AI Article Synopsis

  • The study addresses the lack of data on mesopelagic zooplankton diversity and community composition in the northeast Pacific Ocean, using DNA metabarcoding and trait-based analysis.
  • It investigates whether the North Pacific Transition Zone serves as a biogeographic boundary for these zooplankton, finding no clear boundary but noting increased community similarity in deeper waters.
  • Results indicate that species traits, particularly diel vertical migration behavior, significantly impact the distribution and environmental ranges of these zooplankton, influencing biogeographic patterns.

Article Abstract

Due to historical under-sampling of the deep ocean, the distributional ranges of mesopelagic zooplankton are not well documented, leading to uncertainty about the mechanisms that shape midwater zooplankton community composition. Using a combination of DNA metabarcoding (18S-V4 and mtCOI) and trait-based analysis, we characterized zooplankton diversity and community composition in the upper 1000 m of the northeast Pacific Ocean. We tested whether the North Pacific Transition Zone is a biogeographic boundary region for mesopelagic zooplankton. We also tested whether zooplankton taxa occupying different vertical habitats and exhibiting different ecological traits differed in the ranges of temperature, Chl-, and dissolved oxygen conditions inhabited. The depth of the maximum taxonomic richness deepened with increasing latitude in the North Pacific. Community similarity in the mesopelagic zone also increased in comparison with the epipelagic zone, and no evidence was found for a biogeographic boundary between previously delineated mesopelagic biogeochemical provinces. Epipelagic zooplankton exhibited broader temperature and Chl- ranges than mesopelagic taxa. Within the epipelagic, taxa with broader temperature and Chl- ranges also had broader distributional ranges. However, mesopelagic taxa were distributed across wider dissolved oxygen ranges, and within the mesopelagic, only oxygen ranges covaried with distributional ranges. Environmental and distributional ranges also varied among traits, both for epipelagic taxa and mesopelagic taxa. The strongest differences in both environmental and distributional ranges were observed for taxa with or without diel vertical migration behavior. Our results suggest that species traits can influence the differential effects of physical dispersal and environmental selection in shaping biogeographic distributions.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10625861PMC
http://dx.doi.org/10.1002/ece3.10664DOI Listing

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