Changes between Version 1 and Version 2 of EwEugAssignHabitats


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Timestamp:
2010-11-23 09:29:40 (9 years ago)
Author:
shermanl
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  • EwEugAssignHabitats

    v1 v2  
    11== 10.5 Assign habitats == 
    2 Once habitats have been defined (see [wiki:EwEugDefineEcospaceHabitats Define Ecospace habitats]), (and sketched onto the [wiki:EwEugBasemap Basemap]), the components of the underlying Ecopath model must be assigned to their ‘preferred’ habitat. ‘Preferred’ here means that the group in question will be adapted such that 
     2Once habitats have been defined (see [wiki:EwEugDefineEcospaceHabitats Define Ecospace habitats]), (and sketched onto the [wiki:EwEugBasemap Basemap]), the components of the underlying Ecopath model must be assigned to their 'preferred' habitat. 'Preferred' here means that the group in question will be adapted such that 
    33 
    44 * its feeding rate and hence its growth rate as well are higher in that habitat than in others; 
     
    1212However, the first job is to assign groups to habitats, which is easy to do if the habitats have been defined in terms of parameters that are themselves easy to determine. 
    1313 
    14 Note organisms at the upper trophic levels, due to their high mobility will tend to ‘prefer’ a wide range of habitats rather than a specific one. 
     14Note organisms at the upper trophic levels, due to their high mobility will tend to 'prefer' a wide range of habitats rather than a specific one. 
    1515 
    16 Also note that definition of habitat in Ecospace usually includes the entire water column, from the surface to the bottom.  Thus, while ‘rockfishes’ will tend to be limited to hard bottoms, and burrowing bivalves to soft bottoms, small coastal pelagics, which occur higher up in the water column, may ‘prefer’ hard and soft bottom habitats, as long as both are coastal. 
     16Also note that definition of habitat in Ecospace usually includes the entire water column, from the surface to the bottom.  Thus, while 'rockfishes' will tend to be limited to hard bottoms, and burrowing bivalves to soft bottoms, small coastal pelagics, which occur higher up in the water column, may 'prefer' hard and soft bottom habitats, as long as both are coastal. 
    1717 
    18 Thus, if the habits defined are ‘shallow’ and ‘deep’, assigning the groups to their preferred habitat simply consists of clicking ‘shallow’ for model groups known to limit themselves to shallow waters, and conversely for ‘deep’. 
     18Thus, if the habits defined are 'shallow' and 'deep', assigning the groups to their preferred habitat simply consists of clicking 'shallow' for model groups known to limit themselves to shallow waters, and conversely for 'deep'. 
    1919 
    20 Note, however, that organisms assigned e.g. to ‘deep’ waters will usually consume preys also assigned to ‘deep’ waters, and conversely for shallow water organisms. Only groups assigned to ‘All’ habitats can be expected to feed indiscriminately in all habitats. 
     20Note, however, that organisms assigned e.g. to 'deep' waters will usually consume preys also assigned to 'deep' waters, and conversely for shallow water organisms. Only groups assigned to 'All' habitats can be expected to feed indiscriminately in all habitats. 
    2121 
    22 In the special case of multi-stanza groups, it will be appropriate, in most cases, to assign the juveniles to one or several inshore/shallow habitats, out of reach of the often ‘cannibalistic’ adults, assigned to habitats that are deeper, or further offshore. 
     22In the special case of multi-stanza groups, it will be appropriate, in most cases, to assign the juveniles to one or several inshore/shallow habitats, out of reach of the often 'cannibalistic' adults, assigned to habitats that are deeper, or further offshore. 
    2323 
    2424[[Image(wiki:EwEugImages:AssignHabitats.bmp)]] 
    2525 
    26 '''Figure 10.7'''  Assign groups to Ecospace habitats. The ‘Ecospace area’ is calculated from the basemap, while the ‘Ecopath area’ is the habitat area fraction assigned to the individual group in the underlying Ecopath model. When Ecospace shows initial imbalance at the start of a simulation it my be because of inappropriate distribution of habitat areas, and a more careful allocation if often required to improve model behaviour. 
     26'''Figure 10.7'''  Assign groups to Ecospace habitats. The 'Ecospace area' is calculated from the basemap, while the 'Ecopath area' is the habitat area fraction assigned to the individual group in the underlying Ecopath model. When Ecospace shows initial imbalance at the start of a simulation it my be because of inappropriate distribution of habitat areas, and a more careful allocation if often required to improve model behaviour.