Aquaculture Science
Online ISSN : 2185-0194
Print ISSN : 0371-4217
ISSN-L : 0371-4217
Original Papers
Effect of Temperature and Light on the Photosynthetic Performance of Two Edible Seaweeds: Meristotheca coacta Okamura and Meristotheca papulosa J. Agardh (Solieriaceae, Rhodophyta)
LidemanGregory N. NishiharaTadahide NoroRyuta Terada
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2012 Volume 60 Issue 3 Pages 377-388


The photosynthetic performance of two species of Meristotheca (Solieriaceae, Rhodophyta), M. coacta and M. papulosa, was investigated under a variety of temperature and light conditions to derive basic information regarding their physiology. A pulse amplitude modulated-chlorophyll fluorometer (Imaging-PAM) was used to generate rapid light curves (RLCs) to provide the relative electron transport rates (rETR) over 21 levels of photosynthetic active radiation (PAR), ranging from 0 to 1,078μmol photons m-2 s-1 at 14 temperatures (i.e., from 8 to 34°C). The initial slope (α), photoinhibition (β) and coefficient (γ) was calculated by fitting the RLCs to a nonlinear model of the form rETR=γ(1-exp(-α・PAR/γ)) (exp(-β・PAR/γ)) using a two-level hierarchical Bayesian model. Both species required temperatures ranging from 18 to 28°C to maintain optimal photosynthetic activity, as revealed by the estimated model parameters. The optimal PAR (PARopt) increased with increasing temperature. Meristotheca coacta and M. papulosa can be considered well-adapted to the current natural light and temperature conditions of southern Kyushu, Japan. Finding in this study should be useful to the design and manage mariculture programs to conserve the natural resources.

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© 2012 Japanese Society for Aquaculture Research
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