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Divergence of Demographic and Reproductive Variables Over 25 Years in Laboratory and Natural Populations of the Brine Shrimp, Artemia

Divergence of Demographic and Reproductive Variables Over 25 Years in Laboratory and Natural... DIVERGENCE OF DEMOGRAPHIC AND REPRODUCTIVE VARIABLES OVER 25 YEARS IN LABORATORY AND NATURAL POPULATIONS OF THE BRINE SHRIMP, ARTEMIA BY ROBERT A. BROWNE Biology Department, Wake Forest University, Winston-Salem, N.C. 27109, U.S.A. INTRODUCTION Selection in natural populations due to man-induced alterations in the environment has been well-documented; e.g., industrial melanism (Kettlewell, 1973; Ford, 1971), insecticide resistance (reviewed by Brown, 1967 and Georghiou, 1972) and heavy metal tolerance by plants (Antonovics et al., 1971; Bradshaw, 1971). Selection in laboratory populations has also been demonstrated repeatedly, perhaps foremost in Drosophila (Dobzhansky & Spassky, 1947; Dobzhansky, 1970) and Tribolium (King & Dawson, 1972; Sonleitner, 1961). Many of the laboratory experiments, however, have been conducted over short time periods under extreme selective pressures. This paper reports the effects of long-term laboratory culturing under a less severe, unintentional, selective regime. Life-span and reproductive parameters are presented for two populations of the brine shrimp, Artemia: one raised under laboratory conditions for 25 years, the other its naturally occurring counter- part. MATERIALS AND METHODS In early 1980, two populations of San Francisco Bay brine shrimp (Artemia franciscana Kellogg, formerly A. salina (L., 1758); see Bowen et al., 1980 for tax- onomic review) were compared with http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Crustaceana Brill

Divergence of Demographic and Reproductive Variables Over 25 Years in Laboratory and Natural Populations of the Brine Shrimp, Artemia

Crustaceana , Volume 45 (2): 164 – Jan 1, 1983

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Publisher
Brill
Copyright
© 1983 Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0011-216x
eISSN
1568-5403
DOI
10.1163/156854083X00587
Publisher site
See Article on Publisher Site

Abstract

DIVERGENCE OF DEMOGRAPHIC AND REPRODUCTIVE VARIABLES OVER 25 YEARS IN LABORATORY AND NATURAL POPULATIONS OF THE BRINE SHRIMP, ARTEMIA BY ROBERT A. BROWNE Biology Department, Wake Forest University, Winston-Salem, N.C. 27109, U.S.A. INTRODUCTION Selection in natural populations due to man-induced alterations in the environment has been well-documented; e.g., industrial melanism (Kettlewell, 1973; Ford, 1971), insecticide resistance (reviewed by Brown, 1967 and Georghiou, 1972) and heavy metal tolerance by plants (Antonovics et al., 1971; Bradshaw, 1971). Selection in laboratory populations has also been demonstrated repeatedly, perhaps foremost in Drosophila (Dobzhansky & Spassky, 1947; Dobzhansky, 1970) and Tribolium (King & Dawson, 1972; Sonleitner, 1961). Many of the laboratory experiments, however, have been conducted over short time periods under extreme selective pressures. This paper reports the effects of long-term laboratory culturing under a less severe, unintentional, selective regime. Life-span and reproductive parameters are presented for two populations of the brine shrimp, Artemia: one raised under laboratory conditions for 25 years, the other its naturally occurring counter- part. MATERIALS AND METHODS In early 1980, two populations of San Francisco Bay brine shrimp (Artemia franciscana Kellogg, formerly A. salina (L., 1758); see Bowen et al., 1980 for tax- onomic review) were compared with

Journal

CrustaceanaBrill

Published: Jan 1, 1983

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