Influence of temperature and food availability on the ecological energetics of the giant scallop Placopecten magellanicus. I. Growth rates of shell and somatic tissue

Abstract

Giant scallops Placopecten magellanicus (Gmelin) were collected at different water depths from locations in Newfoundland and New Brunswick. For various depths at 2 sites (Sunnyside and Colinet), monthly measurements were made for 2Y2 yr of water temperature, chlorophyll, energy content of seston, and size-frequency distribution of particulate matter. Somatic and shell growth rates for scallops from several sites in eastern Canada were compared using polynomial regression techniques and/or Von Bertalanffy equations. Faster shell growth and more pronounced somatic growth were recorded for populations growing under the more favourable conditions of food and temperature associated with shallow water, although localized conditions may obscure any general trend.

Influence of temperature and food availability on the ecological energetics of the giant scallop Placopecten magellanicus. II. Reproductive output and total production

“…Sampling schedules, locations of the various populations of Placopecten magellanicus and seasonal conditions of temperature and food availability were described in the preceding paper (MacDonald & Thompson 1985). Estimates of mean somatic weights and shell heights for each age class were provided by polynomial regression and Von Bertalanffy equations respectively (MacDonald & Thompson 1985).…”

“…Estimates of mean somatic weights and shell heights for each age class were provided by polynomial regression and Von Bertalanffy equations respectively (MacDonald & Thompson 1985). Increments in dry tissue weight (including the spent gonad), W, between consecutive year classes (W(,+,, -W,) were used to estimate annual production of somatic tissue (Pg) where 1 g dry weight = 24.5 kJ (Thompson 1977).…”

Impact of an exotic clam, Corbula gibba, on the commercial scallop Pecten fumatus in Port Phillip Bay, south-east Australia: evidence of resource-restricted growth in a subtidal environment

“…The quality and quantity of available food is one of the primary factors controlling growth and fecundity in pectinids (e.g. MacDonald & Thompson 1985, Pilditch & Grant 1999. Food limitation may therefore have a pronounced effect on size and growth.…”

Size-frequency distribution, growth, and mortality of snow crab (Chionoecetes opilio) and arctic lyre crab (Hyas coarctatus) in the chukchi sea from 2009 to 2013

“…The ACC had an average bottom water temperature of 2.55°C during the sampled summer month from 2009 to 2013, while the BSW flowing through the Central Channel had an average of −0.04°C and the BSW flowing around Hanna Shoal had average of −1.62°C (Groß, 2015). Bottom water temperatures have been assumed to play a substantial role in the latitudinal cline, as temperature affects growth and hence body size of organisms (MacDonald and Thompson, 1985;McCormick and Molony, 1995). Cold temperatures may be the greatest limitation on C. opilio population productivity, as it decreases growth, size-at-maturity, clutch size and slows egg development (Bryant, 1991;Burmeister and Sainte-Marie, 2010;Kolts et al, 2015;Orensanz et al, 2007).…”

“…Nevertheless, somatic growth is one of the most easily measured responses of organisms to environmental conditions because it is influenced by temperature, food availability and quality, water chemistry, biotic factors such as competition or diseases, and environmental stressors such as pollutants (Teissier, 1960). Specifically, temperature and food availability impact growth, and hence body size of invertebrates (MacDonald and Thompson, 1985). For example, SFD of C. opilio in Bonne Bay, Canada have been found to be related to water temperature (Comeau et al, 1998).…”