|Scientific Name:||Phyllospadix scouleri|
|Red List Category & Criteria:||Least Concern ver 3.1|
|Assessor/s:||Short, F.T., Carruthers, T.J.R., Waycott, M., Kendrick, G.A., Fourqurean, J.W., Callabine, A., Kenworthy, W.J. & Dennison, W.C.|
|Reviewer/s:||Livingstone, S., Harwell, H. & Carpenter, K.E.|
This is a common species within suitable habitat and the population status is thought to be stable. There are no major threats although there are some localized declines due to coastal development and mechanical damage and the species is slow to recover from damage. This species is listed as Least Concern.
|Range Description:||Phyllospadix scouleri occurs in the Pacific from Southeast Alaska to the tip of Baja California and Mexico.|
Native:Canada; Mexico; United States
|FAO Marine Fishing Areas:||
Pacific – eastern central; Pacific – northeast
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||This is a common species in suitable substrate. The population status is thought to be stable.|
|Habitat and Ecology:||
Along the Pacific coast of North America, this species inhabits the lower intertidal and shallow subtidal zone (Green and Short 2003). Phyllospadix spp. grow on rocky substrates in regions with high wave exposure (Hemminga and Duarte 2000).
Surfgrass (Phyllospadix spp.) are not found where sea surface temperatures exceed 21°C in winter or 27°C in the summer. Surfgrass has a low tolerance to higher temperatures which suggests that populations in Baja California Sur might be impacted by global climate change. Phyllospadix scouleri is distributed higher in the lower intertidal and upper subtidal zones than P. torreyi (Ramirez-Garcia et al. 2002).
Phyllospadix scouleri dominates space and persists through all seasons without serious damage by disturbances such as storm waves. This species is long-lived and persistent and may preempt space, preventing other species from invading. This species is slow to recover after removal (Turner 1985).
|Major Threat(s):||There are no major threats to this species. Localized threats include coastal development and modifications and over-water structures in the form of ferry terminals, commercial docks. Mechanical damage from boats and dredging is also a minor localized threat.|
|Conservation Actions:||There are no known species-specific conservation measures for this species. It is not clear if the federal, provincial or state, or local administrative laws and ordinances recognize this species in the Northeast Pacific (Green and Short 2003).|
Green, E.P. and Short, F.T. 2003. World Atlas of Seagrasses. University of California Press, Berkeley.
Hemminga, M.A. and Duarte, C.M. 2000. Seagrass Ecology. Cambridge University Press, Cambridge.
IUCN. 2010. IUCN Red List of Threatened Species (ver. 2010.3). Available at: http://www.iucnredlist.org. (Accessed: 2 September 2010).
Ramirez-Garcia, P., Lot, A., Duarte, C.M., Terrados, J. and Agawin, N.S.R. 1998. Bathymetric distribution, biomass and growthdynamics of intertidal Phyllospadix scouleri and Phyllospadix torreyi in Baja California (Mexico). Marine Ecology Progress Series 173: 13-23.
Ramirez-Garcia, P., Terrados, J., Ramos, F., Lot, A., Ocana, D. and Duarte, C.M. 2002. Distribution and nutrient limitation of surfgrass, Phyllospadix scouleri and Phyllospadix torreyi, along the Pacific coast of Baja California (Mexico). Aquatic Botany 74: 121-131.
Turner, T. 1985. Stability of rocky intertidal surfgrass beds: persistence, preemption, and recovery. Ecology 66(1): 83-92.
|Citation:||Short, F.T., Carruthers, T.J.R., Waycott, M., Kendrick, G.A., Fourqurean, J.W., Callabine, A., Kenworthy, W.J. & Dennison, W.C. 2010. Phyllospadix scouleri. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 24 April 2014.|
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