Adaptation to a novel environment is expected to have a number of features. Among these is a temporal increase in fitness and some or all of its components. It is also expected that additive genetic variances for these fitness characters will fall. Finally, it is expected that at least some additive genetic correlations will decrease, from positive toward negative values.
In a study of several life‐history variables in a Drosophila subobscura population sampled from the wild and then cultured in the laboratory, we did not find any such longitudinal trends over the first 29 generations. However, a temporal comparison (over 14 generations) of the later generations of this laboratory‐adapted population with a new population, derived from a more recent wild‐caught sample, indicated clearly that laboratory adaptation was nonetheless occurring. This study suggests the need for extensive replication and control in studies of the features of adaptation to a novel environment.
Bolseira da JNICT-PL2Mots-cJes : ile de Sao Tome, distribution geographique, sites et gites larvaires.Resume.-Etude preliminaire des Drosophilidae de l'ile de Sao Tome.-Les drosophilides de Sao Tome n'avaientjarnais fait ]'objet d'une etude faunistique et ecologique. La prospection de quarante-neuf localites, situees la plupart au niveau de la mer. a permis d' obtenir quarante-trois especes appartenant a huit genres (Cacoxenus, Leucophenga, Chymomyza, Drosophila, Microdrosophila, Mycodrosophila, Scaptomy::.a et Zaprionus). Vingt-sept especes, deja identifiees, sont rapportees pour la premiere fois de cette ile (a l'exception de Zaprionus campestris) : six Leucophenga, dix-huit Drosophila, un Microdrosophila et un Zaprionus. Des donnees pn5liminaires sur la distribution des especes, ainsi que sur leurs sites et gites larvaires, sont presentees.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.