Percorrer por autor "Hortas, Francisco"
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- Genomic footprints of selfing, introduction history, and long-distance dispersal in an invasive alien plantPublication . Sánchez-García, Raúl; Green, Andy J; Ortiz, María A; García, Cristina; Hortas, Francisco; Reynolds, Chevonne; Rowntree, Jennifer; Serrao, Ester A.; Tomasson, Lina; Tremetsberger, Karin; Leeuwen, Casper H A van; Ortego, Joaquín; Sangeet LamichhaneyBiological invasions are natural experiments for studying the evolutionary and ecological processes underlying colonization success and range expansion. Using genome-wide data—generated via genotyping-by-sequencing (GBS) from 30 populations spanning Europe and South Africa—we investigated the colonization history and successful spread of the invasive buttonweed Cotula coronopifolia, an annual plant introduced into Europe from South Africa about 300 years ago. Our analyses identified three major lineages in Europe distributed across the continent, often co-occurring without evidence of admixture. Phylogenomic dating revealed that these lineages diverged > 2,000 years ago—well before the earliest European records—suggesting divergence within the native range and either multiple introductions or a single introduction with multiple lineages. Mating-system inference shows that reproduction occurs primarily via self-fertilization (∼70% on average), although outcrossing predominates in some populations, revealing a facultative mating system. This high selfing rate has led to extremely low heterozygosity in most populations and a strong genetic structure. Genetic clustering also revealed admixed individuals resulting from rare inter-lineage outcrossing; comparisons of empirical and simulated data indicate that increased diversity after sporadic admixture events decays rapidly under subsequent selfing. Both the introduction history and long-distance dispersal facilitated by waterbirds likely explain the scattered distribution of lineages across Europe. Altogether, these results illustrate Baker’s “ideal weed” concept, highlighting the role of a flexible mating system in providing reproductive assurance during colonization and showing how predominant selfing can shape the genomic landscape of an invasive species.
- How threatened are large branchiopods (Crustacea, Branchiopoda) in the Iberian Peninsula?Publication . Garcia-de-Lomas, Juan; Sala, Jordi; Barrios, Violeta; Prunier, Florent; Camacho, Antonio; Machado, Margarida; Alonso, Miguel; Korn, Michael; Boix, Dani; Hortas, Francisco; Garcia, Carlos M.; Serrano, Laura; Munoz, GonzaloThe Iberian Peninsula harbours 24 taxa of native large branchiopods (LBs). Most of them inhabit Mediterranean temporary ponds, which are priority habitats under the EU Habitats Directive. In this work, Iberian LBs were evaluated using IUCN Red List criteria based on geographic range (extent of occurrence, area of occupancy, number of locations, habitat fragmentation and expected decline). Our results show that 46% of the Iberian LBs are threatened: four taxa should be considered as Critically Endangered (Linderiella baetica, Triops emeritensis, Cyzicus tetracerus and Leptestheria mayeti), three taxa fall under the category Endangered (Artemia salina, Tanymastigites lusitanica and Triops vicentinus) and four species (Artemia sp. parthenogenetic strains, Branchinecta orientalis, Lepidurus apus and Triops gadensis) are Vulnerable. Two species (Phallocryptus spinosus, and Maghrebestheria maroccana) are considered Near Threatened. Our results highlight the worrying risk of extinction of Iberian LBs at the regional level, mainly related to the disappearance and degradation of their habitats and the relatively low degree of habitat protection. For Iberian endemic species, this evaluation is also valid at the global level and gives strong support for their inclusion in the IUCN Red List.
- Linderiella baetica Alonso & Garcia-de-Lomas 2009 (Crustacea, Branchiopoda, Anostraca): On the verge of extinction?Publication . Garcia de Lomas, Juan; Garcia, Carlos M.; Hortas, Francisco; Prunier, Florent; Boix, Dani; Sala, Jordi; Leon, David; Serrano, Laura; Prenda, José; Diego Gilbert, Juan; Guerrero, Francisco J.; Marrone, Federico; Sahuquillo, Maria; Camacho, Antonio; Olmo, Carla; Rosa Miracle, Maria; Zamora-Munoz, Carmen; Mura, Graziella; Machado, Margarida; Sanchez, Inigo; Angel Galvez, José; Florencio, Margarita; Luis Perez-Bote, José; Alonso, MiguelThe province of Cadiz (South of Spain) hosts the only known locality in the world of Linderiella baetica Alonso & Garcia-de-Lomas 2009 (Anostraca). In this paper, the geographical distribution of the species based on published sampling data focused on large branchiopods and temporary pools in Andalusia and the entire Iberian Peninsula is assessed. The current situation is summarized based on the threats to their survival, which are mainly related to habitat alteration. In the Iberian Peninsula, at least 1,648 bodies of water (about 720 in Andalusia) have been explored. Prevalence data suggest that L. baetica is a rare species (localities with presence / sample locations = 6.07 . 10-4). The application of the IUCN (2012) criteria suggests that L. baetica is a threatened species, catalogued as "critically endangered". Several emergency solutions such as translocation of individuals or their propagules to newly created ponds and to sustain the efforts of exploration have been proposed. However, conservation of the species in the current circumstances it is not considered viable if the natural habitat remains unprotected. The legal protection of L. baetica is proposed.