Photosynthetica, 2015 (vol. 53), issue 3

Photosynthetica 2015, 53(3):464-470 | DOI: 10.1007/s11099-015-0119-0

Photosynthetic capacity and intrinsic water-use efficiency of Rhizophora mangle at its southernmost western Atlantic range

M. L. Gomes Soares1, M. M. Pereira Tognella2, E. Cuevas3, E. Medina4,5,*
1 Faculdade de Oceanografia, Núcleo de Estudos em Manguezais, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
2 Departamento de Ciências Agrárias e Biológicas, Universidade Federal do Espírito Santo, Centro Universitário Norte do Espírito Santo, São Mateus, ES, Brasil
3 Department of Biology and Center for Tropical Ecology and Conservation, University of Puerto Rico, Río Piedras, Puerto Rico
4 Instituto Venezolano de Investigaciones Científicas, Centro de Ecología, Edo. Miranda, Venezuela
5 International Institute of Tropical Forestry, USDA - Forest Service, San Juan, Puerto Rico

The southernmost presence of Rhizophora mangle in the western Atlantic coast occurs in coastal wetlands between 27 and 28°S in the State of Santa Catarina, Brazil. We selected mangrove communities at the estuary of the River Tavares, Florianopolis, and the Sonho Beach, Palhosa, for measurement of photosynthetic performance and intrinsic water-use efficiency of R. mangle and coexisting individuals of Avicennia schaueriana and Laguncularia racemosa, during the spring season. We used gas-exchange techniques and isotopic signatures of C and N to estimate instantaneous water-use and carboxylation efficiency (CE), long-term water-use efficiency, and potential N limitation. Results showed that R. mangle had significantly lower photosynthetic rates but similar conductance values as the other two species resulting in lower intrinsic water use (WUEi) and CE. WUEi and CE were positively correlated in L. racemosa and A. schaueriana, but not in R. mangle. At each site, δ13C values of A. schaueriana were consistently higher than those for the other species, indicating that these species are subjected to contrasting water stress conditions. Leaf concentrations of C were lower, whilst those of N were always higher in A. schaueriana, indicating accumulation of salts and nonprotein N-compounds in leaves. Nitrogen concentrations and moderate positive δ15N values indicated that plant growth at the study sites was not inhibited by nutrient deficiency, and was not influenced by urban residual waters. Lower photosynthetic rates and values of CE of R. mangle compared to the other two species may constitute constraining factors preventing this species from establishing at higher latitudes.

Keywords: intercellular CO2 concentration; leaf temperature; photosynthesis; stable isotope

Received: June 21, 2014; Accepted: December 12, 2014; Published: September 1, 2015Show citation

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Soares, M.L., Tognella, M.M., Cuevas, E., & Medina, E. (2015). Photosynthetic capacity and intrinsic water-use efficiency of Rhizophora mangle at its southernmost western Atlantic range. Photosynthetica, 53(3), 464-470. doi: 10.1007/s11099-015-0119-0.
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