A new Sargassum drift model derived from features tracking in MODIS images

Podlejski, Witold; Berline, Léo; Nérini, David; Doglioli, Andrea M.; Lett, Christophe

doi:10.1016/j.marpolbul.2023.114629

Cited by 14 publications

(5 citation statements)

References 44 publications

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“…Such submesoscale physical processes (McWilliams et al, 2016) have a crucial role in the trajectories of propagule dispersing for a few days (typically in-house dispersal, i.e., gamete, zygote and/or spore in macroalgae), possibly affecting local connectivity patterns (Saint-Amand et al, 2023, Ward et al, 2023. Similarly, uncertainty also remains in third-party dispersal, as we have not considered the effect of wind and waves on drift velocities of macroalgae rafts when simulating LDD (Podlejski et al, 2023). Dispersal capacity reported for marine forests is highly variable in the 13 literature, with a lack of species-specific information (i.e., we have insufficient material for 79 % of the species compiled in our dataset).…”

Section: Discussionmentioning

confidence: 99%

Unravelling the role of oceanographic connectivity in intra-specific diversity of marine forests at global scale

Legrand,

Fragkopoulou,

Vapillon

et al. 2023

Preprint

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Aim: Intra-specific diversity results from complex interactions of intermingled eco-evolutionary processes along species′ history, but their relative contribution has not been addressed at the global scale. Here, we unravel the role of present-day oceanographic connectivity in explaining the genetic differentiation of marine forests across the ocean. Location: Global. Time period: Contemporary. Major taxa studied: Marine forests of brown macroalgae (order Fucales, Ishigeales, Laminariales, Tilopteridale). Methods: Through systematic literature revision, we compiled a comprehensive dataset of genetic differentiation, encompassing 662 populations of 34 species. A biophysical model coupled with network analyses estimated multigenerational oceanographic connectivity and centrality across the marine forest global distribution. This approach integrated species′ dispersive capacity and long-distance dispersal events. Linear mixed models tested the relative contribution of site-specific processes, connectivity, and centrality in explaining genetic differentiation. Results: We show that spatiality dependent eco-evolutionary processes, as described by our models, are prominent drivers of genetic differentiation in marine forests (significant models in 92.6 % of the cases with an average R2of 0.49 ± 0.07). Specifically, we reveal that 19.6 % of variance is explicitly induced by contemporary connectivity and centrality. Moreover, we demonstrate that LDD is key in connecting populations of species distributed across large water masses and continents. Main conclusions: We deciphered the role of present-day connectivity in observed patterns of genetic differentiation of marine forests. Our findings significantly contribute to the understanding of the drivers of intra-specific diversity on a global scale, with implications for biogeography and evolution. These results can guide well-informed conservation efforts, including the designation of marine protected areas, as well as spatial planning for genetic diversity in aquaculture, which is particularly relevant for sessile ecosystems structuring species such as brown macroalgae.

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Section: Discussionmentioning

confidence: 99%

Unravelling the role of oceanographic connectivity in intra-specific diversity of marine forests at global scale

Legrand,

Fragkopoulou,

Vapillon

et al. 2023

Preprint

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“…These can be important for short-distance dispersal events (e.g., gametes, zygotes, spores), potentially influencing local connectivity patterns 45,46 . Similarly, uncertainty exists for long-distance dispersal events (e.g., rafting), as wind and wave effects on drift velocities were not explicitly considered, but can also be relevant in structuring dispersal pathways 47 . Second, the current velocity fields utilized in BM are restricted to the surface of the ocean, potentially underestimating connectivity of deep cryptic populations.…”

Section: Discussionmentioning

confidence: 99%

Oceanographic connectivity strongly restricts future range expansions of critical ecosystem structuring species

Assis,

Legrand,

Fragkopoulou

et al. 2024

Preprint

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Climate change is anticipated to profoundly shift the distribution of marine biodiversity, yet the extent to which species can track suitable habitats remains unknown. In particular, oceanographic connectivity, the exchange of individuals mediated by ocean currents, can play a crucial role in dispersal and future range dynamics. Here, we integrate species distribution models and biophysical models to quantify the extent to which oceanographic connectivity can restrict future range expansions of marine forests of seagrasses and brown macroalgae under contrasting climate change scenarios. Our results show substantial range contractions for both groups, particularly under high emissions. Despite the potential for broad poleward range expansions that could partially offset range constrictions, oceanographic connectivity emerges as a major limiting factor, restricting potential expansion areas of newly suitable habitats by up to 8-fold for seagrasses and by 6.7-fold for brown macroalgae. These restrictions may push up to 90% of species into experiencing negative net habitat changes. Notably, connectivity barriers are well-defined at the global scale, and particularly strong in regions projected to hold extensive future suitable habitat, including the Okhotsk Sea, New Zealand, and the Arctic. Overall, our findings emphasize the need for conservation and management strategies that explicitly integrate both changing habitat suitability and oceanographic connectivity to provide the most accurate and actionable guidance for protecting marine forests in a changing climate.

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“…gamete, zygote and/or spore in macroalgae), possibly affecting local connectivity patterns (Saint‐Amand et al., 2023; Ward et al., 2023). Similarly, uncertainty also remains in rafting dispersal, as we have not considered the effect of wind and waves on drift velocities of macroalgae rafts when simulating long‐distance dispersal (Podlejski et al., 2023). Dispersal capacity reported for marine forests is highly variable in the literature, with a lack of species‐specific information (i.e.…”

Section: Discussionmentioning

confidence: 99%

Unravelling the role of oceanographic connectivity in the distribution of genetic diversity of marine forests at the global scale

Legrand,

Fragkopoulou,

Vapillon

et al. 2024

Global Ecol Biogeogr

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AimGenetic diversity of marine forests results from complex interactions of eco‐evolutionary processes. Among them, oceanographic connectivity driven by dispersal through water transport is hypothesized to play a pivotal role, yet its relative contribution has not been addressed at the global scale. Here, we test how present‐day oceanographic connectivity is correlated with the distribution of genetic diversity of marine forests across the ocean.LocationGlobal.Time periodContemporary.Major taxa studiedMarine forests of brown macroalgae (order: Fucales, Ishigeales, Laminariales and Tilopteridales).MethodsThrough literature review, we compiled a comprehensive dataset of genetic differentiation, encompassing 699 populations of 30 species. A biophysical model coupled with network analyses estimated multigenerational oceanographic connectivity and centrality across the marine forest global distribution. This approach integrated propagule dispersive capacity and long‐distance dispersal events. Linear mixed models tested the relative contribution of site‐specific processes, connectivity and centrality in explaining genetic differentiation.ResultsWe show that spatiality‐dependent eco‐evolutionary processes, as described by our models, are prominent drivers of genetic differentiation in marine forests (significant models in 91.43% of the cases with an average R2 of 0.50 ± 0.07). Specifically, we reveal that 18.7% of genetic differentiation variance is explicitly induced by predicted contemporary connectivity and centrality. Moreover, we demonstrate that long‐distance dispersal is key in connecting populations of species distributed across large water masses and continents.Main conclusionsOur findings highlight the role of present‐day oceanographic connectivity in shaping the extant distribution of genetic diversity of marine forests on a global scale, with significant implications for biogeography and evolution. This understanding can pave the way for future research aimed at guiding conservation efforts, including the designation of well‐connected marine protected areas, which is particularly relevant for sessile ecosystems structuring species such as brown macroalgae.

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A new Sargassum drift model derived from features tracking in MODIS images

Cited by 14 publications

References 44 publications

Unravelling the role of oceanographic connectivity in intra-specific diversity of marine forests at global scale

Unravelling the role of oceanographic connectivity in intra-specific diversity of marine forests at global scale

Oceanographic connectivity strongly restricts future range expansions of critical ecosystem structuring species

Unravelling the role of oceanographic connectivity in the distribution of genetic diversity of marine forests at the global scale

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