title: Physiological responses of the ghost shrimp Neotrypaea uncinata (Milne Edwards 1837) (Decapoda: Thalassinidea) to oxygen availability and recovery after severe environmental hypoxia.
abstract: Hypoxia is a common and widespread phenomenon in aquatic ecosystems, imposing a significant challenge for the animals that inhabit such waters. In different habitats, however, the characteristics of these hypoxic events may differ, therefore imposing different challenges. We investigated the tolerance of adult ghost shrimp Neotrypaea uncinata (an intertidal mudflat dweller) to different partial pressures of oxygen (pO2), severe hypoxia (2 kPa) and recovery from hypoxia after different exposure times, mimicking the natural tidal cycle (6 h and 12 h). We calculated critical oxygen tension and categorize the adult ghost shrimps as oxyregulators (R value=75.27%). All physiological measurements (metabolic rate, oxyhemocyanin, hemolymph protein and lactate concentrations) were affected by exposure to low partial pressures of oxygen, but most of them recovered (with exception of metabolic rate) control values (21 kPa) after 6h under normoxic conditions. Low metabolic rate, high release of hemolymphatic proteins and anaerobic metabolism are suggested as response mechanisms to overcome hypoxic events during low tide.
authors.affiliation: Instituto de Acuicultura, Universidad Austral de Chile, P.O. Box 1327, Puerto Montt, Chile; Centro de Investigación i~mar, Universidad de Los Lagos, Puerto Montt, Chile. Electronic address: felix.leiva@ulagos.cl.
authors.forename: Félix P
authors.initials: FP
authors.lastname: Leiva
authors.affiliation: Department of Biosciences, College of Life and Environmental Sciences, University of Exeter, Exeter, United Kingdom. Electronic address: m.a.urbina-foneron@exeter.ac.uk.
authors.forename: Mauricio A
authors.initials: MA
authors.lastname: Urbina
authors.affiliation: Instituto de Acuicultura, Universidad Austral de Chile, P.O. Box 1327, Puerto Montt, Chile. Electronic address: pablocumillaf@uach.cl.
authors.forename: Juan Pablo
authors.initials: JP
authors.lastname: Cumillaf
authors.affiliation: Centro de Investigación i~mar, Universidad de Los Lagos, Puerto Montt, Chile. Electronic address: pgebauer@ulagos.cl.
authors.forename: Paulina
authors.initials: P
authors.lastname: Gebauer
authors.affiliation: Instituto de Acuicultura, Universidad Austral de Chile, P.O. Box 1327, Puerto Montt, Chile. Electronic address: kpaschke@uach.cl.
authors.forename: Kurt
authors.initials: K
authors.lastname: Paschke
mesh_terms: D000222:Adaptation, Physiological / Q000502:physiology; D000818:Animals; D001481:Basal Metabolism / Q000502:physiology; D002677:Chile; D033364:Decapoda / Q000378:metabolism / Q000502:physiology*; D017753:Ecosystem; D004777:Environment; D005843:Geography; D006458:Hemolymph / Q000378:metabolism / Q000502:physiology; D019344:Lactic Acid / Q000378:metabolism; D008297:Male; D010100:Oxygen / Q000378:metabolism*; D010101:Oxygen Consumption / Q000502:physiology*; D010313:Partial Pressure
chemical_list: D019344:Lactic Acid; D010100:Oxygen
keywords: Ecophysiology; Ghost shrimp; Hypoxia tolerance; Neotrypaea uncinata