de deux approches theoriquement differentes d'evaluation reposant sur l'etape, dont une application d'un modele de difference des decalages base sur la biomasse, decrit initialement dans un article theorique par Schnute dans 1987, et une application du modele bien connu a deux etapes base sur les denombrements, Catch-Survey Analysis (CSA). Les modeles ont ete testes au sein d'un cadre de simulation ainsi que sur le stock reel de baudroies communes (Lophius piscatorius) dans les mers Celtes et le nord du golfe de Gascogne. Pour les stocks simules, les estimations des modeles a deux etapes bases sur la biomasse sont proches des valeurs reelles dans certains scenarios, mais sont sensibles a des hypotheses concernant la selectivite et a la configuration de la croissance dans le modele. CSA est plus robuste par rapport aux hypotheses sur la selectivite, donnant de bons resultats dans tous les scenarios de stock simule. Globalement, les resultats indiquent que CSA est un modele d'evaluation des stocks robuste, mais d'une precision relativement faible, alors que le modele de Schnute est precis, mais requiert des donnees sur la croissance et le poids moyen des poissons qui ne sont pas influencees par la selectivite. [Traduit par la Redaction], 1. Introduction Fisheries stock assessments are an important tool for fisheries management (Hilborn and Walters 1992; Dichmont et al. 2016). Using a variety of data sources, stock assessments determine the [...] more...
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- 2022
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6. Detecting population regulation of winter flounder from noisy data
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Langan, Joseph A., Collie, Jeremy S., and Minto, Coilin
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Narragansett Bay -- Natural history ,Fish populations -- Thinning -- Observations ,Company growth ,Company distribution practices ,Earth sciences - Abstract
Year-class size of marine fish is thought to be determined during the first year of life, with density-dependent mortality occuring during the larval or juvenile stages. However, investigations of such dynamics are often limited by data availability. To test this paradigm for winter flounder (Pseudopleuronectes americanus) in Narragansett Bay, Rhode Island, the abundances of 29 year classes moving through seven life stages were analyzed with a novel extension of key-factor analysis. Evidence of density dependence was identified between the egg and July young-of-the-year stages and high process-error variance was detected throughout the life cycle, suggesting year-class size is not fully determined until age-2. However, the first summer appeared to be a critical life stage for winter flounder, during which high temperatures, hypoxia, and predator abundance contributed to increased mortality rates behind a long-term population decline. Due to its general data requirements, the key-factor analysis method developed here may be applied to other aquatic populations to identify the impacts of external stressors at particular life stages and the degree to which they are compensated by density-dependent processes. L'effectif des classes d'age de poissons marins serait determine durant la premiere annee de vie, tandis que la mortalite densite-dependante a lieu durant les stades larvaire et juvenile. Toutefois, les etudes sur ce type de dynamique sont limitees par la disponibilite de donnees. Pour verifier ce paradigme pour la plie rouge (Pseudopleuronectes americanus) dans la baie de Narragansett (Rhode Island, Etats-Unis), nous avons analyse l'abondance de 29 classes d'age au fil de sept etapes du cycle biologique a l'aide d'une nouvelle extension d'analyse par facteurs cles. Des indices de densite-dependance sont releves entre les stades oeuf et jeune de l'annee en juillet, et une forte variance de l'erreur de traitement durant tout le cycle biologique est decelee, donnant a penser que l'effectif de la classe d'age n'est pas entierement etabli avant 2 ans. Toutfois, le premier ete semble etre une etape critique du cycle biologique pour la plie rouge, durant laquelle des temperatures elevees, l'hypoxie et l'abondance des predateurs contribuent a accroitre les taux de mortalite a l'origine d'un long declin demographique. En raison de ses exigences generales en matiere de donnees, la methode d'analyse par facteurs cles presentee pourrait etre appliquee a d'autres populations aquatiques pour cerner les impacts de facteurs de stress externes a des etapes precises du cycle biologique et determiner dans quelle mesure ces impacts sont compenses par des processus de densite-dependence. [Traduit par la Redaction], Introduction Population fluctuations arise from the interplay of density dependence, environmental forcing, and demographic stochasticity (Bjornstad and Grenfell 2001). Population growth and mortality rates are affected by a suite of [...] more...
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- 2022
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7. Effective fisheries management instrumental in improving fish stock status
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Hilborn, Ray, Amoroso, Ricardo Oscar, Anderson, Christopher M., Baum, Julia K., Branch, Trevor A., Costello, Christopher, de Moor, Carryn L., Faraj, Abdelmalek, Hively, Daniel, Jensen, Olaf P., Kurota, Hiroyuki, Little, L. Richard, Mace, Pamela, McClanahan, Tim, Melnychuk, Michael C., Minto, Cóilín, Osio, Giacomo Chato, Parma, Ana M., Pons, Maite, Segurado, Susana, Szuwalski, Cody S., Wilson, Jono R., and Ye, Yimin more...
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- 2020
8. Long-term trends in herring growth primarily linked to temperature by gradient boosting regression trees
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Lyashevska, Olga, Harma, Clementine, Minto, Cóilín, Clarke, Maurice, and Brophy, Deirdre
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- 2020
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9. Highly resolved spatiotemporal simulations for exploring mixed fishery dynamics
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Dolder, Paul J., Minto, Cóilín, Guarini, Jean-Marc, and Poos, Jan Jaap
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- 2020
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10. Blood from a stone: Performance of catch-only methods in estimating stock biomass status
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Free, Christopher M., Jensen, Olaf P., Anderson, Sean C., Gutierrez, Nicolas L., Kleisner, Kristin M., Longo, Catherine, Minto, Cóilín, Osio, Giacomo Chato, and Walsh, Jessica C.
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- 2020
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11. A game of two halves: Bycatch reduction in Nephrops mixed fisheries
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Cosgrove, Ronán, Browne, Daragh, Minto, Cóilín, Tyndall, Peter, Oliver, Martin, Montgomerie, Mike, and McHugh, Matthew
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- 2019
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12. Decadal changes in the productivity of New England fish populations
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Tableau, Adrien, Collie, Jeremy S., Bell, Richard J., and Minto, Coilin
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Fishes -- Analysis ,Ecosystems -- Analysis ,Earth sciences - Abstract
The Northwest Atlantic continental shelf is a large ecosystem undergoing rapid environmental changes, which are expected to modify the productivity of natural marine resources. Current management of most fished species assumes stationary production relationships or time-invariant recruitment rates. With linear state-space models, we examined the evidence of dynamic productivity for 25 stocks of the Northeast US shelf. We expanded the suite of options available within the state-space approach to produce robust estimates. Fifteen of the stocks exhibited time-varying productivity or changes in their maximum reproductive rate. Few productivity time series are related across the whole region, though adjacent stocks of the same species exhibited similar trends. Some links to region-wide environmental variables were observed. We demonstrate that fish recruitment can often be better predicted over a short-term horizon by accounting for dynamic productivity, which could be valuable for fisheries management. Improving predictions by incorporating environmental covariates or covariance among the stocks must be considered case by case and with caution, as their relationships may change over time. Le plateau continental de l'Atlantique Nord-Ouest est un vaste ecosysteme subissant des changements environnementaux rapides. Ces derniers sont suspectes de modifier la productivite des ressources marines naturelles. Cependant, la gestion actuelle des especes de poissons est basee sur des relations de productivite constantes ou des taux de recrutement constants. A l'aide de modeles lineaires a espace d'etat, la pertinence d'une productivite dynamique est etudiee pour 25 stocks de poissons du plateau Nord-Est des USA. Des estimations robustes ont ete produites en developpant l'approche espace-etat. Quinze des stocks etudies presentent une productivite, ou taux maximum de reproduction, variant dans le temps. Au sein de cet ecosysteme, la productivite des stocks varie rarement de facon semblable. Seuls les stocks d'une meme espece localises dans des zones adjacentes presentent des tendances similaires. Les variables environnementales regionales expliquent tres peu la variabilite temporelle. Nous demontrons que le recrutement est souvent mieux predit a court terme avec une productivite dynamique, ce qui peut etre valorisable pour la gestion des peches. Pour ameliorer la prediction, l'utilisation de covariables environnementales ou de la covariance entre les stocks doit se faire au cas par cas. Comme ces relations ne persistent pas toujours dans le temps, leur utilisation doit faire l'objet de precautions prealables., Introduction Productivity--the capacity of a fish population to increase in numbers and mass--is affected by variations in the recruitment rate, body growth, and survival success (Shelton et al. 2006). The [...] more...
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- 2019
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13. Including unsexed individuals in sex-specific growth models
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Minto, Coilin, Hinde, John, and Coelho, Rui
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Animal development -- Research ,Dimorphism (Biology) -- Research ,Zoological research ,Earth sciences - Abstract
Sexually dimorphic growth models are typically estimated by fitting growth curves to individuals of known sex. Yet, macroscopically ascribing sex can be difficult, particularly for immature animals. As a result, sex-specific growth curves are often fit to known-sex individuals only, omitting unclassified immature individuals occupying an important region of the age-length space. We propose an alternative whereby the sex of the unclassified individuals is treated as a missing data problem to be estimated simultaneously with the sex-specific growth models. The mixture model that we develop includes the biological processes of growth and sexual dimorphism. Simulations show that where the assumed growth model holds, the method improves precision and bias of all parameters relative to the data omission case. Ability to chose the correct combination of sex-specific and sex-generic parameters is also improved. Application of the method to two shark species, where sex can be ascribed from birth, indicates improvements in the fit but also highlights the importance of the assumed model forms. The proposed method avoids discarding unclassified observations, thus improving our understanding of dimorphic growth. L'estimation des modeles de croissance dimorphe selon le sexe repose typiquement sur le calage de courbes de croissance sur des individus de sexe connu. Cependant, la determination macroscopique du sexe peut s'averer difficile, en particulier pour les animaux immatures. Les courbes de croissance selon le sexe sont donc souvent calees seulement sur des individus de sexe connu, les individus immatures non classes, qui occupent une region importante de l'espace age-longueur, etant omis. Nous proposons une autre approche dans laquelle le sexe des individus non classes est traite comme un probleme de donnees manquantes devant etre estimees en meme temps que les modeles de croissance selon le sexe. Le modele de melange que nous developpons comprend les processus biologiques de croissance et de dimorphisme sexuel. Les simulations demontrent que, quand le modele de croissance postule s'avere correct, la methode ameliore la precision et le biais de tous les parametres par rapport a l'approche avec omission de donnees. La capacite de choisir la bonne combinaison de parametres dependants et independants du sexe s'en trouve aussi amelioree. L'application de la methode a deux especes de requins, dont le sexe peut etre determine des la naissance, indique des ameliorations du calage, mais souligne egalement l'importance des formes de modele postulees. La methode proposee permet d'eviter de rejeter des observations non classees, ameliorant du coup la comprehension de la croissance dimorphe. [Traduit par la Redaction], Introduction Growth is a central process in the life history of an organsim (Beverton and Holt 1957; Werner 1986; Starck and Ricklefs 1998; Nentwig 2012) and describing growth is a [...] more...
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- 2018
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14. Fishery production potential of large marine ecosystems: A prototype analysis
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Fogarty, Michael J., Rosenberg, Andrew A., Cooper, Andrew B., Dickey-Collas, Mark, Fulton, Elizabeth A., Gutiérrez, Nicolás L., Hyde, Kimberly J.W., Kleisner, Kristin M., Kristiansen, Trond, Longo, Catherine, Minte-Vera, Carolina V., Minto, Cóilín, Mosqueira, Iago, Osio, Giacomo Chato, Ovando, Daniel, Selig, Elizabeth R., Thorson, James T., and Ye, Yimin more...
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- 2016
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15. Bio-physical model provides insight into dispersal of plaice (Pleuronectes platessa L.) from putative spawning grounds to nursery areas on the west coast of Ireland
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Zölck, Melanie, Brophy, Deirdre, Mohn, Christian, Minto, Cóilín, and McGrath, David
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- 2015
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16. Defining value per unit effort in mixed métier fisheries
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Davie, Sarah, Minto, Cóilín, Officer, Rick, and Lordan, Colm
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- 2015
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17. Application of finite mixture models to catch rate standardization better represents data distribution and fleet behavior
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Cosgrove, Ronan, Sheridan, Michael, Minto, Cóilín, and Officer, Rick
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- 2014
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18. Oocyte dynamics and reproductive strategy of Aphanopus carbo in the NE Atlantic—Implications for fisheries management
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Ribeiro Santos, Ana, Minto, Cóilín, Connolly, Paul, and Rogan, Emer
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- 2013
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19. Interactions between small pelagic fish and young cod across the North Atlantic
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Minto, Cóilín and Worm, Boris
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- 2012
20. The rise and fall of autumn-spawning herring (Clupea harengus L.) in the Celtic Sea between 1959 and 2009: Temporal trends in spawning component diversity
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Harma, Clémentine, Brophy, Deirdre, Minto, Cóilín, and Clarke, Maurice
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- 2012
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21. Rebuilding Global Fisheries
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Worm, Boris, Hilborn, Ray, Baum, Julia K., Branch, Trevor A., Collie, Jeremy S., Costello, Christopher, Fogarty, Michael J., Fulton, Elizabeth A., Hutchings, Jeffrey A., Jennings, Simon, Jensen, Olaf P., Lotze, Heike K., Mace, Pamela M., McClanahan, Tim R., Minto, Cóilín, Palumbi, Stephen R., Parma, Ana M., Ricard, Daniel, Rosenberg, Andrew A., Watson, Reg, and Zeller, Dirk more...
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- 2009
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22. Productivity dynamics of Atlantic cod
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Minto, Coilin, Flemming, Joanna Mills, Britten, Gregory Lee, and Worm, Boris
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Agricultural research ,Population biology -- Research ,Agricultural productivity -- Management ,Company business management ,Earth sciences - Abstract
Productivity is a central determinant of population dynamics with consequences for population viability, resilience to exploitation, and extinction. In fish, the strength of a cohort is typically established during early life stages. Traditional approaches to measuring productivity do not allow for interannual variation in the maximum reproductive rate, a parameter governing population productivity. Allowing such process variation provides the ability to track dynamic changes instead of assuming a static productivity regime. Here we develop and evaluate a multivariate stock-recruitment state-space model to simultaneously estimate time-varying stock productivity and synchronicity of dynamics across populations. We apply the method to North Atlantic cod (Gadus morhua) populations, showing that the productivity of early life stages has varied markedly over time, with many populations at historically low productivity. Trends in productivity were similar in some adjacent populations but less regionally coherent than previously thought, particularly in the Northwest Atlantic. Latitudinal variation in the Northeast Atlantic suggests a differential response to environmental change. We conclude that time-varying productivity provides a useful framework that integrates across many dimensions of environmental change affecting early life history dynamics. La productivite est un determinant central de la dynamique des populations, qui a des repercussions sur la viabilite de la population, la resilience a l'exploitation et la disparition. Chez les poissons, la force d'une cohorte s'etablit typiquement durant les premiers stades du cycle de vie. Les approches traditionnelles de mesure de la productivite ne permettent pas de variations interannuelles du taux de reproduction maximum, un parametre qui regit la productivite de la population. En permettant de telles variations, il devient possible de suivre les changements dynamiques plutot que de presumer que le regime de productivite est statique. Nous avons mis au point un modele d'espace d'etats de la relation stock-recrutement afin d'estimer simultanement la productivite variable dans le temps des stocks et le synchronisme de la dynamique de differentes populations. Nous avons applique cette methode aux populations de morues de l'Atlantique Nord et demontre une variabilite marquee de la productivite des premiers stades du cycle de vie dans le temps, la productivite de nombreuses populations en etant actuellement a un creux historique. Les tendances en matiere de productivite etaient semblables pour certaines populations voisines, mais moins coherentes que prevu a l'echelle regionale, particulierement en ce qui concerne le nord-ouest de l'Atlantique. Les variations latitudinales dans le nord-est de l'ocean Atlantique semblent indiquer des variations dans l'espace en ce qui concerne les reactions aux perturbations environnementales. Nous concluons que la productivite variable dans le temps constitue un cadre utile qui fournit une representation integree sur plusieurs dimensions des modifications du milieu qui ont une incidence sur la dynamique des premiers stades du cycle de vie. [Traduit par la Redaction], Introduction During their early life history, fish are most vulnerable to competition, predation, hydrography, temperature, and a host of other environmental factors that result in extraordinarily high levels of natural [...] more...
- Published
- 2014
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23. A new role for effort dynamics in the theory of harvested populations and data-poor stock assessment
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Thorson, James T., Minto, Coilin, Minte-Vera, Carolina V., Kleisner, Kristin M., and Longo, Catherine
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Animal populations -- Distribution ,Population biology -- Research ,Fisheries -- Management ,Fish industry -- Management ,Company business management ,Company distribution practices ,Earth sciences - Abstract
Research shows that population status can be predicted using catch data, but there is little justification for why these predictions work or how they account for changes in fisheries management. We demonstrate that biomass can be reconstructed from catch data whenever fishing mortality follows predictable dynamics over time (called 'effort dynamics'), and we develop a state-space catch only model (SSCOM) for this purpose. We use theoretical arguments and simulation modeling to demonstrate that SSCOM can, in some cases, estimate population status from catch data. Next, we use meta-analysis to estimate effort dynamics for US West Coast groundfishes before and after fisheries management changes in the mid-1990s. We apply the SSCOM using meta-analytic results to data for eight assessed species and compare results with stock assessment and data-poor methods. Results indicate general agreement among all three methods. We conclude that effort dynamics provides a theoretical basis for using catch data to reconstruct biomass and has potential for conducting data-poor assessments. However, we still recommend that index and compositional data be collected to allow application of data-rich methods. Si la recherche a demontre que l'etat des populations peut etre predit a l'aide de donnees sur les prises, les travaux justifiant la pertinence de ces predictions et leur adequation pour expliquer les changements dans la gestion des peches demeurent tres limites. Nous demontrons que la biomasse peut etre reconstituee a partir de donnees sur les prises quand la mortalite par peche suit une dynamique previsible dans le temps (appelee la'dynamique de l'effort') et, a cette fin, developpons un modele d'espace d'etats reposant uniquement sur les prises (SSCOM). Nous faisons appel a des arguments theoriques et la simulation pour demontrer que le SSCOM peut, dans certains cas, estimer l'etat de la population a partir de donnees sur les prises. Nous utilisons ensuite la metaanalyse pour estimer la dynamique de l'effort pour les poissons de fond de la cote Ouest americaine avant et apres des changements a la gestion des peches au milieu des annees 1990. Nous appliquons le SSCOM en utilisant les resultats de la metaanalyse a des donnees pour huit especes evaluees et comparons les resultats a des methodes d'evaluation des stocks et reposant sur des donnees limitees. Les resultats indiquent une bonne concordance, en general, des trois methodes. Nous en concluons que la dynamique de l'effort constitue une base theorique pour l'utilisation de donnees sur les prises dans le but de reconstituer la biomasse et pourrait etre utile pour des evaluations basees sur des donnees limitees. Nous recommandons toutefois que des donnees indicielles et compositionnelles soient recueillies pour permettre l'application de methodes axees sur des donnees abondantes. [Traduit par la Redaction], Introduction Marine fisheries globally have an enormous value in terms of food production, employment, and income for small- and large-scale fishers (Ye et al. 2012). However, the vast majority of [...] more...
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- 2013
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24. Potential for domesticated-wild interbreeding to induce maladaptive phenology across multiple populations of wild Atlantic salmon (Salmo salar)
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Fraser, Dylan J., Minto, Coilin, Calvert, Anna M., Eddington, James D., and Hutchings, Jeffrey A.
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Phenology -- Research ,Atlantic salmon -- Environmental aspects ,Salmon fisheries -- Environmental aspects ,Earth sciences - Abstract
We report how aquaculture may negatively alter a critical phenological trait (developmental rate) linked to survival in wild fish populations. At the southern limit of the species range in eastern North America, the persistence of small Atlantic salmon (Salmo solar) populations may be constrained by interbreeding with farmed salmon that escape regularly from intensive aquaculture facilities. Using a common-garden experimental protocol implemented over an 8-year period, we show that embryos of farmed salmon and multigenerational farmed-wild hybrids ([F.sub.1], [F.sub.2], wild backcrosses) had slower developmental rates than those of two regional wild populations. In certain cases, our data suggest that hybrid developmental rates are sufficiently mismatched to prevailing environmental conditions that they would have reduced survival in the wild. This implies that repeated farmed-wild interbreeding could adversely affect wild populations. Our results therefore reaffirm previous recommendations that based on the precautionary principle, improved strategies are needed to prevent, or to substantially minimize, escapes of aquaculture fishes into wild environments. Resume: Nous demontrons comment 1'aquaculture peut affecter negativement un trait phenologique essentiel (le taux de developpement) lie a la survie des populations sauvages de poissons. A la limite sud de l'aire de repartition de l'espece dans Test de l'Amerique du Nord, la persistance de petites populations de saumons atlantiques (Salmo salar) peut etre res-treinte par des croisements avec des saumons d'elevage qui s'echappent regulierement des installations d'aquaculture intensive. A l'aide d'un protocole experimental de jardin commun maintenu sur une periode de 8 annees, nous montrons que les embryons de saumons d'elevage et des hybrides de plusieurs generations de saumons sauvages et eleves (retrocroise-ments en nature de [F.sub.1] et de [F.sub.2]) ont des taux de developpement plus lents que les poissons de deux populations regionales sauvages. Dans certains cas, nos donnees indiquent que les taux de developpement des hybrides sont suffisamment mesap-paries aux conditions prevalentes de l'environnement qu'ils auraient reduit la survie en nature. Ceci donne a entendre que des croisements repetes entre des poissons d'elevage et des poissons sauvages pourraient affecter negativement les populations sauvages. Nos resultats nous amenent done a reaffirmer les recommandations anterieures basees sur le principe de precaution voulant que des strategies ameliorees soient necessaires pour empecher, ou reduire a un strict minimum, la fuite de poissons d'elevage vers les environnements sauvages. [Traduit par la Redaction], Introduction Unparalleled declines of many wild fish populations, coupled with growing aquaculture production, have made it critical to assess the potential risks associated with interactions between wild and escaped farmed [...] more...
- Published
- 2010
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25. Trends in the abundance of marine fishes
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Hutchings, Jeffrey A., Minto, Coilin, Ricard, Daniel, Baum, Julia K., and Jensen, Olaf P.
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Company business management ,Market trend/market analysis ,Marine ecology -- Forecasts and trends ,Biological diversity -- Management -- Forecasts and trends ,Fish populations -- Forecasts and trends - Abstract
The Convention on Biological Diversity (CBD) established a target in 2002 to reduce the rate of biodiversity loss by 2010. Using a newly constructed global database for 207 populations (108 species), we examine whether the 2010 target has been met for marine fishes, while accounting for population biomass relative to maximum sustainable yield, [B.sub.MSY]. Although rate of decline has eased for 59% of populations declining before 1992 (a pattern consistent with a literal interpretation of the target), the percentage of populations below [B.sub.MSY] has remained unchanged and the rate of decline has increased among several top predators, many of which are below 0.5[B.sub.MSY]. Combining population trends, a global multispecies index indicates that marine fishes declined 38% between 1970 and 2007. The index has been below [B.sub.MSY] since the mid-1980s and stable since the early 1990s. With the exception of High Seas pelagic fishes and demersal species in the Northeast Pacific and Australia-New Zealand, the multispecies indices are currently below [B.sub.MSY] in many regions. We conclude that the 2010 CBD target represents a weak standard for recovering marine fish biodiversity and that meaningful progress will require population-specific recovery targets and associated time lines for achieving those targets. Resume: La Convention sur la diversite biologique ([much less than] CBD ≫) s'est donnee en 2002 comme objectif de reduire le taux de perte de la biodiversite avant 2010. Utilisant une nouvelle base de donnees globale de 207 populations (108 especes), nous examinons si l'objectif 2010 de la CBD a ete atteint pour les poissons marins, tout en tenant compte de la biomasse des populations relative au rendement maximal durable, [B.sub.MSY]. Malgre une diminution du taux de declin chez 59 % des populations en chute avant 1992 (une tendance qui correspond a une interpretation litterale de l'objectif 2010 de la CBD), le pourcentage des populations sous [B.sub.MSY] s'est maintenu constant et le taux de declin s'est accelere chez plusieurs des predateurs sommitaux, une majorite desquels sont a un niveau inferieur a 0,5[B.sub.MSY]. Combinant les tendances des populations, un indice global multi-especes montre que les poissons marins ont diminue de 38 % entre 1970 et 2007. L'indice est inferieur a [B.sub.MSY] depuis le milieu des annees 1980 et stable depuis le debut des annees 1990. Avec l'exception des populations pelagiques de haute mer et des populations demersales du nord-est du Pacifique et de Nouvelle-Zelande-Australie, les indices multi-especes sont presentement sous [B.sub.MSY] dans plusieurs regions. Nous concluons que l'objectif CBD 2010 represente un faible standard pour recuperer la biodiversite des poissons marins et qu'un progres reel requerra des cibles claires de recupe ration specifiques a chacune des populations et soumises a des echeanciers stricts pour atteindre les objectifs vises., Introduction The United Nations declared 2010 to be the International Year of Biodiversity. This was a direct response to initiatives by the Convention on Biological Diversity (CBD) to (i) conserve [...] more...
- Published
- 2010
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26. Survival variability and population density in fish populations
- Author
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Minto, Coilin, Myers, Ransom A., and Blanchard, Wade
- Subjects
Environmental issues ,Science and technology ,Zoology and wildlife conservation - Abstract
To understand the processes that regulate the abundance and persistence of wild populations is a fundamental goal of ecology and a prerequisite for the management of living resources. Variable abundance [...] more...
- Published
- 2008
27. Operationalizing Ensemble Models for Scientific Advice to Fisheries Management
- Author
-
Jardim, Ernesto, primary, Azevedo, Manuela, additional, Brodziak, Jon, additional, N. Brooks, Elizabeth, additional, F. Johnson, Kelli, additional, Klibansky, Nikolai, additional, P. Millar, Colin, additional, Minto, Coilin, additional, Mosqueira, Iago, additional, D.M. Nash, Richard, additional, Vasilakopoulos, Paris, additional, and K. Wells, Brian, additional more...
- Published
- 2020
- Full Text
- View/download PDF
28. Applying a New Ensemble Approach to Estimating Stock Status of Marine Fisheries around the World
- Author
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Rosenberg, Andrew, Kleisner, Kristin M, Afflerbach, Jamie, Anderson, Sean C., Dickey-Collas, Mark, Cooper, Andrew B., Fogarty, Michael J., Fulton, Elizabeth A., Gutierrez, Nicolas L., Hyde, Kimberly J.W., Jardim, Ernesto, Jensen, Olaf P., Kristiansen, Trond, Longo, Catherine, Minte-Vera, Carolina V., Minto, Coilin, Mosqueira, Iago, Osio, Giacomo Chato, Ovando, Daniel, Selig, Elizabeth R, Thorson, James T., Walsh, Jessica C., and Ye, Yimin more...
- Subjects
landings ,global fisheries ,data-limited fisheries ,fisheries exploitation status ,food security ,superensemble ,ecosystem sustainability ,management - Abstract
The exploitation status of marine fisheries stocks worldwide is of critical importance for food security, ecosystem conservation, and fishery sustainability. Applying a suite of data-limited methods to global catch data, combined through an ensemble modeling approach, we provide quantitative estimates of exploitation status for 785 fish stocks. Fifty-three percent (414 stocks) are below B-MSY and of these, 265 are estimated to be below 80% of the B-MSY level. While the 149 stocks above 80% of B-MSY are conventionally considered "fully exploited," stocks staying at this level for many years, forego substantial yield. Our results enable managers to consider more detailed information than simply a categorization of stocks as "fully" or "over" exploited. Our approach is reproducible, allows consistent application to a broad range of stocks, and can be easily updated as new data become available. Applied on an ongoing basis, this approach can provide critical, more detailed information for resource management for more exploited fish stocks than currently available. more...
- Published
- 2018
29. Inclusion of ecological, economic, social, and institutional considerations when setting targets and limits for multispecies fisheries
- Author
-
Rindorf, Anna, Dichmont, Catherine M., Thorson, James, Charles, Anthony, Clausen, Lotte Worsoe, Degnbol, Poul, Garcia, Dorleta, Hintzen, Niels T., Kempf, Alexander, Levin, Phillip, Mace, Pamela, Maravelias, Christos, Minto, Coilin, Mumford, John, Pascoe, Sean, Prellezo, Raul, Punt, Andre E., Reid, David G., Roeckmann, Christine, Stephenson, Robert L., Thebaud, Olivier, Tserpes, George, Voss, Ruediger, Rindorf, Anna, Dichmont, Catherine M., Thorson, James, Charles, Anthony, Clausen, Lotte Worsoe, Degnbol, Poul, Garcia, Dorleta, Hintzen, Niels T., Kempf, Alexander, Levin, Phillip, Mace, Pamela, Maravelias, Christos, Minto, Coilin, Mumford, John, Pascoe, Sean, Prellezo, Raul, Punt, Andre E., Reid, David G., Roeckmann, Christine, Stephenson, Robert L., Thebaud, Olivier, Tserpes, George, and Voss, Ruediger more...
- Abstract
Targets and limits for long-term management are used in fisheries advice to operationalize the way management reflects societal priorities on ecological, economic, social and institutional aspects. This study reflects on the available published literature as well as new research presented at the international ICES/Myfish symposium on targets and limits for long term fisheries management. We examine the inclusion of ecological, economic, social and institutional objectives in fisheries management, with the aim of progressing towards including all four objectives when setting management targets or limits, or both, for multispecies fisheries. The topics covered include ecological, economic, social and governance objectives in fisheries management, consistent approaches to management, uncertainty and variability, and fisheries governance. We end by identifying ten ways to more effectively include multiple objectives in setting targets and limits in ecosystem based fisheries management. more...
- Published
- 2017
- Full Text
- View/download PDF
30. Changes in the size structure of marine fish communities
- Author
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Bell, Richard J., Collie, Jeremy, Branch, Trevor A., Fogarty, Michael J., Minto, Coilin, Ricard, Daniel, Bell, Richard J., Collie, Jeremy, Branch, Trevor A., Fogarty, Michael J., Minto, Coilin, and Ricard, Daniel more...
- Abstract
Marine ecosystems have been heavily impacted by fishing pressure, which can cause major changes in the structure of communities. Fishing directly removes biomass and causes secondary effects such as changing predatory and competitive interactions and altering energy pathways, all of which affect the functional groups and size distributions of marine ecosystems. We conducted a meta-analysis of eighteen trawl surveys from around the world to identify if there have been consistent changes in size-structure and life history groups across ecosystems. Declining biomass trends for larger fish and invertebrates were present in nine systems, all in the North Atlantic, while seven ecosystems did not exhibit consistent declining trends in larger organisms. Two systems had alternative patterns. Smaller taxa, across all ecosystems, had biomass trends with time that were typically flat or slightly increasing. Changes in the ratio of pelagic taxa to demersal taxa were variable across the surveys. Pelagic species were not uniformly increasing, but did show periods of increase in certain regions. In the western Atlantic, the pelagic-to-demersal ratio increased across a number of surveys in the 1990s and declined in the mid 2000s. The trawl survey data suggest there have been considerable structural changes over time and region, but the patterns are not consistent across all ecosystems. more...
- Published
- 2017
31. Changes in the size structure of marine fish communities
- Author
-
Bell, Richard J, primary, Collie, Jeremy S, additional, Branch, Trevor A, additional, Fogarty, Michael J, additional, Minto, Coilin, additional, and Ricard, Daniel, additional
- Published
- 2017
- Full Text
- View/download PDF
32. lhmixr: Fit Sex-Specific Life History Models with Missing Classifications
- Author
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Minto, Coilin, primary and Hinde, John, additional
- Published
- 2017
- Full Text
- View/download PDF
33. Scientific, Technical and Economic Committee for Mediterranean Fisheries Assessments Part 1 (STECF-15-11)
- Author
-
Cardinale, Massimiliano, Abella, J.A., Martín, Paloma, Scarcella, Giuseppe, Guijarro, Beatriz, Jadaud, Angélique, Ligas, Alessandro, Lleonart, Jordi, Mannini, Alessandro, Maynou, Francesc, Minto, Coilin, Murenu, Matteo, Orio, Alessandro, Pengal, Polona, Pérez-Gil, José Luis, Quetglas, Antoni, Ramírez, John, Recasens, Laura, Sbrana, Mario, Scott, Finlay, Spedicato, Maria Teresa, Vasilakopoulos, Paraskevas, Cardinale, Massimiliano, Abella, J.A., Martín, Paloma, Scarcella, Giuseppe, Guijarro, Beatriz, Jadaud, Angélique, Ligas, Alessandro, Lleonart, Jordi, Mannini, Alessandro, Maynou, Francesc, Minto, Coilin, Murenu, Matteo, Orio, Alessandro, Pengal, Polona, Pérez-Gil, José Luis, Quetglas, Antoni, Ramírez, John, Recasens, Laura, Sbrana, Mario, Scott, Finlay, Spedicato, Maria Teresa, and Vasilakopoulos, Paraskevas more...
- Published
- 2015
34. Changes in the size structure of marine fish communities.
- Author
-
Bell, Richard J., Collie, Jeremy S., Branch, Trevor A., Fogarty, Michael J., Minto, Coilin, and Ricard, Daniel
- Subjects
FISH conservation ,WILDLIFE conservation ,WILDLIFE habitat improvement ,WILDLIFE rescue ,ENVIRONMENTAL protection ,ENVIRONMENTAL impact analysis - Abstract
Marine ecosystems have been heavily impacted by fishing pressure, which can cause major changes in the structure of communities. Fishing directly removes biomass and causes secondary effects such as changing predatory and competitive interactions and altering energy pathways, all of which affect the functional groups and size distributions of marine ecosystems. We conducted a meta-analysis of eighteen trawl surveys from around the world to identify if there have been consistent changes in size-structure and life history groups across ecosystems. Declining biomass trends for larger fish and invertebrates were present in nine systems, all in the North Atlantic, while seven ecosystems did not exhibit consistent declining trends in larger organisms. Two systems had alternative patterns. Smaller taxa, across all ecosystems, had biomass trends with time that were typically flat or slightly increasing. Changes in the ratio of pelagic taxa to demersal taxa were variable across the surveys. Pelagic species were not uniformly increasing, but did show periods of increase in certain regions. In the western Atlantic, the pelagic-todemersal ratio increased across a number of surveys in the 1990s and declined in the mid 2000s. The trawl survey data suggest there have been considerable structural changes over time and region, but the patterns are not consistent across all ecosystems. [ABSTRACT FROM AUTHOR] more...
- Published
- 2018
- Full Text
- View/download PDF
35. PREDATION ON PRERECRUITS CAN DELAY REBUILDING OF DEPLETED COD STOCKS.
- Author
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Collie, Jeremy, Minto, Coilin, Worm, Boris, and Bell, Richard
- Subjects
- *
PREDATION , *ATLANTIC herring , *CODFISH , *FISH populations , *FISHING - Abstract
Predation by clupeoid species (e.g., Atlantic herring, Clupea harengus Linnaeus, 1758) on the early life stages of gadoids is hypothesized to be an important source of mortality, especially for Atlantic cod, Gadus morhua Linnaeus, 1758. Adult cod also prey on herring, creating a positive feedback process ("trophic triangle") that may result in alternative dominance patterns of cod or herring depending on the relative levels of mortality. We estimated the effect of herring on cod recruitment with a predator-dependent Ricker stock-recruitment function, fit to time-series data. In this formulation, herring gradually reduce the per capita recruitment rate of cod, but this predation does not result in depensatory dynamics. We incorporated this predator-dependent recruitment function into a multispecies length-based model (LeMans) of Georges Bank, northeast US shelf, to investigate the consequences of predation mortality for the recovery of cod from overfishing. In LeMans, all fished species undergo the same size-dependent fishing mortality, following a logistic selection curve. We investigated two fishing patterns: a selective (L50 = 65 cm) and an unselective fishery (L50 = 15 cm). The effect of predation on prerecruits was more pronounced under selective fishing because herring were spared as a result of their small size. In rebuilding scenarios with selective fishing, cod started at low abundance and herring at high abundance. Without fishing, cod could rebuild in 10 yrs even with predation mortality before recruitment. In contrast, with low levels of fishing mortality, rebuilding took 25 yrs and even longer with such predation. These results suggest that predation on prerecruits and fishing can combine to delay rebuilding of depleted cod stocks. [ABSTRACT FROM AUTHOR] more...
- Published
- 2013
- Full Text
- View/download PDF
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