Haemolymph inorganic ion composition, physiology and behaviour dependent on temperature and magnesium in adult Paralomis granulosa (Decapoda, Anomura, Lithodidae) ...

• Main Authors: Wittmann, Astrid, Pörtner, Hans-Otto, Sartoris, Franz-Josef
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2012
• Subjects: Experiment; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158; Arctic; Antarctic; Wittmann; Antarc*; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.788856; https://doi.pangaea.de/10.1594/PANGAEA.788856

A low capacity for regulation of extracellular Mg2+ has been proposed to exclude reptant marine decapod crustaceans from temperatures below 0°C and thus to exclude them from the high Antarctic. To test this hypothesis and to elaborate the underlying mechanisms in the most cold-tolerant reptant decapod family of the sub-Antarctic, the Lithodidae, thermal tolerance was determined in the crab Paralomis granulosa (Decapoda, Anomura, Lithodidae) using an acute stepwise temperature protocol (-1°, 1°, 4°, 7°, 10°, and 13°C). Arterial and venous oxygen partial pressures (Po2) in hemolymph, heartbeat and ventilation beat frequencies, and hemolymph cation composition were measured at rest and after a forced activity (righting) trial. Scopes for heartbeat and ventilation beat frequencies and intermittent heartbeat and scaphognathite beat rates at rest were evaluated. Hemolymph [Mg2+] was experimentally reduced from 30 mmol/L to a level naturally observed in Antarctic caridean shrimps (12 mmol/L) to investigate whether ... : Supplement to: Wittmann, Astrid; Pörtner, Hans-Otto; Sartoris, Franz-Josef (2012): A role for oxygen delivery and extracellular magnesium in limiting cold tolerance of the Sub-Antarctic stone crab Paralomis granulosa? Physiological and Biochemical Zoology, 85(3), 285-298 ...