Browsing Biology by Title
Now showing items 214-228 of 228
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Temperature-mediated outbreak dynamics of the invasive bryozoan Membranipora membranacea in Nova Scotian kelp beds
(2009)We used underwater videography to examine seasonal and interannual patterns in the cover (on kelp) of the encrusting epiphytic bryozoan Membranipora membranacea, and associated changes in the structure and abundance of ... -
Temporal and spatial variability in settlement and recruitment of echinoderms in kelp beds and barrens in Nova Scotia
(2000-10)Settlement and recruitment of echinoderms were measured in 2 adjacent habitats: a kelp bed (Laminaria longicruris) and an echinoid (Strongylocentrotus droebachiensis)-dominated barren ground at each of 2 sites in the ... -
Tidal and turbidity effects on the shallow-water fish assemblage of Kuwait Bay
(1990)Effects of location, diel period, tidal condition and water clarity on the size and distribution of the shallow water fish assemblage of the non-estuarine Kuwait Bay, were investigated using a beach seine and a small ... -
Top down and bottom-up regulation of phytoplankton assemblages in tidepools
(1996-12)We examined the relative importance of bottom-up (nutrient availability) and top-down (grazing) factors in regulating phytoplankton assemblages in tidepools on a rocky shore near Halifax, Nova Scotia, Canada. We manipulated ... -
Two centuries of multiple human impacts and successive changes in a North Atlantic food web
(2004-10)European colonization of North America, severely altered terrestrial and aquatic ecosystems alike. Here, we integrate archaeological, historical, and recent data to derive the ecological history of the Quoddy Region, Bay ... -
Unveiling Interactions among Mitochondria, Caspase-Like Proteases, and the Actin Cytoskeleton during Plant Programmed Cell Death (PCD)
(2013-03)Aponogeton madagascariensis produces perforations over its leaf surface via programmed cell death (PCD). PCD begins between longitudinal and transverse veins at the center of spaces regarded as areoles, and continues ... -
Variation in egg spawning among subpopulations of sea urchins Strongylocentrotus droebachiensis: a theoretical approach
(2001)Variation in zygote production, by determining the initial size of the larvalpool, can aff ect the population dynamics of marine invertebrates with a planktonic larval stage. In this paper, we model temporal and spatial ... -
Variation in milk production and lactation performance in grey seals and consequences for pup growth and weaning characteristics
(1999-12)Phocid seals are one of the few groups of mammals capable of sustaining the energetic demands of lactation entirely through body nutrient stores while fasting. Lactation performance of the female in turn influences the ... -
Variations in Sampling Procedure and Frequency Affect Estimates of Recruitment of Barnacles
(1993-09)The influence of variations in sampling procedure and frequency on estimates of recruitment of the barnacle Semibalanus balanoides (L.) on an intertidal rocky shore at Sandy Cove, Nova Scotia, Canada was determined from ... -
Water quality measurements on Williams Lake and Colpitt Lake (Halifax, N.S.) Dec 7-13, 2015 with reference to possible impacts of road salt
(Williams Lake Conservation Company, 2016-01-06)Concerns have been expressed by the Williams Lake Conservation Company (WLCC) about possible effects of renewed salting of roads close to Williams Lake on water quality of the lake. Such salting was replaced by sand and ... -
Weaning mass affects changes in body composition and food intake in harbour seal pups during the first month of independence
(2003-05)In phocid seals, the transition to nutritional independence is abrupt, with females abandoning their offspring after weaning and returning to sea. We hypothesized that body size at weaning may play an important role in ... -
What is a fish stock assessment? Is it a sound method? Can it be used to manage a commercial fishery?
(2015-09)Under Karl Popper's non-inductive theory of method arguments are never carried from data to advice as in a fish stock assessment. That is: a distinction or 'demarcation' has to be made between (i) a Lamarckian-like inductive ... -
Why an ecosystem approach is the wrong paradigm for the next stage of fisheries management
(2006-09-13)Scientists from the Department of Fisheries and Oceans (DFO) manage groundfish stocks by collecting biomass measurements that are used to provide scientific advice on catch limits. Clearly, if the data is uncertain or ... -
Why do fish stocks collapse? The example of cod in Atlantic Canada
(1997-02)In 1993, six Canadian populations of Atlantic cod (Gadus morhua) had collapsed to the point where a moratorium was declared on fishing. It has been argued that the collapses were caused by poor recruitment of cod to the ...