Outram Dawn

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Outram
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Dawn
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Article

Ocean deoxygenation and zooplankton: Very small oxygen differences matter

2018-12-19 , Wishner, Karen F. , Seibel, Brad A. , Roman, Chris , Deutsch, Curtis , Outram, Dawn , Shaw, C. Tracy , Birk, Matthew A. , Mislan, K. A. S. , Adams, T. J. , Moore, D. , Riley, S.

Oxygen minimum zones (OMZs), large midwater regions of very low oxygen, are expected to expand as a result of climate change. While oxygen is known to be important in structuring midwater ecosystems, a precise and mechanistic understanding of the effects of oxygen on zooplankton is lacking. Zooplankton are important components of midwater food webs and biogeochemical cycles. Here, we show that, in the eastern tropical North Pacific OMZ, previously undescribed submesoscale oxygen variability has a direct effect on the distribution of many major zooplankton groups. Despite extraordinary hypoxia tolerance, many zooplankton live near their physiological limits and respond to slight (≤1%) changes in oxygen. Ocean oxygen loss (deoxygenation) may, thus, elicit major unanticipated changes to midwater ecosystem structure and function.

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Dataset

Abundances of copepod species in each net from MOCNESS tows in the Eastern Tropical North Pacific collected on four research cruises from 2007-2017

2021-07-28 , Wishner, Karen , Outram, Dawn , Seibel, Brad , Roman, Christopher

This dataset includes abundances of copepod species in each net from MOCNESS tows in the Eastern Tropical North Pacific collected on four research cruises (KN195-02, OC1604B, SJ07, and SKQ201701S) from 2007-2017. Data are from vertically-stratified MOCNESS tows (8 or 9 nets per tow) through and within the Oxygen Minimum Zone (OMZ). Tows sampled various depth ranges between 1200 m to the surface and included paired day and night tows for many strata. Abundances for each species were calculated for each net after accounting for split size and volume filtered and are reported as numbers per 1000 cubic meters of water filtered. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/855395