Changes between Version 1 and Version 2 of EwEugRepresentingSeasonalMigrationInEcospace


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Timestamp:
2010-01-31 15:37:47 (10 years ago)
Author:
varunr
Comment:

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  • EwEugRepresentingSeasonalMigrationInEcospace

    v1 v2  
    22Larger organisms commonly have seasonal migration patterns that allow them to utilize favourable seasonal resource and environmental conditions over large spatial areas.  Such movements can be represented in Ecospace in two ways.  First is a simple “Lagrangian” approach that does not require explicit simulation of movement; the idea here is to simply think of the whole Ecospace map as moving in space so as to remain centreed on the distribution of some dominant migratory species.  Second is a more complex “Eulerian” approach, which does involve explicitly modelling changes in instantaneous rates of biomass flow among the Ecospace spatial cells, in some way that approximates at least the changing centre of distribution of the migratory species. 
    33 
    4 The Eulerian approach is implemented in Ecospace by allowing users to define a monthly sequence of “preferred” map cell positions (using the [[Migration.htm|Migration dialogue box]] accessible from the Ecospace [wiki:EwEugeBasemap Basemap] form (Migration patterns are also defined on the ''Basemap'' form) and to define how spread out the migrating fish are likely to be around these preferred cells by setting north-south and east-west “concentration parameters” on the Ecospace [wiki:EwEugDispersal Dispersal] form. 
     4The Eulerian approach is implemented in Ecospace by allowing users to define a monthly sequence of “preferred” map cell positions (using the [wiki:EwEugMigration Migration] dialog box accessible from the Ecospace [wiki:EwEugeBasemap Basemap] form (Migration patterns are also defined on the ''Basemap'' form) and to define how spread out the migrating fish are likely to be around these preferred cells by setting north-south and east-west “concentration parameters” on the Ecospace [wiki:EwEugDispersal Dispersal] form. 
    55 
    66The ''Migration'' dialogue box displays a map of the Ecospace region, with migratory species and months of the year listed.  Preferred position for each month (and the annual trajectory of preferred positions) is set by simply clicking on this map - each such mouse click also triggers the interface to increment the entry month by 1, making it very simple to “sketch” the annual migration trajectory.