Mantle cavity water oxygen partial pressure (Po2) in marine molluscs aligns with lifestyle
Mantle cavity water oxygen partial pressure (Po2) in marine molluscs aligns with lifestyle
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DOI：
10.1139/f10-035
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发表时间：
2010-06-01
影响因子：
2.4
通讯作者：
Brey, Thomas
中科院分区：
文献类型：
--
作者：
Abele, Doris;Kruppe, Melanie;Brey, Thomas
具有开放循环系统的海洋无脊椎动物在其组织周围建立低而恒定的氧分压（Po-2）。我们假设，作为维持低血淋巴和组织氧合的第一步，应降低对常氧（21千帕）海水Po-2，但平衡高到足以满足给定物种的能量需求的Po-2软体动物外套腔水。我们记录PO-2在地幔腔水的五种软体动物具有不同的生活方式，两个栉孔动物（Aequipecten opercularis，Pecten maximus），两个泥蛤（Arctica islandica，Mya arenaria），和帽贝（Patella vulgata）。所有物种保持地幔腔水氧合低于常氧Po-2。平均外套腔水Po-2与标准代谢率（SMR）呈正相关：扇贝最高，文蛤最低。扇贝具有典型的Po-2频率分布，峰值在3 ~ 10 kPa之间，而泥蚶和帽贝则主要维持地幔水Po-2
Marine invertebrates with open circulatory system establish low and constant oxygen partial pressure (Po-2) around their tissues. We hypothesized that as a first step towards maintenance of low haemolymph and tissue oxygenation, the Po-2 in molluscan mantle cavity water should be lowered against normoxic (21 kPa) seawater Po-2, but balanced high enough to meet the energetic requirements in a given species. We recorded Po-2 in mantle cavity water of five molluscan species with different lifestyles, two pectinids (Aequipecten opercularis, Pecten maximus), two mud clams (Arctica islandica, Mya arenaria), and a limpet (Patella vulgata). All species maintain mantle cavity water oxygenation below normoxic Po-2. Average mantle cavity water Po-2 correlates positively with standard metabolic rate (SMR): highest in scallops and lowest in mud clams. Scallops show typical Po-2 frequency distribution, with peaks between 3 and 10 kPa, whereas mud clams and limpets maintain mantle water Po-2 mostly