Preliminary studies on pre-dispersal seeds predation of Ramorinoa girolae, in Ischigualasto Provincial Park (San Juan, Argentina)

Sofía PAPÚ, Germán SAN BLAS, Susana LAGOS SILNIK, Claudia M. CAMPOS

Abstract


The objective of this study is to identify the arthropod species that causes seed loss during the pre-dispersal stage of Ramorinoa girolae Speg (chica), in Ischigualasto Provincial Park (San Juan province, Argentina). In January 2013, we randomly collected 10 fruits from the crown of 17 adult R. girolae trees found at three sites separated by approximately 4 km. Each fruit was kept in separate closed jars for 6 months, until the adult arthropods emerged. Different arthropod species were found to be associated with R. girolae fruit. Seed loss was caused by Anypsipyla univitella (Lepidoptera, Pyralidae), whose larva lives inside the fruit and can consume up to 4 seeds during its development. This larva causes up to 60% of seed loss during the pre-dispersal stage. A parasitoid of the genus Goniozus sp. (Himenoptera, Chrysidoidea, Bethylidae) was found in association with the arthropod in more than 65% of the cases.


Keywords


Seed. Fruit. Anypsipyla univitella. Life cycle. Parasitoid. Goniozus sp.

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