Salinity induced changes in haemolymph osmolality and total metabolic rate of the mud crab Rhithropanopeus harrisii Gould, 1841 from Baltic coastal waters

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• 作者：Monika Normant ; Magdalena Gibowicz
• 关键词：Baltic Sea ; Haemolymph osmolality ; Heat dissipation ; Metabolic rate ; Rhithropanopeus harrisii ; Salinity
• 刊名：Journal of Experimental Marine Biology and Ecology
• 出版年：2008
• 出版时间：22 February 2008
• 年：2008
• 卷：355
• 期：2
• 页码：145-152
• 全文大小：404 K

文摘

The specific metabolic rate (SMR) and haemolymph osmolality (HO) of the mud crab Rhithropanopeus harrisii Gould, 1841 from Baltic brackish waters were measured at a habitat salinity of 7 psu (T = 15 °C, full air saturation) and after step-wise acclimation to a salinity range of 3–27 psu. Values of SMR at 7 psu varied between 0.40 and 3.89 J g^{− 1} WW h^{− 1} (n = 25, wet weight range 0.051–1.142 g) and were significantly (p < 0.05) related to the specimen's wet weight (WW) according to the power regression SMR = 0.94 WW^{− 0.41} (R² = 0.68). The SMR of females did not differ significantly (p > 0.05) from those of males. When exposed to higher salinities, the SMR of R. harrisii decreased significantly (p < 0.05) and reached a minimum value at 23 psu (0.55 ± 0.05 J g^{− 1} WW h^{− 1}, n = 6). Mean haemolymph osmolality at 7 psu amounted to 581 ± 26 mOsm kg^{− 1} (n = 5) and was 2.9 times higher than that of the external medium. R. harrisii hyperosmoregulated its body fluids up to 24 psu (727 mOsm kg^{− 1}) at which salinity the isosmotic point was reached.