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Updating the Distribution of the Exotic Agave Weevil Scyphophorus Acupunctatus Gyllenhal, 1838 (Coleoptera: Curculionidae) in Peninsular Spain

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Updating the Distribution of the Exotic Agave Weevil Scyphophorus Acupunctatus Gyllenhal, 1838 (Coleoptera: Curculionidae) in Peninsular Spain Anales de Biología 41: 49-53, 2019 ARTICLE DOI: http://dx.doi.org/10.6018/analesbio.41.07 Updating the distribution of the exotic agave weevil Scyphophorus acupunctatus Gyllenhal, 1838 (Coleoptera: Curculionidae) in peninsular Spain Adrián Martín-Taboada, Antonio Román Muñoz & Francisco Díaz-Ruiz Biogeography, Diversity, and Conservation Research Team, Dept. Biología Animal, Facultad de Ciencias, Universidad de Málaga, E-29071, Málaga, Spain. Resumen Correspondence Actualizando la distribución del exótico picudo negro del ágave AR. Muñoz Scyphophorus acupunctatus Gyllenhal, 1838 (Coleoptera: E-mail: [email protected] Curculionidae) en España peninsular Received: 21 January 2019 Las invasiones biológicas se consideran en la actualidad como uno Accepted: 10 April 2019 de los principales factores que condicionan la pérdida de biodiver- Published on-line: 31 May 2019 sidad en el planeta. En las últimas décadas, se ha incrementado el número de especies exóticas/invasoras detectadas en España. Este es el caso del picudo negro (Scyphophorus acupunctatus), un coleóptero (familia Curculionidae) originario de América, especia- lizado en el consumo de plantas de las familias Agavaceae y Dracaenaceae. Detectado por primera vez en España en 2007, en Barcelona, ha sufrido una amplia expansión por todo el arco Medi- terráneo. A partir de la recopilación de citas obtenidas de diferen- tes bases de datos, así como de otras obtenidas por los autores, se presenta una actualización de la distribución de esta especie para la España peninsular, discutiendo su potencial invasor. Palabras clave: Especies exóticas; Insectos; Invasiones biológicas; Mediterráneo; Plaga. Abstract Biological invasions are considered one of the main factors conditioning the loss of biodiversity on the planet. During the last decades an increase in the number of exotic/invasive species has been detected in Spain. This is the case of the agave weevil (Scyphophorus acupunctatus), an American coleoptera (Curcu- lionidae family) specialized in plants of the families Agavaceae and Dracaenaceae. It was detected for the first time in Spain in Barcelona in 2007. Since then it has suffered a wide expansion throughout the Iberian Mediterranean arc. From the compilation of citations obtained from different databases, as well as others obtained by the authors, an update of the distribution of this species is presented for peninsular Spain. We also discussed its invasive potential. Key words: Alien species; Biological invasion; Insects; Mediterranean; Pest. 50 A. Martín-Taboada et al. Anales de Biología 41, 2019 Introduction Alonso-Zarazaga, 2007). From this first record until 2013 the presence of the agave weevil was Human actions are producing environmental alter- confirmed in 25 10x10 km UTM grids located in ations and, as a result, many populations are ex- three isolated areas in Eastern Spain: Barcelona posed to novel perturbations. Exotic species are, (Catalonia, 4 grids), Alicante (Valencia Commu- by definition, taxa that have been introduced out- nity, 15 grids) and Murcia Community (6 grids) side its natural range, through human intervention, (Molina 2013). Since the revision of Molina either intentionally or accidentally (IUCN 2000). (2013), the distribution of the agave weevil in It is widely recognized that invasive alien species peninsular Spain has not been updated. In this pose a serious threat to biodiversity (Pimentel respect, the main aim of this study is to update its 2002), and also that insects have received less at- distribution in peninsular Spain to get a clearer tention concerning their effects on the environ- view of its potential for invasiveness. ment compared to other groups as vertebrates (e.g. Real et al. 2008, Preston et al. 2012), or plants Materials and methods (e.g. McCary et al. 2016, Nelson et al. 2017), even being an important part of the alien fauna Information on the evolution of the distribution of worldwide (Kenis et al. 2009). invasive alien species is difficult to obtain, espe- The agave weevil Scyphophorus acupunctatus cially during the initial stages of the invasion, and is native to Mexico (Vaurie 1971), and a major even more for cryptic species like the agave wee- pest of wild and cultivated Agavaceae and Dra- vil (Terán-Vargas et al. 2012). In this context, we caenaceae species worldwide (Azuara-Domínguez have checked different sources of information to 2013). The international importation of ornamen- obtain new presence data of the agave weevil in tal Agave L. plants has enabled this species to peninsular Spain. First, we reviewed the available establish in many parts of the world, mainly in scientific literature using different search engines Central America and the Caribbean, Africa, Asia, (e.g. ISI Web of Science, Scopus and Google South America (Servín et al. 2006), and more Scholar). We did it using these combinations of recently in Western Europe (Colombo 2000, Riba- keywords: ‘agave weevil’ or ‘Scyphophorus Flinch & Alonso-Zarazaga 2007). This weevil is acupunctatus’ and ‘presence’ or ‘distribution’ and about 12 mm in length, has cryptic habits, and all ‘Iberian Peninsula’ or ‘Spain’. In addition, we per- of its life stages take place inside host tissues formed several searches using Google and the (Terán-Vargas et al. 2012), making its detection same keywords above mentioned in Spanish, in and control difficult. Although it has devastated order to identify new records of the species in lo- populations of Agave crops (Solís-Aguilar et al. cal/regional media and webs platforms. We also 2001, Camino et al. 2002), around the Mediter- requested information to the Environmental Agen- ranean Basin the species damages are mostly cies of the regional governments around the Span- focused on ornamental species, such as the genera ish Mediterranean basin: Andalusia, Catalonia, Agave, Beaucarnea Lem., Dasylirion Zucc., Dra- Murcia and Valencian Community, areas with a caena Vand. ex L. and Yucca L., which also entail high probability of the presence of the agave wee- important economic costs (Riba-Flinch & Alonso- vil, according to the available information (Mo- Zarazaga 2007). Several methods have been tested lina 2013). We also reviewed records from the and implemented for the agave weevil pest man- biodiversity database Biodiversidad Virtual (https: agement in its native distribution range //www.biodiversidadvirtual.org/), a web platform (Rodríguez-Rebollar et al. 2012, Terán-Vargas et which receives data from nature photographers, al. 2012). However, to ensure the effectiveness of who upload pictures of a wide range of taxa, in- any management strategy in areas of new colo- cluding the geographical location where the pic- nization it is crucial to have a good knowledge of tures were taken. All uploaded pictures are its current distribution, as well as information checked by experts in each taxon to confirm the related to the spatial evolution of its populations. species identification. Therefore, we only consid- The presence of this species in the Iberian ered those presences that were previously con- Peninsula is relatively recent, being detected for firmed. Finally, we collected new records ob- the first time in 2007 in a small village close to tained from the fieldwork developed in different Barcelona city (NE Spain) (Riba-Flinch & research projects. All collected data were included Anales de Biología 41, 2019 Scyphophorus acupunctatus in peninsular Spain 51 in a georeferenced database using a Geographic Pérez 2014), and another one that came from a re- Information System (QGIS 1.8.0; QGIS Develop- gional digital newspaper (https://andaluciainfor- ment Team 2013) to associate each record to its macion.es/). The rest of the new grids were ob- corresponding 10x10 km UTM grid. tained from our field work (n= 5). According to these new data, the distribution range of the iso- Results lated populations of Barcelona, Alicante and Mur- cia have increased 1.75x, 3.93x and 1.17x, respec- We have confirmed the presence of the agave tively, being at present almost joined (Figure 1). weevil in 65 new 10x10 km UTM squares (here- We have detected new presences in Andalusia, after grids) (Table 1). Overall, the presence of the where the species has been mostly detected in the agave weevil is currently confirmed in 90 grids, Mediterranean coast (17 new grids), but also in which is an increase of 3.6x in its known distribu- the Atlantic coast, where is already occupying at tion range compared to the distribution map pub- least 2 grids. lished by Molina (2013) (see figure 1 and table 1). Most of the new presences were obtained from the Discussion Biodiversidad Virtual database (n= 37 grids). With respect to the request of information to the envi- The results of our review significantly improve ronmental agencies we only got response from the and update the knowledge about the distribution Catalonia and Valencia Regional Governments (0 of the agave weevil in peninsular Spain. The new and 21new grids, respectively). We only found map quadruples the previously known distribution one scientific paper with a new presence (López- described by Molina (2013). This may seem un- Figura 1. Mapa actualizado de la distribución de Scyphophorus acupunctatus en España peninsular. En azul, la distribución conocida hasta el año 2013 (Molina 2013) y en negro las nuevas presencias obtenidas en este trabajo. Figure 1. Updated map of the distribution of Scyphophorus acupunctatus in peninsular Spain. In blue, the known distribution until the year 2013 and in black the new records obtained in this study. Cataluña/ C. Valenciana/ Andalucía/ Murcia Total Catalonia Valencian Community Andalusia 2013 4 15 6 - 25 2018 3 44 1 17 65 TOTAL 7 59 7 17 90 Tabla 1. Datos de presencia de Scyphophorus acupunctatus en España peninsular, comparación entre datos del año 2013 (Molina 2013) y 2018 (este estudio). Se muestra el número de cuadrículas UTM 10x10 km. Table 1. Presence data of Scyphophorus acupunctatus in peninsular Spain, comparison between the data from the year 2013 and 2018 (present study). The number of 10x10 km UTM grid squares is shown.
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