Global physical controls on estuarine habitat distribution during sea level change: Consequences for genetic diversification through time

Dolby, Greer A.; Bedolla, Arturo M.; Bennett, Scott; Jacobs, David K.

doi:10.1016/j.gloplacha.2020.103128

Cited by 14 publications

(23 citation statements)

References 121 publications

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“…(f) An SEMM of how habitat heterogeneity (Rahbek, Borregaard, Antonelli, et al, 2019), fuelled by soil/lithosphere patchiness, could lead to genetic divergence through differential adaptation. This mechanism is comparable to population isolation due to the patchiness of marginal marine habitat caused by heterogeneous morphology of continental shelves (Dolby et al, 2020), which is expected to produce more nonadaptive divergence. Blue denotes marine processes and pink denotes terrestrial processes.…”

Section: Applying Causal Structuresmentioning

confidence: 95%

“…Another SEMM (Figure 6f ) contextualizes this idea to formalize patchiness of abiotic conditions as another phenomenon that links terrestrial and marine systems. In marginal marine environments, work has shown that the steepness of continental shelves can restrict and isolate habitat types, leading to isolation of habitat patches, population divergence and potentially high richness (Dolby et al, 2018 , 2020 ) as well as demographic changes (Stiller et al, 2020 ). By drawing this SEMM we again see that patchiness of minerals (due to lithological heterogeneity) or patchiness of land steepness are conceptually related.…”

Section: Imagining Causality For Earth–life Sciencementioning

confidence: 99%

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Towards a unified framework to study causality in Earth–life systems

Dolby

2021

Molecular Ecology

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There is considerable interest in better understanding how earth processes shape the generation and distribution of life on Earth. This question, at its heart, is one of causation. In this article I propose that at a regional level, earth processes can be thought of as behaving somewhat deterministically and may have an organized effect on the diversification and distribution of species. However, the study of how landscape features shape biology is challenged by pseudocongruent or collinear variables. I demonstrate that causal structures can be used to depict the cause–effect relationships between earth processes and biological patterns using recent examples from the literature about speciation and species richness in montane settings. This application shows that causal diagrams can be used to better decipher the details of causal relationships by motivating new hypotheses. Additionally, the abstraction of this knowledge into structural equation metamodels can be used to formulate theory about relationships within Earth–life systems more broadly. Causal structures are a natural point of collaboration between biologists and Earth scientists, and their use can mitigate against the risk of misassigning causality within studies. My goal is that by applying causal theory through application of causal structures, we can build a systems‐level understanding of what landscape features or earth processes most shape the distribution and diversification of species, what types of organisms are most affected, and why.

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Section: Applying Causal Structuresmentioning

confidence: 95%

Section: Imagining Causality For Earth–life Sciencementioning

confidence: 99%

Towards a unified framework to study causality in Earth–life systems

Dolby

2021

Molecular Ecology

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Section: The Land‐sea Interface Is Particularly Vulnerable To Disturb...mentioning

confidence: 99%

“…The boundaries of coastal ecosystem units are controlled by tectonic, sedimentary, and sea‐level processes, and forces arising from changing waves and current regimes (Dolby et al, 2020; Ray, 2005). Tectonic and sea‐level processes can modify the geomorphic properties of continental shelves, and those properties, in turn, restrict ecosystem boundary conditions and control where different types of coastal habitats can form (Algeo & Wilkinson, 1991; Dolby et al, 2020; Parvizi et al, 2019; Ray, 2005). External oceanic and atmospheric forces including storms and hurricanes, on the other hand, can profoundly affect the distribution range and dispersal patterns of taxa, change the structure and diversity of communities, and potentially contribute to the emergence of novel coastal ecosystems and dispersal of exotic species to coastal areas around the globe (Doney et al, 2012; Fraser, Morrison, et al, 2018; Smith et al, 1999).…”

Section: The Land‐sea Interface Is Particularly Vulnerable To Disturb...mentioning

confidence: 99%

Genetic impacts of physical disturbance processes in coastal marine ecosystems

Parvizi

Fraser

Waters

2022

Journal of Biogeography

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Aim Coastal habitats are among the most dynamic environments on earth and are highly vulnerable to large‐scale physical disturbance. Genetic studies of nearshore marine species are revealing long‐lasting signatures of major coastal disturbance events. We synthesize emerging data to highlight how physical perturbations can impact the phylogeographic patterns of coastal populations. Taxon Coastal marine and estuarine taxa. Location Coastal regions around the globe. Methods We synthesize coastal genetic and genomic literature, focussing particularly on the phylogeographic consequences of natural disturbance events including uplift, tsunami, hurricanes, glaciations and sea‐level fluctuations. We focus on studies with clear physical analytical frameworks constrained by abiotic data. Results Tectonic and atmospheric disruptions can be considered shot‐term events with major impacts on populations adjacent to the centre of disturbance, typically resulting in the evolution of shallow phylogeographic patterns. Long‐lived climate‐driven disturbances such as glaciations, however, operate over vast geographic scales and often drive deep evolutionary patterns in affected populations. We show that studies using genome‐wide data could better identify fine‐scale signatures of both past and contemporary habitat perturbations. Conclusions Recent data reveal the interplay between physical upheaval and coastal phylogeography, indicating that disturbance can affect diversity, connectivity and demography of coastal populations. The interplay between long‐lived large‐scale disturbance and species‐specific biotic traits has shaped deep phylogeographic patterns of coastal taxa. Additionally, it could be argued that, at least for some regions, short‐term disturbance is the ‘rule’ rather than the ‘exception’, and thus, represents a key driver of coastal genetic patterns in disturbance prone coastal regions. Geo‐genomic approaches that combine genome‐wide data with explicit habitat models or disturbance history information have been particularly successful in explaining the drivers of coastal evolutionary change. We argue that future integration of genomic and physical data will be crucial for tracing evolutionary trends in fast‐changing marine environments.

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“…These species probably traced their preferred shallow sunlit bottoms when sea levels rose after the LGM and experienced different postglacial histories depending on their location on the coast. On the narrow western margin, populations are expected to be more differentiated due to greater patchiness of habitat (Dolby et al., 2020) than on wide margins such as the central bays. On the other hand, because the extent of habitat remained relatively stable on narrow shelves (Dolby et al., 2020), demographic changes may be less pronounced compared to populations on wide margins, which have gained large amounts of habitat.…”

Section: Introductionmentioning

confidence: 99%

Using ultraconserved elements to track the influence of sea‐level change on leafy seadragon populations

et al. 2020

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During the Last Glacial Maximum (LGM), global sea levels were 120–130 m lower than today, resulting in the emergence of most continental shelves and extirpation of subtidal organisms from these areas. During the interglacial periods, rapid inundation of shelf regions created a dynamic environment for coastal organisms, such as the charismatic leafy seadragon (Phycodurus eques, Syngnathidae), a brooder with low dispersal ability inhabiting kelp beds in temperate Australia. Reconstructions of the palaeoshoreline revealed that the increase of shallow areas since the LGM was not uniform across the species' range and we investigated the effects of these asymmetries on genetic diversity and structuring. Using targeted capture of 857 variable ultraconserved elements (UCEs, 2,845 single nucleotide polymorphisms) in 68 individuals, we found that the regionally different shelf topographies were paralleled by contrasting population genetic patterns. In the west, populations may not have persisted through sea‐level lows because shallow seabed was very limited. Shallow genetic structure, weak expansion signals and a westward cline in genetic diversity indicate a postglacial recolonization of the western part of the range from a more eastern location following sea‐level rise. In the east, shallow seabed persisted during the LGM and increased considerably after the flooding of large bays, which resulted in strong demographic expansions, deeper genetic structure and higher genetic diversity. This study suggests that postglacial flooding with rising sea levels produced locally variable signatures in colonizing populations.

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Global physical controls on estuarine habitat distribution during sea level change: Consequences for genetic diversification through time

Cited by 14 publications

References 121 publications

Towards a unified framework to study causality in Earth–life systems

Towards a unified framework to study causality in Earth–life systems

Genetic impacts of physical disturbance processes in coastal marine ecosystems

Using ultraconserved elements to track the influence of sea‐level change on leafy seadragon populations

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