Genetic structure and gene flow of eelgrass Zostera marina populations in Tokyo Bay, Japan: implications for their restoration

Tanaka, Norio; Demise, Teruko; Ishii, Mitsuhiro; Shoji, Yasumasa; Nakaoka, Masahiro

doi:10.1007/s00227-010-1614-2

Cited by 33 publications

(22 citation statements)

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“…) and estimation of gene flow (Tanaka et al . ). Landscape genetics was used (although rarely) as an additional and informative approach to determine whether population differentiation is best explained as a function of environmental differences rather than geographical distances (Gao et al .…”

Section: Meta‐analysis Of the Use Of Genetics In Ecological Restorationmentioning

confidence: 97%

“…To this end, genetic differentiation between potential donor populations across different spatial scales has been used as an ad hoc method to delineate seed transfer zones. Studies used a wide variety of methods to delineate seed transfer zones, including analysis of molecular variance (Krauss & He 2006), principal component analysis (Lloyd et al 2011), clustering methods (Broadhurst 2011), spatial autocorrelation (Krauss & Koch 2004), isolation by distance calculated through Mantel tests (Gonzalo-Turpin et al 2010) and estimation of gene flow (Tanaka et al 2011). Landscape genetics was used (although rarely) as an additional and informative approach to determine whether population differentiation is best explained as a function of environmental differences rather than geographical distances (Gao et al 2012), ultimately allowing the identification of appropriate source populations.…”

Section: Decision-makingmentioning

confidence: 99%

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Contribution of genetics to ecological restoration

et al. 2014

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Ecological restoration of degraded ecosystems has emerged as a critical tool in the fight to reverse and ameliorate the current loss of biodiversity and ecosystem services. Approaches derived from different genetic disciplines are extending the theoretical and applied frameworks on which ecological restoration is based. We performed a search of scientific articles and identified 160 articles that employed a genetic approach within a restoration context to shed light on the links between genetics and restoration. These articles were then classified on whether they examined association between genetics and fitness or the application of genetics in demographic studies, and on the way the studies informed restoration practice. Although genetic research in restoration is rapidly growing, we found that studies could make better use of the extensive toolbox developed by applied fields in genetics. Overall, 41% of reviewed studies used genetic information to evaluate or monitor restoration, and 59% provided genetic information to guide prerestoration decision-making processes. Reviewed studies suggest that restoration practitioners often overlook the importance of including genetic aspects within their restoration goals. Even though there is a genetic basis influencing the provision of ecosystem services, few studies explored this relationship. We provide a view of research gaps, future directions and challenges in the genetics of restoration.

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Section: Meta‐analysis Of the Use Of Genetics In Ecological Restorationmentioning

confidence: 97%

Section: Decision-makingmentioning

confidence: 99%

Contribution of genetics to ecological restoration

et al. 2014

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“…Critically, while estimates of gene flow inferred from measures of genetic differentiation reflected connectivity, only the assignment test could identify directionality. Assignment tests showed that drifting eelgrass ( Zostera marina L.) shoots with attached seeds migrated in alternate directions between meadows in inner and outer Tokyo Bay at distances of several tens of kilometres, with environmental characteristics including local hydrodynamic forces responsible for genetic connectivity (Tanaka, Demise, Ishii, Shoji, & Nakaoka, ).…”

Section: Introductionmentioning

confidence: 99%

Seeds in motion: Genetic assignment and hydrodynamic models demonstrate concordant patterns of seagrass dispersal

et al. 2018

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Movement is fundamental to the ecology and evolutionary dynamics within species. Understanding movement through seed dispersal in the marine environment can be difficult due to the high spatial and temporal variability of ocean currents. We employed a mutually enriching approach of population genetic assignment procedures and dispersal predictions from a hydrodynamic model to overcome this difficulty and quantify the movement of dispersing floating fruit of the temperate seagrass Posidonia australis Hook.f. across coastal waters in south‐western Australia. Dispersing fruit cohorts were collected from the water surface over two consecutive years, and seeds were genotyped using microsatellite DNA markers. Likelihood‐based genetic assignment tests were used to infer the meadow of origin for seed cohorts and individuals. A three‐dimensional hydrodynamic model was coupled with a particle transport model to simulate the movement of fruit at the water surface. Floating fruit cohorts were mainly assigned genetically to the nearest meadow, but significant genetic differentiation between cohort and most likely meadow of origin suggested a mixed origin. This was confirmed by genetic assignment of individual seeds from the same cohort to multiple meadows. The hydrodynamic model predicted 60% of fruit dispersed within 20 km, but that fruit was physically capable of dispersing beyond the study region. Concordance between these two independent measures of dispersal provides insight into the role of physical transport for long distance dispersal of fruit and the consequences for spatial genetic structuring of seagrass meadows.

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“…Eelgrass was chosen as a model seagrass because it has various diaspores and is a well-studied aquatic plant worldwide. Kurihama Bay was also chosen as a model site because it is located at the mouth of Tokyo Bay, where the spatial gradients of water temperature and salinity are gradual (Guo & Yanagi 1996), and there are other eelgrass beds near the study site (Shoji & Hasegawa 2004, Tanaka et al 2011). In addition, we used laboratory experiments to examine the watercolumn dynamics of the diaspores, specifically wheth er they have negative or positive buoyancy.…”

Section: Introductionmentioning

confidence: 99%

Seed dispersal in the seagrass Zostera marina is mostly within the parent bed in a protected bay

Hosokawa¹,

Nakaoka²,

Miyoshi³

et al. 2015

Mar. Ecol. Prog. Ser.

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Seed production and dispersal are key processes in plant population dynamics and gene flow. However, few quantitative studies have followed these processes in aquatic plants. We investigated the abundance of seeds produced and dispersed by the seagrass Zostera marina L. at a protected site within an enclosed bay. We also examined the buoyancy potential of seed dispersal units (diaspores) in the laboratory. Field observations showed that 31% of the total potentially produced seeds were dispersed as decayed reproductive shoots on the sea bottom of the parent bed, whereas 14% were dispersed in spathes (a component of reproductive shoots; seeds are contained inside) detached from live reproductive shoots. However, more than half of the dispersed spathes were negatively buoyant because of the weight of the ripe seeds they contained. Thus, < 6% of potentially produced seeds were dispersed by rafting away from the parent bed. The abundance of ripe seeds dispersed was comparable to that of seeds in the parent bed sediment. The fate of the remaining 54% of total potentially produced seeds was not detected, and they were assumed to be immature or to have been consumed by herbivores. Fewer than 5% of the dispersed seeds had germinated. Our results show that most seeds were dispersed within the parent bed, supporting one of the fitness-related seed-dispersal hypotheses, namely that dispersal mechanisms play a role in bed maintenance and increased genetic diversity.

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Genetic structure and gene flow of eelgrass Zostera marina populations in Tokyo Bay, Japan: implications for their restoration

Cited by 33 publications

References 50 publications

Contribution of genetics to ecological restoration

Contribution of genetics to ecological restoration

Seeds in motion: Genetic assignment and hydrodynamic models demonstrate concordant patterns of seagrass dispersal

Seed dispersal in the seagrass Zostera marina is mostly within the parent bed in a protected bay

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