Ecophysiology of Oxygen Supply in Cephalopods
Cephalopods are an important component of many marine ecosystems and support large fisheries. Their active lifestyles and complex behaviors are thought to be driven in large part by competition with fishes. Although cephalopods appear to compete successfully with fishes, a number of their important...
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ftunisfloridatam:oai:digitalcommons.usf.edu:etd-8462 2023-06-11T04:15:43+02:00 Ecophysiology of Oxygen Supply in Cephalopods Birk, Matthew A. 2018-06-22T07:00:00Z application/pdf https://digitalcommons.usf.edu/etd/7265 https://digitalcommons.usf.edu/context/etd/article/8462/viewcontent/Birk_usf_0206D_14844.pdf unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/etd/7265 https://digitalcommons.usf.edu/context/etd/article/8462/viewcontent/Birk_usf_0206D_14844.pdf USF Tampa Graduate Theses and Dissertations metabolism hypoxia respiration octopus squid Biology Other Oceanography and Atmospheric Sciences and Meteorology Physiology dissertation 2018 ftunisfloridatam 2023-05-04T18:07:10Z Cephalopods are an important component of many marine ecosystems and support large fisheries. Their active lifestyles and complex behaviors are thought to be driven in large part by competition with fishes. Although cephalopods appear to compete successfully with fishes, a number of their important physiological traits are arguably inferior, such as an inefficient mode of locomotion via jet propulsion and a phylogenetically limited means of blood-borne gas transport. In active shallow-water cephalopods, these traits result in an interesting combination of very high oxygen demand and limited oxygen supply. The ability to maintain active lifestyles despite these metabolic constraints makes cephalopods a fascinating subject for metabolic physiology. This dissertation focuses on the physiological adaptations that allow coleoid cephalopods to maintain a balance of oxygen supply and demand in a variety of environmental conditions. A critical component of understanding oxygen supply in any animal is knowing the means of oxygen delivery from the environment to the mitochondria. Squids are thought to obtain a fairly large portion of their oxygen via simple diffusion across the skin in addition to uptake at the gills. Although this hypothesis has support from indirect evidence and is widely accepted, no empirical examinations have been conducted to assess the validity of this hypothesis. In Chapter 2, I examined cutaneous respiration in two squid species, Doryteuthis pealeii and Lolliguncula brevis, by using a divided chamber to physically separate the mantle cavity and gills from the outer mantle surface. I measured the oxygen consumption rate in the two compartments and found that, at rest, squids only obtain enough oxygen cutaneously to meet demand of the skin tissue locally (12% of total). The majority of oxygen is obtained via the traditional branchial pathway. In light of these findings, I re-examine and discuss the indirect evidence that has supported the cutaneous respiration hypothesis. Ocean acidification is ... Doctoral or Postdoctoral Thesis Ocean acidification Digital Commons University of South Florida (USF) |
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Digital Commons University of South Florida (USF) |
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topic |
metabolism hypoxia respiration octopus squid Biology Other Oceanography and Atmospheric Sciences and Meteorology Physiology |
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metabolism hypoxia respiration octopus squid Biology Other Oceanography and Atmospheric Sciences and Meteorology Physiology Birk, Matthew A. Ecophysiology of Oxygen Supply in Cephalopods |
topic_facet |
metabolism hypoxia respiration octopus squid Biology Other Oceanography and Atmospheric Sciences and Meteorology Physiology |
description |
Cephalopods are an important component of many marine ecosystems and support large fisheries. Their active lifestyles and complex behaviors are thought to be driven in large part by competition with fishes. Although cephalopods appear to compete successfully with fishes, a number of their important physiological traits are arguably inferior, such as an inefficient mode of locomotion via jet propulsion and a phylogenetically limited means of blood-borne gas transport. In active shallow-water cephalopods, these traits result in an interesting combination of very high oxygen demand and limited oxygen supply. The ability to maintain active lifestyles despite these metabolic constraints makes cephalopods a fascinating subject for metabolic physiology. This dissertation focuses on the physiological adaptations that allow coleoid cephalopods to maintain a balance of oxygen supply and demand in a variety of environmental conditions. A critical component of understanding oxygen supply in any animal is knowing the means of oxygen delivery from the environment to the mitochondria. Squids are thought to obtain a fairly large portion of their oxygen via simple diffusion across the skin in addition to uptake at the gills. Although this hypothesis has support from indirect evidence and is widely accepted, no empirical examinations have been conducted to assess the validity of this hypothesis. In Chapter 2, I examined cutaneous respiration in two squid species, Doryteuthis pealeii and Lolliguncula brevis, by using a divided chamber to physically separate the mantle cavity and gills from the outer mantle surface. I measured the oxygen consumption rate in the two compartments and found that, at rest, squids only obtain enough oxygen cutaneously to meet demand of the skin tissue locally (12% of total). The majority of oxygen is obtained via the traditional branchial pathway. In light of these findings, I re-examine and discuss the indirect evidence that has supported the cutaneous respiration hypothesis. Ocean acidification is ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Birk, Matthew A. |
author_facet |
Birk, Matthew A. |
author_sort |
Birk, Matthew A. |
title |
Ecophysiology of Oxygen Supply in Cephalopods |
title_short |
Ecophysiology of Oxygen Supply in Cephalopods |
title_full |
Ecophysiology of Oxygen Supply in Cephalopods |
title_fullStr |
Ecophysiology of Oxygen Supply in Cephalopods |
title_full_unstemmed |
Ecophysiology of Oxygen Supply in Cephalopods |
title_sort |
ecophysiology of oxygen supply in cephalopods |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2018 |
url |
https://digitalcommons.usf.edu/etd/7265 https://digitalcommons.usf.edu/context/etd/article/8462/viewcontent/Birk_usf_0206D_14844.pdf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
USF Tampa Graduate Theses and Dissertations |
op_relation |
https://digitalcommons.usf.edu/etd/7265 https://digitalcommons.usf.edu/context/etd/article/8462/viewcontent/Birk_usf_0206D_14844.pdf |
_version_ |
1768372759245619200 |