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Following up on a Margalevian concept: interactions and exchanges among adjacent parcels of coastal landscapes
Valiela, I.; Bowen, J.L.; Cole, M.L.; Kroeger, K.D.; Lawrence, D.; Pabich, W.J.; Tomasky, G.; Mazzilli, S. (2001). Following up on a Margalevian concept: interactions and exchanges among adjacent parcels of coastal landscapes. Sci. Mar. (Barc.) 65(Suppl. 2): 215-229
In: Scientia Marina (Barcelona). Consejo Superior de Investigaciones Científicas. Institut de Ciènces del Mar: Barcelona. ISSN 0214-8358, more
Peer reviewed article  

Also published as
  • Valiela, I.; Bowen, J.L.; Cole, M.L.; Kroeger, K.D.; Lawrence, D.; Pabich, W.J.; Tomasky, G.; Mazzilli, S. (2001). Following up on a Margalevian concept: interactions and exchanges among adjacent parcels of coastal landscapes, in: Gili, J.-M. et al. (Ed.) A Marine Science Odyssey into the 21st Century. Scientia Marina (Barcelona), 65(Suppl. 2): pp. 215-229, more

Available in Authors 

Keywords
    Marine; Brackish water; Fresh water

Authors  Top 
  • Valiela, I.
  • Bowen, J.L.
  • Cole, M.L.
  • Kroeger, K.D.
  • Lawrence, D.
  • Pabich, W.J.
  • Tomasky, G.
  • Mazzilli, S.

Abstract
    Some decades ago Margalef speculated that study of the exchanges across boundaries that separate different types of ecological systems would provide significant insights about properties and processes within the units that make up ecological mosaics. Although such boundaries might be difficult to define, it seemed likely that such exchanges among units would influence the function and structure of the adjoined systems. In this paper we explore exchanges across such ecological boundaries in coastal ecosystems in Cape Cod, Massachusetts, and elsewhere. We find that, indeed, definition of such boundaries is ambiguous, but study of the exchanges is more useful. In the Cape Cod system, water transport down-gradient is the dominant mechanism exerting influence on down-gradient systems. The direction of ecological control across such boundaries is largely asymmetrical, and properties of up-gradient units exert significant influence on down-gradient units. General properties of donor and receptor parcels are hard to discern, but clearly, parcels making up an ecological mosaic are not independent units, but are coupled by transfers from upgradient tesserae. Studies of controls of ecological systems need to include inter-unit influences as well as internal mechanisms.

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