scholarly journals TESTING A SPATIALLY EXPLICIT, INDIVIDUAL-BASED MODEL OF RED-COCKADED WOODPECKER POPULATION DYNAMICS

2005 ◽  
Vol 15 (5) ◽  
pp. 1495-1503 ◽  
Author(s):  
Karin Schiegg ◽  
Jeffrey R. Walters ◽  
Jeffery A. Priddy
Keyword(s):  
Population Dynamics ◽  
Spatially Explicit ◽  
Individual Based Model ◽  
Red Cockaded Woodpecker

scholarly journals A full life cycle and spatially explicit individual-based model for the giant mud crab (Scylla serrata): a case study from a marine protected area

2013 ◽  
Vol 71 (3) ◽  
pp. 484-498 ◽  
Author(s):  
J.-O. Meynecke ◽  
R. G. Richards
Keyword(s):  
Population Dynamics ◽  
Life Cycle ◽  
Marine Protected Area ◽  
Multiple Stressors ◽  
Individual Variability ◽  
Population Increase ◽  
Scylla Serrata ◽  
Spatially Explicit ◽  
Mud Crab ◽  
Individual Based Model

Abstract The giant mud crab (Scylla serrata) is an important fisheries species throughout southeast Asia and the South Pacific. In Australia, marine protected areas (MPAs) and fish habitats have been declared specifically to protect the local populations of S. serrata. The cannibalistic behaviour of S. serrata coupled with the potential attraction of increased predators may counteract the effect of excluding fishing from these areas as a means of increasing the local crab population. The population dynamics of S. serrata could also be confounded by the spatio-temporal variability in environmental conditions (e.g. run-off and temperature). Here, we used a spatially explicit individual-based model (IBM) to explore the population dynamics of S. serrata in an MPA located in southern Moreton Bay, Queensland, Australia. This IBM simulated the life cycle dynamics of individual S. serrata and integrated the key processes affecting its population dynamics. These processes include physical transport of the planktonic life stages, movement, growth, metamorphosis, setting, reproduction, spawning, harvesting, and predation. Individual variability was built into the model to account for demographic variation. The modelled scenarios indicated that the effect of the different harvest strategies trialled on the population dynamics after 30 months and the MPA influenced the number of individuals in the creek system resulting in a partial 35% population increase. Further development and application of this model has implications for MPAs and catch limits under multiple stressors including climate change.

Assessment of the key evolutionary traits that prevent extinctions in human-altered habitats using a spatially explicit individual-based model

2020 ◽  
Vol 415 ◽  
pp. 108823 ◽  
Author(s):  
Eva Graciá ◽  
Roberto C. Rodríguez-Caro ◽  
Ana Sanz-Aguilar ◽  
José D. Anadón ◽  
Francisco Botella ◽  
...  
Keyword(s):  
Spatially Explicit ◽  
Individual Based Model

scholarly journals Estimating Internal Migration in Contemporary Mexico and its Relevance in Gridded Population Distributions

Data ◽  
2019 ◽  
Vol 4 (2) ◽  
pp. 50 ◽  
Author(s):  
Bryan Jones ◽  
Fernando Riosmena ◽  
Daniel H. Simon ◽  
Deborah Balk
Keyword(s):  
Population Dynamics ◽  
Residential Mobility ◽  
Environmental Data ◽  
Spatially Explicit ◽  
Economic Data ◽  
Mobility Data ◽  
Population Distributions ◽  
Long Form ◽  
Mexican Government ◽  
Spatially Explicit Data

Given downward trends in fertility and mortality, population dynamics –and thus theestimation of spatially-explicit population dynamics and gridded population and derivativeproducts– are increasingly sensitive to mobility processes and their changes in spatiality. In thispaper, we present a procedure to produce origin-destination intermunicipal/intercounty andinterstate migration matrices, briefly discussing their use and application in gridded populationproducts. To illustrate our approach, we produce total and sex-specific matrices with informationfrom the 2000 and 2010 Mexican Census long-form 10% surveys. We share the code required toreproduce the extraction of these and for potentially at least another 122 country-periods based onharmonized publicly-available data from IPUMS International, which allow for the addition ofancillary social and economic data and individual and household levels, or IPUMS Terra, whichfurther allow for GIS-based mapping, visualization, and manipulation and for the merging ofimportant contextual, e.g., environmental, data. Besides discussing the likely limitations of thesemeasures, using official projections from the Mexican government, we illustrate howmigration/mobility data improve the estimation of spatial/gridded population dynamics. We wrapup with a call for the collection of more adequate, spatially-explicit data on residential mobility andmigration globally.

The role of large-scale spatially explicit and small-scale localized processes on the population dynamics of cereal aphids

2005 ◽  
Vol 95 (6) ◽  
pp. 579-587 ◽  
Author(s):  
L. Winder ◽  
G.J.K. Griffiths ◽  
J.N. Perry ◽  
C.J. Alexander ◽  
J.M. Holland ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Spatial Pattern ◽  
Large Scale ◽  
Aphid Population ◽  
Small Scale ◽  
Spatially Explicit ◽  
Cereal Aphids ◽  
Field Scale ◽  
Crop Density ◽  
Activity Density

AbstractA field-scale study of the spatially explicit interaction between the carabid Poecilus cupreus Linnaeus, and two common aphid species (Sitobion avenae (Fabricius) and Metopolophium dirhodum (Walker)) in winter wheat was conducted. All three species showed considerable spatial pattern at the field scale. Activity-density of P. cupreus was an order of magnitude higher in the central part of the field compared to its periphery. Where P. cupreus activity-density was highest, S. avenae and M. dirhodum population peaks were delayed. Additionally, in the case of M. dirhodum, lower maximum counts were evident where P. cupreus activity-density was highest. An analysis of the movement of individual P. cupreus using release–recapture indicated that those beetles within the centre of the field exhibited reduced displacement, which may have caused the generation or maintenance of spatial pattern. Crop density was also measured throughout the field. Although crop density had no large-scale spatial pattern, its variability at the small-scale was consistent with an influence on aphid population dynamics. This study demonstrates empirically that both large-scale spatially explicit and small-scale localized processes influenced aphid population dynamics simultaneously.

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