Variation in genomic vulnerability to climate change across temperate populations of eelgrass (Zostera marina)

Authorea (Authorea), Journal Year: 2023, Volume and Issue: unknown

Published: Jan. 5, 2023

A global decline in seagrass populations has led to renewed calls for their conservation as important providers of biogenic and foraging habitat, shoreline stabilisation, carbon storage. Eelgrass (Zostera marina) occupies the largest geographic range among species spanning a commensurately broad spectrum environmental conditions. However, relatively little is known about fine-scale genetic structure broad-scale genomic signatures adaptation, Canada, eelgrass considered single phylogroup despite occurring across three oceans. We used pooled whole-genome re-sequencing approach characterise population structure, gene flow, adaptation 23 ranging from Northeast United States, Atlantic, subarctic, Pacific Canada. identified over 500,000 SNPs, which when mapped chromosome-level genome assembly revealed six clades study area, with pairwise FST 0 neighbouring 0.54 between Atlantic coasts. Genetic diversity was highest lowest Arctic, consistent colonisation Arctic oceans Pacific. Using redundancy analyses two climate change projection scenarios, we found that subarctic are more vulnerable through offset predictions. Conservation planning Canada should ensure representative each clade included within national network so latent protected, flow maintained. Northern populations, particular, may require stronger protective measures given susceptibility climate.

Language: Английский

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Variation in genomic vulnerability to climate change across temperate populations of eelgrass (Zostera marina)

Authorea (Authorea), Journal Year: 2023, Volume and Issue: unknown

Published: Jan. 18, 2023

A global decline in seagrass populations has led to renewed calls for their conservation as important providers of biogenic and foraging habitat, shoreline stabilisation, carbon storage. Eelgrass (Zostera marina) occupies the largest geographic range among species spanning a commensurately broad spectrum environmental conditions. However, relatively little is known about fine-scale genetic structure broad-scale genomic signatures adaptation, Canada, eelgrass considered single phylogroup despite occurring across three oceans. We used pooled whole-genome re-sequencing approach characterise population structure, gene flow, adaptation 23 ranging from Northeast United States, Atlantic, subarctic, Pacific Canada. identified over 500,000 SNPs, which when mapped chromosome-level genome assembly revealed six clades study area, with pairwise FST 0 neighbouring 0.54 between Atlantic coasts. Genetic diversity was highest lowest Arctic, consistent colonisation Arctic oceans Pacific. Using redundancy analyses two climate change projection scenarios, we found that subarctic are more vulnerable through offset predictions. Conservation planning Canada should ensure representative each clade included within national network so latent protected, flow maintained. Northern populations, particular, may require stronger protective measures given susceptibility climate.

Language: Английский

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Larger distribution ranges of seagrasses towards the equator

Journal of Biogeography, Journal Year: 2023, Volume and Issue: 51(3), P. 350 - 355

Published: Nov. 16, 2023

Abstract Aim The description of species' ranges provides biogeographical information to explain fundamental macroecological and evolutionary processes. In this study, we investigated the Rapoport's rule for world's seagrasses, that is, whether range extent seagrasses increases from tropics poles. Location Global. Taxon Seagrasses. Methods We examined four geographical metrics: latitudinal longitudinal ranges, total distribution area (Km 2 ) number marine ecoregions encompassed by seagrass species, changed according their midpoints. Results Seagrasses have larger as indicated all metrics, close equator in both hemispheres, supporting inverse pattern. Main Conclusions towards equatorial regions may be attributed origins during warm geologic periods, subsequent longer climatic stability tropical areas leading climate niche conservatism constraining evolution.

Language: Английский

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Population genetic patterns across the native and invasive range of a widely distributed seagrass: Phylogeographic structure, invasive history and conservation implications

Diversity and Distributions, Journal Year: 2023, Volume and Issue: 30(3)

Published: Dec. 25, 2023

Abstract Aim The seagrass Zostera japonica is a dramatically declined endemic species in the Northwestern Pacific from (sub)tropical to temperate areas, however, it also an introduced along coast of North America British Columbia northern California. Understanding population's genetic patterns can inform conservation and management this species. Location Pacific. Methods We used sequences nuclear rDNA internal transcribed spacer (ITS) chloroplast trn K intron maturase ( matK ), 24 microsatellite loci survey 34 native nonnative populations (>1000 individuals) Z. throughout entire biogeographic range. analysed phylogeographic relationship, population structure diversity all inferred possible origins invasion pathways ones. Results All markers revealed surprising significant deep divergence between southern region separated by well‐established biogeographical boundary. A secondary contact zone was found coasts South Korea Japan. Nonnative were originate central Japan with multiple introductions at least two different source populations, spread likely aided waterfowl. Main Conclusions distinct clades due combined effects historical isolation, adaptation environments contemporary physical barrier created Yangtze River, warm northward Kuroshio Current led after glacial separation. Existing exchanges among indicate potential for persistence further expansion. This study not only helps understand underlying evolutionary widespread following global climate change but provides valuable insights restoration.

Language: Английский

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Ocean currents drive the worldwide colonization of the most widespread marine plant, eelgrass (Zostera marina)

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2022, Volume and Issue: unknown

Published: Dec. 10, 2022

Abstract Currents are unique drivers of oceanic phylogeography and so determine the distribution marine coastal species, along with past glaciations sea level changes. Here, we reconstruct worldwide colonization history eelgrass ( Zostera marina L.), most widely distributed flowering plant or seagrass from its origin in Northwest Pacific, based on nuclear chloroplast genomes. We identified two divergent Pacific clades evidence for admixture East coast. Multiple west to east (trans-Pacific) events support key role North Current. Time-calibrated phylogenies yielded concordant estimates arrival Z. Atlantic through Canadian Arctic, suggesting that eelgrass-based ecosystems, hotspots biodiversity carbon sequestration, have only been present since ∼208 Kya (thousand years ago). Mediterranean populations were founded ∼53 while extant distributions western eastern shores coincide end Last Glacial Maximum (∼20 Kya). The recent 5-to 7-fold lower genomic diversity compared raises concern opportunity about how might respond rapidly warming oceans.

Language: Английский

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