DISTRIBUTION MAPS, MIGRATION INFORMATION FOR SPECIES GROUPS AND THIRTY-SEVEN SHOREBIRD SPECIES
Table of Contents
Introduction
Methods
Results
Acknowledgments
Literature Cited
Table 1
Table 2
Figure 1
Figure 2
Figure 3
Species Accounts, Maps, Histograms, and Appendices
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In the following pages, distribution maps for two time periods (January - June and July - December) are provided for species groups (all shorebirds, long distance migrants, intermediate distance migrants, short distance migrants, all plovers, small sandpipers, medium sandpipers, all small shorebirds, all medium shorebirds, and all large shorebirds) and for 37 shorebird species in taxonomic order (see Table 2 for order). The shading patterns on the distribution maps indicate the sum of the maximum number of birds recorded at each site regardless of year within a 100 km2 cell. Refer to the Appendix for more specific count information and locations. Histograms portraying the timing of migration across 5° latitudinal bands from 25°N to 55°N are provided for all species and most species groups. See the Data Analysis section for further explanation of methods. The locations with the greatest number reported for each species/species group are based on information from the Appendix.
Chronology histograms were constructed by summing the maximum number of species/species group reported at each site across seven 5° latitudinal bands for 24 time periods, two time periods per month. Note that there are different scales on the various graphs, identified by shading patterns denoting relative abundance (darker shades are used for greater numbers of birds). The chronology histograms are intended to portray timing rather than spatial distribution or abundance; coverage and abundances differ between latitudinal bands.
Range maps were constructed using information contained in Hayman et al. (1986), Morrison and Ross (1989), Howell and Webb (1995), and respective Birds of North American accounts. On the range maps, solid black denotes breeding range, the stippled pattern denotes winter range, and the hatched pattern denotes year-round residency.
Reference to Figs. 2 and 3 will help in identifying overall patterns relative to migration distance (see maps for species grouped by migration distance). The distribution maps for species groups based on body size can be used in concert with the chronology histograms to suggest guidelines for land managers. Species were grouped by body size as an overall indicator of habitat requirements relative to water depth.