Oxygen and temperature influence the distribution of deepwater Cape hake Merluccius paradoxus in the southern Benguela: a GAM analysis of a 10-year time-series
Generalised additive models (GAMs) were applied to survey data to assess the influence of dissolved oxygen, water temperature and year of sampling upon the presence/absence of small (≤15 cm TL), medium (16–34 cm TL) and large (≥35 cm TL) size classes of deepwater Cape hake Merluccius paradoxus captu...
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2019
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ftdatacite:10.6084/m9.figshare.11400168.v1 2023-05-15T16:18:27+02:00 Oxygen and temperature influence the distribution of deepwater Cape hake Merluccius paradoxus in the southern Benguela: a GAM analysis of a 10-year time-series FL Mbatha D Yemane M Ostrowski CL Moloney MR Lipiński 2019 https://dx.doi.org/10.6084/m9.figshare.11400168.v1 https://tandf.figshare.com/articles/Oxygen_and_temperature_influence_the_distribution_of_deepwater_Cape_hake_i_Merluccius_paradoxus_i_in_the_southern_Benguela_a_GAM_analysis_of_a_10-year_time-series/11400168/1 unknown Taylor & Francis https://dx.doi.org/10.2989/1814232x.2019.1688681 https://dx.doi.org/10.6084/m9.figshare.11400168 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Medicine 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology FOS Biological sciences Sociology FOS Sociology 69999 Biological Sciences not elsewhere classified Inorganic Chemistry FOS Chemical sciences Plant Biology Text article-journal Journal contribution ScholarlyArticle 2019 ftdatacite https://doi.org/10.6084/m9.figshare.11400168.v1 https://doi.org/10.2989/1814232x.2019.1688681 https://doi.org/10.6084/m9.figshare.11400168 2021-11-05T12:55:41Z Generalised additive models (GAMs) were applied to survey data to assess the influence of dissolved oxygen, water temperature and year of sampling upon the presence/absence of small (≤15 cm TL), medium (16–34 cm TL) and large (≥35 cm TL) size classes of deepwater Cape hake Merluccius paradoxus captured off the west coast of South Africa. Data were obtained from surveys using the RV Dr Fridtjof Nansen conducted in 2003 and from 2005 to 2013 during summer (January–February). Among the variables investigated, oxygen was the most important for the small size class (juveniles), with both low and high constraints (two-sided, ‘just right’ option), whereas for the medium and large size classes the oxygen effects were one-sided (avoiding lows). This finding, in combination with other published information, suggests that the Orange Banks is a nursery ground for juvenile M. paradoxus and that the area covered by this nursery ground can vary with the optimal oxygen concentration. The temperature constraint was generally wider and weaker than that for oxygen, being two-sided for the small and medium hake and one-sided (avoiding highs) for the large hake. The medium hake displayed the greatest tolerance to the investigated variables, which resulted in the widest distribution for this size class. Temperature, oxygen and sampling year play an important role in determining the distribution of M. paradoxus , but details of the biology (life cycle) of the species, such as its pelagic–demersal transition and associated movements, are no less important. Text Fridtjof Nansen DataCite Metadata Store (German National Library of Science and Technology) Fridtjof ENVELOPE(-56.717,-56.717,-63.567,-63.567) Gam ENVELOPE(-57.955,-57.955,-61.923,-61.923) Hake ENVELOPE(15.612,15.612,66.797,66.797) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Medicine 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology FOS Biological sciences Sociology FOS Sociology 69999 Biological Sciences not elsewhere classified Inorganic Chemistry FOS Chemical sciences Plant Biology |
spellingShingle |
Medicine 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology FOS Biological sciences Sociology FOS Sociology 69999 Biological Sciences not elsewhere classified Inorganic Chemistry FOS Chemical sciences Plant Biology FL Mbatha D Yemane M Ostrowski CL Moloney MR Lipiński Oxygen and temperature influence the distribution of deepwater Cape hake Merluccius paradoxus in the southern Benguela: a GAM analysis of a 10-year time-series |
topic_facet |
Medicine 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology FOS Biological sciences Sociology FOS Sociology 69999 Biological Sciences not elsewhere classified Inorganic Chemistry FOS Chemical sciences Plant Biology |
description |
Generalised additive models (GAMs) were applied to survey data to assess the influence of dissolved oxygen, water temperature and year of sampling upon the presence/absence of small (≤15 cm TL), medium (16–34 cm TL) and large (≥35 cm TL) size classes of deepwater Cape hake Merluccius paradoxus captured off the west coast of South Africa. Data were obtained from surveys using the RV Dr Fridtjof Nansen conducted in 2003 and from 2005 to 2013 during summer (January–February). Among the variables investigated, oxygen was the most important for the small size class (juveniles), with both low and high constraints (two-sided, ‘just right’ option), whereas for the medium and large size classes the oxygen effects were one-sided (avoiding lows). This finding, in combination with other published information, suggests that the Orange Banks is a nursery ground for juvenile M. paradoxus and that the area covered by this nursery ground can vary with the optimal oxygen concentration. The temperature constraint was generally wider and weaker than that for oxygen, being two-sided for the small and medium hake and one-sided (avoiding highs) for the large hake. The medium hake displayed the greatest tolerance to the investigated variables, which resulted in the widest distribution for this size class. Temperature, oxygen and sampling year play an important role in determining the distribution of M. paradoxus , but details of the biology (life cycle) of the species, such as its pelagic–demersal transition and associated movements, are no less important. |
format |
Text |
author |
FL Mbatha D Yemane M Ostrowski CL Moloney MR Lipiński |
author_facet |
FL Mbatha D Yemane M Ostrowski CL Moloney MR Lipiński |
author_sort |
FL Mbatha |
title |
Oxygen and temperature influence the distribution of deepwater Cape hake Merluccius paradoxus in the southern Benguela: a GAM analysis of a 10-year time-series |
title_short |
Oxygen and temperature influence the distribution of deepwater Cape hake Merluccius paradoxus in the southern Benguela: a GAM analysis of a 10-year time-series |
title_full |
Oxygen and temperature influence the distribution of deepwater Cape hake Merluccius paradoxus in the southern Benguela: a GAM analysis of a 10-year time-series |
title_fullStr |
Oxygen and temperature influence the distribution of deepwater Cape hake Merluccius paradoxus in the southern Benguela: a GAM analysis of a 10-year time-series |
title_full_unstemmed |
Oxygen and temperature influence the distribution of deepwater Cape hake Merluccius paradoxus in the southern Benguela: a GAM analysis of a 10-year time-series |
title_sort |
oxygen and temperature influence the distribution of deepwater cape hake merluccius paradoxus in the southern benguela: a gam analysis of a 10-year time-series |
publisher |
Taylor & Francis |
publishDate |
2019 |
url |
https://dx.doi.org/10.6084/m9.figshare.11400168.v1 https://tandf.figshare.com/articles/Oxygen_and_temperature_influence_the_distribution_of_deepwater_Cape_hake_i_Merluccius_paradoxus_i_in_the_southern_Benguela_a_GAM_analysis_of_a_10-year_time-series/11400168/1 |
long_lat |
ENVELOPE(-56.717,-56.717,-63.567,-63.567) ENVELOPE(-57.955,-57.955,-61.923,-61.923) ENVELOPE(15.612,15.612,66.797,66.797) |
geographic |
Fridtjof Gam Hake |
geographic_facet |
Fridtjof Gam Hake |
genre |
Fridtjof Nansen |
genre_facet |
Fridtjof Nansen |
op_relation |
https://dx.doi.org/10.2989/1814232x.2019.1688681 https://dx.doi.org/10.6084/m9.figshare.11400168 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.11400168.v1 https://doi.org/10.2989/1814232x.2019.1688681 https://doi.org/10.6084/m9.figshare.11400168 |
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1766004625880645632 |