Metazoan Diversity and Its Drivers: An eDNA Survey in the Pacific Gateway of a Changing Arctic Ocean DOI Creative Commons
Gerlien Verhaegen, Tatsuya Kawakami, Ayla Murray

et al.

Environmental DNA, Journal Year: 2025, Volume and Issue: 7(2)

Published: March 1, 2025

ABSTRACT Climate change drives species to adapt or undergo range shifts survive. The Arctic Ocean, experiencing more drastic environmental changes than any other ocean, has two primary inflow regions that facilitate these shifts: the wide, deep Atlantic Gateway and narrow, shallow Pacific Gateway. Environmental DNA (eDNA) surveys have proven be effective in characterizing community composition understanding its ecological drivers. We conducted first COI marker‐based eDNA survey analyzed seawater samples from various geographic regions, depths, water masses across Bering Strait, Chukchi Sea, South Beaufort Sea. Metazoan taxa 15 different phyla indicator for were identified. characterized a highly diverse neritic fauna Strait aligning with known locations of benthic hotspots. On slope we observed transitions copepod‐dominated epipelagic waters cnidarian‐ sponge‐dominated deeper areas. Alpha diversity peaked near seabed coastlines was highest within warmest Alaskan Coastal Water mass. linked metazoan communities variables, being associated higher temperatures fluorescence, majority them lower salinities. This included mostly Pseudocalanus copepod verongiid sponges. While rising might enhance alpha diversity, anticipate this will primarily due influx warmer fresher masses. Several taxa, including bivalve Macoma calcarea seastar Leptasterias arctica , as well jellyfish Chrysaora melanaster Triconia borealis colder, saltier likely negatively impacted by ongoing change. Our study successfully rapidly changing Ocean.

Language: Английский

Shotgun metagenomics reveals the flexibility and diversity of Arctic marine microbiomes DOI Creative Commons
Nastasia J. Freyria, Thais Campos de Oliveira, Arnaud Meng

et al.

ISME Communications, Journal Year: 2025, Volume and Issue: 5(1)

Published: Jan. 1, 2025

Abstract Polar oceanographic regions are exposed to rapid changes in temperature, salinity, and light fields that determine microbial species distributions, but resilience an increasingly unstable climate is unknown. To unravel genomic potential of the Northern Baffin Bay’s polynya, we constructed eight metagenomes from same latitude targeting two sides Pikialasorsuaq (The North Water) differ by current systems, stratification, temperature regimes. Samples surface subsurface chlorophyll maximum (SCM) both were collected 13 months apart. Details metabolic pathways determined for 18 bacteria 10 eukaryote metagenome-assembled genomes (MAGs). The eukaryotic MAGs associated with dominant green algae Mamiellales diatoms Mediophyceae, which tended respectively dominate eastern western Pikialasorsuaq. We show community taxonomic functional signatures ca. 80% similar at sampled only 20% genes local conditions. From found involved osmotic regulation, antifreeze proteins, photosystem protection, hydrocarbon biodegradation methane oxidation detected. shared compliment was consistent adaptation Arctic’s extreme fluctuating conditions, implications their evolutionary history long-term survival a pan-arctic microbiome. In particular, previously unrecognized genetic capabilities bio-attenuation metabolism phytoplankton suggest dark conditions will remain, despite warming, high offshore waters future Arctic.

Language: Английский

Citations

0
Metazoan Diversity and Its Drivers: An eDNA Survey in the Pacific Gateway of a Changing Arctic Ocean DOI Creative Commons
Gerlien Verhaegen, Tatsuya Kawakami, Ayla Murray

et al.

Environmental DNA, Journal Year: 2025, Volume and Issue: 7(2)

Published: March 1, 2025

ABSTRACT Climate change drives species to adapt or undergo range shifts survive. The Arctic Ocean, experiencing more drastic environmental changes than any other ocean, has two primary inflow regions that facilitate these shifts: the wide, deep Atlantic Gateway and narrow, shallow Pacific Gateway. Environmental DNA (eDNA) surveys have proven be effective in characterizing community composition understanding its ecological drivers. We conducted first COI marker‐based eDNA survey analyzed seawater samples from various geographic regions, depths, water masses across Bering Strait, Chukchi Sea, South Beaufort Sea. Metazoan taxa 15 different phyla indicator for were identified. characterized a highly diverse neritic fauna Strait aligning with known locations of benthic hotspots. On slope we observed transitions copepod‐dominated epipelagic waters cnidarian‐ sponge‐dominated deeper areas. Alpha diversity peaked near seabed coastlines was highest within warmest Alaskan Coastal Water mass. linked metazoan communities variables, being associated higher temperatures fluorescence, majority them lower salinities. This included mostly Pseudocalanus copepod verongiid sponges. While rising might enhance alpha diversity, anticipate this will primarily due influx warmer fresher masses. Several taxa, including bivalve Macoma calcarea seastar Leptasterias arctica , as well jellyfish Chrysaora melanaster Triconia borealis colder, saltier likely negatively impacted by ongoing change. Our study successfully rapidly changing Ocean.

Language: Английский

Citations

0