TY - JOUR T1 - New insights on the species-specific allelopathic interactions between macrophytes and marine HAB dinoflagellates A1 - Ben Gharbia,Hela A1 - Yahia,Ons Kefi-Daly A1 - Cecchi,Philippe A1 - Masseret,Estelle A1 - Amzil,Zouher A1 - Herve,Fabienne A1 - Rovillon,Georges-Augustin A1 - Nouri,Habiba A1 - M'Rabet,Charaf A1 - Couet,Douglas A1 - Triki,Habiba Zmerli A1 - Laabir,Mohamed AD - Univ Tunis El Manar, Res Grp Oceanog & Plankton Ecol, Tunisian Natl Inst Agron INAT, IRESA Carthage Univ,UR 13ES36 Marine Biol, Tunis, Tunisia. AD - Montpellier Univ, CNRS, IFREMER,IRD, Ctr Marine Biodivers Exploitat & Conservat MARBEC, Montpellier, France. AD - IFREMER Phycotoxins Lab, Nantes, France. AD - IRD, Tunis, Tunisia. AD - CRO, Abidjan, Cote Ivoire. UR - https://archimer.ifremer.fr/doc/00411/52200/ DO - 10.1371/journal.pone.0187963 N2 - Macrophytes are known to release allelochemicals that have the ability to inhibit the proliferation of their competitors. Here, we investigated the effects of the fresh leaves of two magnoliophytes (Zostera noltei and Cymodocea nodosa) and thalli of the macroalgae Ulva rigida on three HAB-forming benthic dinoflagellates (Ostreopsis cf. ovata, Prorocentrum lima, and Coolia monotis). The effects of C. nodosa and U. rigida were also tested against the neurotoxic planktonic dinoflagellate Alexandrium pacificum Litaker sp. nov (former Alexandrium catenella). Co-culture experiments were conducted under controlled laboratory conditions and potential allelopathic effects of the macrophytes on the growth, photosynthesis and toxin production of the targeted dinoflagellates were evaluated. Results showed that U. rigida had the strongest algicidal effect and that the planktonic A. pacificum was the most vulnerable species. Benthic dinoflagellates seemed more tolerant to potential allelochemicals produced by macrophytes. Depending on the dinoflagellate/macrophyte pairs and the weight of leaves/thalli tested, the studied physiological processes were moderately to heavily altered. Our results suggest that the allelopathic activity of the macrophytes could influence the development of HAB species. Y1 - 2017/11 PB - Public Library Science JF - Plos One SN - 1932-6203 VL - 12 IS - 11 ID - 52200 ER -