Phenology and productivity of C3 and C4 grasslands in Hawaii.

Grasslands account for a large proportion of global terrestrial productivity and play a critical role in carbon and water cycling. Within grasslands, photosynthetic pathway is an important functional trait yielding different rates of productivity along environmental gradients. Recently, C3-C4 sortin...

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Autores principales:	Stephanie Pau, Christopher J Still
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6e9ba6afddfa4049a41b3e3ba54c20fa
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spelling	oai:doaj.org-article:6e9ba6afddfa4049a41b3e3ba54c20fa2021-11-25T05:57:40ZPhenology and productivity of C3 and C4 grasslands in Hawaii.1932-620310.1371/journal.pone.0107396https://doaj.org/article/6e9ba6afddfa4049a41b3e3ba54c20fa2014-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0107396https://doaj.org/toc/1932-6203Grasslands account for a large proportion of global terrestrial productivity and play a critical role in carbon and water cycling. Within grasslands, photosynthetic pathway is an important functional trait yielding different rates of productivity along environmental gradients. Recently, C3-C4 sorting along spatial environmental gradients has been reassessed by controlling for confounding traits in phylogenetically structured comparisons. C3 and C4 grasses should sort along temporal environmental gradients as well, resulting in differing phenologies and growing season lengths. Here we use 10 years of satellite data (NDVI) to examine the phenology and greenness (as a proxy for productivity) of C3 and C4 grass habitats, which reflect differences in both environment and plant physiology. We perform phylogenetically structured comparisons based on 3,595 digitized herbarium collections of 152 grass species across the Hawaiian Islands. Our results show that the clade identity of grasses captures differences in their habitats better than photosynthetic pathway. Growing season length (GSL) and associated productivity (GSP) were not significantly different when considering photosynthetic type alone, but were indeed different when considering photosynthetic type nested within clade. The relationship between GSL and GSP differed most strongly between C3 clade habitats, and not between C3-C4 habitats. Our results suggest that accounting for the interaction between phylogeny and photosynthetic pathway can help improve predictions of productivity, as commonly used C3-C4 classifications are very broad and appear to mask important diversity in grassland ecosystem functions.Stephanie PauChristopher J StillPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 10, p e107396 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Stephanie Pau Christopher J Still Phenology and productivity of C3 and C4 grasslands in Hawaii.
description	Grasslands account for a large proportion of global terrestrial productivity and play a critical role in carbon and water cycling. Within grasslands, photosynthetic pathway is an important functional trait yielding different rates of productivity along environmental gradients. Recently, C3-C4 sorting along spatial environmental gradients has been reassessed by controlling for confounding traits in phylogenetically structured comparisons. C3 and C4 grasses should sort along temporal environmental gradients as well, resulting in differing phenologies and growing season lengths. Here we use 10 years of satellite data (NDVI) to examine the phenology and greenness (as a proxy for productivity) of C3 and C4 grass habitats, which reflect differences in both environment and plant physiology. We perform phylogenetically structured comparisons based on 3,595 digitized herbarium collections of 152 grass species across the Hawaiian Islands. Our results show that the clade identity of grasses captures differences in their habitats better than photosynthetic pathway. Growing season length (GSL) and associated productivity (GSP) were not significantly different when considering photosynthetic type alone, but were indeed different when considering photosynthetic type nested within clade. The relationship between GSL and GSP differed most strongly between C3 clade habitats, and not between C3-C4 habitats. Our results suggest that accounting for the interaction between phylogeny and photosynthetic pathway can help improve predictions of productivity, as commonly used C3-C4 classifications are very broad and appear to mask important diversity in grassland ecosystem functions.
format	article
author	Stephanie Pau Christopher J Still
author_facet	Stephanie Pau Christopher J Still
author_sort	Stephanie Pau
title	Phenology and productivity of C3 and C4 grasslands in Hawaii.
title_short	Phenology and productivity of C3 and C4 grasslands in Hawaii.
title_full	Phenology and productivity of C3 and C4 grasslands in Hawaii.
title_fullStr	Phenology and productivity of C3 and C4 grasslands in Hawaii.
title_full_unstemmed	Phenology and productivity of C3 and C4 grasslands in Hawaii.
title_sort	phenology and productivity of c3 and c4 grasslands in hawaii.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/6e9ba6afddfa4049a41b3e3ba54c20fa
work_keys_str_mv	AT stephaniepau phenologyandproductivityofc3andc4grasslandsinhawaii AT christopherjstill phenologyandproductivityofc3andc4grasslandsinhawaii
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Phenology and productivity of C3 and C4 grasslands in Hawaii.

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