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Respiratory physiology of three Indo-Pacific fiddler crabs: metabolic responses to intertidal zonation patterns

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We measured aerial and aquatic oxygen consumption values at typical diel extreme temperatures for Uca vocans, Uca tetragonon, and Uca crassipes from Hoga and the Kaledupa Islands in the Wakatobi National Park, Sulawesi, Indonesia. These fiddler crabs exhibit distinct intertidal distributions that may affect air and water oxygen extraction rates. Uca vocans and U. tetragonon occupy low intertidal zones that experience long submersion times, whereas U. crassipes inhabits high intertidal habitats having long emersion periods. Respective aerial oxygen consumption rates were 0.312, 0.300, and 0.193 mg/l at 26.0°C, and 0.600, 0.554, and 0.357 mg/l at 32.1°C. Aquatic oxygen consumption rates at 26.0 and 32.1°C were 0.0041, 0.0065, and 0.0028 mg/l, and 0.0063, 0.0047, and 0.0050 mg/l, respectively. Temperature quotients (Q10) for all crabs were approximately 2 in air; however, U. vocans and U. tetragonon increased Q10 to approximately 3 when moved to water, whereas U. crassipes Q10 values remained essentially unchanged. High oxygen extraction rates and Q10 responses in aerial environments may allow U. vocans and U. tetragonon to repay oxygen debt quickly during short emersion periods. Because U. crassipes spends most of its time emerged, it is less dependent on anaerobic respiration, and may not need to rapidly pay back oxygen debt. Nous avons mesuré les valeurs de la consommation d'oxygène, aérienne et aquatique aux températures extrêmes typiques diurnes chez Uca vocans, Uca tetragonon et Uca crassipes des îles Hoga et Kaledupa au parc national Wakatobi, Sulawesi, Indonésie. Ces crabes violonistes montrent des répartitions intertidales distinctes qui peuvent affecter les taux d'extraction d'oxygène de l'air et de l'eau. Uca vocans et U. tetragonon occupent les zones intertidales basses qui subissent de longues périodes de submersion tandis qu' U. crassipes habite les zones intertidales hautes qui ont de longues périodes d'émersion. Les taux respectifs de consommation d'oxygène aérien étaient de 0,312, 0,300 et 0,193 mg/l à 26°C, et 0,600, 0,554 et 0,357 mg/l à 32,1°C. Les taux de consommation d'oxygène aquatique à 26,0°C et 32,1°C étaient de 0,0041, 0,0065 et 0,0028 mg/l, et 0,0063, 0,0047 et 0,0050 mg/l, respectivement. Les quotients de température (Q10) pour tous les crabes étaient approximativement 2 dans l'air ; cependant, U. vocans et U. tetragonon avaient leur Q10 augmenté à environ 3 quand ils allaient à la mer, tandis que les valeurs de Q10 de U. crassipes restaient pratiquement inchangées. Les taux élevés d'extraction d'oxygène et les réponses du Q10 dans les environnements aériens pourraient permettre à U. vocans et U. tetragonon de compenser rapidement leur déficit en oxygène au cours des courtes périodes d'émersion. Comme U. crassipes passe la plupart de son temps émergé, il est moins dépendant de la respiration anaérobie, et peut ne pas avoir besoin de compenser son déficit en oxygène.


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