Hanlon Lab – Sexual Selection

Sexual selection theory is being tested using squid and cuttlefish. Field and laboratory studies focus on mechanisms of agonistic behavior, female mate choice, and sperm competition. The latter studies involve DNA fingerprinting to determine paternity and help assess alternative mating tactics.

Publications on sexual selection:

Marian, J.E.A.R., Apostólico, L.H., Chiao, C.C., Hanlon, R.T., Hirohashi, N., Iwata, Y., Mather, J.A., Sato, N., Shaw, P.W. (2019). Male alternative reproductive tactics and associated evolution of anatomical characteristics in Loliginid squid. Frontiers in Physiology, 10(1281). DOI: 10.3389/fphys.2019.01281

Buresch, K. C., Maxwell, M. R., & Hanlon, R.T. In press, 2009. Temporal dynamics of mating and paternity in the squid Loligo pealeii. Marine Ecology Progress Series

Hanlon, R.T., Naud, M.-J,; Shaw, P.W., & Havenhand, J.N. 2005. Transient sexual mimicry leads to fertilisation. Nature 430: 212.

Naud, M.-J., Hanlon, R.T., Hall, K.C., Shaw, P.W., & Havenhand, J.N. 2004. Behavioral and genetic assessment of mating success in a natural spawning aggregation of the giant cuttlefish (Sepia apama) in southern Australia. Animal Behaviour 67: 1043-1050.

Buresch, K.C., Boal, J.G., Knowles, J., DeBose, J., Nichols, A., Erwin, A., Painter, S.D., Nagle, G.T., & Hanlon, R.T. 2003. Contact chemosensory cues in egg bundles elicit male-male agonistic conflicts in the squid Loligo pealeii (Mollusca: Cephalopoda). J. Chem. Ecol. 29(3):547-560.

Hanlon, R.T., Smale, M.J., & Sauer, W.H.H. The mating system of the squid Loligo vulgaris reynaudii (Cephalopoda, Mollusca) off South Africa: Fighting, guarding, sneaking, mating and egg laying behavior. Bull. Mar. Sci. 71 (1) 331-345.

Hall, K.C., & Hanlon, R.T. 2002. Principal features of the mating system of a large spawning aggregation of the giant Australian cuttlefish Sepia apama (Mollusca: Cephalopoda). Mar. Biol. 140(3):533-545.

Buresch, K.M., Hanlon, R.T., Maxwell, M.R., & Ring, S. 2001. Microsatellite DNA markers indicate a high frequency of multiple paternity within individual field-collected egg capsules of the squid Loligo pealeii. Mar. Ecol. Prog. Ser. 210: 161-165.

Maxwell, M.R., Buresch, K.M., & Hanlon, R.T. 2000. Pattern of inheritance of microsatellite loci in the squid Loligo pealeii (Mollusca: Cephalopoda). Mar. Biotechnol. 2: 517-521.

Maxwell, M.R., & Hanlon, R.T. 2000. Female reproductive output in the squid Loligo pealeii: multiple egg clutches and implications for a spawning strategy. Mar. Ecol. Prog. Ser. 199: 159-170.

King, A.J., Adamo, S.A., & Hanlon, R.T. 1999. Contact with squid egg capsules increases agonistic behavior in male squid (Loligo pealei). Biol. Bull. 197: 256.

Hanlon, R.T., Ament, S.A., Gabr, H. 1999. Behavioral aspects of sperm competition in cuttlefish, Sepia officinalis (Sepioidea: Cephalopoda). Mar. Biol. 134: 719-728.

Hanlon, R.T. 1998. Mating systems and sexual selection in the squid Loligo: How might commercial fishing on spawning squids affect them? Calcofi Rep. 39: 92-100.

Maxwell, M.R., Macy, W.K., Odate, S., & Hanlon, R.T. 1998. Evidence for multiple spawning by squids (Loligo pealei) in captivity. Biol. Bull. 195(2): 225-226.