Light sensitivity of the Arctic copepod Metridia longa during midnight sun and polar night
The Arctic is defined by a seasonal light regime extending between 24-hour light (Midnight Sun) and 24-hour dark (Polar Night). Light itself acts as an important cue for marine zooplankton, dictating their orientation/navigation and vertical migration, prey detection and predator avoidance, and popu...
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ftunivdelaware:oai:udspace.udel.edu:19716/33254 2023-11-12T04:09:40+01:00 Light sensitivity of the Arctic copepod Metridia longa during midnight sun and polar night Lightfoot, Meaghan 2023-06-29T19:07:58Z application/pdf https://udspace.udel.edu/handle/19716/33254 en eng University of Delaware https://login.udel.idm.oclc.org/login?url=https://www.proquest.com/dissertations-theses/light-sensitivity-arctic-copepod-em-metridia/docview/2833510862/se-2?accountid=10457 1402227018 https://udspace.udel.edu/handle/19716/33254 Arctic Irradiance response Metridia longa Midnight Sun Polar Night Spectral response Thesis 2023 ftunivdelaware 2023-10-15T16:49:01Z The Arctic is defined by a seasonal light regime extending between 24-hour light (Midnight Sun) and 24-hour dark (Polar Night). Light itself acts as an important cue for marine zooplankton, dictating their orientation/navigation and vertical migration, prey detection and predator avoidance, and population dynamics/reproductive strategies. Changes in the spectral, intensity, and duration components of downwelling irradiance during Midnight Sun and Polar Night contribute to the annual Arctic light climate, and to what characteristics of light are used for zooplankton visual processes. Additionally, as the Arctic region is warming at an alarming rate, the loss of annual sea ice and snow coverage is projected to increase incoming illumination into the water column, impacting zooplankton visual systems, trophic dynamics, and predator-prey interactions. ☐ Given the marked differences in annual light climate at high latitudes, the objective of this study was to determine the behavioral responses of zooplankton species to spectral and irradiance light stimuli during Midnight Sun and Polar Night. The copepod species Metridia longa copepods were selected as the target species for this research due to their biomass in Atlantic-Arctic waters, vertical migration behaviors, and bioluminescent capabilities. While Polar Night twilight peak emissions are blue dominant (λmax = 455 nm) there is a shift towards green light (λmax = 550 nm) availability during Midnight Sun due to spring phytoplankton blooms and suspended particulate matter in the water column. Therefore, it was hypothesized that copepods will exhibit a broad spectral response sensitivity in the blue-green wavelengths in order to compensate for the annual shifts in available spectra. Additionally, it is expected that M. longa copepods will have a heightened irradiance response during Polar Night compared to Midnight Sun. Zooplankton visual systems are often more sensitive in low light conditions, thus it is hypothesized that irradiance responses will be increased ... Thesis Arctic Arctic copepod Arctic Atlantic Arctic Atlantic-Arctic Phytoplankton polar night Sea ice Zooplankton Copepods midnight sun The University of Delaware Library Institutional Repository Arctic |
institution |
Open Polar |
collection |
The University of Delaware Library Institutional Repository |
op_collection_id |
ftunivdelaware |
language |
English |
topic |
Arctic Irradiance response Metridia longa Midnight Sun Polar Night Spectral response |
spellingShingle |
Arctic Irradiance response Metridia longa Midnight Sun Polar Night Spectral response Lightfoot, Meaghan Light sensitivity of the Arctic copepod Metridia longa during midnight sun and polar night |
topic_facet |
Arctic Irradiance response Metridia longa Midnight Sun Polar Night Spectral response |
description |
The Arctic is defined by a seasonal light regime extending between 24-hour light (Midnight Sun) and 24-hour dark (Polar Night). Light itself acts as an important cue for marine zooplankton, dictating their orientation/navigation and vertical migration, prey detection and predator avoidance, and population dynamics/reproductive strategies. Changes in the spectral, intensity, and duration components of downwelling irradiance during Midnight Sun and Polar Night contribute to the annual Arctic light climate, and to what characteristics of light are used for zooplankton visual processes. Additionally, as the Arctic region is warming at an alarming rate, the loss of annual sea ice and snow coverage is projected to increase incoming illumination into the water column, impacting zooplankton visual systems, trophic dynamics, and predator-prey interactions. ☐ Given the marked differences in annual light climate at high latitudes, the objective of this study was to determine the behavioral responses of zooplankton species to spectral and irradiance light stimuli during Midnight Sun and Polar Night. The copepod species Metridia longa copepods were selected as the target species for this research due to their biomass in Atlantic-Arctic waters, vertical migration behaviors, and bioluminescent capabilities. While Polar Night twilight peak emissions are blue dominant (λmax = 455 nm) there is a shift towards green light (λmax = 550 nm) availability during Midnight Sun due to spring phytoplankton blooms and suspended particulate matter in the water column. Therefore, it was hypothesized that copepods will exhibit a broad spectral response sensitivity in the blue-green wavelengths in order to compensate for the annual shifts in available spectra. Additionally, it is expected that M. longa copepods will have a heightened irradiance response during Polar Night compared to Midnight Sun. Zooplankton visual systems are often more sensitive in low light conditions, thus it is hypothesized that irradiance responses will be increased ... |
format |
Thesis |
author |
Lightfoot, Meaghan |
author_facet |
Lightfoot, Meaghan |
author_sort |
Lightfoot, Meaghan |
title |
Light sensitivity of the Arctic copepod Metridia longa during midnight sun and polar night |
title_short |
Light sensitivity of the Arctic copepod Metridia longa during midnight sun and polar night |
title_full |
Light sensitivity of the Arctic copepod Metridia longa during midnight sun and polar night |
title_fullStr |
Light sensitivity of the Arctic copepod Metridia longa during midnight sun and polar night |
title_full_unstemmed |
Light sensitivity of the Arctic copepod Metridia longa during midnight sun and polar night |
title_sort |
light sensitivity of the arctic copepod metridia longa during midnight sun and polar night |
publisher |
University of Delaware |
publishDate |
2023 |
url |
https://udspace.udel.edu/handle/19716/33254 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic copepod Arctic Atlantic Arctic Atlantic-Arctic Phytoplankton polar night Sea ice Zooplankton Copepods midnight sun |
genre_facet |
Arctic Arctic copepod Arctic Atlantic Arctic Atlantic-Arctic Phytoplankton polar night Sea ice Zooplankton Copepods midnight sun |
op_relation |
https://login.udel.idm.oclc.org/login?url=https://www.proquest.com/dissertations-theses/light-sensitivity-arctic-copepod-em-metridia/docview/2833510862/se-2?accountid=10457 1402227018 https://udspace.udel.edu/handle/19716/33254 |
_version_ |
1782329552963371008 |