Extensive spread of farmed seaweeds causes a shift from native to non-native haplotypes in natural seaweed beds

Tano, Stina; Halling, Christina; Lind, Emma; Buriyo, Amelia S.; Wikström, Sofia A.

doi:10.1007/s00227-015-2724-7

Cited by 39 publications

(33 citation statements)

References 41 publications

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“…Seaweed aquaculture has been developed primarily in Asia 2 3 , and to date, fewer than 20 species have been domesticated 4 . More than 90% of worldwide farming activities concentrate on five taxa 2 5 6 : the brown kelps Saccharina and Undaria and the red algae Porphyra, Gracilaria and Eucheuma.…”

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confidence: 99%

“…However, little is known about the effects of these two processes on the genetic structure of the populations of S. japonica that are cultivated at present. In addition, some studies showed that the escaped cultivated kelp from the farms might cross-hybridize with wild populations, resulting in genetic introgression of cultivar genetic material into wild populations 3 5 11 29 . It is not known whether a similar gene flow from cultivated to wild populations has occurred for S. japonica .…”

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confidence: 99%

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Effect of domestication on the genetic diversity and structure of Saccharina japonica populations in China

Zhang

Wang

Yao

et al. 2017

Sci Rep

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Saccharina japonica is a commercially and ecologically important seaweed and is an excellent system for understanding the effects of domestication on marine crops. In this study, we used 19 selected simple sequence repeat (SSR) markers to investigate the influence of domestication on the genetic diversity and structure of S. japonica populations. Wild kelp populations exhibited higher genetic diversity than cultivated populations based on total NA, HE, HO, NP and AR. Discriminant analysis of principal components (DAPC), a neighbour-joining (NJ) tree and STRUCTURE analyses indicated that S. japonica populations could be divided into two groups (a cultivated/introduced group and a wild indigenous group) with significant genetic differentiation (P < 0.0001). Divergent selection, continuous inbreeding and inter-specific hybridization have caused the divergence of these two genetically separate gene pools. The significant genetic differentiation between northern and southern cultivated populations appears to be due to inter-specific hybridization and wild germplasm introduction during the domestication process. In addition, the cultivation of S. japonica has not resulted in any serious genetic disturbance of wild introduced S. japonica populations. An understanding of the genetic diversity and genetic structure of domesticated S. japonica will be necessary for further genetic improvement and effective use of germplasm.

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confidence: 99%

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Effect of domestication on the genetic diversity and structure of Saccharina japonica populations in China

Zhang

Wang

Yao

et al. 2017

Sci Rep

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“…Geere [26] reported that 70% of the respondents declared that decrease in seagrass resulted in the decrease in fish catch and 70% of respondents reported the use of dragnet, which contributed to seagrass change. Tano et al [27] reported change in habitats from natural seagrass to nonnative farmed seaweeds.…”

Section: Introductionmentioning

confidence: 99%

Socioeconomic Determinants of Mangrove Exploitation and Seagrass Degradation in Zanzibar: Implications for Sustainable Development

Nchimbi

Lyimo

2019

Journal of Marine Biology

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The concept of “sustainability” has become the current answer to absolving the world of its environmental and economic crises in the 21st century. This paper analyses seven socioeconomic factors (age of household head, household average annual income, marital status of household head, gender of household head, household size, education level of household head, and period of residence of household head) influencing extreme degradation of seagrass and exploitation of mangrove resources in Zanzibar, Tanzania. To accomplish this, Participatory Rural Appraisal approaches and household questionnaire survey were used to obtain information on primary data. Multiple regression analysis and descriptive statistics were used to analyze quantitative data while content analysis was used to analyse qualitative data. The findings revealed that all the socioeconomic variables tested were statistically significant (P<0.05) and had an influence on the exploitation of mangrove and degradation of seagrass except gender of the household (P=0.88) and household annual average income (P=0.655), respectively. In addition, statistical analysis revealed that there was significant difference in the mangrove status between the sites (p= 0.0001, χ2 =27.27) with more exploitation at Charawe compared to Kibele village, whereas no significant differences were revealed in the status of seagrass between the two sites (p= 0.2693, χ2 =1.2202). On one hand, the findings revealed that at Kibele and Charawe 60% and 50% practice gleaning, 40% and 55% are engaged in seaweed farming, and 60% and 70% collect bait from seagrass meadows, respectively. All these activities had direct influence on seagrass status. On the other hand, the finding revealed that livelihood needs, population growth, level of education, and lack of alternative source of income are the key drivers to exploitation of coastal natural resources especially mangrove and seagrasses. To ensure sustainable exploitation of coastal resources alternative livelihood activities such as farmed fish, small/petty business, and agriculture activities that are profitable and easy to manage should be introduced to the local coastal community to enhance active participation in conserving resources and improving their livelihood.

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“…with coral reefs in Hawaii and India (Sulu et al 2004;Zemke-White and Smith 2006;Kamalakannan et al 2014) and degradation of seagrass meadows resulting in decreased seagrass populations in Indonesia (Thomsen et al 2012;Unsworth et al 2018). Such evidence indicates that cultivated seaweed species can be highly competitive and opportunistic, with high growth rates and adaptability in tropical environments (Zuccarello et al 2006;Conklin et al 2009;Kamalakannan et al 2014;Tano et al 2015;Largo et al 2017). The risk of introducing invasive species and of reducing genetic diversity through cultivation was included in fewer frameworks.…”

Section: Insufficient Evidence Of Biosecurity Hazards In Seaweed Aquamentioning

confidence: 99%

An analysis of the current status and future of biosecurity frameworks for the Indonesian seaweed industry

et al. 2020

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Indonesia is the world largest producer of the red seaweeds Kappaphycus and Eucheuma; however, this country is facing significant challenges such as disease outbreaks, epiphyte infestations and a loss in seedling quality. Biosecurity practices have been widely adopted in other aquaculture sectors and when enforced can help to limit the introduction and spread of diseases and pests. To assess current capacity for biosecurity in seaweed aquaculture in Indonesia, a systematic analysis of policy frameworks including legislation, regulatory tools, and national standards was conducted. Biosecurity themes and risks were used to evaluate current national biosecurity content. The results identified major challenges faced by the industry in order to implement biosecurity policies in practice. Barriers to implementation included unspecific reference to the seaweed aquaculture sector, limited variety of approaches to biosecurity, limited use of up-to-date scientific evidence, insufficient guidance for the use of precaution and insufficient inclusion of specific biosecurity hazards. In general, although national regulations are currently under revision, current policies indicate a lack of clarity where biosecurity is included. Six recommendations are suggested to incorporate proactive biosecurity actions into current frameworks, with the aim of improving the health and sustainability of the seaweed aquaculture sector in Indonesia.

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Extensive spread of farmed seaweeds causes a shift from native to non-native haplotypes in natural seaweed beds

Cited by 39 publications

References 41 publications

Effect of domestication on the genetic diversity and structure of Saccharina japonica populations in China

Effect of domestication on the genetic diversity and structure of Saccharina japonica populations in China

Socioeconomic Determinants of Mangrove Exploitation and Seagrass Degradation in Zanzibar: Implications for Sustainable Development

An analysis of the current status and future of biosecurity frameworks for the Indonesian seaweed industry

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