Gareth A. Pearson

University of Algarve

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Ester Á. Serrão

University of Algarve

118

João Neiva

University of Algarve

Jorge Assis

University of Algarve

Myriam Valéro

Station Biologique de Roscoff

Neusa Martins

University of Algarve

Katy R. Nicastro

Laboratoire d’Océanologie et de Géosciences

Jørn Olsen

University of Groningen

Gerardo I. Zardi

Rhodes University

Inka Bartsch

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

Nelson Castilho Coelho

University of Algarve

Cooperative Institutions

University of Algarve

101

Centre National de la Recherche Scientifique

University of Lisbon

Universidade do Porto

Sorbonne Université

Centro de Ciências do Mar do Algarve

Station Biologique de Roscoff

Consejo Superior de Investigaciones Científicas

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

University of Groningen

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Author Correction: Long range gene flow beyond predictions from oceanographic transport in a tropical marine foundation species

Scientific Reports (2023)

Ana I. Tavares Jorge Assis Patrick D. Larkin Joel C. Creed Karine Matos Magalhães

Fine scale connectivity' , "Sea turtles and dugongs are known to feed on H. wrightii meadows in these regions 63 , and for some species, these areas are part of their migratory pathways 64 .

Foundation (evidence)

Tropical marine climate

10.1038/s41598-023-37583-2

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Citations (0)

Rice as a Crop for Salt-Affected Soil in Process of Reclamation

Gareth A. Pearson A. D. Ayers

Source

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Citations (20)

Not out of the Mediterranean: Atlantic populations of the gorgonian Paramuricea clavata are a separate sister species under further lineage diversification

Authorea (Authorea) (2022)

Márcio A. G. Coelho Gareth A. Pearson Joana Boavida Diogo Paulo Didier Aurelle

The accurate delimitation of species boundaries in non-bilaterian marine taxa is notoriously difficult, with consequences for many studies in ecology and evolution. Anthozoans are a diverse group of key structural organisms worldwide, but the lack of reliable morphological characters and informative genetic markers hampers our ability to understand species diversification. We investigated population differentiation and species limits in Atlantic (Iberian Peninsula) and Mediterranean lineages of the octocoral genus Paramuricea previously identified as P. clavata. We used a diverse set of molecular markers (microsatellites, RNA-seq derived single-copy orthologues [SCO] and mt-mutS [mitochondria]) at 49 locations. Clear segregation of Atlantic and Mediterranean lineages was found with all markers. Species-tree estimations based on SCO strongly supported these two clades as distinct, recently diverged sister species with incomplete lineage sorting, P. cf. grayi and P. clavata, respectively. Furthermore, a second putative (or ongoing) speciation event was detected in the Atlantic between two P. cf. grayi colour morphotypes (yellow and purple) using SCO and supported by microsatellites. While segregating P. cf. grayi lineages showed considerable geographic structure, dominating circalittoral communities in southern (yellow) and western (purple) Portugal, their occurrence in sympatry at some localities suggests a degree of reproductive isolation. Overall, our results show that previous molecular and morphological studies have underestimated species diversity in Paramuricea occurring in the Iberian Peninsula, which has important implications for conservation planning. Finally, our findings validate the usefulness of phylotranscriptomics for resolving evolutionary relationships in octocorals.

Lineage (genetic)

Sister group

Reproductive isolation

10.22541/au.165544523.32209087/v1

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Citations (2)

Freezing rate and duration determine the physiological response of intertidal fucoids to freezing

Marine Biology (1993)

Gareth A. Pearson I. R. Davison

Ascophyllum

Rocky shore

Respiration rate

10.1007/bf00349832

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Citations (25)

Heat stress responses and population genetics of the kelp Laminaria digitata (Phaeophyceae) across latitudes reveal differentiation among North Atlantic populations

Ecology and Evolution (2020)

Daniel Liesner Louise Fouqueau Myriam Valéro Michael Y. Roleda Gareth A. Pearson

Abstract To understand the thermal plasticity of a coastal foundation species across its latitudinal distribution, we assess physiological responses to high temperature stress in the kelp Laminaria digitata in combination with population genetic characteristics and relate heat resilience to genetic features and phylogeography. We hypothesize that populations from Arctic and cold‐temperate locations are less heat resilient than populations from warm distributional edges. Using meristems of natural L. digitata populations from six locations ranging between Kongsfjorden, Spitsbergen (79°N), and Quiberon, France (47°N), we performed a common‐garden heat stress experiment applying 15°C to 23°C over eight days. We assessed growth, photosynthetic quantum yield, carbon and nitrogen storage, and xanthophyll pigment contents as response traits. Population connectivity and genetic diversity were analyzed with microsatellite markers. Results from the heat stress experiment suggest that the upper temperature limit of L. digitata is nearly identical across its distribution range, but subtle differences in growth and stress responses were revealed for three populations from the species’ ecological range margins. Two populations at the species’ warm distribution limit showed higher temperature tolerance compared to other populations in growth at 19°C and recovery from 21°C (Quiberon, France), and photosynthetic quantum yield and xanthophyll pigment responses at 23°C (Helgoland, Germany). In L. digitata from the northernmost population (Spitsbergen, Norway), quantum yield indicated the highest heat sensitivity. Microsatellite genotyping revealed all sampled populations to be genetically distinct, with a strong hierarchical structure between southern and northern clades. Genetic diversity was lowest in the isolated population of the North Sea island of Helgoland and highest in Roscoff in the English Channel. All together, these results support the hypothesis of moderate local differentiation across L. digitata's European distribution, whereas effects are likely too weak to ameliorate the species’ capacity to withstand ocean warming and marine heatwaves at the southern range edge.

Laminaria digitata

Population Genetics

10.1002/ece3.6569

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Citations (50)

Some Observations on the Reaction of Pine Seedlings to Shade

Ecology (1936)

Gareth A. Pearson

10.2307/1931467

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Citations (15)

The response of tractor draught controls to random variations in draught

Journal of Agricultural Engineering Research (1975)

D.A. Crolla Gareth A. Pearson

Tractor

Plough

10.1016/0021-8634(75)90085-2

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Citations (16)

Lighter Cuts and Larger Yields in Ponderosa Pine

Journal of Forestry (1938)

Gareth A. Pearson

10.1093/jof/36.8.779

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Citations (3)

Population level variation in reproductive development and output in the golden kelp Laminaria ochroleuca under marine heat wave scenarios

Frontiers in Marine Science (2022)

Fiona-Elaine Strasser L Barreto Soukaina Kaidi Brahim Sabour Ester Á. Serrão

Thermal tolerance is often interpreted as a species-wide thermal niche in the absence of studies focusing on the adaptive potential of populations to exhibit differential thermal tolerance. Thus, considering intraspecific thermal plasticity, local adaptation or both between populations along distributional gradients when interpreting and predicting species responses to warming is imperative. Removing the effect of environmental histories by raising kelp gametophyte generations in vitro under common garden conditions allows unbiased comparison between population-specific adaptive variation under different environmental conditions. Following this approach, this study aims to detect (potentially) adaptive differentiation in microscopic life-stages (gametophytes) between populations of a temperate forest forming kelp, Laminaria ochroleuca from locations with distinct thermal conditions. Gametophytes from four geographically distinct populations were subjected to different temperature treatments (17, marine heat waves of 23, 25 and 27°C) and gametophyte survival during thermal stress as well as reproductive success and photosynthetic responses during recovery were investigated. Intraspecific variation in resilience and reproductive output to thermal stress was found in L. ochroleuca ; gametophytes from the most northern population (Brittany, France) were the most thermally sensitive, with mortality onset at 23°C, whereas mortality in the remaining populations was only apparent at 27°C. Gametophytes from northern Spain and Morocco exhibited very low reproductive success during recovery from 23 and 25°C. However, when recovering from the highest thermal treatment (27°C) the reproductive development and sporophyte output was higher than in the gametophytes from France and Italy (Mediterranean). The population-specific responses of gametophyte resilience and reproductive success to temperature stress suggest genetic differentiation in response to variation in local thermal regimes.

Sporophyte

10.3389/fmars.2022.943511

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Citations (5)

Genes Left Behind: Climate Change Threatens Cryptic Genetic Diversity in the Canopy-Forming Seaweed Bifurcaria bifurcata

PLoS ONE (2015)

João Neiva Jorge Assis Nelson Castilho Coelho Francisco Fernandes Gareth A. Pearson

The global redistribution of biodiversity will intensify in the coming decades of climate change, making projections of species range shifts and of associated genetic losses important components of conservation planning. Highly-structured marine species, notably brown seaweeds, often harbor unique genetic variation at warmer low-latitude rear edges and thus are of particular concern. Here, a combination of Ecological Niche Models (ENMs) and molecular data is used to forecast the potential near-future impacts of climate change for a warm-temperate, canopy forming seaweed, Bifurcaria bifurcata. ENMs for B. bifurcata were developed using marine and terrestrial climatic variables, and its range projected for 2040-50 and 2090-2100 under two greenhouse emission scenarios. Geographical patterns of genetic diversity were assessed by screening 18 populations spawning the entire distribution for two organelle genes and 6 microsatellite markers. The southern limit of B. bifurcata was predicted to shift northwards to central Morocco by the mid-century. By 2090-2100, depending on the emission scenario, it could either retreat further north to western Iberia or be relocated back to Western Sahara. At the opposing margin, B. bifurcata was predicted to expand its range to Scotland or even Norway. Microsatellite diversity and endemism were highest in Morocco, where a unique and very restricted lineage was also identified. Our results imply that B. bifurcata will maintain a relatively broad latitudinal distribution. Although its persistence is not threatened, the predicted extirpation of a unique southern lineage or even the entire Moroccan diversity hotspot will erase a rich evolutionary legacy and shrink global diversity to current (low) European levels. NW Africa and similarly understudied southern regions should receive added attention if expected range changes and diversity loss of warm-temperate species is not to occur unnoticed.

Environmental niche modelling

Endemism

Lineage (genetic)

Biodiversity hotspot

10.1371/journal.pone.0131530

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Citations (49)