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Titolo:
Seasonal variation in territory occupancy of non-breeding Long-billed Curlews in intertidal habitats
Autore:
Colwell, MA; Mathis, RL;
Indirizzi:
Humboldt State Univ, Dept Wildlife, Arcata, CA 95521 USA Humboldt State Univ Arcata CA USA 95521 pt Wildlife, Arcata, CA 95521 USA
Titolo Testata:
WATERBIRDS
fascicolo: 2, volume: 24, anno: 2001,
pagine: 208 - 216
SICI:
1524-4695(200108)24:2<208:SVITOO>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
NONBREEDING SHOREBIRDS; PLUVIALIS-SQUATAROLA; GREY PLOVER; CALIFORNIA; BEHAVIOR;
Keywords:
carrying capacity; Humboldt Bay; intertidal habitats; Long-billed Curlew; Numenius americanus; space use; territoriality; tide;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Colwell, MA Humboldt State Univ, Dept Wildlife, Arcata, CA 95521 USA Humboldt State Univ Arcata CA USA 95521 Arcata, CA 95521 USA
Citazione:
M.A. Colwell e R.L. Mathis, "Seasonal variation in territory occupancy of non-breeding Long-billed Curlews in intertidal habitats", WATERBIRDS, 24(2), 2001, pp. 208-216

Abstract

During the non-breeding season, many shorebirds use coastal habitats wheretides influence their dispersion patterns and social systems. We spot-mapped Long-billed Curlews (Numenius americanus) at the Elk River estuary, California to examine variation in territory occupancy troth May 1999-April 2000. Curlew abundance was highest (a maximum of It; territorial and tip to 10non-territorial birds) from July to September, after which time numbers declined progressively to 2-6 in winter. Five curlews were resident on >50% of observation days (N = 133) trout June-April: these individuals returned to the estuary earlier and departed later than 11 other territorial curlews that were present 12-37% of occasions and mostly from July-November. Territory occupancy declined in association with precipitation and diurnal low tides ranging between -0.7 and 1.3 m. The absence of two territorial curlews coincided with rainy periods. The absence of curlews front five territoriescoincided with neap (low) tides; lour of these curlews held territories atlower intertidal elevations with gently sloping topographies, such that they were inundated longer than other territories. At the Elk River estuary. territoriality may limit the number of curlews using intertidal habitats, but individual variation in territory residency suggests that numbers, and possibly carrying capacity, changed seasonally with availability of food in intertidal and pasture habitats. Habitat losses, such as those accompanyingmoderate (25-50 cm) rises in sea level associated with global warming, mayreduce the carrying capacity of estuaries where existing levees preclude creation of new intertidal habitat.

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Documento generato il 31/03/20 alle ore 22:12:06