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- W2002026996 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 223:143-155 (2001) - doi:10.3354/meps223143 Interactive roles of mesograzers and current flow in survival of kelps David Duggins1,*, James E. Eckman2, Christopher E. Siddon3, Terrie Klinger4 1Friday Harbor Laboratories, 620 University Road, University of Washington, Friday Harbour, Washington 98250, USA 2Office Naval Research, 800 North Quincy Street, Arlington, Virginia 22217-5660, USA 3Ecology and Evolutionary Biology, Brown University, Providence, Rhode Island 02912, USA 4School of Marine Affairs, University of Washington, 3707 Brooklyn Ave. N.E., Seattle, Washington 98105-6715, USA *E-mail: dduggins@u.washington.edu ABSTRACT: The relationship between hydrodynamic energy and biological processes is examined for a kelp-dominated marine community in the San Juan Archipelago. Populations of a common and widely distributed kelp, Nereocystis luetkeana, were established and rates and causes of mortality followed at 7 sites differing greatly in tidally driven current velocities and wave exposure (measured by permanently deployed instrument packages). Mortality of N. luetkeana was not related to storm energy, but exhibited a significant non-linear relationship with tidal current energy such that mortality rates were highest at sites exhibiting protracted periods of calm punctuated by episodes of strong currents. The role of mesograzers (primarily the gastropod Lacuna vincta) on survivorship in these kelp populations was evaluated in the field and in laboratory flume experiments. The relationship between grazer damage and stipe breaking force was investigated by measuring the tensile forces required to break experimentally damaged stipes. Although undamaged stipes can easily withstand the tensile forces imposed by even the strongest current and wave exposures, a very small amount of damage will have highly significant negative effects on breaking strength. While apparently responsible for a significant portion of N. luetkeana mortality in low and variable energy environments, L. vincta is unable to persist on kelp stipes in high-energy environments and its role there is trivial. The relationship between L. vincta grazing and hydrodynamic energy is however non-linear, because water movement has opposite effects on grazer foraging behavior and the drag forces imposed on kelps, and this results in a complex relationship between hydrodynamic energy and kelp survival. We suggest a conceptual model for relating kelp survival to grazing intensity in hydrodynamically variable environments. The model leads to the prediction, exhibited in our field results, that the probability of plant mortality may be maximized in regions of intermediate flow energy. KEY WORDS: Kelp · Nereocystis · Hydrodynamics · Population dynamics · Lacuna Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 223. Online publication date: November 28, 2001 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2001 Inter-Research." @default.
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- W2002026996 title "Interactive roles of mesograzers and current flow in survival of kelps" @default.
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