Browsing Biology by Title
Now showing items 173-192 of 228
-
Reflections on the failure of traditional fisheries management
(2016-06-03)A traditional fisheries management or fish stock assessment takes a Lamarckian-like instructive view of fisheries science. Its invalid inductive arguments have no problem solving capacity and are responsible for the collapse ... -
Refuge dynamics and metapopulation dynamics: An experimental test
(1996-03)Red scale, an insect pest of citrus, is under control by the parasitoid Aphytis melinus in many areas, and in our study area the interaction appears dynamically stable. The bark on the interior branches and trunk of trees ... -
A Refuge for Red Scale the Role of Size-Selectivity by a Parasitoid Wasp
(1989)The presence of a physical refuge (an area where mortality due to parasitism is very low) has been demonstrated for California red scale, a pest of citrus. Density of red scale is very high, and parasitism by the principal ... -
A Refuge for Red Scale Under Control by Aphytis - Structural Aspects
(1989-12)No abstract available. -
Regeneration of Forest and Barrens after the Spryfield Fire
(2010-09-02)This set of annotated photos illustrates the regeneration of vegetation over 16 months after an intense fire that swept through forest and barrens in the vicinity of Spryfield, Nova Scotia on April 30/May 1 of 2009. The ... -
Regional-scale effects of eutrophication on ecosystem structure and services of seagrass beds
(2012-09)Using large-scale field surveys across 12 estuaries in two provinces in Atlantic Canada, we analyzed changes in phytoplankton and benthic macroalgal communities as well as the canopy structure of eelgrass beds and quantified ... -
Regulation of an Insect Population Under Biological-Control
(1995-01)California red scale is suppressed to very low densities by the parasitoid Aphytis melinus. The system also appears stable. We report on an experimental test of the hypothesis that stability is caused by a refuge for scale. ... -
The relationship between offspring size and fitness: integrating theory and empiricism
(2013-02)How parents divide the energy available for reproduction between size and number of offspring has a profound effect on parental reproductive success. Theory indicates that the relationship between offspring size and ... -
Relative risks of inbreeding and outbreeding depression in the wild in endangered salmon
(2011-09)Conservation biologists routinely face the dilemma of keeping small, fragmented populations isolated, wherein inbreeding depression may ensue, or mixing such populations, which may exacerbate population declines via ... -
Repeatability in lactation performance and the consequences for maternal reproductive success in gray seals
(2009-09)In mammals, the most significant maternal effect on offspring growth during lactation is the ability of females to efficiently transfer milk energy to their neonates. However, despite the importance of the transfer of ... -
The respiratory development of Atlantic salmon .1. Morphometry of gills, yolk sac and body surface
(1996-12)During development from larva to juvenile in Atlantic salmon, Salmo salar, there is a change in the anatomical potential for gas exchange among gills, body skin and yolk sac as the larvae resorb yolk, grow and develop ... -
The respiratory development of Atlantic salmon: II. Partitioning of oxygen uptake among gills, yolk sac and body surfaces
(1996)During post-hatch development of Atlantic salmon (Salmo salar L.), O-2 uptake partitioning changes from primarily cutaneous to primarily branchial. Over 80% of post-hatch O-2 uptake was cutaneous, with the yolk sac responsible ... -
Response: on the consequences of sexual selection for fisheries-induced evolution
(2008-11)No abstract available. -
The role of development, parental behavior, and nestmate competition in fledging of nestling Tree Swallows
(2000-10)Fledging (i.e. leaving the nest) in altricial birds is a major step toward independence. The timing of this important event may be influenced by nestling development, parental behavior, and sibling interactions. In this ... -
Role of early post-settlement mortality in recruitment of benthic marine invertebrates
(1997-08)Newly settled invertebrates usually are subject to high rates of mortality (Type III survivorship). Therefore, knowledge of early post-settlement events is critical in determining if and when patterns of abundance and ... -
Role of grazing by sea urchins Strongylocentrotus droebachiensis in regulating the invasive alga Codium fragile ssp tomentosoides in Nova Scotia
(2005)To assess the potential of herbivory in regulating the invasive green alga Codium fragile ssp. tomentosoides, field and laboratory experiments were conducted with the green sea urchin Strongylocentrotus droebachiensis ... -
Salt marshes in Nova Scotia: a status report of the Saltmarsh Working Group
(Institute of Resource and Environmental Studies and Department of Biology, Dalhousie University, 1981-06-01)There are approximately 80,000 acres of salt marsh land in Nova Scotia of which approximately 43,000 acres have been dyked for agricultural use. Salt marsh lands have served as major producers of food in estuarine regions. ... -
Scientific parameterization and its validation: comparing the universal models of fisheries economics with the invalid modeling of stock assessment
(2008-09-22)Here I compare the valid parameterization of fisheries economics with the data-fitted parameters of a stock assessment’s modeling, invalid models whose predictions cannot be falsified (which is another way of saying ... -
Seasonal and Age-Dependent Dietary Partitioning between the Great Black-Backed and Herring Gulls
(2011-11)Studies of seabird diets may reveal subtle ways in which sympatric species partition resources to facilitate co-existence. We studied the variability and partitioning of diets between the Herring (Larus argentatus) and ... -
Seasonal changes in buoyancy and diving behaviour of adult grey seals
(2000-08)Phocid seals go through dramatic seasonal changes in body mass and composition as a result of the spatial and temporal separation of foraging, reproduction and moulting. These changes in body fat content and body mass ...