PREDATION RATES OF MESOPREDATORS ON CHARADRIUS NIVOSUS NIVOSUS NESTS ALONG A HUMAN-DENSITY GRADIENT

Marina Osechinskaya; Cal Poly Humboldt; mo173@humboldt.edu; Frank Fogarty, Micah Ashford

The Pacific coast distinct population segment (DPS) of western snowy plover (Charadrius nivosus nivosus) is a federally threatened small shorebird that nests primarily on ocean-fronting beaches along the Pacific coast. Recovery Unit 2 (RU2) of this DPS includes Del Norte, Humboldt, and Mendocino counties in northwestern California. RU2 was deemed a ‘population sink,’ which can largely be attributed to the predation risks that corvids and mesopredators such as skunks, opossums, foxes, and raccoons pose on the population. Many questions remain about the relative impact of these predators on snowy plovers, as well as how predator populations are influenced by human activity. We examined whether local human population can have indirect negative consequences on snowy plovers by presenting a comparison of nest predation events due to mesopredators from 2012-2023 to human population density from U.S. Census Bureau data. 42 mesopredator predation events were found from 11 different sites. A generalized linear mixed model found no significant effect on mesopredator predation from human density by census tracts. Further investigation into the effect of human population on mesopredator release throughout the entire range of snowy plovers may help to inform future management decisions.

 

 

Poster Session   Student Paper