Primeros registros de dispersión terrestre en juveniles de Grammostola rosea (Walckenaer, 1837) (Araneae: Theraphosidae) en Chile

Abstract

La dispersión de arañas juveniles ha sido bien documentada en araneomorfas, pero es escasamente conocida en migalomorfas. En este trabajo registramos por primera vez la dispersión terrestre en juveniles de Grammostola rosea con base en una observación de terreno y a siete registros obtenidos a través de programas de ciencia ciudadana (Arañas de Chile, Comunidad Entomológica Chilena, Insectos de Chile-Oficial). Estos juveniles se dispersan formando una sola fila de hasta 160 individuos y de entre dos y cuatro metros de largo. Además, confirmamos el uso de hilos de seda durante el proceso de dispersión. Estos registros ocurrieron en verano (hemisferio sur), principalmente al atardecer y se registraron en la zona central de Chile, entre las regiones de Coquimbo y del Libertador General Bernardo O´Higgins. Este estudio contribuye a un mejor entendimiento de los mecanismos de dispersión de los juveniles de esta especie.

Could an event of extreme drought (2019-2020) affect the feeding ecology of Bubo magellanicus (Gmelin 1788) (Strigiformes: Strigidae) in a Mediterranean region of Chile?

“…Diet composition of B. magellanicus also showed seasonal variation probably influenced by the presence and diversity of prey in the environment ( Nabte, Saba & Pardiñas, 2006 ; Muñoz Pedreros et al., 2017 ; Comay & Dayan, 2018 ). An example of this, is the number of prey units (PU) and biomass quantified in spring (308 PU; 4,293 g) and summer (367 PU; 5,174 g), which would respond to a greater supply of male representatives of G. rosea during their period of reproduction ( Aguilera, Montenegro & Casanueva, 2019 ) or juveniles during terrestrial dispersal events that occur between December and March ( Montenegro-Vargas, Montenegro-Heidke & Aguilera, 2022 ). The high richness of this taxon in the diet of B. magellanicus was due to the exhaustive taxonomic identification of invertebrates, which revealed a high participation in its composition and biomass in comparison to other studies of diet of this owl in Chile ( Yáñez, Rau & Jaksic, 1978 ; Jaksic & Yáñez, 1980 ; Jaksic, Yáñez & Rau, 1986 ; Tala, González & Bonacic, 1995 ; Mella et al, 2016 ; Muñoz Pedreros et al., 2017 ; Martínez, 2018 ; Vega, Jara & Mella, 2018 ; Zuñiga et al, 2022 ).…”

On the life expectancy of a male Chilean rose tarantula, Grammostola rosea(Walckenaer, 1837) (Araneae: Theraphosidae) reared in captivity

“…It was stored in an experimental enclosure in facilities located in cities with a Mediterranean climate. This type of climate, typical of the Mediterranean region, also develops in some regions of Chile (Peel et al 2007) where the species naturally occurs (Aguilera et al 2019(Aguilera et al , 2022. From 2014 to the end of 2019, the specimen was in facilities located in Cádiz (southern Andalusia, purely Mediterranean climate).…”

“…There are still many gaps in its biology and ecology. Basic aspects of lifecycle have not been described until recently (e.g., see Aguilera et al 2022 andMontenegro et al 2022). Also, in-depth studies are necessary to know the natural longevity of the theraphosid spiders and determine the factors that may influence it.…”