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Marine Ecology Progress Series

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MEPS 646:79-92 (2020)  -  DOI:

Persistence of giants: population dynamics of the limpet Scutellastra laticostata on rocky shores in Western Australia

Robert E. Scheibling1,*,#, Robert Black2,#

1Department of Biology, Dalhousie University, Halifax, NS B3H 4R2, Canada
2School of Biological Sciences, University of Western Australia, Crawley, WA 6009, Australia
*Corresponding author:
#Both authors contributed equally to this work

ABSTRACT: Population dynamics and life history traits of the ‘giant’ limpet Scutellastra laticostata on intertidal limestone platforms at Rottnest Island, Western Australia, were recorded by interannual (January/February) monitoring of limpet density and size structure, and relocation of marked individuals, at 3 locations over periods of 13-16 yr between 1993 and 2020. Limpet densities ranged from 4 to 9 ind. m-2 on wave-swept seaward margins of platforms at 2 locations and on a rocky notch at the landward margin of the platform at a third. Juvenile recruits (25-55 mm shell length) were present each year, usually at low densities (<1 m-2), but localized pulses of recruitment occurred in some years. Annual survival rates of marked limpets varied among sites and cohorts, ranging from 0.42 yr-1 at the notch to 0.79 and 0.87 yr-1 on the platforms. A mass mortality of limpets on the platforms occurred in 2003, likely mediated by thermal stress during daytime low tides, coincident with high air temperatures and calm seas. Juveniles grew rapidly to adult size within 2 yr. Asymptotic size (L, von Bertalanffy growth model) ranged from 89 to 97 mm, and maximum size from 100 to 113 mm, on platforms. Growth rate and maximum size were lower on the notch. Our empirical observations and simulation models suggest that these populations are relatively stable on a decadal time scale. The frequency and magnitude of recruitment pulses and high rate of adult survival provide considerable inertia, enabling persistence of these populations in the face of sporadic climatic extremes.

KEY WORDS: Giant limpets · Population dynamics · Growth · Survival · Rocky intertidal zone · Scutellastra laticostata

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Cite this article as: Scheibling RE, Black R (2020) Persistence of giants: population dynamics of the limpet Scutellastra laticostata on rocky shores in Western Australia. Mar Ecol Prog Ser 646:79-92.

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