. The Canadian field-naturalist. EUST COGR RODO RODO RWBL PIEDMONT WHITE MTNS MODO. WODU NOFL RODO EVGR EUST AMRO COGR RBGU Figure 4. Relative biomass (%) of avian prey items comprising >2% of total biomass recovered from Peregrine Falcon nests in the Champlain (1 eyrie, n = 6), Green/Taconic (4 eyries, n = 13), Piedmont (3 eyries, n = 8) and White Mountain (11 eyries, n = 24) ecoregions in northern New York and New England, 1989-1996. The overall sample (n = 51) included a minimum of 480 individuals from 50 different taxa at 19 eyries for a total biomass of kg. Abbreviations: AMRO, Am
. The Canadian field-naturalist. EUST COGR RODO RODO RWBL PIEDMONT WHITE MTNS MODO. WODU NOFL RODO EVGR EUST AMRO COGR RBGU Figure 4. Relative biomass (%) of avian prey items comprising >2% of total biomass recovered from Peregrine Falcon nests in the Champlain (1 eyrie, n = 6), Green/Taconic (4 eyries, n = 13), Piedmont (3 eyries, n = 8) and White Mountain (11 eyries, n = 24) ecoregions in northern New York and New England, 1989-1996. The overall sample (n = 51) included a minimum of 480 individuals from 50 different taxa at 19 eyries for a total biomass of kg. Abbreviations: AMRO, American Robin, Tiirdus migratorius; BLJA, Blue Jay. Cyanocitta cristata; COGR, Common Crackle, Quiscalus quiscula; EUST, European Starling. Stitmiis vul- garis; EVGR, Evening Grosbeak. Coccothrautes vespertimis; KIDE, Killdeer, Charadrius vocifenis: MODO, Mourning Dove, Zenaida macroiira: NOFL. Northern Flicker, Colaptes auratiis; RWBL. Red- winged Blackbird, Agelaiiis phoeiiiceus; RBGU. Ring-billed Gull, Larus delawarensis; RODO, Rock Dove, Columba livia; SBDO, Short-billed Dowitcher. Limnodromiis griseiis; WODU, Wood Duck, Aix sponsa. productivity in the northeastern (Hickey 1942; Hagar 1969; Herbert and Herbert 1969), and should allow for continued population growth, especially because density dependence was lacking, and many historically-occupied cliffs were vacant (Faccio and Corser 1995). An earlier investigation of a reestab- lished peregrine population in the mid-Atlantic recovery region (Steidl et al. 1991) found slightly higher productivity () but lower nest success (62%) rates. Given the large size of the White Mountain ecore- gion (Figure 1) and the abundant cliff habitat there, it is notable that peregrine reproductive performance was significantly lower than in some other NNYNE ecoregions (Table 2; Figure 3). Our analyses indicat- ed that this was not related to density dependent or. Please note that these images are extracted from scanned page images that
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