Browsing by Author "Draisma, Stefano G. A."
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- Concise review of the genus Caulerpa J.V. LamourouxPublication . Zubia, Mayalen; Draisma, Stefano G. A.; Morrissey, Kathryn Lee; Varela-Álvarez, Elena; De Clerck, OlivierThe genus Caulerpa is highly diverse, especially in the Caribbean Sea, the Indo-Malay archipelago and the temperate waters of southern Australia. Currently, more than 100 species are recognized worldwide. Despite recent advances in taxonomy and phylogeny, there is still confusion about the delimitation and identification of some species due to tremendous phenotypic plasticity. Caulerpa is known to occupy a wide range of environmental niches and to have great invasive potential. More studies are necessary to understand better the ecology (invasiveness, the functional role of its microbiome) and the biology (reproduction, life cycle, and metabolism) of Caulerpa species, especially for economical species. Very few species, mainly C. lentillifera and C. racemosa known as green caviar, have been cultivated. Caulerpa is consumed mostly in Asia and Oceania, but its popularity tends to be on the increase in western countries with new nutritional practices (vegetarians, vegans, health foods). Being naturally enriched in essential nutrients and various health-promoting compounds, Caulerpa species are promising candidates for the design of functional foods and in the health and well-being sectors. The diversity of Caulerpa offers a remarkable potential for valorization with innovation opportunities. Caulerpa farming can bring significant economic and environmental (e.g., bioremediation, blue carbon pump) benefits if these farms are established in a sustainable approach.
- Intraspecific genetic variation matters when predicting seagrass distribution under climate changePublication . Hu, Zi‐Min; Zhang, Quan‐Sheng; Zhang, Jie; Kass, Jamie M.; Mammola, Stefano; Fresia, Pablo; Draisma, Stefano G. A.; Assis, Jorge; Jueterbock, Alexander; Yokota, Masashi; Zhang, ZhixinSeagrasses play a vital role in structuring coastal marine ecosystems, but their distributional range and genetic diversity have declined rapidly in recent decades. To improve conservation of seagrass species, it is important to predict how climate change may impact their ranges. Such predictions are typically made with correlative species distribution models (SDMs), which can estimate a species' potential distribution under present and future climatic scenarios given species' presence data and climatic predictor variables. However, these models are typically constructed with species-level data, and thus ignore intraspecific genetic variability, which can give rise to populations with adaptations to heterogeneous climatic conditions. Here, we explore the link between intraspecific adaptation and niche differentiation in Thalassia hemprichii, a seagrass broadly distributed in the tropical Indo-Pacific Ocean and a crucial provider of habitat for numerous marine species. By retrieving and re-analysing microsatellite data from previous studies, we delimited two distinct phylogeographical lineages within the nominal species and found an intermediate level of differentiation in their multidimensional environmental niches, suggesting the possibility for local adaptation. We then compared projections of the species' habitat suitability under climate change scenarios using species-level and lineage-level SDMs. In the Central Tropical Indo-Pacific region, models for both levels predicted considerable range contraction in the future, but the lineage-level models predicted more severe habitat loss. Importantly, the two modelling approaches predicted opposite patterns of habitat change in the Western Tropical Indo-Pacific region. Our results highlight the necessity of conserving distinct populations and genetic pools to avoid regional extinction due to climate change and have important implications for guiding future management of seagrasses.
- Linking ecology to genetics to better understand adaptation and evolution: a review in marine macrophytesPublication . Hu, Zi-Min; Zhong, Kai-Le; Weinberger, Florian; Duan, De-Lin; Draisma, Stefano G. A.; Serrao, EsterEcological processes and intra-specific genetic diversity reciprocally affect each other. While the importance of uniting ecological variables and genetic variation to understand species’ plasticity, adaptation, and evolution is increasingly recognized, only few studies have attempted to address the intersection of population ecology and genetics using marine macrophyte as models. Representative empirical case studies on genetic diversity are reviewed that explore ecological and evolutionary processes in marine macrophytes. These include studies on environment-induced phenotypic plasticity and associated ecological adaptation; population genetic variation and structuring driven by ecological variation; and ecological consequences mediated by intraspecific and interspecific diversity. Knowledge gaps are also discussed that impede the connection of ecology and genetics in macrophytes and possible approaches to address these issues. Finally, an eco-evolutionary perspective is advocated, by incorporating structural-tofunctional genomics and life cycle complexity, to increase the understanding of the adaptation and evolution of macrophytes in response to environmental heterogeneity.
- Taxonomic insights into caulerpa (Bryopsidales, Chlorophyta) species in French Polynesia: confirmation of 13 species and reinstatement of c. pickeringii Harvey & BaileyPublication . Lagourgue, Laura; Sauvage, Thomas; Zubia, Mayalen; Draisma, Stefano G. A.; Vieira, António Carlos; Engelen, Aschwin; Payri, Claude E.Caulerpa J.V. Lamouroux is a genus of green macroalgae belonging to the family Caulerpaceae in the order Bryopsidales. The genus comprises 104 currently accepted species, of which 51 have been recorded from Pacific Islands. Among these islands, French Polynesia is found in the middle of the South Pacific Ocean and includes five archipelagos (i.e., the Austral, Gambier, Marquesas, Society, and Tuamotu Islands) where seaweed inventories have reported a total of 16 Caulerpa species so far based on morphology. Here, based on a sampling covering the five archipelagos of French Polynesia, we attempt to (i) verify the taxonomy of Caulerpa species present in these regions based on phylogeny, (ii) describe in more detail the specific diversity between the five archipelagos, and (iii) provide a morphological identification tool for these species. We successfully obtained 134 new tufA sequences for phylogenetic analyses, which corresponded to 13 species. We propose to resurrect C. pickeringii Harvey & Bailey for representatives of C. webbiana var. pickeringii and classify it in the Caulerpa subgenus Araucarioideae. We also transfer C. seuratii to C. pickeringii based on genetic results. A new morphological identification key is provided as well as an updated distribution of Caulerpa species across French Polynesia.