NDLI: Impact of air exposure on the photobiology and biochemical profile of an aggressive intertidal competitor, the zoanthid Palythoa caribaeorum

Content Provider	Springer Nature Link
Author	Rosa, Inês C. Rocha, Rui J. M. Lopes, Ana Cruz, Igor C. S. Calado, Ricardo Bandarra, Narcisa Kikuchi, Ruy K. Soares, Amadeu M. V. M. Serôdio, João Rosa, Rui
Copyright Year	2016
Abstract	The colonization of intertidal habitats is a challenging process. During low tide, many photosynthetic organisms, including symbiotic zoanthids, can be partially exposed to air eliciting significant physiological impairments, which may ultimately dictate the rate of colonization in such environments. Within this context, the present study aims to investigate, for the first time, the effects of air exposure on the fatty acid (FA) content and photobiological parameters of Palythoa caribaeorum, by comparing emerged and immersed polyps, within the same colony, during low tide. Tidal environment did not significantly affect FA percentages, but polyps that were emerged showed lower FA content than the immersed ones. Saturated FA fraction contributed the most to those dissimilarities, followed by the highly unsaturated and polyunsaturated FA fractions. Concomitantly, polyps that were permanently immersed displayed significantly higher values of the maximum quantum yield of photosystem II (F v/F m) when compared with emerged polyps. An opposite pattern was observed regarding the indices derived from the rapid light-response curves of relative electron transport rate (α, ETRmax and E k). We argue that FA differences within each colony seem to be a consequence of impairments in carbon production with photoautotrophic origin. Our findings also suggest that emerged polyps display higher efficiency in responding to rapid light fluctuation, which seems to be a peculiar adaptation to these challenging environments. Thus, in addition to its morphological plasticity, P. caribaeorum seems to display a large trophic plasticity that may be linked with the aggressive competitive nature for vital resources in such tidal habitats and widespread distribution.
Starting Page	1
Ending Page	11
Page Count	11
File Format	PDF
ISSN	00253162
Journal	Marine Biology
Volume Number	163
Issue Number	11
e-ISSN	14321793
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-10-11
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Marine & Freshwater Sciences Freshwater & Marine Ecology Oceanography Microbiology Zoology
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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