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On Variation of Polyandry in a Bush-Cricket, Metrioptera roeselii , in Northern Europe

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ABSTRACT

Patterns of polyandry in nuptial-gift-giving insects are often explained in terms of sexually antagonistic coevolution. However, the potential influence of environmental constraints and life-history traits on polyandry in these species is still largely unexplored. As an initial step in examining the role of these factors, this study measured the number of matings (spermatodoses per female) of female Roesel's bush-crickets, Metrioptera roeselii Hagenbach (Orthoptera: Tettigoniidae), along a latitudinal gradient in northern Europe (16 sites, 53.89–60.47° N). Females contained between 0 and 5 spermatodoses (mean ± SE: 1.7 ± 0.08; N = 114), with the degree of polyandry generally increasing at higher latitudes (approximately 0.12–0.3 matings per degree of latitude). As expected, female body size also had an influence on polyandry; the number of matings increased from small to moderately large individuals before declining. The field-based results suggested that there were potentially interesting interactions between environment, life-history traits, and patterns of polyandry in nuptial-gift-giving insect species, and these potentially interesting interactions are used to outline future research directions.

No MeSH data available.


Number of spermatodoses per adult female (mean ± SE) relative to body size (femur length in mm) with the effects of latitude held constant. The raw data are clumped into 12 categories to aid visual representation. The prediction line is derived from the AIC-weighted model-averaged parameter estimates in Table 2. High quality figures are available online.
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f04_01: Number of spermatodoses per adult female (mean ± SE) relative to body size (femur length in mm) with the effects of latitude held constant. The raw data are clumped into 12 categories to aid visual representation. The prediction line is derived from the AIC-weighted model-averaged parameter estimates in Table 2. High quality figures are available online.

Mentions: There was also support for a relationship between female body size and the number of spermatodoses per female (Table 2; Figure 4). The highest number of spermatodoses were found in crickets of intermediate size (∼15–17 mm; Figure 4), with there being stronger support for models that included a quadratic term in addition to a simple linear term (from highest-ranked model in Table 2; log (spermatodoses) = 2.96 ± 1.38 * femur length (mm) - 0.087 ± 0.04 * femur length2).


On Variation of Polyandry in a Bush-Cricket, Metrioptera roeselii , in Northern Europe
Number of spermatodoses per adult female (mean ± SE) relative to body size (femur length in mm) with the effects of latitude held constant. The raw data are clumped into 12 categories to aid visual representation. The prediction line is derived from the AIC-weighted model-averaged parameter estimates in Table 2. High quality figures are available online.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3735106&req=5

f04_01: Number of spermatodoses per adult female (mean ± SE) relative to body size (femur length in mm) with the effects of latitude held constant. The raw data are clumped into 12 categories to aid visual representation. The prediction line is derived from the AIC-weighted model-averaged parameter estimates in Table 2. High quality figures are available online.
Mentions: There was also support for a relationship between female body size and the number of spermatodoses per female (Table 2; Figure 4). The highest number of spermatodoses were found in crickets of intermediate size (∼15–17 mm; Figure 4), with there being stronger support for models that included a quadratic term in addition to a simple linear term (from highest-ranked model in Table 2; log (spermatodoses) = 2.96 ± 1.38 * femur length (mm) - 0.087 ± 0.04 * femur length2).

View Article: PubMed Central

ABSTRACT

Patterns of polyandry in nuptial-gift-giving insects are often explained in terms of sexually antagonistic coevolution. However, the potential influence of environmental constraints and life-history traits on polyandry in these species is still largely unexplored. As an initial step in examining the role of these factors, this study measured the number of matings (spermatodoses per female) of female Roesel's bush-crickets, Metrioptera roeselii Hagenbach (Orthoptera: Tettigoniidae), along a latitudinal gradient in northern Europe (16 sites, 53.89–60.47° N). Females contained between 0 and 5 spermatodoses (mean ± SE: 1.7 ± 0.08; N = 114), with the degree of polyandry generally increasing at higher latitudes (approximately 0.12–0.3 matings per degree of latitude). As expected, female body size also had an influence on polyandry; the number of matings increased from small to moderately large individuals before declining. The field-based results suggested that there were potentially interesting interactions between environment, life-history traits, and patterns of polyandry in nuptial-gift-giving insect species, and these potentially interesting interactions are used to outline future research directions.

No MeSH data available.