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Photosynthesis and growth in macroalgae: linking functional-form and power-scaling approaches
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Orientador(es)
Resumo(s)
Grouping species into functional-form groups and measuring directly their surface area
to volume ratio are 2 common approaches to forecast primary production of marine macroalgae. A
link between the functional-form model (FFM) and the power-scaling approach (PSA) for a wide variety of marine macroalgae has been attempted for the first time in the present work. To test both
approaches, thalli of 44 species of marine benthic macroalgae were collected from intertidal zones
adjacent to Cádiz Bay. Metabolic rates, tissue nutrient content, surface area to biomass ratio (SA/B)
and specific growth rates were measured for these species. PSA slopes were close to 2/3 power for
growth rate, while metabolic rates scaled very close to, or matched, 3/4 power. The FFM descriptive
model provided similar results to the PSA when it was transformed to a numerical model through the
SA/B ratio. Even though both models appear to be valid, the problems derived from species allocation into morphological groups, and other previous criticisms, make the direct use of SA/B ratios more
suitable for representing primary production in macroalgal functional groups in numerical models of
coastal ecosystems.
Descrição
Palavras-chave
Functional form Cádiz Bay Marine macroalgae Photosynthesis Primary production Surface area to biomass ratio (SA/B) Scaling Specific thallus area
Contexto Educativo
Citação
Editora
Inter-Research