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- W2917961750 abstract "In 1993, the U.S. government listed the Snowy Plover (Charadrius nivosus; hereafter plover) as threatened under the Endangered Species Act. For the 14 th year, we monitored the breeding population of plovers in coastal northern California (Recovery Unit 2); here, we summarize results of our monitoring efforts including a summary of occupied breeding sites, an overview of lifetime reproductive success, the distribution of corvids within plover breeding habitats, and the occurrence of nests within natural and human-created restoration areas. Seven philopatric yearlings (5 males; 2 females) and one 2-year-old returned to breed in RU2, suggesting that over-winter survival was high. The number of breeding adults (52: 26 males and 26 females) increased slightly over 2013, as did the number of breeding locations (8). Most plovers bred at Clam Beach (48%), Mad River beach (13%), Eel River Wildlife Area (17%), and Centerville Beach (12%). For the first time since 1977, observers found plovers breeding on the North Spit of Humboldt Bay. Plovers initiated 81 nests in RU2, which produced 27 chicks and 17 fledglings. Overall, apparent nesting success (percentage nests hatching at least 1 chick) was 15%, driven by complete failure (n=50) of nests at Clam Beach. Per capita reproductive success was 0.65±1.1 fledglings per male, which was well below the value needed to maintain the population. Lifetime reproductive success was highly skewed toward a few individuals, with 13% of males and 14% of females producing 50% of fledglings. Slow growth of the RU2 population, since a low of 19 breeding adults in 2009, has been driven by consecutive years of high survival and immigration. In 2014, a minimum of 35% of plovers breeding for the first time in RU2 originated from locations elsewhere along the Pacific coast (e.g., RU1), where aggressive management of predators has produced large numbers of yearlings. Continued growth of the RU2 population will require additional efforts to manage predators," @default.
- W2917961750 created "2019-03-02" @default.
- W2917961750 creator A5082871446 @default.
- W2917961750 date "2014-01-01" @default.
- W2917961750 modified "2023-09-26" @default.
- W2917961750 title "Final Report: 2014 Snowy Plover Breeding in Coastal Northern California, Recovery Unit 2" @default.
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