Browsing Biology by Issue Date
Now showing items 21-40 of 228
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Non-Occurrence of Free-Living Paramoeba-Invadens in Water and Sediments of Halifax Harbour Nova Scotia Canada
(1989)Seawater and sediment samples from various sites in or near Halifax Harbour were cultured for Paramoeba as were tissues of the natural sea urchin host Stronglyocentrotus droebachiensis sampled from Halifax Harbour. An ... -
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. -
Prey Exchange Rates and the Impact of Predators on Prey Populations in Streams
(1990)We present four lines of evidence that the magnitude of prey exchange (=immigration/emigration) among substrate patches has an overwhelming influence on the perceived effects of predators on prey populations. (1) An extensive ... -
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 ... -
Effect of Boundary Layers on Cutaneous Gas Exchange
(1990)Boundary layers may offer significant resistance to cutaneous oxygen uptake by amphibians in water. This hypothesis was tested by measuring resistance to oxygen uptake as a function of water velocity in bullfrogs submerged ... -
Community Dynamics on a Subtidal Cobble Bed Following Mass Mortalities of Sea Urchins
(1990)The macrobenthic community of a shallow subtidal cobble bed at Eagle Head on the Atlantic coast of Nova Scotia [Canada] was monitored from ca 4 mo before to 41 mo after mass mortalities of sea urchins Strongylocentrotus ... -
Intense, Natural Pollution Affects Arctic Tundra Vegetation at the Smoking Hills, Canada
(1990-04)No abstract available. -
Patch Dynamics of a Phytophagous Mite Population Effect of Number of Subpopulations
(1991)I conducted a field test of the hypothesis that the dynamics of a predator-prey interaction should be affected by the number of interacting subpopulations within an assemblage. I used a "successful" biological control ... -
Seven case studies in sustainable agriculture
(Science Council of Canada, Ottawa, 1991-05-24)Seven case studies of SA (sustainable agriculture) in Canada were conducted in the late fall/early winter of 1990/91. The primary objective was to provide examples of innovative SA practices that have been implemented by ... -
Proceedings of the Bioregional Farmer/Scientist Workshop in Organic Agriculture (Maine & Maritime Provinces), 1988•
(Organic Crop Improvement Association of New Brunswick & Dalhousie University, 1991-06-15)Proceedings of a workshop -
The burrow microhabitat of the land crab Cardisoma guanhumi: Respiratory/ionic conditions and physiological responses of crabs to hypercapnia
(1993)Cardisoma guanhumi in Puerto Rico spend much of the dry season in burrows that descend to groundwater. Burrows are sometimes 3-4 m deep and may be capped with dried mud for over 3 mo. Samples of gas and water from burrows ... -
Community structure and organization of tidepools
(1993)Although tidepools are conspicuous components of rocky intertidal shores, their biotic communities have not been studied as extensively as those on emergent substrata. We examine processes regulating the structure of ... -
On-farm measurements of pH, electrical conductivity and nitrate in soil extracts for monitoring coupling and decoupling of nutrient cycles
(Biological Agriculture & Horticulture, 1993) -
Free-Space Availability and Larval Substratum Selection as Determinants of Barnacle Population-Structure in a Developing Rocky Intertidal Community
(1993-05)Variation in settlement and recruitment of the barnacle Semibalanus balanoides (L.) was experimentally investigated in the high, mid and low intertidal zones at 2 adjacent sites (A and B) on a rocky shore in Nova Scotia, ... -
Evaluation of low external input, sustainable farming practices for livestock farms in Cumberland County
(REAP-Cumberland, Shinimicas, Nova Scotia, 1993-06-01)Existing livestock systems in Cumberland Co. rely mainly on grass, clover and spring cereals for home grown forage and grain. There are well known limitations to these systems on the fragipan or basil till soils which ... -
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 ... -
Can SINEs: A family of tRNA-derived retroposons specific to the superfamily canoidea
(1994)A repetitive element of approximately 200 bp was cloned from harbour seal (Phoca vitulina concolour) genomic DNA. The sequence of the element revealed putative RNA polymerase III control boxes, a poly A tail and direct ... -
Oxygen transport in egg masses of the amphibians Rana sylvatica and Ambystoma maculatum: Convection, diffusion and oxygen production by algae
(1994)Many amphibians lay their eggs in gelatinous masses up to 10-20 cm in diameter, posing problems for diffusive oxygen delivery. Oxygen may also be provided by water convection between eggs or by oxygen production by endogenous ...