An alternative method for calf density and recruitment estimation using pregnancy on wild guanacos (Lama guanicoe).

MAROZZI, ANTONELA; PANEBIANCO ANTONELLA; GOMEZ FACUNDO; SCHROEDER NATALIA; GREGORIO PABLO; MORENO, PABLO; OVEJERO AGUILAR, RAMIRO; PEÑA, FIAMA; LEGGIERI, LEONARDO R.; CARMANCHAHI, PABLO

Congreso; Society of Mathematical Biology Annual Meeting.; 2020

Per capita recruitment is a parameter that determines most of thevariation in population growth rate in wild ungulates of temperateenvironments and it is generally estimated by young female ratio Ithas been proposed that this approach should be improved since onlycount data is used in most cases and the probability of observingcalves at heel declines with the age of the calf because it is moreindependent of the mother In this study, we propose an alternativemethod to estimate calf density ( using pregnancy rateobtained from hormonal fecal metabolites and total densityestimates Then we use ACD to calculate recruitment byyoung female ratio and compare the results with recruitmentestimates using traditional count data ( To set the parametersof ACD we used information of a partially migratory guanacopopulation (Puig 1987 Ruiz Blanco et al 2014 Schroeder et al 2014Fig 1 of La Payunia Provincial Reserve (Mendoza Argentina)