QUICK SEARCH:   [advanced] Author: Keyword(s):
Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents

First published online May 18, 2006
Journal of Experimental Biology 209, 2076-2084 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02253

This Article Summary Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Lee, K. P. Articles by Simpson,, S. J. Search for Related Content PubMed PubMed Citation Articles by Lee, K. P. Articles by Simpson,, S. J.

Nutrient regulation in relation to diet breadth: a comparison of Heliothis sister species and a hybrid

Kwang Pum Lee^1,*, Spencer T. Behmer,^1,2 and Stephen J. Simpson,^1,3

¹ Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK
² Department of Entomology, Texas A&M University, College Station, TX 77843-2475, USA
³ School of Biological Sciences, University of Sydney, Heydon-Laurence Building, A08, NSW 2006, Australia

View larger version (21K): [in a new window]   Fig. 1. Bivariate means (±1 s.e.m.) of cumulative protein and carbohydrate consumed by HV, SV and HS caterpillars over the successive days during their entire final stadium in the choice test. The two dotted lines represent the protein:carbohydrate ratio of the two complementary foods (14:28 and 35:7 diets).

View larger version (12K): [in a new window]   Fig. 2. Means (±1 s.e.m.) of (A) stadium duration, (B) pupal dry mass of HV, SV and HS caterpillars in the choice test. Pupal mass was also adjusted for differences in initial fresh mass and demonstrated in (C) as the least square means (±1 s.e.m.) calculated from ANCOVA.

View larger version (18K): [in a new window]   Fig. 3. Cumulative protein and carbohydrate consumed by (A) HV, (B) SV and (C) HS over the successive days and across the full final stadium in the no-choice test. In each plot, dotted lines from left to right indicate the nutrient ratios for 7:35, 14:28, 21:21, 28:14 and 35:7 P:C diets where caterpillars were restricted, respectively. The mean protein-carbohydrate intakes up to days 1, 2, 3, 4, 5 and beyond (days 6-8) are represented as following symbols: circle, square, triangle, inverted triangle, diamond and hexagon, respectively. Within each time interval, the intake points are connected with solid line (the intake array) to demonstrate the pattern of nutrient balancing strategy. Broken lines stand for the self-selected composition of protein and carbohydrate by three genotypes (data adapted from Fig. 1).

View larger version (21K): [in a new window]   Fig. 4. Means (±1 s.e.m.) of (A) stadium duration, (B) pupal dry mass of HV, SV and HS caterpillars in the no-choice test.

View larger version (17K): [in a new window]   Fig. 5. Bivariate means (±1 s.e.m.) of pupal nitrogen and lipid mass accumulated through the insect's final larval stadium, denoted as nitrogen and lipid growth, in the choice test. Solid, broken and dotted lines depict the proportions of nitrogen to lipid growth for HV, SV and HS caterpillars in that order.

View larger version (15K): [in a new window]   Fig. 6. Utilization plots describing the bivariate means (±1 s.e.m.) of (A) nitrogen growth versus total nitrogen consumption and of (B) lipid growth versus total carbohydrate consumption in the no-choice test. Growth data presented for SV and HS caterpillars are corrected by multiplying the factor of 0.980 and 1.579 to each. This is done to account for their difference in initial fresh mass relative to HV caterpillars. In each genotype, the points from left to right are 7:35, 14:28, 21:21, 28:14 and 35:7 P:C diets for the nitrogen utilization plot, whereas such order is reversed for the lipid plot. Diamond symbols indicate the mean reference values for animals that are free to choose between 35:7 and 14:28 P:C diets (data adapted from Figs 1 and 5).