Modelling fish spatial dynamics and local density-dependence relationships: detection of patterns at a global scale
TL;DR: In this article, a model is used to explore whether local density-dependent recruitment relationships can be observed when considering a larger scale, where a virtual population of spawners is tracked within an artificial environment composed of cells.
About: This article is published in Aquatic Living Resources.The article was published on 1998-09-01 and is currently open access. It has received 11 citations till now. The article focuses on the topics: Population.
Citations
More filters
TL;DR: This work considers modelling and other applications, including the role of nearest neighbourhood in experimental design, the representation of connectivity in maps, and a new method for performing field surveys using hexagonal grids, which was demonstrated on montane heath vegetation.
385 citations
Book•
01 Jan 2002
TL;DR: The Human Dimension of Fisheries Science: (P. J. Reynolds, N. Dulvy And C. Roberts) uncovers the human dimension of fisheries science as well as the science and management of fisheries, and some of the aspects of management and ecology that have changed over time.
Abstract: Volume 1: Fish Biology. 1. Banishing Ignorance: Underpinning Fisheries with Basic Biology (P. J. B. Hart and J. D. Reynolds). 2. Phylogeny and Systematics of Fishes (A. C. Gill and R.D. Mooi). 3. Historical Biogeography of Fishes (R. D. Mooi and A. C. Gill). 4. The Physiology of Living in Water (O. Brix). 5. Environmental Factors and Rates of Development and Growth (M. Jobling). 6. Recruitment: Understanding Density--dependence in Fish Populations (R. A. Myers). 7. Life Histories of Fish (J. A. Hutchings). 8. Migration (J. Metcalfe, G. Arnold and R. McDowall). 9. Genetics of Fish Populations (R. D. Ward). 10. Behavioural Ecology of Reproduction in Fish (E. Forsgren, J. D. Reynolds and A. Berglund). 11. Fish Foraging and Habitat Choice: A Theoretical Perspective (G. G. Mittelbach). 12. Feeding Ecology of Piscivorous Fishes (F. Juanes, J. A. Buckel and F. S. Scharf). 13. Fish as Prey (J. Krause, E. M. A. Hensor and G. D. Ruxton). 14. Trophic Ecology and the Structure of Marine Food Webs (N. V.C. Polunin and J.K. Pinnegar). 15. Community Ecology of Freshwater Fishes (L. Persson). 16. Comparative Ecology of Marine Fish Communities (K. Martha M. Jones, D. G. Fitzgerald and P. F. Sale). 17. Interactions Between Fish, Parasites and Disease (I. Barber and R. Poulin). Volume 2: Fisheries. 1. The Human Dimension Of Fisheries Science: (P. J. B. Hart And J. D. Reynolds). 2. Fish Capture Devices In Industrial And Artisanal Fisheries And Their Influence On Management (O. A. Misund, J. Kolding and P. Freon). 3. Marketing Fish (J. A. Young And J. F. Muir). 4. A History Of Fisheries And Their Science And Management (T. D. Smith). 5. Gathering Data For Resource Monitoring And Fisheries Management (D. Evans and R. Grainger). 6. Surplus Production Models (J. T. Schnute And L. Richards). 7. Dynamic Pool Models I: Interpreting The Past Using Virtual Population Analysis (J. G. Shepherd And J. G. Pope). 8. Dynamic Pool Models II: Short--Term And Long--Term Forecasts Of Catch And Biomass (J. G. Shepherd And J. G. Pope). 9. A Bumpy Old Road: Size--Based Methods In Fisheries Assessment (T. J. Pitcher). 10. Ecosystem Models (D. Pauly And V. Christensen). 11. Individual--Based Models (G. Huse, J. Giske And A. G. V. Salvanes). 12. The Economics Of Fisheries (R. Hannesson). 13. Choosing The Best Model For Fisheries Assessment (P. Sparre And P. J. B. Hart). 14. Marine Protected Areas, Fish And Fisheries (N. V. C. Polunin). 15. Exploitation And Other Threats To Fish Conservation (J. D. Reynolds, N. K. Dulvy And C. M. Roberts). 16. Ecosystem Effects Of Fishing (M. J. Kaiser And S. Jennings). 17. Recreational Fishing (I. G. Cowx)
244 citations
TL;DR: This work presents the individual-based model Piscator, which describes a multi-species fish community and demonstrates techniques to deal with the inherent complexity of such a model, and proposes a novel procedure for calibration and analysis, in which the complexity of the model is increased step-by-step.
47 citations
TL;DR: Two individual-based models for the movement of elvers in the French river ‘Adour’ are built and a set of stochastic differential equations and a partial differential equation for the elvers’ density are rigorously obtained.
25 citations
References
More filters
TL;DR: Estimates of spawner abundance and number of surviving progeny for 128 fish stocks indicated only 3 stocks with significant depensation, strengthening the conclusion that depensatory dynamics are not apparent for fish populations at the levels studied.
Abstract: Models of population dynamics in which per capita reproductive success declines at low population levels (variously known as depensation, the Allee effect, and inverse density-dependence) predict that populations can have multiple equilibria and may suddenly shift from one equilibrium to another. If such depensatory dynamics exist, reduced mortality may be insufficient to allow recovery of a population after abundance has been severely reduced by harvesting. Estimates of spawner abundance and number of surviving progeny for 128 fish stocks indicated only 3 stocks with significant depensation. Estimates of the statistical power of the tests strengthen the conclusion that depensatory dynamics are not apparent for fish populations at the levels studied.
476 citations
TL;DR: The evaluation of the evidence for delayed density dependence in population dynamics of 14 forest insects and the effect of regulation lags on the likelihood of detecting direct density dependence suggest that traditional analyses will not detect density-dependent regulation in populations that are characterized by lags and complex dynamic behaviour.
Abstract: SEVERAL recent reviews of published life tables1–3 concluded that density-dependent regulation is infrequent in insect populations, prompting a vigorous debate among eco legists4–10. Little attention, however, has been directed to one issue: most life-table analyses look only for direct (not-lagged) density dependence. Thus, there is a real danger that populations characterized by delays in regulation will be relegated to a density-independent limbo by an analysis not equipped to recognize such behaviour. I have evaluated the evidence for delayed density dependence in population dynamics of 14 forest insects, and assessed the effect of regulation lags on the likelihood of detecting direct density dependence. Eight cases exhibited clear evidence for delayed density dependence and lag-induced oscillations, but direct density dependence was detected in only one of these. This result suggests that traditional analyses will not, in general, detect density-dependent regulation in populations that are characterized by lags and complex dynamic behaviour.
434 citations
351 citations
TL;DR: In this article, the authors extend earlier work on two species to three or more, showing that coexistence of competing species is usually associated with some degree of persistent spatial segregation, even when the environment is uniform.
Abstract: IN a patchy environment, dispersal between neighbouring local populations can allow the total (regional) population to persist1–5; even where all patches are identical and the within-patch dynamics are unstable, the total population readily persists as a metapopulation. This persistence is associated with striking, self-organized spatial patterns in the densities of the subpopulations. In the case of hosts and parasitoids, these may form spiral waves, spatial chaos, or a so-called 'crystal lattice' with regularly spaced knots of high population density4,6. Here we extend earlier work on two species to three or more, showing that coexistence of competing species is usually associated with some degree of persistent spatial segregation, even when the environment is uniform. At its most extreme, this can confine one species to small, relatively static 'islands' within the habitat, giving the appearance of isolated pockets of favourable habitat. The distributions of interacting species may thus result from a trade-off between dispersal and competition within subpopulations, as much as from external factors.
334 citations
Book•
01 Jan 1993
TL;DR: In this paper, 31 papers presented in three theme sessions by fisheries scientists from around the world at a Department of Fisheries and Oceans' workshop in 1991 addressed the use, strengths and weaknesses of commonly-used biological reference points; methods for identifying and quantifying uncertainties associated with using various reference points.
Abstract: This volume contains 31 papers presented in three theme sessions by fisheries scientists from around the world at a Department of Fisheries and Oceans' workshop in 1991 Papers presented address the use, strengths and weaknesses of commonly-used biological reference points; methods for identifying and quantifying uncertainties associated with using various reference points; and alternative management strategies or suggested strategies for dealing with novel situations Answers to specific questions relating to fisheries management, compiled by four working groups at the workshop, are included, as well as a list of participants
292 citations