Seasonal Variations in the Oceanography and Sediment Geochemistry in the Miramichi Estuary, New Brunswick- a Preliminary Report

1976 ◽  
Author(s):  
J D Willey
Keyword(s):  
New Brunswick ◽  
Seasonal Variations ◽  
Preliminary Report ◽  
Sediment Geochemistry

The biology of Unionicola formosa (Dana and Whelpley): a water mite parasitic in the unionid bivalve, Anodonta cataracta (Say), in a New Brunswick lake

1979 ◽  
Vol 57 (9) ◽  
pp. 1748-1756 ◽  
Author(s):  
M. J. Gordon ◽  
B. K. Swan ◽  
C. G. Paterson
Keyword(s):  
Life Cycle ◽  
Sex Ratio ◽  
New Brunswick ◽  
Seasonal Variations ◽  
The Other ◽  
Warm Water ◽  
Host Size ◽  
Water Mite ◽  
Mantle Tissue ◽  
Host Sex

The eggs, teleiochrysalis, and adults of the water mite Unionicola formosa (Dana and Whelpley) occur in Anodonta cataracta whereas only the egg stage is found in the other three unionid bivalves in Morice Lake, New Brunswick. There is no selectivity for host sex. Female mites do not reside in smaller bivalves. The incidence of infection and host loading increases with bivalve length. No evidence was found for territoriality of females within the host or for seasonal variations in abundance of either males or females. Only one male mite resides in each infected host. Incidence of infection increases with host size up to 5 cm and then remains stable at about 52%. A positive male–female association occurs during the warm water period but not after the water cools. The sex ratio is 1.60 females: 1 male. The teleiochrysalis occurs in the siphons during July at a density approximately 2.5 times that of the adults. Eggs are laid from late May until early July in the mantle tissue of most available hosts. The eggs hatch the following June and the larvae leave. Nymphs are found periodically except when teleiochrysalises are present. The available data suggest a 3-year life cycle for U. formosa.

Some Effects of Seasonal Changes in Dairy Herd Management upon Milk Yields

1954 ◽  
Vol 1954 ◽  
pp. 27-28
Author(s):  
A. W. A. Burt
Keyword(s):  
Milk Production ◽  
Seasonal Variations ◽  
Seasonal Changes ◽  
Preliminary Report ◽  
Dairy Herd ◽  
Seasonal Distribution ◽  
Potential Productivity ◽  
Herd Management

Seasonal variations in the milk production of a dairy herd are due to the seasonal distribution of calvings, to changes in the potential productivity of the herd due to effects of age, and to seasonal changes in the herd environment.This is a preliminary report of an attempt to estimate the effect of these seasonal changes in climate, feeding and management upon milk yields during single herd years, by making adjustments for the effects of the calving distribution and changes in potential productivity. Milk records from two Dairy Shorthorn herds were used.

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