Browsing by Author "Hu, Zi-Min"
Now showing 1 - 6 of 6
Results Per Page
Sort Options
- Climate-induced range shifts shaped the present and threaten the future genetic variability of a marine brown alga in the Northwest PacificPublication . Song, Xiao-Han; Assis, Jorge; Jie Zhang, Jie; Gao, Xu; Cho, Han-Gil; Duan, De-Lin; Serrao, Ester; Hu, Zi-MinGlaciation-induced environmental changes during the last glacial maximum (LGM) have strongly influenced species' distributions and genetic diversity patterns in the northern high latitudes. However, these effects have seldom been assessed on sessile species in the Northwest Pacific. Herein, we chose the brown alga Sargassum thunbergii to test this hypothesis, by comparing present population genetic variability with inferred geographical range shifts from the LGM to the present, estimated with species distribution modelling (SDM). Projections for contrasting scenarios of future climate change were also developed to anticipate genetic diversity losses at regional scales. Results showed that S. thunbergii harbours strikingly rich genetic diversity and multiple divergent lineages in the centre-northern range of its distribution, in contrast with a poorer genetically distinct lineage in the southern range. SDM hindcasted refugial persistence in the southern range during the LGM as well as post-LGM expansion of 18 degrees of latitude northward. Approximate Bayesian computation (ABC) analysis further suggested that the multiple divergent lineages in the centre-northern range limit stem from post-LGM colonization from the southern survived lineage. This suggests divergence due to demographic bottlenecks during range expansion and massive genetic diversity loss during post-LGM contraction in the south. The projected future range of S. thunbergii highlights the threat to unique gene pools that might be lost under global changes.
- A concise review of the brown seaweed Sargassum thunbergii — a knowledge base to inform large-scale cultivation effortsPublication . Liu, Fu-Li; Li, Jing-Jing; Liang, Zhou-Rui; Zhang, Quan-Sheng; Zhao, Feng-Juan; Jueterbock, Alexander; Critchley, Alan T.; Morrell, Stephen L.; Assis, Jorge; Tang, Yong-Zheng; Hu, Zi-MinSargassum thunbergii is a brown macroalga endemic to the northwest Pacific. It plays important ecological roles in the structure and maintenance of coastal marine ecosystems. The bioactive compounds extracted from S. thunbergii have been extensively documented for potential use in anti-obesity, anti-inflammatory activity, anti-tumor, anti-oxidant and aquacultural drugs. The species is edible and contains relatively high levels of proteins, minerals and several types of amino acids. The present work compiles recently published literature on S. thunbergii, with particular focus on cultivation efforts in China, including the breeding of seedlings and cultivation at sea. A concise review of possible applications is given. Distribution, range shifts associated with past climate change, population genetic structure and connectivity, life history, reproduction and development are all detailed. The review provides important guidelines for future large-scale farming of S. thunbergii. This will help aquaculturalists (phyconomists) to meet the expected increases in demand by industrial users. It will also help to conserve natural populations which may be declining due to destructive harvesting and rapid ocean changes.
- Detecting no natural hybridization and predicting range overlap inSaccharina angustataandSaccharina japonicaPublication . Zhang, Jie; Yotsukura, Norishige; Jueterbock, Alexander; Hu, Zi-Min; Assis, Jorge; Nagasato, Chikako; Yao, Jianting; Duan, DelinNatural hybridization can play a significant role in evolutionary processes and influence the adaptive diversification and speciation of brown seaweeds. However, this phenomenon is as yet unknown inSaccharinakelps.Saccharina angustataand two varieties ofSaccharina japonica(S. japonicavar.japonicaandS. japonicavar.diabolica) partly overlap in distribution along the Pacific coast of Hokkaido, which makes them a good model system to study hybridization and introgression among species of the genusSaccharina. Based on 13 highly variable nuclear microsatellites and a mitochondrial marker, we assessed the genetic diversity levels ofS. angustatafor the first time and populations from Muroran to Shiranuka (western part of the Pacific coast in Hokkaido) exhibited highest genetic diversity. Genetic diversity ofS. japonicawas higher inS. japonicavar.japonicaas compared withS. japonicavar.diabolica. There was significant genetic differentiation (F-ST > 0.25,p < 0.05) betweenS. japonicaandS. angustatabased on both markers. Moreover, there was poor genetic connectivity and limited interspecific hybridization among these closely relatedSaccharinaspecies. Ecological niche models projected a northward expansion of bothS. japonicaandS. angustataunder future climate scenarios and a range overlap between two species along the coast of Okhotsk Sea in Kamchatka Peninsula. The interspecific hybridization and genetic diversity among these kelps provide insights for kelp selection and cultivation as well as future conservation strategies of wild stocks.
- 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.
- Roadmap to sustainably develop the European seaweed industryPublication . Jueterbock, Alexander; Hoarau-Heemstra, Hindertje; Wigger, Karin; Duarte, Bernardo; Bruckner, Christian; Chapman, Annelise; Duan, Delin; Engelen, Aschwin; Gauci, Clément; Hill, Griffin; Hu, Zi-Min; Khanal, Prabhat; Khatei, Ananya; Mackintosh, Amy; Meland, Heidi; Melo, Ricardo; Nilsen, Anne M. L.; Olsen, Leonore; Rautenberger, Ralf; Reiss, Henning; Zhang, JieHow to build a sustainable seaweed industry is important in Europe's quest to produce 8 million tons of seaweed by 2030. Based on interviews with industry representatives and an expert-workshop, we developed an interdisciplinary roadmap that addresses sustainable development holistically. We argue that sustainable practices must leverage synergies with existing industries (e.g. IMTA systems, offshore wind farms), as the industry develops beyond experimental cultivation towards economic viability.
- The invasive alga Gracilaria vermiculophylla in the native northwest Pacific under ocean warming: Southern genetic consequence and northern range expansionPublication . Liu, Yi-Jia; Zhong, Kai-Le; Jueterbock, Alexander; Satoshi, Shimada; Choi, Han-Gil; Weinberger, Florian; Assis, Jorge; Hu, Zi-MinOcean warming is one of the most important factors in shaping the spatial distribution and genetic biodiversity of marine organisms worldwide. The northwest Pacific has been broadly illustrated as an essential seaweed diversity hotspot. However, few studies have yet investigated in this region on whether and how past and ongoing climate warming impacted the distribution and genetic pools of coastal seaweeds. Here, we chose the invasive species Gracilaria vermiculophylla as a model, and identified multiple genetic lineages in the native range through genome-scale microsatellite genotyping. Subsequently, by reconstructing decadal trends of sea surface temperature (SST) change between 1978 and 2018, we found that SST in northern Japan and the East China Sea indeed increased broadly by 0.25-0.4 degrees C/decade. The projections of species distribution models (SDMs) under different future climate change scenarios (RCP 2.6, RCP 4.5, RCP 6.0 and RCP 8.5) indicated that a unique genetic pool of G. vermiculophylla at its current southern range limit (i.e. the South China Sea) is at high risk of disappearance, and that the populations at its current northern range limit (i.e. in Hokkaido region) will undergo poleward expansions, particularly by the year 2100. Such responses, along with this species' limited dispersal potential, may considerably alter the contemporary distribution and genetic composition of G. vermiculophylla in the northwest Pacific, and ultimately threaten ecological services provided by this habitat-forming species and other associated functional roles.