caa a22 4500 469096454 CHVBK 20180323133032.0 cr unu---uuuuu 170328e19921101xx s 000 0 eng 10.1007/BF00317357 doi (NATIONALLICENCE)springer-10.1007/BF00317357 Facultative sex ratio shifts by a herbivorous insect in response to variation in host plant quality [Elektronische Daten] [Timothy Craig, Peter Price, Joanne Itami] Summary: We tested predictions of sex allocation theory with a series of field experiments on sex allocation in an herbivorous, haplodiploid, sawfly, Euura lasiolepis. Our experiments demonstrated the following points. 1) Adult females allocated progeny sex in response to plant growth. 2) Population sex ratios varied in response to plant quality, being male-biased where plant growth was slow and female-biased where plant growth was rapid. 3) Family sex ratios varied in response to plant quality, being male-biased on slow-growing plants and female-biased on rapidly-growing plants. 4) Female fitness increased more rapidly as the result of developing on more rapidly-growing plants than male mass. We conclude from these results that there are unequal returns on investment in male and female progeny. This results in facultatively biased sawfly sex ratios as an adaptive response to variation in plant quality. Springer-Verlag, 1992 Euura lasiolepis nationallicence Sawfly nationallicence Willow nationallicence Sex ratio nationallicence Plant quality hypothesis nationallicence Craig Timothy Life Sciences Program, Arizona State University West, 85069, Phoenix, AZ, USA aut Price Peter Department of Biological Sciences, Northern Arizona University, 86011, Flagstaff, AZ, USA aut Itami Joanne Life Sciences Program, Arizona State University West, 85069, Phoenix, AZ, USA aut Oecologia Springer-Verlag 92/2(1992-11-01), 153-161 0029-8549 92:2<153 1992 92 442 https://doi.org/10.1007/BF00317357 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00317357 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Craig Timothy Life Sciences Program, Arizona State University West, 85069, Phoenix, AZ, USA aut NATIONALLICENCE 700 1- Price Peter Department of Biological Sciences, Northern Arizona University, 86011, Flagstaff, AZ, USA aut NATIONALLICENCE 700 1- Itami Joanne Life Sciences Program, Arizona State University West, 85069, Phoenix, AZ, USA aut NATIONALLICENCE 773 0- Oecologia Springer-Verlag 92/2(1992-11-01), 153-161 0029-8549 92:2<153 1992 92 442 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer