Coexistence of congeneric native and invasive species: The case of the green algae Codium spp. in northwestern Spain

Irene Rojo, Celia Olabarria, Marta Santamaria, Jim Provan, Tomas Gallardo, Rosa . Viejo

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4 Citations (Scopus)

Abstract

We examined the patterns of distribution and abundance, and reproductive traits (presence of gametophytes and size at time of reproduction) in the invasive Codium fragile ssp. fragile and the native C. tomentosum and C. vermilara on intertidal habitats of NW Spain at two dates. All three species coexist in the locations and habitats studied, although abundances were low. We found a greater proportion of C. fragile ssp. fragile towards the east of the Cantabrian coast and on upper levels on the shore, where conditions are more stressful. The proportion of thalli bearing gametangia in C. fragile ssp. fragile was greater than in the native species in all habitats. The presence of gametangia was size-dependent for all species, with the invasive species maturing at a smaller size, which combined with the previous features, might confer competitive advantages to this species over the native species. We also demonstrated that molecular analyses are necessary for the correct identification of C. fragile subspecies.
Original languageEnglish
Pages (from-to)135-144
Number of pages10
JournalMarine environmental research
Volume101
Early online date30 Sep 2014
DOIs
Publication statusPublished - Oct 2014

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