POPULATION-DYNAMICS OF AN ASEXUAL BRINE SHRIMP ARTEMIA POPULATION

作     者：MACDONALD, GH BROWNE, RA 

作者机构：WAKE FOREST UNIV DEPT BIOL WINSTON SALEM NC 27109 USA SAMBUC BIOL TOUR VALAT STN ARLES FRANCE 

出 版 物：《JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY》 (实验海洋生物学与生态学杂志)

年 卷 期：1989年第133卷第3期

页      面：169-188页

核心收录：

学科分类：0710[理学-生物学] 07[理学] 071004[理学-水生生物学] 0713[理学-生态学] 

基　　金：Whitehall Foundation Tour du Valat, TdV 

主　　题：Artemia Asexuality Brine shrimp Parthenogenesis 

摘      要：An asexual population of brine shrimp Artemia parthenogenetica Barigozzi located in a commercial salina at Salin de Giraud, France, was sampled weekly during one growing season. A minimum of five generations is estimated to occur. Population levels increased rapidly through late March, then leveled at an approximate average density of 12,000 .cntdot. m-3 for the remainder of the growing season. Adults constituted 40% of the density but 95% of the standing crop (biomass) and calories. From 23 May to 5 June, four changes occurred in the population: (1) mean female fecundity decreased from 100 to 12 offspring .cntdot. brood-1, (2) size frequencies shifted, (3) adult density leveled and (4) a shift occurred from ovoviviparity to the production of encysted embryos. Salinities and population densities were estimated in late July for the numerous ponds that constitute the Salin de Giraud complex. Artemia were found in ponds ranging from 40 to ***. salt. Densities were positively correlated (P 0.001) to salinities between 40 and ***. but negatively correlated from 240 to ***.. Although the population is obligately asexual, nonfunctional rare males were found, with the male: female sex ratio peaking at 1:67.