SANDBERG, L. Anders, dir., Trouble in the Woods: Forest Policy and Social Conflict in Nova Scotia and New Brunswick. Fredericton, Acadiensis Press, 1992. vi-234 p. 19,95 $

Abstract Brook trout and yellow perch collected while surveying New Brunswick and Nova Scotia headwater lakes were analyzed for DDT metabolites, chlordane, hexacyclohexane isomers, hexachlorobenzene, toxaphene and PCB’s. Concentrations of DDT metabolites were much higher from fish taken from lakes in north-central N.B. (200-700 ng/g wet wt) than from fish taken elsewhere (<10 ng/g). Seventy to 90% of the DDT metabolites was DDE. Chlordane (3-13 ng/g) was analyzed in seven trout, six of them from central N.B. areas with intensive agriculture. Isomers of hexachlorocyclohexane were in highest concentration from north-central N.B. (10-20 ng/g), eastern N.S. (5-15 ng/g) and southern N.B. (5-20 ng/g). In most cases, alpha-hexachlorocyclohexane (lindane) was the isomer in highest concentration. Concentrations of hexachlorobenzene in fish tissues was highly variable with no obvious geographic bias. PCB’s were detected in very few fish, and no toxaphene was detected.

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Pollen evidence for the postglacial origins of Nova Scotia's forests

Canadian Journal of Botany ◽

10.1139/b87-163 ◽

1987 ◽

Vol 65 (6) ◽

pp. 1163-1179 ◽

Cited By ~ 32

Author(s):

David G. Green

Keyword(s):

Nova Scotia ◽

New Brunswick ◽

New England ◽

Ice Sheets ◽

Arrival Times ◽

Local Environments ◽

Pollen Diagrams ◽

Propagule Dispersal ◽

Coastal Shelf ◽

Maritime Canada

Pollen diagrams from sites in southwest Nova Scotia and close to the New Brunswick – Nova Scotia border show that after retreat of the Wisconsin ice sheets, most tree taxa arrived in the extreme southwest of Nova Scotia earlier than anywhere else in the province. For most tree taxa, arrival times at sites in maritime Canada and in northeastern New England are consistent with very early dispersal of individuals along the coastal strip via the exposed coastal shelf and with their entering Nova Scotia from the southwest. These scattered pioneer populations acted as centres for major population expansions, which followed much later in some cases. Local environments, fire, and interspecies competition appear to have been more important than propagule dispersal rates as factors limiting the spread of most taxa.

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PREDATION BY INSECTS AND SPIDERS INHABITING COLONIAL WEBS OF HYPHANTRIA CUNEA

The Canadian Entomologist ◽

10.4039/ent1041197-8 ◽

1972 ◽

Vol 104 (8) ◽

pp. 1197-1207 ◽

Cited By ~ 18

Author(s):

R. F. Morris

Keyword(s):

Population Dynamics ◽

Nova Scotia ◽

North America ◽

Population Density ◽

New Brunswick ◽

Numerical Response ◽

Initial Number ◽

Hyphantria Cunea ◽

The North ◽

The Mean

AbstractThe number of predators inhabiting nests of Hyphantria cunea Drury was recorded annually for 13 years in four areas in New Brunswick and two areas on the coast of Nova Scotia. The most common groups were the pentatomids and spiders, which sometimes reproduced within the nests, but the mean number per nest was low in relation to the number of H. cunea larvae in the colonies. The rate of predation on fifth-instar larvae was low. Small or timid predators appeared to prey largely on moribund larvae or small saprophagans during the principal defoliating instars of H. cunea.No relationship could be detected between the number of larvae reaching the fifth instar and the number of predators in the colony; nor could any functional or numerical response of the predators to either the initial number of larvae per colony or the population density of colonies be found. It is concluded that the influence of the nest-inhabiting predators is small and relatively stable, and may be treated as a constant in the development of models to explain the population dynamics of H. cunea.H. cunea is a pest in parts of Europe and Asia, where it has been accidentally introduced from North America. The introduction to other continents of the North American predator, Podisus maculiventiis (Say), is discussed briefly.

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