caa a22 4500 388093323 CHVBK 20180307125257.0 cr unu---uuuuu 161130e199906 xx s 000 0 eng 10.4039/Ent131335-3 doi S0008347X00009950 pii (NATIONALLICENCE)cambridge-10.4039/Ent131335-3 Tourneur Jean-Claude Département des sciences biologiques, Université du Québec à Montréal, C.P. 8888, Succursale Centre-ville, Montréal, Québec, Canada H3C 3P8 POLYPLOIDY AND PREVITELLOGENIC FOLLICULAR ATRESIA DURING OOGENESIS IN THE EUROPEAN EARWIG FORFICULA AURICULARIA (DERMAPTERA: FORFICULIDAE) [Elektronische Daten] [Jean-Claude Tourneur] Growth, number of fusions, and polyploidy of ovarian trophocytes were studied in the European earwig, Forficula auricularia L., from the imaginal moult to oviposition, by examining sections of ovarioles and whole mounts of ovaries. During a reproductive cycle, the nucleus of the basal trophocyte enlarges its mean diameter from 5 to 170 ± 33 μm, successively absorbing the trophocyte nuclei of both adjacent follicles and undergoing seven endoreplications. The nucleus thus increased its DNA content 192 times, which is 66.7% more than in the artioploid type of polyploidy. However, vitellogenesis lasted about three times longer than previtellogenesis. This type of polyploidy accelerates oogenesis, allows an earlier oviposition, and may constitute an adaptation specific for the Montréal population of earwigs. Copyright © Entomological Society of Canada 1999 The Canadian Entomologist Cambridge University Press 131/3(1999-06), 335-345 0008-347X 131:3<335 1999 131 TCE https://doi.org/10.4039/Ent131335-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.4039/Ent131335-3 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Tourneur Jean-Claude Département des sciences biologiques, Université du Québec à Montréal, C.P. 8888, Succursale Centre-ville, Montréal, Québec, Canada H3C 3P8 NATIONALLICENCE 773 0- The Canadian Entomologist Cambridge University Press 131/3(1999-06), 335-345 0008-347X 131:3<335 1999 131 TCE CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge