New Zealand Journal of Ecology 27: 67–73.īerkenbusch, K. Ecosystem engineering – moving away from ‘just-so’ stories. Population dynamics of the burrowing ghost shrimp Callianassa filholi on an intertidal sandflat in New Zealand (Decapoda : Thalassinidea). Progress in Underwater Science 9: 15–25.īerkenbusch, K. Resin casting: a technique of investigating burrows in sublittoral sediments. Estuarine Coastal and Shelf Science 44: 155–168.Ītkinson, R. Behavioural and physiological implications of a burrow-dwelling lifestyle for two species of upogebiid mud-shrimp (Crustacea: Thalassinidea). No evidence that the introduced parasite Orthione griffenis Markham, 2004 causes sex change or differential mortality in the native mud shrimp, Upogebia pugettensis (Dana, 1852). Food habits of estuarine staghorn sculpin, Leptocottus armatus, with focus on consumption of juvenile Dungeness crab, Cancer magister.
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Marine Ecology Progress Series 291: 159–168.Īrmstrong, J. Food sources of tropical thalassinidean shrimps: a stable-isotope study. These species population fluctuations mirrored those observed in density collected at discrete sampling locations over the same period, equate to large changes in secondary production, and have likely resulted in substantial changes to estuarine habitat and food webs.Ībed-Navandi, D. pugettensis in this estuary was less clear. Upogebia pugettensis had mostly disappeared from Willapa Bay by 2006 and declines were observed in Yaquina Bay, but the magnitude and long-term trajectory of U. Neotrypaea californiensis populations estimated from burrow counts collected using a gridded survey design across representative tide flats declined by 25% between 20 in Yaquina Bay, Oregon and by 67% in Willapa Bay, Washington from 2006 to 2011, but increased again in Willapa Bay by 2014. pugettensis, respectively) to permit population abundance estimates to be made over broad landscape scales. Since these shrimp construct deep burrows in the sediment, we quantified the relationship between burrow openings and shrimp density (1.5 and 1.7 burrow openings per shrimp for N. Temporal variation in the density and distribution of the burrowing shrimps, Neotrypaea californiensis and Upogebia pugettensis, were compared in two estuaries along the West coast of the United States (USA) where they are recognized as important ecosystem engineers.
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