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Scale-dependent benthic recolonization dynamics: life stage-based dispersal and demographic consequences
Whitlatch, R.B.; Lohrer, A.M.; Thrush, S.F.; Pridmore, R.D.; Hewitt, J.E.; Cummings, V.J.; Zajac, R.N. (1998). Scale-dependent benthic recolonization dynamics: life stage-based dispersal and demographic consequences. Hydrobiologia 375-376: 217-226
In: Hydrobiologia. Springer: The Hague. ISSN 0018-8158, more
Peer reviewed article  

Also published as
  • Whitlatch, R.B.; Lohrer, A.M.; Thrush, S.F.; Pridmore, R.D.; Hewitt, J.E.; Cummings, V.J.; Zajac, R.N. (1998). Scale-dependent benthic recolonization dynamics: life stage-based dispersal and demographic consequences, in: Baden, S. et al. (Ed.) Recruitment, Colonization, and Physical-Chemical Forcing in Marine Biological Systems: Proceedings of the 32nd European Marine Biology Symposium, held in Lysekil, Sweden, 16-22 August 1997. Developments in Hydrobiology, 132: pp. 217-226, more

Available in  Authors 
Document type: Conference paper

Keywords
    Developmental stages; Larval settlement; Life history; Population dynamics; Recruitment; Boccardia syrtis (Rainer, 1973) [WoRMS]; Polydora cornuta Bosc, 1802 [WoRMS]; Marine

Authors  Top 
  • Whitlatch, R.B.
  • Lohrer, A.M.
  • Thrush, S.F.
  • Pridmore, R.D.
  • Hewitt, J.E.
  • Cummings, V.J.
  • Zajac, R.N.

Abstract
    Soft-sediment recruitment dynamics are dependent upon two sources of colonists; larvae transported from the water column and post-settlement movement of juvenile and/or adult life-stages across the seabed. Differences in the relative dispersal ability of the different life-stages into disturbed patches of habitat should vary predictably with the spatial scale of the disturbance. Smaller patches with a greater edge:surface area ratio should be more influenced by the post-settlement colonist pool than larger patches possessing a smaller edge:surface area ratio. A life stage-based recolonization model, using a Polydora cornuta life table, has been developed to describe how differences in the immigration rates of larvae, juveniles and adults can influence within-patch recovery times. Model results indicate that immigration of adult stages into disturbed patches has the least influence on patch recovery time. In contrast, post-settlement juvenile stages generally has a pronounced effect on patch population dynamics. Experimental evidence of scale-dependent migration of different life-stages to disturbed patches is also presented for the spionid polychaete Boccardia syrtis. Future research on scale-dependent recolonization dynamics in soft-sediment habitats should focus on acquisition of within-patch demographic data in order to more fully understand the importance of post-settlement life-stage movement in regulating population and community dynamics.

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