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Activity and positioning of eurythermal hydrothermal vent sulphide worms in a variable thermal environment

Citation

Bates, AE and Bird, TJ and Robert, K and Onthank, KL and Quinn, GP and Juniper, SK and Lee, RW, Activity and positioning of eurythermal hydrothermal vent sulphide worms in a variable thermal environment, Journal of Experimental Marine Biology and Ecology, 448 pp. 149-155. ISSN 0022-0981 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 Elsevier B.V.

DOI: doi:10.1016/j.jembe.2013.06.015

Abstract

Here we investigate behavioral responses to fine-scale spatial and temporal temperature gradients in a heat tolerant hydrothermal vent worm (Paralvinella sulfincola). While this species has been a model organism for understanding physiological adaptations to extreme environments, lacking are corroborative in situ experiments and characterization of temperature-related behaviors representing the lower thermal tolerance range of this species. To address this knowledge gap, we first quantified the upper thermal limit for this species using a rapid heating protocol executed remotely on the seafloor. Second, we used a combination of in situ observations and shipboard experiments to test for temperature-dependent patterns in activity and behavior. We confirm that P. sulfincola is remarkably eurythermal and demonstrates a thermal niche breadth exceeding 45 C. We further show that the activity and positioning of worms relate to temperatures within its lower preferred range (i.e., between 4 and 20 C). Worms tended to remain closer to their tube openings and held their branchial crown in a consistent location when fluids were relatively warm. By contrast, when fluids were cooler, both the distance worms were observed from their tubes and positioning of their branchial crown were more variable. A Bayesian hidden Markov model classified each worm at each time interval as being in a high or low activity state according to the magnitude of change in their orientation and how far they moved between successive time lapse images. We found that the transition between active and inactive states at any time period is related to fluid temperature. Our observations indicate that the behavior of the worms is temperature-dependent, which may in turn reflect temperature-related variables such as the delivery of food particles, dissolved oxygen concentration, or relative environmental variability. Our findings demonstrate that this species can respond behaviorally to very fine-scale environmental variability in a manner not simply predicted by models of increasing activity with temperature.

Item Details

Item Type:Refereed Article
Keywords:behavior, eurythermal, hydrothermal vent, Paralvinella, sulphide worm, thermal variability
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Ecological Physiology
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Marine Flora, Fauna and Biodiversity
Author:Bates, AE (Dr Amanda Bates)
Author:Bird, TJ (Mr Tomas Bird)
ID Code:91555
Year Published:2013
Web of Science® Times Cited:3
Deposited By:IMAS Research and Education Centre
Deposited On:2014-05-22
Last Modified:2014-12-18
Downloads:0

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