First record of Pucrolia minuta (Sörensen, 1884) (Opiliones: Gonyleptidae) in Buenos Aires province: a case of recent expansion?

Elián L. GUERRERO, Ana L. GADDI, María José APODACA

Abstract


The Mesopotamian harvestmen are a faunistic set whose distribution coincides with the Argentinean Mesopotamia wetlands and surrounding areas as the Humid Chaco, north Buenos Aires province and eastern Uruguay. Pucrolia minuta (Sörensen, 1884) (Gonyleptidae: Pachylinae) is a Mesopotamian harvestman that lives in highly humid sites and tree dominated physiognomies. In this work, we cite for the first time this species in Buenos Aires province. The new record is located 400 km further south from the previously known collecting sites of the species, in the provinces of Entre Ríos and Santa Fe. The new finding site, in the Pampean plain, is associated to a Eucalyptus sp. (Myrtaceae) tree plantation in a highly modified area by agricultural and livestock activities. Due to its ecological requirements, its limited dispersal abilities and the adverse climatic pulses for its presence that occurred in the Pampean plain between the Pleistocene and the XIX century is improbable that a population of P. minuta had survived during this temporal lapse in the region. Possibly, the species has recently colonized the zone by anthropocory or by its natural dispersal abilities across non-native tree galleries in water courses of north Buenos Aires

Keywords


Anthropocory; Climatic change; Dispersal; Gallery forests; Pampean plain

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