Impact of climate change on the American lobster (Homarus americanus): Physiological responses to combined exposure of elevated temperature and pCO2
| Autor: | Aaron K. Klymasz-Swartz, Jason R. Treberg, Garett J. P. Allen, Dirk Weihrauch, Alex R. Quijada-Rodriguez, Ashley Tripp, Gwangseok R. Yoon |
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| Rok vydání: | 2019 |
| Předmět: |
030110 physiology
0106 biological sciences 0301 basic medicine medicine.medical_specialty Homarus biology Physiology Chemistry Glutamate dehydrogenase Ocean acidification American lobster biology.organism_classification 010603 evolutionary biology 01 natural sciences Biochemistry Acclimatization Excretion 03 medical and health sciences Endocrinology Internal medicine Basal metabolic rate medicine Metabolic waste Molecular Biology |
| Zdroj: | Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology. 235:202-210 |
| ISSN: | 1095-6433 |
| DOI: | 10.1016/j.cbpa.2019.06.005 |
| Popis: | The physiological consequences of exposing marine organisms to predicted future ocean scenarios, i.e. simultaneous increase in temperature and p CO 2 , have only recently begun to be investigated. Adult American lobster ( Homarus americanus ) were exposed to either current (16 °C, 47 Pa p CO 2 , pH 8.10) or predicted year 2300 (20 °C, 948 Pa p CO 2 , pH 7.10) ocean parameters for 14–16 days prior to assessing physiological changes in their hemolymph parameters as well as whole animal ammonia excretion and resting metabolic rate. Acclimation of lobster simultaneously to elevated p CO 2 and temperature induced a prolonged respiratory acidosis that was only partially compensated for via accumulation of extracellular HCO 3 – and ammonia. Furthermore, acclimated animals possessed significantly higher ammonia excretion and oxygen consumption rates suggesting that future ocean scenarios may increase basal energetic demands on H. americanus . Enzyme activity related to protein metabolism (glutamine dehydrogenase, alanine aminotransferase, and aspartate aminotransferase) in hepatopancreas and muscle tissue were unaltered in future ocean scenario exposed animals; however, muscular citrate synthase activity was reduced suggesting that, while protein catabolism may be unchanged, the net energetic output of muscle may be compromised in future scenarios. Overall, H. americanus acclimated to ocean conditions predicted for the year 2300 appear to be incapable of fully compensating against climate change-related acid-base challenges and experience an increase in metabolic waste excretion and oxygen consumption. Combining our study with past literature on H. americanus suggests that the whole lifecycle from larvae to adult stages is at risk of severe growth, survival and reproductive consequences due to climate change. |
| Databáze: | OpenAIRE |
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