|Molluscan ResearchISSN 1323-5818|
international journal of the Malacological
Society of Australasia and
the Society for the Study of Molluscan Diversity published by Magnolia Press
Molluscan Research 31(3):
183-188; published 30 Nov. 2011
Copyright © The Malacological Society of Australasia & the Society for the Study of Molluscan Diversity
Growth, population dynamics and morphometrics of Pinna bicolor (Gmelin, 1791) in Lake Macquarie, New South Wales, Australia
JAMES R. BURNS1 & STEPHEN D. A. SMITH2
1School of Environmental and Rural Science, University of New England, Armidale, NSW 2351.
2National Marine Science Centre, Southern Cross University, PO Box 4321, Coffs Harbour, NSW 2450
Corresponding author—Email: firstname.lastname@example.org
Anecdotal reports suggest that populations of razor clams, Pinna bicolor, have increased substantially in Lake Macquarie, New South Wales over the last 5-10 years. This has raised concerns about the ecology of the Lake and human safety. As a first step to providing information to inform management, between August 2009 and August 2010, we examined growth, population density, recruitment and the morphometrics of marked razor clams in a permanently marked grid in the southern reaches of the Lake. Growth increments of 61 P. bicolor were used to construct a Ford-Walford plot, from which von Bertalanffy growth parameters were calculated (K = 0.409 and L∞ (dorso-ventral measurement) = 235.192 mm). During the study period 24 P. bicolor recruited to the grid, increasing the population density from 0.15 m-2 to 0.20 m-2. Recruits ranged in size (antero-posterior measurement) from 177–241 mm, with a mean (± SE) of 215.4 ± 4.1 mm. Morphological variation was observed and was evident within the linear regression of shell length on shell height (r2 = 0.631). These observations confirmed that growth, density and recruitment, as well as the degree of morphological variation within a population of P. bicolor in the warm temperate waters of New South Wales, is similar to that recorded for populations in South Australia and Western Australia.
Additional key words: bivalve, razor clam, Bivalvia, Pinnidae, von Bertalanffy, ecology
|Copyright © 2005-2011 Magnolia Press||Published : 30 Nov. 2011|