New chorologic contributions to the endangered Isoetes durieui Bory (Isoetaceae, Pteridophyta) in the province of Huelva (Andalusia, Spain)

274 Acta Botanica Malacitana 40. 2015 Recibido el 1 de septiembre de 2015, aceptado para su publicación el 14 de septiembre de 2015 59. NEW CHOROLOGIC CONTRIBUTIONS TO THE ENDANGERED ISOETES DURIEUI BORY (ISOETACEAE, PTERIDOPHYTA) IN THE PROVINCE OF HUELVA (ANDALUSIA, SPAIN) Javier LÓPEZ TIRADO1*, Antonio José SÁNCHEZ ALMENDRO1, José María CARRASCO ANTELO2 & Pablo J. HIDALGO FERNÁNDEZ1 Nuevas aportaciones corológicas para la amenazada Isoetes durieui Bory (Isoetaceae, Pteridophyta) en la provincia de Huelva (Andalucía, España) Key words. Chorology, Pteridophyta, Isoetes durieui, new records, Iberian peninsula. Palabras clave. Corología, Pteridophyta, Isoetes durieui, nuevas citas, Península Ibérica. Isoetes durieui Bory is a terrestrial and primitive vascular plant that belongs to the Pteridophyta Division. Its general distribution comprises the west of the Mediterranean region. It is considered a rare species that grows on siliceous soils, always in temporary ponds or humid areas such as riversides (Prada, 1983). In the Iberian Peninsula it is more frequent in the western part. Nevertheless, disjunct areas can be found in Catalonia and even in the Balearic Islands (Prada, 1987). In Andalusia region (south of Spain) it is endangered and Table 1. Data about the new localities of I. durieui in the province of Huelva. MUNICIPALITYLOCATION COORDINATE (UTM) ELEVATION (m) DATE VOUCHER SAMPLE Nº Aroche Arroyo de la Helechosa 29SPB69 274 06.V.2014 61972 Aroche Barranco de los Frailes 29SPC60 287 20.V.2014 61973 Aroche Rivera de Peramora 29SPC60 223 15.V.2014 61974 Cortegana Barranco de la Panera 29SPB78 273 02.VII.2014 61975 Cortegana Rivera de la Fresnera 29SPB78 273 03.VII.2014 61976 El Campillo Afluente de Rivera del Villar 29SQB07 294 28.V.2014 61977 Rosal de la Frontera Afluente de Barranco de Enmedio 29SPC60 273 07.V.2014 61978 Rosal de la Frontera Barranco de los Vegados 29SPB69 239 17.VI.2014 61979 Rosal de la Frontera Barranco de Valiño 29SPB69 228 17.VI.2014 61980 Santa Bárbara de Casa Arroyo de la Corte 29SPB68 322 04.VI.2014 61981 Santa Bárbara de Casa Rivera de Pierna 29SPB59 274 12.VI.2014 61982 Valverde del Camino Afluente de Barranco de la Parrilleja 29SPB95 198 09.IV.2014 61983 Acta Botanica Malacitana 40. 2015 275 catalogued as vulnerable (Ley 8/2003, de 28 de octubre, de la flora y fauna silvestres; Decreto 23/2012, de 14 de febrero, por el que se regula la conservación y el uso sostenible de la flora y la fauna silvestres y sus hábitats) and included in the red list (Cabezudo and Talavera, 2005). The study area is located in southwestern Iberian Peninsula, corresponding to the province of Huelva (Andalusia, Spain), area which is composed of acid soils in the main. The mean annual rainfall is quite high (around 800-900 mm). These two factors are very important for the establishment of different species within the genus Isoetes. Records from other references (Cabezudo, 1976; Prada, 1983; Rivera and Cabezudo, 1985; Sánchez Gullón and Rubio García, 1999; Delgado Vázquez and Plaza Arregui, 2010) and web sites (such as MUNICIPALITYLOCATION COORDINATE (UTM) ELEVATION (m) DATE VOUCHER SAMPLE Nº Aroche Arroyo de la Helechosa 29SPB69 274 06.V.2014 61972 Aroche Barranco de los Frailes 29SPC60 287 20.V.2014 61973 Aroche Rivera de Peramora 29SPC60 223 15.V.2014 61974 Cortegana Barranco de la Panera 29SPB78 273 02.VII.2014 61975 Cortegana Rivera de la Fresnera 29SPB78 273 03.VII.2014 61976 El Campillo Afluente de Rivera del Villar 29SQB07 294 28.V.2014 61977 Rosal de la Frontera Afluente de Barranco de Enmedio 29SPC60 273 07.V.2014 61978 Rosal de la Frontera Barranco de los Vegados 29SPB69 239 17.VI.2014 61979 Rosal de la Frontera Barranco de Valiño 29SPB69 228 17.VI.2014 61980 Santa Bárbara de Casa Arroyo de la Corte 29SPB68 322 04.VI.2014 61981 Santa Bárbara de Casa Rivera de Pierna 29SPB59 274 12.VI.2014 61982 Valverde del Camino Afluente de Barranco de la Parrilleja 29SPB95 198 09.IV.2014 61983 www.anthos.es and www.gbif.org, last accessed February 2015) have been compiled. This way, seven 10 x 10 km different cells of occurrence has resulted. During a field work in the spring and summer of 2014 twelve new populations have been found. The new voucher samples (tab. 1) have been deposited in the herbarium of the Faculty of Sciences of the University of Cordoba (COFC). Isoetes durieui has been frequently found sharing habitat with I. histrix Bory, being latter more abundant than the target species of this work. In some cases, pure populations of I. durieui composed by numerous specimens have been detected. The current distribution of I. durieui has been updated with seven additional new cells. Consequently, the occurrence of I. durieui has been doubled (10 x 10 km cells) in the province of Huelva (figure 1). On the other hand, it has been observed how different populations have been lost in recent years. The warming projected in the context of global change could affect adversely the ecology and the reproductive biology of this fern (Salvo Tierra, pers. comm.). The lack of colourfulness and size leads to the genus Isoetes to go unnoticed. With some experience on the identification of the natural habitat it is possible to find out new populations, a first step to preserve this species. REFERENCES CABEZUDO, B. -1976Nota corológica sobre la provincia de Huelva. III. Lagascalia 6(2): 251-256. CABEZUDO, B. & S. TALAVERA (coord.) -2005Lista Roja de la Flora Vascular de Andalucía. Junta de Andalucía. Consejería de Medio Ambiente. DELGADO VÁZQUEZ, A. J. & L. PLAZA ARREGUI -2010Helechos amenazados de Andalucía: avances en conservación. Junta de Andalucía. Consejería de Medio Ambiente. Figure 1. Current distribution of I. durieui in the province of Huelva (Andalusia, Spain). Grey cells (10 x 10 km) point out the previously known distribution, whereas the black ones state the new localities. 276 Acta Botanica Malacitana 40. 2015 PRADA, C. -1983El género Isoetes L. en la Península Ibérica. Acta Bot. Malacitana 8: 73-99. PRADA, C. -1987Isoetes L. in CASTROVIEJO, S. et al. (eds.) Flora Ibérica Vol. I: 15-20. C.S.I.C., Madrid. RIVERA, J. & B. CABEZUDO -1985Aportaciones al conocimiento florístico de la Sierra de Aracena (Huelva, España). Acta Bot. Malacitana 10: 61-78. SÁNCHEZ GULLÓN & RUBIO GARCÍA -1999Novedades florísticas para el litoral de Huelva y provincia. I. Lagascalia 21(1):7-16. Authors’ addresses. 1Department of Environmental Biology and Public Health. Faculty of Experimental Sciences, Av. Tres de Marzo s/n 21071. University of Huelva (Spain). 2ENCE, Energía y Celulosa. Ctra, A-5000, K, 7-5. 21007 Huelva. *Corresponding author: javier[email protected]