Open AccessThe effect of nutrient enrichment on the growth, nucleic acid concentrations, and elemental stoichiometry of coral reef macroalgae
Author(s) -
Reef Ruth,
Pandolfi John M.,
Lovelock Catherine E.
Publication year - 2012
Publication title -
ecology and evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.17
H-Index - 63
ISSN - 2045-7758
DOI - 10.1002/ece3.330
Subject(s) - biology , nutrient , photosynthesis , algae , botany , coral reef , coral , dry weight , sargassum , growth rate , ecological stoichiometry , symbiosis , relative growth rate , reef , chlorophyta , nitrogen , ecology , chemistry , bacteria , geometry , mathematics , genetics , organic chemistry
The growth rate hypothesis ( GRH ) links growth rates with organism elemental stoichiometry. Support for the GRH was found for many animal species, but less so for plants. This is the first study to test the GRH in macroalgae. Tropical coral reef macroalgae from three lineages, C aulerpa serrulata ( C hlorophyta), L aurencia intricata ( R hodophyta), and S argassum polyphyllum ( P haeophyceae) were grown enriched with nitrogen or phosphorous and under control conditions at H eron I sland on the G reat B arrier R eef, A ustralia. Growth rate, photosynthesis, nucleic acid composition, and elemental stoichiometry were measured. Nutrient enrichment had positive effects on photosynthetic rates and on investment in RNA . However, growth rate was not correlated with either photosynthetic rates or RNA content; thus, we did not find support for the GRH in tropical macroalgae. Macroalgae, especially L . intricata , accumulated P to very high levels (>0.6% of dry weight). The growth rate response to tissue P concentrations was unimodal. Above 0.21%, P accumulation had negative effects on growth. Nitrogen was not stored, but evidence of futile cycling was observed. The capacity to store large amounts of P is probably an adaptation to the low and patchy nutrient environment of the tropical oceans.