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https://hdl.handle.net/2440/52320
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dc.contributor.author | Matthews, P. | - |
dc.contributor.author | Seymour, R. | - |
dc.date.issued | 2008 | - |
dc.identifier.citation | The Journal of Experimental Biology, 2008; 211(24):3790-3799 | - |
dc.identifier.issn | 0022-0949 | - |
dc.identifier.issn | 1477-9145 | - |
dc.identifier.uri | http://hdl.handle.net/2440/52320 | - |
dc.description.abstract | Unlike all other diving insects, backswimmers of the genus Anisops can exploit the pelagic zone by temporarily achieving near-neutral buoyancy during the course of a dive. They begin a dive positively buoyant due to the large volume of air carried in their ventral air-stores, but rapidly enter a protracted period of near-neutral buoyancy before becoming negatively buoyant. This dive profile is due to haemoglobin found in large tracheated cells in the abdomen. Fibre optic oxygen probes placed in the air-stores of submerged bugs revealed that oxygen partial pressure (PO2) dropped in a sigmoid curve, where a linear decline preceded a plateau between 5.1 and 2.0 kPa, before a final drop. Buoyancy measurements made by attaching backswimmers to a sensitive electronic balance showed the same three phases. Inactivating the haemoglobin by fumigating backswimmers with 15% CO eliminated both buoyancy and PO2 plateaus. Oxygen unloaded from the haemoglobin stabilises the air-store during the neutrally buoyant phase after a decrease in volume of between 16% and 19%. Using measurements of air-store PO2 and volume, it was calculated that during a dive the haemoglobin and air-store contribute 0.25 and 0.26 µl of oxygen, respectively. | - |
dc.description.statementofresponsibility | Philip G. D. Matthews and Roger S. Seymour | - |
dc.language.iso | en | - |
dc.publisher | Company of Biologists Ltd | - |
dc.source.uri | http://dx.doi.org/10.1242/jeb.018721 | - |
dc.subject | buoyancy | - |
dc.subject | haemoglobin | - |
dc.subject | insect | - |
dc.subject | respiration | - |
dc.title | Haemoglobin as a buoyancy regulator and oxygen supply in the backswimmer (Notonectidae, Anisops) | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1242/jeb.018721 | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Seymour, R. [0000-0002-3395-0059] | - |
Appears in Collections: | Aurora harvest Earth and Environmental Sciences publications |
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