Changes between Version 1 and Version 2 of EwEugDefineEcospaceHabitats


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Timestamp:
2010-11-23 09:28:55 (9 years ago)
Author:
shermanl
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  • EwEugDefineEcospaceHabitats

    v1 v2  
    11== 10.3 Define Ecospace habitats == 
    2 ‘Habitats’, in Ecospace, are sets of (water) cells sharing certain features affecting the movements, feeding rate, and survival of the Ecopath model components occurring therein. Any number of user defined habitats can be used in Ecospace. 
     2'Habitats', in Ecospace, are sets of (water) cells sharing certain features affecting the movements, feeding rate, and survival of the Ecopath model components occurring therein. Any number of user defined habitats can be used in Ecospace. 
    33 
    44Typically, the features defining habitats are distance from the coast (inshore, offshore…), or depth (shallow, intermediate, deep…) and/or bottom type (rocky, sandy, muddy…). Habitats are thus as easy to define as it is to obtain rough bathymetric maps or maps indicating bottom types. 
    55 
    6 Ideally, the habitats defined in Ecospace should correspond to ‘sub-web’, i.e., to a set of primary producers, herbivorous and other consumers occurring only over that habitat.  Such sub-webs, defined through the diet composition matrix of an Ecopath file may be linked, through higher trophic levels groups, with other sub-webs in the same system, as also occurs in nature. Herein, the higher trophic level groups, through their ability to feed in different habitats, integrate the different subsystem into a whole. 
     6Ideally, the habitats defined in Ecospace should correspond to 'sub-web', i.e., to a set of primary producers, herbivorous and other consumers occurring only over that habitat.  Such sub-webs, defined through the diet composition matrix of an Ecopath file may be linked, through higher trophic levels groups, with other sub-webs in the same system, as also occurs in nature. Herein, the higher trophic level groups, through their ability to feed in different habitats, integrate the different subsystem into a whole. 
    77 
    88Assuming that such sub-webs are implicit in the Ecopath file underlying an Ecospace analysis, all that is needed is to give short descriptive names to the habitat types in question, using the ''Edit habitats'' dialogue box (see below). 
     
    1515Set the dimensions of the map using ''Number of rows'' and ''Number of cols''. Set the length of each (square) cell using ''Cell length''. You can set the physical location of the map using ''Top-left latitude'' and ''Top-left longitude''. 
    1616 
    17 The cells are square units, but the maps not need be so, both square and rectangular maps can be accommodated. Rectangular maps should not be defined too ‘thin’, (i.e., their aspect ratio (AR = height/width) is recommended to remain in the range 5 £ AR £ 0.2). 
     17The cells are square units, but the maps not need be so, both square and rectangular maps can be accommodated. Rectangular maps should not be defined too 'thin', (i.e., their aspect ratio (AR = height/width) is recommended to remain in the range 5 £ AR £ 0.2). 
    1818 
    1919The number of cells in the basemap may range from 4 (for a square 2x2 map, used e.g. for verification or demonstration purposes) to 10,000, (e.g., for a square 100 x 100 map). We recommend, unless otherwise required, the intermediate 20 x 20 map provided as default, which represents a compromise between showing details and maintaining a high computing speed. 
    2020 
    21 Though not contributing to the results, the basemap cells defined as ‘land’ consume memory and computing time. Thus, their number should be kept as small as possible, e.g. by orienting the basemap sideways where appropriate. 
     21Though not contributing to the results, the basemap cells defined as 'land' consume memory and computing time. Thus, their number should be kept as small as possible, e.g. by orienting the basemap sideways where appropriate. 
    2222 
    2323[[Image(wiki:EwEugImages:Habitat.png)]] '''Edit habitats''' 
     
    3030[[Image(wiki:EwEugImages:EditHabitatsDialogue_sc.bmp)]] 
    3131 
    32 '''Figure 10.3''' The Edit habitats dialogue box.''''''''''' 
     32'''Figure 10.3''' The Edit habitats dialogue box. 
    3333 
    3434[[Image(wiki:EwEugImages:MPA.png)]] '''Edit MPAs''' 
     
    4949[[Image(wiki:EwEugImages:Regions.png)]] '''Edit regions''' 
    5050 
    51 Users can also overlay habitats with statistical ‘regions’ (i.e., groups of cells). Regions represent areas of management interest and may or may not have biological significance. Organisms cannot be assigned to regions, only habitats. 
     51Users can also overlay habitats with statistical 'regions' (i.e., groups of cells). Regions represent areas of management interest and may or may not have biological significance. Organisms cannot be assigned to regions, only habitats. 
    5252 
    5353Regions are defined using'' Edit regions'' dialogue box (Figure 10.5), accessible from the Ecospace Basemap form (click on the symbol [[Image(wiki:EwEugImages:Regions.png)]]) or directly from the Ecospace menu.