Browsing Biology Faculty Research, Publications and Presentations by Issue Date
Now showing items 1-20 of 185
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Circulation time, blood reserves and extracellular space in a cephalopod
Octopus vulgaris Cuvier has a fully enclosed blood system that includes large blood sinuses behind the eyes and around the gut. It would be useful to know the mean circulation time, the minimal number of heartbeats needed ... -
Invertebrate predation and lotic prey communities: Evaluation of in situ enclosure/exclosure experiments
The influence of the stonefly Kogotus nonus on prey communities was assessed by varying the predator density within small enclosures in a first-order stream in southwestern Alberta. Experimental containers with natural ... -
Entombed Plant-Communities Released by a Retreating Glacier at Central Ellesmere Island, Canada
No abstract available. -
Symmetry, change, perturbation, and observing mode in natural communities
Like a kaleidoscope, nature presents continuously fleeting images of natural communities. It has been difficult to discern patterns of community structure in these elusive images. For both theoretical and applied considerations, ... -
Survey of Vegetated Areas and Musk-Ox Populations in East-Central Ellesmere Island
No abstract available. -
Compartmental models of nitrogen cycling in tropical and temperate marine environments
Time-course measurements of super(15)N tracer kinetics in particulate organic and in NH super(+) sub(4) pools from tropical and temperate regions were used to test several compartmental models describing the exchange of ... -
The Forces Acting on Swimming Squid
1. Analysis of cine fils and intramantle pressure records for squid Loligo opalescens Berry swimming in a tunnel respirometer provided estimates of all the forces acting in the horizontal and vertical planes for swimming ... -
Nucleotide sequence, genomic organization and evolution of a major repetitive DNA family in tilapia (Oreochromis mossambicus/hornorum )
A highly repetitive DNA sequence from tilapia (Oreochromis mossambicus/hornorum ) has been cloned and sequenced. It is a tandemly arrayed sequence of 237 bp and constitutes 7% of the fish genome. The copy number of the ... -
Non-Occurrence of Free-Living Paramoeba-Invadens in Water and Sediments of Halifax Harbour Nova Scotia Canada
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
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 ... -
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Prey Exchange Rates and the Impact of Predators on Prey Populations in Streams
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
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
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
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
No abstract available.