Daily female counts and fitted census curves in sample years.

• Main Authors: Richard Condit (114548), Sarah G. Allen (11993642), Daniel P. Costa (7359032), Sarah Codde (11993645), P. Dawn Goley (11993648), Burney J. Le Boeuf (11993651), Mark S. Lowry (11993654), Patricia Morris (11993657)
• Format: Still Image
• Language: unknown
• Published: 2022
• Subjects: Evolutionary Biology; Ecology; Inorganic Chemistry; Environmental Sciences not elsewhere classified; Biological Sciences not elsewhere classified; particularly colonial birds; yield total population; total population size; produce population estimates; single count throughout; one count captures; female population size; several additional colonies; northern elephant seals; asynchronous breeding phenology; estimating population size; years within sites; many seasonal species; female count; many years; elephant seals; entire population; single site; seasonal breeders; one day; asynchronous species; yet studied; xlink ">; seven colonies; quantifying asynchrony; minimized error; minimal expenditure; facilitate monitoring; correction factors; correction factor; common problem; 5 days; 30 jan; 2 days; 15 yielded; &# 241; King Range; Elephant Seals
• Online Access: https://doi.org/10.1371/journal.pone.0262214.g002

Black points are observed counts on single days. The black, bell-shaped curve is the fitted census curve, C ( t ); the blue dotted curve is the estimated cumulative arrival curve, A ( t ); and the dotted red curve the cumulative departure curve, D ( t ). A ( t ) and D ( t ) reach an asymptote at the total population of females, N i , using the colony in year i . The examples include years with few counts, demonstrating that the model works well with smaller samples, plus sample years from Point Reyes, King Range, and the Channel Islands; these complement our earlier presentation of the model [ 4 ] in which we included similar figures for 18 years at Año Nuevo Mainland, 1978–2006. Abbreviations: ANI, Año Nuevo Island; ANML, Año Nuevo Mainland; PR, Point Reyes; SNI, San Nicolas Island; KR, King Range. Range of the vertical axis varies greatly, but the dates on the horizontal axis are identical, with vertical lines at 1 Jan, 1 Feb, 1 Mar.