An abrupt decline in springtime zooplankton diel vertical migration due to a shift in stratification regime

Jay A. Austin; Thomas R. Hrabik; Donn Branstrator

doi:10.1016/j.jglr.2022.03.011

An abrupt decline in springtime zooplankton diel vertical migration due to a shift in stratification regime

Jay A. Austin, Thomas R. Hrabik, Donn Branstrator

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

Returned signal strength intensity measurements from an acoustic Doppler current profiler deployed at an open-water site in Lake Superior from May-July 2019 were used to estimate the scattering intensity over the top 50 m of the water column. It displayed a strong diel signal, with higher scattering intensity at night, consistent with the normal diel vertical migration of planktonic organisms. However, the intensity of the nocturnal scattering signal decreased abruptly on 10 June, coincident with the end of winter stratification (cold water on top of warmer water) and the beginning of the neutrally stratified period. We hypothesize that the sudden change in zooplankton behavior is due the availability of phytoplankton deep in the water column after the transition, made possible by radiatively driven convection mixing the entire water column on time scales of hours.

Original language	English (US)
Pages (from-to)	837-842
Number of pages	6
Journal	Journal of Great Lakes Research
Volume	48
Issue number	3
DOIs	https://doi.org/10.1016/j.jglr.2022.03.011
State	Published - Jun 2022

Bibliographical note

Funding Information:
Funding for the fieldwork was provided by NSF OCE-1829895. The authors would like to thank Samuel Kelly for the use of the Nortek Signature 500 ADCP. JA collected the data, performed the analysis and initial interpretation, and wrote the bulk of the manuscript. TH contributed to concepts, interpretation of data and sections of writing. DB contributed to interpretation of data, writing, and editing. The authors would like to thank two anonymous reviewers for constructive criticism of our first draft. All data and code necessary to recreate results in this manuscript are available at the Data Repository at the University of Minnesota (DRUM) at https://doi.org/10.13020/eqra-hp74

Funding Information:
Funding for the fieldwork was provided by NSF OCE-1829895. The authors would like to thank Samuel Kelly for the use of the Nortek Signature 500 ADCP.

Publisher Copyright:
© 2022 International Association for Great Lakes Research

Keywords

Convection
Thermal structure
Zooplankton

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10.1016/j.jglr.2022.03.011

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title = "An abrupt decline in springtime zooplankton diel vertical migration due to a shift in stratification regime",

abstract = "Returned signal strength intensity measurements from an acoustic Doppler current profiler deployed at an open-water site in Lake Superior from May-July 2019 were used to estimate the scattering intensity over the top 50 m of the water column. It displayed a strong diel signal, with higher scattering intensity at night, consistent with the normal diel vertical migration of planktonic organisms. However, the intensity of the nocturnal scattering signal decreased abruptly on 10 June, coincident with the end of winter stratification (cold water on top of warmer water) and the beginning of the neutrally stratified period. We hypothesize that the sudden change in zooplankton behavior is due the availability of phytoplankton deep in the water column after the transition, made possible by radiatively driven convection mixing the entire water column on time scales of hours.",

keywords = "Convection, Thermal structure, Zooplankton",

author = "Austin, {Jay A.} and Hrabik, {Thomas R.} and Donn Branstrator",

note = "Funding Information: Funding for the fieldwork was provided by NSF OCE-1829895. The authors would like to thank Samuel Kelly for the use of the Nortek Signature 500 ADCP. JA collected the data, performed the analysis and initial interpretation, and wrote the bulk of the manuscript. TH contributed to concepts, interpretation of data and sections of writing. DB contributed to interpretation of data, writing, and editing. The authors would like to thank two anonymous reviewers for constructive criticism of our first draft. All data and code necessary to recreate results in this manuscript are available at the Data Repository at the University of Minnesota (DRUM) at https://doi.org/10.13020/eqra-hp74 Funding Information: Funding for the fieldwork was provided by NSF OCE-1829895. The authors would like to thank Samuel Kelly for the use of the Nortek Signature 500 ADCP. Publisher Copyright: {\textcopyright} 2022 International Association for Great Lakes Research",

year = "2022",

month = jun,

doi = "10.1016/j.jglr.2022.03.011",

language = "English (US)",

volume = "48",

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journal = "Journal of Great Lakes Research",

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AU - Austin, Jay A.

AU - Hrabik, Thomas R.

AU - Branstrator, Donn

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PY - 2022/6

Y1 - 2022/6

N2 - Returned signal strength intensity measurements from an acoustic Doppler current profiler deployed at an open-water site in Lake Superior from May-July 2019 were used to estimate the scattering intensity over the top 50 m of the water column. It displayed a strong diel signal, with higher scattering intensity at night, consistent with the normal diel vertical migration of planktonic organisms. However, the intensity of the nocturnal scattering signal decreased abruptly on 10 June, coincident with the end of winter stratification (cold water on top of warmer water) and the beginning of the neutrally stratified period. We hypothesize that the sudden change in zooplankton behavior is due the availability of phytoplankton deep in the water column after the transition, made possible by radiatively driven convection mixing the entire water column on time scales of hours.

AB - Returned signal strength intensity measurements from an acoustic Doppler current profiler deployed at an open-water site in Lake Superior from May-July 2019 were used to estimate the scattering intensity over the top 50 m of the water column. It displayed a strong diel signal, with higher scattering intensity at night, consistent with the normal diel vertical migration of planktonic organisms. However, the intensity of the nocturnal scattering signal decreased abruptly on 10 June, coincident with the end of winter stratification (cold water on top of warmer water) and the beginning of the neutrally stratified period. We hypothesize that the sudden change in zooplankton behavior is due the availability of phytoplankton deep in the water column after the transition, made possible by radiatively driven convection mixing the entire water column on time scales of hours.

KW - Convection

KW - Thermal structure

KW - Zooplankton

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An abrupt decline in springtime zooplankton diel vertical migration due to a shift in stratification regime

Abstract

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