Distribución de Plagionotus andreui (Fuente, 1908) (Coleoptera: Cerambycidae) y propuesta de acciones de conservación para su planta hospedadora Lavatera triloba L. (Malvaceae) en Andalucía
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Abstract
Durante las dos últimas décadas los cambios en el uso del suelo, como
la intensificación de la agricultura, han provocado un impacto
ambiental sin precedentes. La pérdida y fragmentación de los hábitats
ha aislado y puesto en peligro a numerosas especies y especialmente
a aquellas relacionadas con el paisaje agrario y ruderal. Plagionotus
andreui (Fuente, 1908) (Coleoptera, Cerambycidae) es un endemismo
ibérico con una distribución dispersa por la mitad sur de la península
ibérica y siempre muy localizada. Actualmente, se encuentra
amenazado debido al declive de su planta hospedadora Lavatera
triloba L. (Malvaceae) como consecuencia del cambio en el uso del
suelo, especialmente por la intensificación de la agricultura. Debido a
esto la planta ha quedado relegada a setos aislados o comportándose
como viaria, constituyendo poblaciones muy fragmentadas y con
bajas densidades de individuos. En el presente trabajo se actualiza la
distribución de L. triloba y de P. andreui en Andalucía. P. andreui se
cita por primera vez en las provincias de Huelva y Granada y se
aportan tres nuevas localidades en las provincias de Sevilla y Jaén. El
estado actual de algunas poblaciones de L. triloba y las amenazas
detectadas y potenciales son revisados a escala de rodal en Andalucía.
Los resultados generados de las observaciones realizadas permiten
proponer acciones de conservación autonómicas para esta malvácea.
Algunas de estas acciones son el seguimiento de las poblaciones
conocidas, búsqueda de nuevas localidades de presencia, recolecta y
conservación de semillas en bancos de germoplasma, cultivo de
plantas en la Red de Viveros de Andalucía, refuerzo de poblaciones y
reintroducción en áreas de presencia histórica. Estas propuestas
podrían ayudar a conservar y mejorar este amenazado binomio
específico hospedador-huésped en Andalucía.
During the last two decades land use changes such as intensive agriculture have led to an environmental impact without precedents. Loss and fragmentation of habitats have isolated and threatened several species, especially those related to arable lands and ruderal areas. Plagionotus andreui (Fuente, 1908) (Coleoptera, Cerambycidae) is an Iberian endemic species with a scattered distribution along the southern half of the Iberian Peninsula. Currently, the species is highly threatened due to decline of its host plant Lavatera triloba L. (Malvaceae). This decline is the result of the land use changes (increase of the arable land) within the distribution area. As a consequence, this plant has been relegated to isolated populations in roadsides and crop edges with low population sizes. In the present survey, the distribution of P. andreui and L. triloba is updated. P. andreui is recorded for first time in the provinces of Huelva and Granada. Three new locations in the provinces of Seville and Jaen are provided. The current status of L. triloba populations and potential and observed threats in the known occurrence localities in Andalusia are evaluated at the patch scale. Conservation actions for L. triloba are proposed. These actions could include the monitoring of known populations, locating new populations, collection and preservation of seeds in seed banks, growing plants in the Andalusian nursery network, strengthening of populations, reintroduction in historical patches of occurrence. These proposals could be of help to preserve this threatened specific host-guest complex in Andalusia.
During the last two decades land use changes such as intensive agriculture have led to an environmental impact without precedents. Loss and fragmentation of habitats have isolated and threatened several species, especially those related to arable lands and ruderal areas. Plagionotus andreui (Fuente, 1908) (Coleoptera, Cerambycidae) is an Iberian endemic species with a scattered distribution along the southern half of the Iberian Peninsula. Currently, the species is highly threatened due to decline of its host plant Lavatera triloba L. (Malvaceae). This decline is the result of the land use changes (increase of the arable land) within the distribution area. As a consequence, this plant has been relegated to isolated populations in roadsides and crop edges with low population sizes. In the present survey, the distribution of P. andreui and L. triloba is updated. P. andreui is recorded for first time in the provinces of Huelva and Granada. Three new locations in the provinces of Seville and Jaen are provided. The current status of L. triloba populations and potential and observed threats in the known occurrence localities in Andalusia are evaluated at the patch scale. Conservation actions for L. triloba are proposed. These actions could include the monitoring of known populations, locating new populations, collection and preservation of seeds in seed banks, growing plants in the Andalusian nursery network, strengthening of populations, reintroduction in historical patches of occurrence. These proposals could be of help to preserve this threatened specific host-guest complex in Andalusia.
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Bibliographic citation
Obregón, Ra., Sánchez Gullón, E., Verdugo, A., López Tirado, J.: "Distribución de Plagionotus andreui (Fuente, 1908) (Coleoptera: Cerambycidae) y propuesta de acciones de conservación para su planta hospedadora Lavatera triloba L. (Malvaceae) en Andalucía". Revista de la Sociedad Gaditana de Historia Natural. Vol. 11, (2017), págs. 13- 20, ISSN 1577-2578











