Great Gordian knots: sex ratio and sexual size dimorphism in aggregations of horsehair worms (Gordius difficilis)

Philip A. Cochran; Andrew K. Newton; Clare Korte

doi:10.1111/j.1744-7410.2004.tb00143.x

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Philip A. Cochran,^1,* Andrew K. Newton,^1,** Clare Korte¹

¹Biology Department, Saint Mary's University, Winona, MN 55987, USA

^*Author for correspondence. E-mail: pcochran@smumn.edu
^**Present address: Department of Nuclear Medicine, Evanston Hospital, 2650 Ridge Avenue, Evanston, Illinois 60201, USA

Abstract

Large knots (> 100 individuals) of adult horsehair worms (Gordius difficilis) were collected in several spring-fed habitats in Wisconsin and Minnesota. These aggregations were dominated numerically by males. Although distributions of length and diameter of males and females overlapped, females tended to be significantly longer and wider than males. Moreover, at any given length, females were wider than males. These findings confirm and add statistical support to previously published reports.

Citation Download Citation

Philip A. Cochran, Andrew K. Newton, and Clare Korte "Great Gordian knots: sex ratio and sexual size dimorphism in aggregations of horsehair worms (Gordius difficilis)," Invertebrate Biology 123(1), 78-82, (31 December 2024). https://doi.org/10.1111/j.1744-7410.2004.tb00143.x

Published: 31 December 2024

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