Tide-related biological rhythm in the oxygen consumption rate of ghost shrimp (Neotrypaea uncinata).
The effects of tidal height (high and low), acclimation to laboratory conditions (days in captivity) and oxygen level (hypoxia and normoxia) were evaluated in the oxygen consumption rate (OCR) of the ghost shrimp Neotrypaea uncinata We evaluated the hypothesis that N. uncinata reduces its OCR during low tide and increases it during high tide, regardless of oxygen level or acclimation. Additionally, the existence of an endogenous rhythm in OCR was explored, and we examined whether it synchronized with tidal, diurnal or semidiurnal cycles. Unexpectedly, high OCRs were observed at low tide, during normoxia, in non-acclimated animals. Results from a second, longer experiment under normoxic conditions suggested the presence of a tide-related metabolic rhythm, a response pattern not yet demonstrated for a burrowing decapod. Although rhythms persisted for only 2 days after capture, their period of 12.8 h closely matched the semidiurnal tidal cycle that ghost shrimp confront inside their burrows.
Centro i∼mar, Universidad de Los Lagos, Puerto Montt 5502764, Chile Instituto de Acuicultura, Universidad Austral de Chile, Puerto Montt, Casilla 1327, Chile felix.leiva@ulagos.cl.
Félix P
0000-0003-0249-9274
FP
Leiva
Centro i∼mar, Universidad de Los Lagos, Puerto Montt 5502764, Chile.
Edwin J
EJ
Niklitschek
Instituto de Acuicultura, Universidad Austral de Chile, Puerto Montt, Casilla 1327, Chile.
Kurt
K
Paschke
Centro i∼mar, Universidad de Los Lagos, Puerto Montt 5502764, Chile.
Paulina
P
Gebauer
Department of Biosciences, College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4QD, UK Departamento de Zoología, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Concepción 4070386, Chile.
Mauricio A
MA
Urbina
D000818:Animals; D033364:Decapoda / Q000378:metabolism*; D008297:Male; D010101:Oxygen Consumption; D010507:Periodicity; D055871:Tidal Waves
Acclimation; Biological clock; Hypoxia; Metabolism; Synchrony; Tidal cycle