A patch of Calanus finmarchicus in the Lofoten-Vesterålen Region. Characteristics and determining factors
Zooplankton patchiness has been documented in many shelf areas and is of vital importance for understanding predator-prey relationships in pelagic marine systems. By combining hydrographic, acoustic and net data collected in spring 2017, we present a detailed understanding of the extent of this phen...
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UiT Norges arktiske universitet
2019
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Online Access: | https://hdl.handle.net/10037/16213 |
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ftunivtroemsoe:oai:munin.uit.no:10037/16213 2023-05-15T15:27:45+02:00 A patch of Calanus finmarchicus in the Lofoten-Vesterålen Region. Characteristics and determining factors Santana Hernández, Néstor 2019-05-16 https://hdl.handle.net/10037/16213 eng eng UiT Norges arktiske universitet UiT The Arctic University of Norway https://hdl.handle.net/10037/16213 openAccess Copyright 2019 The Author(s) Calanus finmarchicus Lofoten-Vesterålen zooplankton patchiness bioacoustics spring bloom Norwegian Coastal Current VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 BIO-3950 Master thesis Mastergradsoppgave 2019 ftunivtroemsoe 2021-06-25T17:56:50Z Zooplankton patchiness has been documented in many shelf areas and is of vital importance for understanding predator-prey relationships in pelagic marine systems. By combining hydrographic, acoustic and net data collected in spring 2017, we present a detailed understanding of the extent of this phenomenon in the Lofoten-Vesterålen region. Such patches are of potential interest not only for zooplankton harvesting, but also for commercially harvested species such as Atlantic Cod, which are crucial for the region’s economy. We hereby report evidences of a large surface patch (>1000 km2) of Calanus finmarchicus extending longitudinally over the whole continental shelf. The aggregation was closely tied to the water mass distribution in the area together with the timing of the bloom and its associated ascent of the overwintering copepod population. Although most organisms concentrated at surface, species-specific depth preferences resulted in statistically definite communities at diverse depths. Despite the low chlorophyll a values, high nutrient concentrations proved optimum conditions for phytoplankton development and significantly matched with the zooplankton distribution. We thus hypothesize that top-down control via intensive grazing pressure plays a significant role in regulating both the bloom’s size and the related surface aggregation of zooplankton. This paper will assess the dimentions, morphology and composition together with possible physical and biological drivers of zooplankton patches to provide a highly comprehensive view of the distribution of this copepod, its aggregating behaviour and its ecological importance. Master Thesis atlantic cod Calanus finmarchicus Lofoten Vesterålen University of Tromsø: Munin Open Research Archive Lofoten Vesterålen ENVELOPE(14.939,14.939,68.754,68.754) |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
Calanus finmarchicus Lofoten-Vesterålen zooplankton patchiness bioacoustics spring bloom Norwegian Coastal Current VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 BIO-3950 |
spellingShingle |
Calanus finmarchicus Lofoten-Vesterålen zooplankton patchiness bioacoustics spring bloom Norwegian Coastal Current VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 BIO-3950 Santana Hernández, Néstor A patch of Calanus finmarchicus in the Lofoten-Vesterålen Region. Characteristics and determining factors |
topic_facet |
Calanus finmarchicus Lofoten-Vesterålen zooplankton patchiness bioacoustics spring bloom Norwegian Coastal Current VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 BIO-3950 |
description |
Zooplankton patchiness has been documented in many shelf areas and is of vital importance for understanding predator-prey relationships in pelagic marine systems. By combining hydrographic, acoustic and net data collected in spring 2017, we present a detailed understanding of the extent of this phenomenon in the Lofoten-Vesterålen region. Such patches are of potential interest not only for zooplankton harvesting, but also for commercially harvested species such as Atlantic Cod, which are crucial for the region’s economy. We hereby report evidences of a large surface patch (>1000 km2) of Calanus finmarchicus extending longitudinally over the whole continental shelf. The aggregation was closely tied to the water mass distribution in the area together with the timing of the bloom and its associated ascent of the overwintering copepod population. Although most organisms concentrated at surface, species-specific depth preferences resulted in statistically definite communities at diverse depths. Despite the low chlorophyll a values, high nutrient concentrations proved optimum conditions for phytoplankton development and significantly matched with the zooplankton distribution. We thus hypothesize that top-down control via intensive grazing pressure plays a significant role in regulating both the bloom’s size and the related surface aggregation of zooplankton. This paper will assess the dimentions, morphology and composition together with possible physical and biological drivers of zooplankton patches to provide a highly comprehensive view of the distribution of this copepod, its aggregating behaviour and its ecological importance. |
format |
Master Thesis |
author |
Santana Hernández, Néstor |
author_facet |
Santana Hernández, Néstor |
author_sort |
Santana Hernández, Néstor |
title |
A patch of Calanus finmarchicus in the Lofoten-Vesterålen Region. Characteristics and determining factors |
title_short |
A patch of Calanus finmarchicus in the Lofoten-Vesterålen Region. Characteristics and determining factors |
title_full |
A patch of Calanus finmarchicus in the Lofoten-Vesterålen Region. Characteristics and determining factors |
title_fullStr |
A patch of Calanus finmarchicus in the Lofoten-Vesterålen Region. Characteristics and determining factors |
title_full_unstemmed |
A patch of Calanus finmarchicus in the Lofoten-Vesterålen Region. Characteristics and determining factors |
title_sort |
patch of calanus finmarchicus in the lofoten-vesterålen region. characteristics and determining factors |
publisher |
UiT Norges arktiske universitet |
publishDate |
2019 |
url |
https://hdl.handle.net/10037/16213 |
long_lat |
ENVELOPE(14.939,14.939,68.754,68.754) |
geographic |
Lofoten Vesterålen |
geographic_facet |
Lofoten Vesterålen |
genre |
atlantic cod Calanus finmarchicus Lofoten Vesterålen |
genre_facet |
atlantic cod Calanus finmarchicus Lofoten Vesterålen |
op_relation |
https://hdl.handle.net/10037/16213 |
op_rights |
openAccess Copyright 2019 The Author(s) |
_version_ |
1766358168019927040 |