Ostergaard, P; Boxshall, GA; Quicke, DLJ
(2005)
Dwarfs or giants? Sexual size dimorphism in Chondracanthidae (Copepoda, Poecilostomatoida).
CRUSTACEANA, 78 (4).
397 - 408.
ISSN 0011-216X
https://doi.org/10.1163/1568540054473530
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Abstract
Abstract in English: Sexual size dimorphism in the Chondracanthidae is very marked: whether it is a consequence of males being dwarfs or females becoming giants is investigated. Chondracanthid females are between two and 30 times larger than their conspecific males. Plotting contrasts in male
size against female size and vice versa lead to opposing results, namely that the relationship between male and female size is allometric in the first instance and isometric in the second. Based on the results of an analysis of sexual size dimorphism against morphological distance, although not significant when phylogeny is controlled for, we argue that the relationship
between males and females might be allometric, i.e. showing a trend towards increasing sexual size dimorphism. Both sexes show changes in size compared with free-living forms,
indicating that changes in sexual size dimorphism are not limited to one sex. Chondracanthid females are probably selected for high fecundity leading to large body size, whereas males are probably selected for small size. If the male receives nutrients from the female, a small male
is less drain on the female's resources, which leaves more energy that can be allocated into egg production. Our data suggest that chondracanthid males are dwarfs and that
chondracanthid females are giants. Abstract in French: Le dimorphisme sexuel concernant la taille chez les Chondracanthidae est très marqué : nous avons recherché si ce dimorphisme s'expliquait par des mâles devenant nains ou des femelles devenant géantes. La comparaison de la taille du mâle par rapport à celle de la femelle indique que leur relation est allométrique, montrant une tendance vers l'augmentation du dimorphisme sexuel de la taille. Ceci est soutenu par les résultats de l'analyse du dimorphisme sexuel de la taille par rapport à la distance morphologique, bien que non significatifs quand on considère la phylogénie. Il apparaît que les deux sexes sont impliqués dans l'acquisition du dimorphisme sexuel relatif à la taille ; la sélection chez les Chondracanthidae femelles en vue d'une fécondité élevée a abouti à une grande taille du corps, tandis que chez les mâles, la sélection a probablement conduit vers une petite taille.
Item Type: |
Article
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Additional Information: |
Accepted version made available by permission of the publisher, Brill. |
Keywords: |
Science & Technology, Life Sciences & Biomedicine, Marine & Freshwater Biology, MARINE & FRESHWATER BIOLOGY, BODY-SIZE, CLUTCH SIZE, EVOLUTION, ALLOMETRY, SELECTION, FEMALES, MALES, Marine Biology & Hydrobiology, 0608 Zoology |
SGUL Research Institute / Research Centre: |
?? div_bio_sci ?? |
Journal or Publication Title: |
CRUSTACEANA |
ISSN: |
0011-216X |
Related URLs: |
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Dates: |
Date | Event |
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1 April 2005 | Published |
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Web of Science ID: |
WOS:000231233900002 |
URI: |
https://openaccess.sgul.ac.uk/id/eprint/107100 |
Publisher's version: |
https://doi.org/10.1163/1568540054473530 |
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Dwarfs or giants? Sexual size dimorphism in Chondracanthidae (Copepoda, Poecilostomatoida). (deposited 04 Aug 2014 14:36)
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