Andrea Locke

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A freshwater headpond was created in 1968 when a causeway was builtacross a tidal portion of the Petitcodiac River, New Brunswick, Canada. In the32-year history of this tidal barrier, there have been numerous water-leveldrawdowns to manage risk of flooding (relatively minor and of short duration)and to permit passage of anadromous fishes past the dam(More)
BACKGROUND Cells within tissues are subjected to mechanical forces caused by extracellular matrix deformation. Cells sense and dynamically respond to stretching of the matrix by reorienting their actin stress fibers and by activating intracellular signaling proteins, including focal adhesion kinase (FAK) and the mitogen-activated proteins kinases (MAPKs).(More)
Styela plicata (Lesueur, 1823) is a solitary ascidian found in shallow, protected environments in tropical and warm-temperate oceans. Its origin is uncertain, given that it has already been identified in several oceans since it was first described, showing a very broad geographical distribution. Although S. plicata has been historically classified as a(More)
The effects of pH, algal composition and algal biomass on abundance, size, reproduction and condition of Daphnia pulex and Bosmina longirostris were tested in a field experiment using water and natural phytoplankton assemblages from a circumneutral (pH 6.43) and a moderately acidic (pH 5.75) lake in south-central Ontario. Both species were affected by pH(More)
Invasive green crab populations initially established in Canada within the Bay of Fundy, New Brunswick in the 1950s and were present in all five Atlantic provinces by 2007. Genetic evidence suggests that the Atlantic Canadian populations originated from two separate introductions with differences in time of establishment among regions and possible(More)
The upper estuary of the macrotidal Petitcodiac River, New Brunswick, Canada, was converted to a freshwater impoundment by construction of a causeway in 1968. Thirty years later, zooplankton community structure in the impoundment was characteristic of a disturbed ecosystem. The depauperate zooplankton consisted of a mixture of freshwater and marine/brackish(More)
We collected zooplankton samples from 4×4 m enclosures located in two acidified lakes (pH<5) in Nova Scotia from June to August 1996. One lake had mean dissolved organic carbon concentrations greater than 10 mg l−1 (brown water), while the other had values between 2 and 4 mg l−1. In each lake, three enclosures were open to ambient light, while three were(More)
probability of eradication of aquatic non-indigenous species David Drolet*, Andrea Locke, Mark A. Lewis and Jeff Davidson Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, PE C1A 4P3, Canada; Science Branch, Department of Fisheries and Oceans Canada, Gulf Fisheries Centre,(More)
We investigated spatial distribution of fishes and decapods in eelgrass (Zostera marina L.) and non-vegetated sandy habitats in Kouchibouguac Estuary, New Brunswick, Canada. During the ice-free season in 1999 and 2000, mobile fauna were sampled using fyke nets, minnow traps and an epibenthic sled. In general, fishes and decapods were more abundant and(More)
The main objective of evidence-based management is to promote use of scientific data in the decision-making process of managers, with data either complementing or replacing expert knowledge. It is expected that this will increase the efficiency of environmental interventions. However, the relative accuracy and precision of evidence-based tools and expert(More)