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The effect of diet quality and wing morph on male and female reproductive investment in a nuptial feeding ground cricket.

Hall MD, Bussière LF, Brooks R - PLoS ONE (2008)

Bottom Line: In this species, both males and females make significant contributions to the production of offspring, as males provide a nuptial gift by allowing females to chew on a modified tibial spur during copulation and feed directing on their haemolymph.Individuals also have two distinct wing morphs, a short-winged flightless morph and a long-winged morph that has the ability to disperse.We discuss the broader implications of these findings including the differences in how males and females balance current and future reproductive effort in nuptial feeding insects, the changing nature of sexual selection when diets vary, and how the life-history trade-offs associated with the ability to disperse are expected to differ among populations.

View Article: PubMed Central - PubMed

Affiliation: Evolution & Ecology Research Centre and School of Biological, Earth & Environmental Sciences, University of New South Wales, Sydney, New South Wales, Australia. m.hall@student.unsw.edu.au

ABSTRACT
A common approach in the study of life-history trade-off evolution is to manipulate the nutrient content of diets during the life of an individual in order observe how the acquisition of resources influences the relationship between reproduction, lifespan and other life-history parameters such as dispersal. Here, we manipulate the quality of diet that replicate laboratory populations received as a thorough test of how diet quality influences the life-history trade-offs associated with reproductive investment in a nuptial feeding Australian ground cricket (Pteronemobius sp.). In this species, both males and females make significant contributions to the production of offspring, as males provide a nuptial gift by allowing females to chew on a modified tibial spur during copulation and feed directing on their haemolymph. Individuals also have two distinct wing morphs, a short-winged flightless morph and a long-winged morph that has the ability to disperse. By manipulating the quality of diet over seven generations, we found that the reproductive investment of males and females were affected differently by the diet quality treatment and wing morph of the individual. We discuss the broader implications of these findings including the differences in how males and females balance current and future reproductive effort in nuptial feeding insects, the changing nature of sexual selection when diets vary, and how the life-history trade-offs associated with the ability to disperse are expected to differ among populations.

Show MeSH
The effect of diet quality treatment and wing morph type on female reproductive investment.The means and standard errors for the diet treatment and wing morph factors are calculated based on the average values for each of the experimental populations.
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pone-0003437-g002: The effect of diet quality treatment and wing morph type on female reproductive investment.The means and standard errors for the diet treatment and wing morph factors are calculated based on the average values for each of the experimental populations.

Mentions: The results of the mixed model analyses of female reproductive investment are shown in Table 2, while the means are shown in Figure 2. We found that aspects of female reproductive investment differed significantly between the different diet quality treatments. Females from the high quality diet populations laid almost 45 percent more eggs in two weeks (Figure 2A) and had greater than 10 percent higher hatching success (Figure 2B) than females from the low quality diet populations. Females from the low quality populations, however, laid significantly larger eggs (Figure 2C). Moreover, there was no significant difference between the two treatments in female lifespan, as all females lived for approximately 60 days post eclosion (Figure 2D). For all traits measured there were no significant differences between the micropterous and macropterous individuals and there were no significant treatment by wing morph interactions.


The effect of diet quality and wing morph on male and female reproductive investment in a nuptial feeding ground cricket.

Hall MD, Bussière LF, Brooks R - PLoS ONE (2008)

The effect of diet quality treatment and wing morph type on female reproductive investment.The means and standard errors for the diet treatment and wing morph factors are calculated based on the average values for each of the experimental populations.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2562459&req=5

pone-0003437-g002: The effect of diet quality treatment and wing morph type on female reproductive investment.The means and standard errors for the diet treatment and wing morph factors are calculated based on the average values for each of the experimental populations.
Mentions: The results of the mixed model analyses of female reproductive investment are shown in Table 2, while the means are shown in Figure 2. We found that aspects of female reproductive investment differed significantly between the different diet quality treatments. Females from the high quality diet populations laid almost 45 percent more eggs in two weeks (Figure 2A) and had greater than 10 percent higher hatching success (Figure 2B) than females from the low quality diet populations. Females from the low quality populations, however, laid significantly larger eggs (Figure 2C). Moreover, there was no significant difference between the two treatments in female lifespan, as all females lived for approximately 60 days post eclosion (Figure 2D). For all traits measured there were no significant differences between the micropterous and macropterous individuals and there were no significant treatment by wing morph interactions.

Bottom Line: In this species, both males and females make significant contributions to the production of offspring, as males provide a nuptial gift by allowing females to chew on a modified tibial spur during copulation and feed directing on their haemolymph.Individuals also have two distinct wing morphs, a short-winged flightless morph and a long-winged morph that has the ability to disperse.We discuss the broader implications of these findings including the differences in how males and females balance current and future reproductive effort in nuptial feeding insects, the changing nature of sexual selection when diets vary, and how the life-history trade-offs associated with the ability to disperse are expected to differ among populations.

View Article: PubMed Central - PubMed

Affiliation: Evolution & Ecology Research Centre and School of Biological, Earth & Environmental Sciences, University of New South Wales, Sydney, New South Wales, Australia. m.hall@student.unsw.edu.au

ABSTRACT
A common approach in the study of life-history trade-off evolution is to manipulate the nutrient content of diets during the life of an individual in order observe how the acquisition of resources influences the relationship between reproduction, lifespan and other life-history parameters such as dispersal. Here, we manipulate the quality of diet that replicate laboratory populations received as a thorough test of how diet quality influences the life-history trade-offs associated with reproductive investment in a nuptial feeding Australian ground cricket (Pteronemobius sp.). In this species, both males and females make significant contributions to the production of offspring, as males provide a nuptial gift by allowing females to chew on a modified tibial spur during copulation and feed directing on their haemolymph. Individuals also have two distinct wing morphs, a short-winged flightless morph and a long-winged morph that has the ability to disperse. By manipulating the quality of diet over seven generations, we found that the reproductive investment of males and females were affected differently by the diet quality treatment and wing morph of the individual. We discuss the broader implications of these findings including the differences in how males and females balance current and future reproductive effort in nuptial feeding insects, the changing nature of sexual selection when diets vary, and how the life-history trade-offs associated with the ability to disperse are expected to differ among populations.

Show MeSH