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Titolo:
Does a negative genetic correlation between wing morph and early fecundityimply a functional constraint in Gryllus firmus?
Autore:
Stirling, G; Fairbairn, DJ; Jensen, S; Roff, DA;
Indirizzi:
McGill Univ, Dept Biol, Montreal, PQ H3A 1B1, Canada McGill Univ MontrealPQ Canada H3A 1B1 Biol, Montreal, PQ H3A 1B1, Canada Concordia Univ, Dept Biol, Montreal, PQ H3G 1M8, Canada Concordia Univ Montreal PQ Canada H3G 1M8 l, Montreal, PQ H3G 1M8, Canada McGill Univ, Dept Math & Stat, Montreal, PQ, Canada McGill Univ Montreal PQ Canada v, Dept Math & Stat, Montreal, PQ, Canada
Titolo Testata:
EVOLUTIONARY ECOLOGY RESEARCH
fascicolo: 2, volume: 3, anno: 2001,
pagine: 157 - 177
SICI:
1522-0613(200102)3:2<157:DANGCB>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRADE-OFF; SAND CRICKET; QUANTITATIVE GENETICS; REPRODUCTIVE EFFORT; MIGRATORY TENDENCY; DIMORPHIC CRICKET; THRESHOLD TRAITS; EVOLUTION; INSECTS; POLYMORPHISM;
Keywords:
correlated response; flight capability; insects; life-history trade-off; phenotypic costs;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Stirling, G McGill Univ, Dept Biol, 1205 Doctor Penfield Ave, Montreal, PQH3A 1B1, Canada McGill Univ 1205 Doctor Penfield Ave Montreal PQ Canada H3A 1B1
Citazione:
G. Stirling et al., "Does a negative genetic correlation between wing morph and early fecundityimply a functional constraint in Gryllus firmus?", EVOL EC RES, 3(2), 2001, pp. 157-177

Abstract

We tested the hypothesis that wing muscle size and triglyceride productionmediate a life-history trade-off between wing morph (or flight capability)and early fecundity. Roff et al. recently selected for lower number of eggs laid in the first week by Gryllus firmus (sand cricket) and reported a correlated increase in lone-winged (and presumably flight-capable) females, but did not test structural or energetic reproductive costs associated with flight capability. We used ovary weight of virgin crickets as an index of their early fecundity and dorsal longitudinal flight muscle (DLM) weight as a quantitative measure of flight muscle status. A preliminary experiment indicated that DLM weight is highly correlated with other measures of DLM status (colour, histolysis state, size). We used a haemolymph assay for acylglycerol concentration as an index of mobile triglyceride derivatives thoughtto provide energy for flight. Both DLM weight and acylglycerol concentration were negatively related to ovary weight of long-winged crickets, indicating wing muscle size and triglyceride concentrations mediate reproductive costs. In short-winged females, only DLM weight had a negative phenotypic relationship with ovary weight. The heritability of DLM weight and acylglycerol concentration are unknown, so we used the direction and size of standardized differences between base and selected populations to test whether DLM weight and acylglycerol concentration are negatively genetically correlatedwith ovary weight. Acylglycerol concentration and DLM weight increased in the population selected for low numbers of eggs laid within both wing morphs. Large standardized differences in short-winged females provide strong corroborative evidence of a genetic relationship between early fecundity and Right capability. These results indicate negative genetic correlations between wing morph and early fecundity reflect inherited variation in costs of early reproduction, related to physiological investment in flight capability (flight muscle size and triglyceride allocation), rather than being an arbitrary assumption of a life-history trade-off model.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/04/20 alle ore 22:55:09