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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Site conditions, not parental phenotype, determine the height of Spartina foliosa
Auteurs :	S. Trnka, Auteur ; J. B. Zedler, Auteur
Type de document :	Article
Dans :	Estuaries (23(4) AUG 2000)
Article en page(s) :	572-582
Résumé :	The effect of parental growth form on ramets introduced to new sites has broad implications for ecological restoration. We asked whether transplants of Spartina foliosa need to come from tall parents in order to produce tall stands for nesting by the Light-Footed clapper rail, one of southern California's many endangered, salt-marsh-dependent species. Tan and short S. foliosa transplants, collected from local salt marshes, were grown in a common garden and in microcosms, with different results. In the common garden, which had hypersaline soil, offspring of tall versus short clones did not differ, but they did respond to soil variations among blocks. In blocks with less sandy soil, stems were taller and up to 5 times more numerous, and patch sizes were up to 3 times larger After two years in low-salinity microcosms, transplants receiving nitrogen additions produced more stems and over twice the total stem length of controls, regardless of parental height form. A slight parental effect was seen in this benign environment; the maximum height of tall-form transplants was 15 cm taller than that of short-form transplants, but the effect did not persist through year 2. Results indicate that both height forms of S. foliosa grew better (taller and more dense) with less environmental stress (lower salinity, more nutrients). We conclude that environmental differences are more important than parental height form in determining S. foliosa growth. This means that, for restoration purposes, S, foliosa ramets can and should be collected from short clones, rather than from existing, prime nesting habitat.

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