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Sexual dimorphism and allometry in the sphecophilous rove beetle Triacrus dilatus.

Marlowe MH, Murphy CA, Chatzimanolis S - PeerJ (2015)

Bottom Line: Linear regressions were run to examine if there were significant relationships between the different measurements.Our results indicated that males had significantly larger mandibles and ocular distances than females, but the overall body length was not significantly different between the sexes.We found no evidence of major and minor forms in either sex.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Biological and Environmental Sciences, University of Tennessee at Chattanooga , Chattanooga, TN , USA.

ABSTRACT
The rove beetle Triacrus dilatus is found in the Atlantic forest of South America and lives in the refuse piles of the paper wasp Agelaia vicina. Adults of T. dilatus are among the largest rove beetles, frequently measuring over 3 cm, and exhibit remarkable variation in body size. To examine sexual dimorphism and allometric relationships we measured the length of the left mandible, ocular distance and elytra. We were interested in determining if there are quantifiable differences between sexes, if there are major and minor forms within each sex and if males exhibit mandibular allometry. For all variables, a t-test was run to determine if there were significant differences between the sexes. Linear regressions were run to examine if there were significant relationships between the different measurements. A heterogeneity of slopes test was used to determine if there were significant differences between males and females. Our results indicated that males had significantly larger mandibles and ocular distances than females, but the overall body length was not significantly different between the sexes. Unlike most insects, both sexes showed positive linear allometric relationships for mandible length and head size (as measured by the ocular distance). We found no evidence of major and minor forms in either sex.

No MeSH data available.


Related in: MedlinePlus

Means and SD of left mandible, ocular distance and elytra length, both male and female.Two-tailed T-tests were performed to determine significant differences between male and female for each variable: ns, no significant difference; ∗p < 0.05.
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fig-2: Means and SD of left mandible, ocular distance and elytra length, both male and female.Two-tailed T-tests were performed to determine significant differences between male and female for each variable: ns, no significant difference; ∗p < 0.05.

Mentions: T-test analyses indicated that males had significantly larger left mandibles and ocular distances than females (Left Mandible: t49 = − 2.65, p = 0.011; Ocular Distance: t49 = − 2.51, p = 0.015; Fig. 2). However, the elytra lengths of males and females were not significantly different from each other (t49 = − 1.62, p = 0.113; Fig. 3).


Sexual dimorphism and allometry in the sphecophilous rove beetle Triacrus dilatus.

Marlowe MH, Murphy CA, Chatzimanolis S - PeerJ (2015)

Means and SD of left mandible, ocular distance and elytra length, both male and female.Two-tailed T-tests were performed to determine significant differences between male and female for each variable: ns, no significant difference; ∗p < 0.05.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4525698&req=5

fig-2: Means and SD of left mandible, ocular distance and elytra length, both male and female.Two-tailed T-tests were performed to determine significant differences between male and female for each variable: ns, no significant difference; ∗p < 0.05.
Mentions: T-test analyses indicated that males had significantly larger left mandibles and ocular distances than females (Left Mandible: t49 = − 2.65, p = 0.011; Ocular Distance: t49 = − 2.51, p = 0.015; Fig. 2). However, the elytra lengths of males and females were not significantly different from each other (t49 = − 1.62, p = 0.113; Fig. 3).

Bottom Line: Linear regressions were run to examine if there were significant relationships between the different measurements.Our results indicated that males had significantly larger mandibles and ocular distances than females, but the overall body length was not significantly different between the sexes.We found no evidence of major and minor forms in either sex.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Biological and Environmental Sciences, University of Tennessee at Chattanooga , Chattanooga, TN , USA.

ABSTRACT
The rove beetle Triacrus dilatus is found in the Atlantic forest of South America and lives in the refuse piles of the paper wasp Agelaia vicina. Adults of T. dilatus are among the largest rove beetles, frequently measuring over 3 cm, and exhibit remarkable variation in body size. To examine sexual dimorphism and allometric relationships we measured the length of the left mandible, ocular distance and elytra. We were interested in determining if there are quantifiable differences between sexes, if there are major and minor forms within each sex and if males exhibit mandibular allometry. For all variables, a t-test was run to determine if there were significant differences between the sexes. Linear regressions were run to examine if there were significant relationships between the different measurements. A heterogeneity of slopes test was used to determine if there were significant differences between males and females. Our results indicated that males had significantly larger mandibles and ocular distances than females, but the overall body length was not significantly different between the sexes. Unlike most insects, both sexes showed positive linear allometric relationships for mandible length and head size (as measured by the ocular distance). We found no evidence of major and minor forms in either sex.

No MeSH data available.


Related in: MedlinePlus