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Is light the limiting factor for the distribution of benthic symbiont bearing foraminifera on the Great Barrier Reef?

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dc.contributor Australian Institute Of Marine Science
dc.contributor James Cook Univ
dc.contributor James Cook University
dc.contributor Sch Earth Sci
dc.contributor Australian Inst Marine Sci
dc.contributor Australian Institute Of Marine Science (aims) en HENDERSON, ROBERT NOBES, KRISTIE UTHICKE, SVEN 2013-02-28T06:43:20Z 2013-02-28T06:43:20Z 2017-03-21T00:59:45Z 2020-09-02T04:12:55Z 2017-03-21T00:59:45Z 2013-02-28T06:43:20Z 2013-02-28T06:43:20Z 2020-09-02T04:12:55Z 2008-08-20
dc.identifier 7459 en
dc.identifier.citation Nobes KL, Uthicke S and Henderson R (2008) Is light the limiting factor for the distribution of benthic symbiont bearing foraminifera on the Great Barrier Reef?. Journal of Experimental Marine Biology and Ecology. 363: 48-57. en
dc.identifier.issn 0022-0981
dc.description Link to abstract/full text - en
dc.description.abstract We investigated foraminifera in sediment samples from three different depths (2 to 5 m, 6 to 8 m and 9 to 13 m) on six reefs along an environmental gradient in the Whitsunday Island Group of the Great Barrier Reef (GBR) to test the hypothesis that light is the main factor regulating communities of symbiont bearing benthic foraminifera. In addition, an experiment was conducted quantifying growth and photophysiological response using pulse-amplitude modulated (PAM) fluorometry, of three abundant foraminiferal taxa under three light conditions; all three of these taxa harbouring diatom-symbionts. Diversity of symbiotic foraminiferal taxa increased with distance from the mainland, and most symbiont bearing species increased in abundance. A redundancy analysis (RDA) indicated that sampling depth and percent surface light only explained a small amount of the observed variance in the distribution of species. In contrast, distance from the mainland alone explained nearly three times as much of the variance. The redundancy analysis grouped sample locations from most individual reefs together, irrespective of sample depths. This grouping was confirmed by an analysis of similarities (ANOSIM), yielding significant differences between most pairs of reefs. In the light manipulation experiment, Amphistegina spp. and Calcarina spp. exhibited similar growth rates (changes in surface area measured by photography and image analysis software) in all light conditions (ca. 100% Surface light, 30% and 7%). Growth of Heterostegina depressa significantly increased with a decrease in light intensity. All three foraminiferal taxa had the highest maximum quantum yield (F-v/F-m) in the lowest light condition. The range of yields in low light conditions (F-v/F-m values of ca. 0.6 - 0.7) was similar to that measured from foraminifera directly after field collection. Reduced F-v/F-m suggested that high irradiance conditions exert stress on the photosystem of the symbionts. Rapid light curves (RLCs) demonstrated that even specimens in high light were adapted to relatively low light conditions (light saturation occurring at ca. 43 mu mol photons m(-2) s(-1)). With decreasing light intensity, the initial slope of the RLCs (alpha) increased and the light intensity at onset of saturation (E-k) decreased, demonstrating that the symbiotic microalgae can rapidly respond to changes in light conditions. Thus, both field and laboratory experiments did not support the hypothesis that light is the train limiting factor of symbiont bearing foraminifera in our study area. Crown Copyright (C) 2008 Published by Elsevier B.V. All rights reserved.
dc.description.sponsorship We wish to thank the crew and masters of the RV Lady Basten for assisting with field work carried out in this project. We also wish to thank Dianne and Raymond Nobes for support throughout this study. This study was funded by the Cooperative Research Centre for the GBR World Heritage Area (CRC Reef) and the Marine Tropical Strategic Research Facility funds of the Department of Environment and Water Resources. [SS]
dc.description.uri en
dc.language English
dc.language en en
dc.relation.ispartof Null
dc.relation.ispartof Journal of Experimental Marine Biology and Ecology - pages: 363: 48-57 en
dc.relation.uri en
dc.subject Larger Foraminifera
dc.subject Ecology
dc.subject Photosynthetic Activity
dc.subject Coral-reefs
dc.subject Water-quality
dc.subject Fluorometer
dc.subject Australia
dc.subject Pollution
dc.subject Symbionts
dc.subject Heterostegina-depressa
dc.subject Environmental Sciences & Ecology
dc.subject Indicators
dc.subject Marine & Freshwater Biology
dc.subject Light Limitation
dc.subject Assemblages
dc.subject Foraminifera
dc.subject Coral Reefs
dc.title Is light the limiting factor for the distribution of benthic symbiont bearing foraminifera on the Great Barrier Reef?
dc.type journal article en
dc.identifier.doi 10.1016/j.jembe.2008.06.015
dc.identifier.wos WOS:000259419800007

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