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- Title
Mantle cavity water oxygen partial pressure (Po<sub>2</sub>) in marine molluscs aligns with lifestyle.
- Authors
Abele, Doris; Kruppe, Melanie; Philipp, Eva E. R.; Brey, Thomas
- Abstract
Marine invertebrates with open circulatory system establish low and constant oxygen partial pressure (PO2) around their tissues. We hypothesized that as a first step towards maintenance of low haemolymph and tissue oxygenation, the PO2 in molluscan mantle cavity water should be lowered against normoxic (21 kPa) seawater PO2. but balanced high enough to meet the energetic requirements in a given species. We recorded PO2 in mantle cavity water of five molluscan species with different lifestyles, two pectinids (Aequipecten opercutaris. Pecten ma.ximus), two mud clams (Arctica islandica. Mya arenaria), and a limpet (Patella vulgata). All species maintain mantle cavity water oxygenation below normoxic PO2. Average mantle cavity water PO2 correlates positively with standard metabolic rate (SMR): highest in scallops and lowest in mud clams. Scallops show typical PO2 frequency distribution, with peaks between 3 and 10 kPa, whereas mud clams and limpets maintain mantle water PO2 mostly <5 kPa. Only A. islandica and P. vulgata display distinguishable temporal pattems in PO2 time series. Adjustment of mantle cavity PO2 to lower than ambient levels through controlled pumping prevents high oxygen gradients between bivalve tissues and surrounding tluid, limiting oxygen flux across the body surface. The pattems of PO2 in mantle cavity water eorrespond to molluscan ecotypes.
- Subjects
PHYSIOLOGY of marine invertebrates; MOLLUSK physiology; SCALLOPS; HEMOLYMPH; OXYGEN therapy; PHYSIOLOGY
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2010, Vol 67, Issue 6, p977
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/F10-035