Papilio esperanza, Esperanza Swallowtail

Periodo de realización: 0001/01/01 al 2018/01/01

Tipo: Capítulo de libro

Lugar(es) de estudio: Oaxaca, México
Resumen: "Pterourus esperanza has been assessed as Endangered. Both the extent of occurrence and area of occupancy fall within the threshold for Endangered. The reported localities from Almaraz-Almaraz et al. (2013), along with a sighting record from GBIF, brings the total number of known localities for this species to four. This provides an estimate of a maximum of four possible locations for this species, with an expected population decline reported by Collins and Morris (1985) and an additional decline in extent and quality of cloud forest habitat that is vulnerable to human activity in terms of land use and the effects of climate change (Almaraz-Almaraz et al. 2013, Collins and Morris 1985, Ponce-Reyes et al. 2012). These factors, in addition to the recent listing of the larval food plant as Near Threatened, also due to deforestation and habitat loss, justify an Endangered listing for the species under criteria B1 and B2. In addition, since Almaraz-Almaraz et al. (2013) estimated the population sizes of males and females as 243±36 and 43±13, respectively, the estimated maximum population size of 335 individuals lies also within the Endangered threshold for the number of mature individuals under criterion C. However, population size should be estimated as twice the number of mature individuals of the limiting sex (here, females), so that the number of mature estimated is likely to be lower, around 112 individuals. As such the species may also qualify as EN under criterion D. As these few occurrences are the only known localities, which represent a single subpopulation, 100% of the mature individuals are found within this single subpopulation. This species would likely greatly benefit from protection and conservation measures for this habitat type. Alongside this, research needs to establish any other existing subpopulations outside of the Sierra de Juárez, and if they exist, establish population size and trend estimates."

Información de ECOSUR