Island Syndrome in the Critically Endangered Lord Howe Island Cockroach Panesthia lata

Research on the critically endangered Lord Howe Island cockroach, Panesthia lata, reveals novel evidence of behavioural island syndrome in an invertebrate. The study found a significantly lower incidence of male agonism and large aggregations of unrelated individuals in P. lata compared to its Australian sister species, P. cribrata. This aligns with previous findings of relaxed intraspecific aggression in island mammals and reptiles. Additionally, courtship behaviour did not vary between populations, suggesting potential for interbreeding—a promising outcome for the conservation of this fragmented species. The study used behavioural assays and nuclear single-nucleotide polymorphism analyses to compare P. lata with P. cribrata, providing insights into adaptive radiation and ecological release in island environments.

Coady, S. K., Adams, M. W. D., Rose, H. A., Walker, J. A., Hutton, I., Gloag, R., & Lo, N. (2025). Island Syndrome in the Critically Endangered Lord Howe Island Cockroach Panesthia lata. Ecology and Evolution, 15(11). Portico. https://doi.org/10.1002/ece3.72402