Seasonality of caulerpenyne content in native Caulerpa prolifera and invasive C. taxifolia and C. racemosa var. cylindracea in the western Mediterranean Sea
نویسندگان
چکیده
Fronds had higher mean caulerpenyne concentration than stolons in Caulerpa prolifera, C. taxifolia and C. racemosa. C. prolifera had higher mean caulerpenyne content w7.29"0.64% caulerpenyne/frond dry weight (DW)x than C. taxifolia (5.47"0.32% caulerpenyne/frond DW) and C. racemosa (0.43"0.07% caulerpenyne/frond DW). C. prolifera had reduced content from May to October in fronds, with no clear seasonal pattern in stolons. C. taxifolia reached a maximum caulerpenyne value in fronds in May, with a slight decrease until the onset of winter; there was no clear seasonal trend in stolons. Caulerpenyne content remained relatively constant through the year in fronds of C. racemosa; stolons showed a clear seasonal pattern of increasing caulerpenyne content in spring, reaching maximum values at the end of summer, and decreasing during winter. C. prolifera caulerpenyne contents were positively correlated with densities of the Caulerpa-feeding gastropod Ascobulla fragilis (rs0.84, p-0.05). The main finding of the present work is that C. prolifera has higher caulerpenyne concentrations than invasive Caulerpa species under similar climate conditions.
منابع مشابه
Mediterranean Species of Caulerpa Are Polyploid with Smaller Genomes in the Invasive Ones
Caulerpa species are marine green algae, which often act as invasive species with rapid clonal proliferation when growing outside their native biogeographical borders. Despite many publications on the genetics and ecology of Caulerpa species, their life history and ploidy levels are still to be resolved and are the subject of large controversy. While some authors claimed that the thallus found ...
متن کاملThe Caulerpa racemosa invasion: a critical review.
Caulerpa racemosa var. cylindracea is a marine Chlorophyta introduced into the Mediterranean Sea from south-western Australia. Since 1990, it has been invading the Mediterranean Sea and the Canary Islands, raising ecological problems. Although this invasion event can be considered as one of the most serious in the history of species introduced into the Mediterranean Sea, C. racemosa has not tri...
متن کاملOn the identity and origin of the Mediterranean invasive Caulerpa racemosa (Caulerpales, Chlorophyta)
Recent morphological and genetic studies on the Caulerpa racemosa (Forsskål) J. Agardh complex have demonstrated that three taxa occur in the Mediterranean Sea. One of them, the ‘invasive variety’, provisionally regarded as close to C. racemosa var. occidentalis J. Agardh, is currently spreading spectacularly throughout the Mediterranean. On the basis of new morphological and molecular studies ...
متن کاملSubtle Effects of Biological Invasions: Cellular and Physiological Responses of Fish Eating the Exotic Pest Caulerpa racemosa
The green alga Caulerpa racemosa var. cylindracea has invaded Mediterranean seabed including marine reserves, modifying the structure of habitats and altering the distributional patterns of associated organisms. However, the understanding of how such invasion can potentially affect functional properties of Mediterranean subtidal systems is yet to be determined. In this study, we show that C. ra...
متن کاملImproving Transferability of Introduced Species’ Distribution Models: New Tools to Forecast the Spread of a Highly Invasive Seaweed
The utility of species distribution models for applications in invasion and global change biology is critically dependent on their transferability between regions or points in time, respectively. We introduce two methods that aim to improve the transferability of presence-only models: density-based occurrence thinning and performance-based predictor selection. We evaluate the effect of these me...
متن کامل