Morphological comparison of the second gnathopod in males of four caprellid species (Amphipoda: Caprellidae)
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The second gnathopods of caprellid male amphipods are larger than the ones observed in females. The second gnathopods are armed with a propodus or tooth that is associated with a poison producing gland, by which male-male contests lead to fatal outcomes. Here we observed the ultrastructure of the second gnathopods by scanning electron microscopy and compared the relationship between the number of pores in the poison tooth and body length among the males of four caprellid species: Caprella acanthogaster, C. bispinosa, C. scaura, and C. penantis. All species possess pores on the poison tooth, and the number of pores increased with body size. The number of pores also differed among specimens of the four species. Furthermore, in males of three caprellid species, except for C. penantis, we found additional pores at the tip of the dactylus of second gnathopods. The number of pores on the tip of the dactylus did not increase with body length, and the average number of them differed among the three species. Although it is not known if venom is released from the pores of both structures, larger individuals that possess more pores on the second gnathopods could have a competitive advantage in male-male competition.
Affiliations:
1: Laboratory of Marine Biology, Graduate School of Fisheries Science, Hokkaido University, Hakodate 041-8611, Japan
1. AokiM.1999. "Morphological characteristics of young, maternal care behaviour and microhabitat use by caprellid amphipods". Journal of the Marine Biological Association in the United Kingdom Vol 79: 629- 638. http://dx.doi.org/10.1017/S0025315498000794
2. ArimotoI.1976. Taxonomic studies of caprellids (Crustacea, Amphipoda, Caprellidae) found in the Japanese and adjacent waters. Special Publications from the Seto Marine Biological Laboratory, Series III, December, 229 pp.
3. BynumK. H.1980. "Multivariate assessment of morphological variation in Caprella penantisLeach, 1814 (Amphipoda: Caprellidae)". Estuarine and Coastal Marine Science Vol 10: 225- 235. http://dx.doi.org/10.1016/S0302-3524(80)80060-0
4. CabezasM. P. , Guerra-GarcíaJ. M. , Baeza-RojanoE. , Redondo-GómezS. , FigueroaM. E. , LuqueT. , García-GómezJ. C. . 2010. "Exploring molecular variation in the cosmopolitan Caprella penantis(Crustacea: Amphipoda): results from RAPD analysis". Journal of the Marine Biological Association of the United Kingdom Vol 90: 617- 622. http://dx.doi.org/10.1017/S0025315409990828
5. CaineE. A.1974. "Comparative functional morphology of feeding in three species of caprellids (Crustacea, Amphipoda) from the northwestern Florida gulf coast". Journal of Experimental Marine Biology and Ecology Vol 15: 81- 96. http://dx.doi.org/10.1016/0022-0981(74)90065-3
6. CaineE. A. . 1979. "Population structures of two species of caprellid amphipods (Crustacea)". Journal of Experimental Marine Biology and Ecology Vol 40: 103- 114. http://dx.doi.org/10.1016/0022-0981(79)90038-8
7. ConlanK. E.1991. "Precopulatory mating behavior and sexual dimorphism in the amphipod Crustacea". Hydrobiologia Vol 223: 255- 282. http://dx.doi.org/10.1007/BF00047644
8. Guerra-GarcíaJ. M. , Redondo-GómezS. , EspinaÁ. G. , CastilloJ. M. , LuqueT. , García-GómezJ. C. , FigueroaM. E. . 2006. " Caprella penantisLeach, 1814 and Caprella dilatataKroyer, 1843 (Crustacea: Amphipoda) from the Strait of Gibraltar: a molecular approach to explore intra- and interspecific variation". Marine Biology Research Vol 2: 100- 108. http://dx.doi.org/10.1080/17451000600672511
9. LaubitzD. R. , LewbelG. S. . 1974. "A new species of caprellid (Crustacea: Amphipoda) associated with gorgonian octocorals". Canadian Journal of Zoology Vol 52: 549- 551. http://dx.doi.org/10.1139/z74-070
10. LeachW. E.1814. "Crustaceology", pp. 383- 437. In, BrewsterD. (ed.), The Edinburgh Encyclopaedia Vol 7. Blackwood, Edinburgh.
11. LewbelG. S.1978. "Sexual dimorphism and intraspecific aggression, and their relationship to sex ratios in Caprella gorgoniaLaubitz & Lewbel (Crustacea: Amphipoda: Caprellidae)". Journal of Experimental Marine Biology and Ecology Vol 33: 133- 151. http://dx.doi.org/10.1016/0022-0981(78)90004-7
12. LimS. T. A. , AlexanderC. G. . 1986. "Reproductive behaviour of the caprellid amphipod, Caprella scaura typica, Mayer 1890". Marine Behaviour and Physiology Vol 12: 217- 230. http://dx.doi.org/10.1080/10236248609378648
13. MayerP.1890. "Die Caprelliden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte". Fauna und Flora des Golfes von Neapel Vol 17: 1- 55.
14. R Development Core Team. 2011. R: A Language and Environment for Statistical Computing. R Foundation for Statistical Computing, Vienna, Austria.
15. SchulzM. K. , AlexanderC. G. . 2001. "Aggressive behavior of Caprella scaura typicaMayer, 1980. (Crustacea: Amphipoda)". Marine and Freshwater Behaviour and Physiology Vol 34: 181- 187. http://dx.doi.org/10.1080/10236240109379071
16. TakeshitaF. , HenmiY. . 2010. "The effects of body size, ownership and sex ratio on the precopulatory mate guarding of Caprella penantis(Crustacea: Amphipoda)". Journal of Marine Biological Association of United Kingdom Vol 90: 275- 279. http://dx.doi.org/10.1017/S0025315409990671