@article{markel_mechanisms_1998,
	title = {Mechanisms underlying the effect of the chiton {Katharina} tunicata on the kelp {Hedophyllum} sessile: size escapes and indirect effects},
	volume = {166},
	shorttitle = {Mechanisms underlying the effect of the chiton {Katharina} tunicata on the kelp {Hedophyllum} sessile: size escapes and indirect effects},
	doi = {10.3354/meps166151},
	abstract = {We monitored the population size-structure and demography of the intertidal kelp Hedophyllum sessile (C. Agardh) Setchell in areas of manipulated chiton Katharina tunicata (Wood) density to examine size-related 'escapes' and other mechanisms which may underlie the effects of this herbivore on H, sessile. This research was done on the west coast of Vancouver Island, British Columbia, Canada. We find that K. tunicata is associated with decreased juvenile H, sessile ({\textless}1 cm holdfast diameter) survivorship. While young adults of H, sessile (1-4 cm holdfast diameter) were found to survive significantly longer than juveniles between areas of low, control and high chiton density, adult ({\textgreater}4 cm holdfast diameter) survivorship did not differ among the density treatments. We argue that the mechanism underlying the effect of K, tunicata on young adult H. sessile survivorship is an indirect interaction wherein holdfast integrity is degraded, resulting in an increased susceptibility to wave-induced mortality. These findings provide a quantification of the mechanism of macrophyte size-escapes, may explain the geographically variable effects of K, tunica ta and bold implications for studies which aim to assess the effects of wave exposure on macrophyte survivorship.},
	journal = {Marine Ecology-Progress Series},
	author = {Markel, R. W. and DeWreede, R. E.},
	year = {1998},
	keywords = {Hedophyllum sessile},
	pages = {151--161},
}

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Agardh) Setchell in areas of manipulated chiton Katharina tunicata (Wood) density to examine size-related 'escapes' and other mechanisms which may underlie the effects of this herbivore on H, sessile. This research was done on the west coast of Vancouver Island, British Columbia, Canada. We find that K. tunicata is associated with decreased juvenile H, sessile (\\textless1 cm holdfast diameter) survivorship. While young adults of H, sessile (1-4 cm holdfast diameter) were found to survive significantly longer than juveniles between areas of low, control and high chiton density, adult (\\textgreater4 cm holdfast diameter) survivorship did not differ among the density treatments. We argue that the mechanism underlying the effect of K, tunicata on young adult H. sessile survivorship is an indirect interaction wherein holdfast integrity is degraded, resulting in an increased susceptibility to wave-induced mortality. 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