. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 1969 73% 1968 47% 1967 1966 100% FIGI'UK 1. The descent of the eight groups of Cccropia sihlings, line selected from the Urbana population for emergence with Group I, which emerged as adults in 107(1. On the left are the year ot emergence and the percentage ot the wild population which emerged with (iroup I in each year. A circle indicates a wild parent, a box the progeny resulting from a controlled mating. The upper figure in each box shows total progeny reared; the lower shows the percentage uhich emerged with (Imup I
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 1969 73% 1968 47% 1967 1966 100% FIGI'UK 1. The descent of the eight groups of Cccropia sihlings, line selected from the Urbana population for emergence with Group I, which emerged as adults in 107(1. On the left are the year ot emergence and the percentage ot the wild population which emerged with (iroup I in each year. A circle indicates a wild parent, a box the progeny resulting from a controlled mating. The upper figure in each box shows total progeny reared; the lower shows the percentage uhich emerged with (Imup I. Arrows show parentage; sex is indicated only where necessary. under large nylon mesh sleeves ( Telfer. 1()(>7) which covered entire apple trees ( Mains pnuiila ) and were securely tied shut at the base of the trunk. The trees were usually almost defoliated by the time the larvae became third instars; the larvae were then moved to fresh trees—about thirty to a net—where they usually managed to complete their growth without running short of food. In late summer or early fall the nets were removed and the cocoons were harvested. Maintenance of pupae Cocoons were kept in screened cages in a screened outdoor insectary at either Urbana or the Morton Arboretum, and were exposed only to natural photoperiods and temperatures. From late April to mid-July the cages were examined daily for newly emerged adults. The date of emergence and sex were noted except at the Morton Arboretum where sex was not noted. Reared animals were indoors only when mating and, or ovipositing. \Yild or reared cocoons were sometimes brought into the laboratory for a few hours for counting and sorting. The daily mean temperatures indicated on Figures 2—1 for Urbana were pro- vided by the Illinois State Water Survey. Daily means for the Morton Arboretum (Fig. 3 ) were calculated from daily maximum and minimum temperatures provided by the Environmental Data Service of the U. S. Department of Commerce. Sel
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
