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Estado de los chorlitos ( Charadrius melodus ) en las Grandes Planicies de Norte América: Un modelo demográfico de simulación
Author(s) -
Ryan Mark R.,
Root Brian G.,
Mayer Paul M.
Publication year - 1993
Publication title -
conservation biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.2
H-Index - 222
eISSN - 1523-1739
pISSN - 0888-8892
DOI - 10.1046/j.1523-1739.1993.07030581.x
Subject(s) - plover , endangered species , population , population growth , piping , geography , demography , fishery , biology , ecology , environmental science , habitat , environmental engineering , sociology
A stochastic population growth model using empirical demographic data confirmed that the Piping Plover population of the Great Plains of North America is declining by more than 7% annually. Unchecked, this decline would result in extirpation in approximately 80 years. When recent adult (0.66) and immature (0.60) survival rates were held constant, a 31% increase—from 0.86 to 1.13 chicks fledged per pair—was needed to stabilize the population. Annual population increases of 1% and 2% required 1.16 and 1.19 chicks per pair, respectively. Such growth would result in the Great Plains population reaching the level—(2550 pairs)—needed for delisting from the U.S. Endangered Species Act protection in 53 and 30 years, respectively. One‐ and five‐year delays in the initiation of 1% population growth caused 13 and 67 year delays respectively in reaching recovery.