Browsing by Author "Barahona-Segovia, Rodrigo M."

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    A new flower fly species of Cepa Thompson & Vockeroth (Diptera: Syrphidae from the Valdivian evergreen forest hotspot, Chile
    (2019) Barahona-Segovia, Rodrigo M.; Barcelo, Matias
    The Neotropical region has a high species richness of flower flies. However, there are many known species awaiting proper description. Cepa Thompson & Vockeroth is a Neotropical genus with scattered records and few individuals collected of its three species. In the present study, a female of a new species of Cepa is described, C. simonettii Barahona-Segovia sp. nov., from the Valdivian evergreen forest representing the first record of this genus in Chile. In addition, an identification key to all known species of Cepa is provided. Morphological and biogeographic aspects of this new Cepa species are discussed, as well as the potential phylogenetic relationship with other members of Merodontini.
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    Bad company expands in highland areas: Overlapping distribution, floral resources and habitat suggest competition between invasive and native bumblebees
    (2023) Barahona-Segovia, Rodrigo M.; Smith-Ramirez, Cecilia; Duran-Sanzana, Vanesa; Huaranca, Juan Carlos; Pliscoff, Patricio
    Bumblebees are key pollinators, but their global decline is being driven by factors such as invasive species. Bombus terrestris has invaded many countries, displacing and competing with native bumblebees for resources throughout many different habitats, which causes native populations to decline. In the Chilean highlands, Bombus funebris-a Chilean species under threat-shares its habitat with B. terrestris, suggesting that the two species could be competing for resources (e.g., flowers or habitats) within this ecosystem. However, an information gap in this regard prevents us from proposing conservation measures. Our goals were (1) to assess overlapping distribution between native and invasive Bombus species, (2) to determine any niche overlap in the use of flowers between the two bumblebee species, and (3) to document the predictors that influence their abundance. We conducted a survey in northern Chile between 2017 and 2019 with different latitudinal and altitudinal sampling points to count bumblebees and record their interaction with flowers, both in natural and perturbed habitats. We analyzed their overlapping distribution using the chi-square test and evaluated the use of floral resources and their overlap niche through an interaction network analysis. Predictors and bumblebee abundance were associated with a general linear mixed model. We found the distribution of both bumblebees overlapped by 94.3 %, whereas the overlap niche index (NO) for the common use of flowers was high between B. terrestris and B. funebris (NO = 0.78). The abundance of both bumblebee species was associated with the use of natural scrubland in the highlands. Our results suggest that both species are likely to have a competitive dynamic for floral resources in the high Andean scrubland. As such, we propose implementing an export ban on invasive bumblebee species, coordinating measures between bordering countries, removing any remaining B. terrestris populations, and restoring native flora to attract native pollinators and to provide and manage pollination services in the Chilean highlands.
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    Defining corridors for movement of multiple species in a forest-plantation landscape
    (2020) Pliscoff, Patricio; Simonetti, Javier A.; Grez, Audrey A.; Vergara, Pablo M.; Barahona-Segovia, Rodrigo M.
    Forestry plantations of Pinus radiata, managed through clearcutting method, would offer resistance to the movement of native fauna among remnants of native forest. In this study, we evaluate the possibilities of establishing connectivity corridors for native fauna in a forest landscape dominated by P. radiata, focusing on seven species with some level of specialisation in the use of different land covers and that exhibit different movement strategies. We sampled presences and abundances using several types of sampling to determine the abundance and crossing edge probabilities for the ground-dwelling beetle Ceroglossus chilensis; the mesocarnivores Conepatus chinga, Lycalopex culpaeus and Leopardus guigna; the terrestrial frogs Eupsophus septentrionalis and Pleuroderma thaul, and the understory bird Pteroptochos castaneus. We use species distribution modelling and circuit theory to calculate connectivity for each species. Finally, a spatial priorization approach was applied to obtain two scenarios of least-cost corridors. The results show that species with more specific requirements such as L. guigna, P. castaneus, P. thaul and E. septentrionalis, are unlikely to move through clear cuttings and young plantations, but their movement is possible through adult pine plantations with understory. For species that are habitat generalists such as C. chinga and L. culpaeus plantations were suitable for movement. The management of forest plantations should use multi-taxa assessments in the design of biological corridors that allow the connection of forest fragments. (C) 2020 The Authors. Published by Elsevier B.V.
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    From classical collections to citizen science: change in the distribution of the invasive blowfly Chrysomya albiceps (Wiedemann, 1819) in Chile
    (2021) Barahona-Segovia, Rodrigo M.; Barcelo, Matias
    Tracking the invasion of Chrysomya albiceps (Wiedemann, 1819) (Diptera: Calliphoridae) in South America has multiple distribution gaps. In the present study, we describe the distribution change of this invasive blowfly through time in Chile, using combined methods of collection of occurrences to fill these distributional gaps. We reconstruct the current distribution with entomological collection data, literature. and citizen science. We found that the distribution of C. albiceps expanded only in the central zone of Chile from 2006 to 2011. However, from 2015, the species was recorded in northern Chile. more than 1300 km away from the first locality recorded, through samples and citizen science. We discuss the distribution change and the possible cause of its expansion in the country.