Title

Variability in the ecophysiology of Halimeda spp. (Chlorophyta, Bryopsidales) on Conch Reef, Florida Keys, USA

Authors

Authors

K. Beach; L. Walters; P. Vroom; C. Smith; J. Coyer;C. Hunter

Comments

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Abbreviated Journal Title

J. Phycol.

Keywords

chl fluorescence; coral reefs; Halimeda opuntia; Halimeda tuna; macroalgal productivity; photosynthesis; GREAT-BARRIER-REEF; CORAL-REEFS; ALGA HALIMEDA; PHOTOSYNTHESIS; CARBONATE; GROWTH; PHOTOINHIBITION; PHYTOPLANKTON; REPRODUCTION; SEASONALITY; Plant Sciences; Marine & Freshwater Biology

Abstract

The photosynthetic performance, pigmentation, and growth of a Halimeda community were studied over a depth gradient on Conch Reef, Florida Keys, USA during summer-fall periods of 5 consecutive years. The physiology and growth of H. tuna (Ellis & Solander) Lamouroux and H. opuntia (L.) Lamouroux on this algal dominated reef were highly variable. Maximum rate of net photosynthesis (P-max ), respiration rate, and quantum efficiency (alpha) did not differ between populations of either species at 7 versus 21 m, even though the 21-m site received a 66% lower photon flux density (PFD). Physiological parameters, as well as levels of photosynthetic pigments, varied temporally. P-max , saturation irradiance, compensation irradiance, and growth were greatest in summer months, whereas alpha, chl a , chl b , and carotenoid concentrations were elevated each fall. Halimeda tuna growth rates were higher at 7 m compared with 21 m for only two of five growth trials. This may have arisen from variability in light and nutrient availability. Individuals growing at 7 m received a 29% greater PFD in August 2001 than in 1999. In August 1999 and 2001 seawater temperatures were uniform over the 14-m gradient, whereas in August 2000 cold water regularly intruded upon the 21-m but not the 7-m site. These results illustrate the potentially dynamic relationship between nutrients, irradiance, and algal productivity. This suggests the necessity of long-term monitoring over spatial and temporal gradients to accurately characterize factors that impact productivity.

Journal Title

Journal of Phycology

Volume

39

Issue/Number

4

Publication Date

1-1-2003

Document Type

Article

Language

English

First Page

633

Last Page

643

WOS Identifier

WOS:000184451100002

ISSN

0022-3646

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