Facilitation of survival and growth of Baccharis halimifolia L. by Spartina alterniflora Loisel. in a created Louisiana salt marsh

  • Published source details Egerova J., Proffitt C.E. & Travis S.E. (2003) Facilitation of survival and growth of Baccharis halimifolia L. by Spartina alterniflora Loisel. in a created Louisiana salt marsh. Wetlands, 23, 250-256.


This study is summarised as evidence for the following.

Action Category

Directly plant trees/shrubs: brackish/saline wetlands

Action Link
Marsh and Swamp Conservation
  1. Directly plant trees/shrubs: brackish/saline wetlands

    A replicated study in 2000 in a salt marsh in Louisiana, USA (Egerova et al. 2003) reported 11–45% survival of planted groundsel Baccharis halimifolia seedlings after four months, but found that surviving seedlings grew. Four months after planting, 11% of groundsel seedlings planted into bare sediment were still alive. These seedlings were 49 cm tall on average, and had grown 4.4 cm taller since planting. For groundsel seedlings planted within patches of smooth cordgrass Spartina alterniflora, the survival rate was 45%. These seedlings were 68 cm tall on average, and had grown 7.2 cm taller since planting. Survival, final height and growth rate were all significantly greater for seedlings planted within cordgrass patches than bare sediment. Methods: In May–June 2000, a total of 160 groundsel seedlings were planted into 20 plots in the high intertidal zone of a salt marsh (constructed four years previously). The groundsel seedlings were 15–55 cm tall, transplanted from another area in the marsh, and planted approximately 25 cm apart within each plot. Ten plots were in the centre of smooth cordgrass patches (where most cordgrass stems were dead). Ten plots were on adjacent bare or sparsely vegetated sediment. Groundsel survival and height were monitored for up to four months after planting.

    (Summarised by: Nigel Taylor)

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