Erratum: Sex ratios of young-of-the-year walleye (Stizostedion vitreum) collected from lakes and rearing ponds of western Canada and northern United States

1991 ◽  
Vol 69 (4) ◽  
pp. 1133-1133
Author(s):  
C. L. Glenn ◽  
J. A. Mathias
Keyword(s):  
United States ◽  
Sex Ratios ◽  
Western Canada ◽  
Stizostedion Vitreum ◽  
Young Of The Year ◽  
Northern United States

Sex ratios of young-of-the-year walleye (Stizostedion vitreum) collected from lakes and rearing ponds of western Canada and northern United States

1988 ◽  
Vol 66 (8) ◽  
pp. 1772-1776
Author(s):  
C. L. Glenn ◽  
J. A. Mathias
Keyword(s):  
Sex Ratios ◽  
Western Canada ◽  
Stizostedion Vitreum ◽  
Individual Data ◽  
Large Lakes ◽  
Pond Size ◽  
Young Of The Year ◽  
Northern United States ◽  
The Individual ◽  
Stocking Rates

A total of 2682 young-of-the-year walleye (Stizostedion vitreum) were examined from 26 culture ponds and 5 large lakes to determine whether the sex ratio of cultured populations deviated from 1:1. Fingerlings from the lake populations were examined as a standard for comparison. Application of a χ2 test to pond data indicated that ponds, as a group, had significant deviations. Three of the ponds produced significantly more females and two of the ponds produced significantly more males. Neither the grouped nor the individual data from lakes produced sex ratios that deviated significantly from 1:1. Environmental factors such as pond size, depth, stocking rates, or time did not seem to influence sex determination.

Population fragmentation and inter-ecosystem movements of grizzly bears in western Canada and the northern United States

2011 ◽  
Vol 180 (1) ◽  
pp. 1-46 ◽  
Author(s):  
Michael F. Proctor ◽  
David Paetkau ◽  
Bruce N. Mclellan ◽  
Gordon B. Stenhouse ◽  
Katherine C. Kendall ◽  
...  
Keyword(s):  
United States ◽  
Grizzly Bears ◽  
Western Canada ◽  
Population Fragmentation ◽  
Northern United States

SEX REVERSAL IN OSTREA VIRGINICA

1932 ◽  
Vol 7 (1) ◽  
pp. 283-294 ◽  
Author(s):  
ALFREDA BERKELEY NEEDLER
Keyword(s):  
United States ◽  
Sex Ratios ◽  
Sex Reversal ◽  
Self Fertilization ◽  
Northern United States

By considering the sex ratios of Atlantic oysters of Canada and northern United States and by comparing these with the ages and average sizes of the oysters and with their degree of proximity to one another, the following conclusions are reached. The majority of oysters in any one population mature as males and later change to females. This change may be hastened by an environment favourable to growth or retarded by the proximity of older females. A marked oyster known to be male in 1930 was shown to be female in 1931. A few hermaphroditic oysters have been found. It was shown that self-fertilization in these is possible and it is believed that it may sometimes take place.

The North American Species in Group VII of Ips De Geer (Coleoptera: Scolytidae)

1965 ◽  
Vol 97 (2) ◽  
pp. 193-198 ◽  
Author(s):  
G. R. Hopping
Keyword(s):  
United States ◽  
New Species ◽  
North American ◽  
North American Species ◽  
The North ◽  
Northern United States

AbstractGroup VII of North American Ips contains I. thomasi, new species, I. borealis Swaine and I. swainei R. Hopping. They are less than 4.0 mm. long and females have the front of the head or at least the vertex smooth and shining, impunctate, or with very fine sparse punctures; males are more coarsely granulate-punctate on the frons. The species are described and a key is given. All breed in Picea in Canada and northern United States.

Sign in / Sign up

Export Citation Format

Share Document