A quarter century of recovery of the whelk Thais orbita from tributyltin pollution off Perth, Western Australia
Embargo Lift Date
MetadataShow full item record
Imposex is a condition in which females of dioecious marine snails develop rudimentary male characteristics. It is caused by tributyltin (TBT) used as an antifoulant in vessel paints since the late 1960s. Following the 2008 international ban on TBT, a decreasing rate of imposex has been observed worldwide. In Western Australia, imposex surveys of the whelk Thais orbita up to 2011 in the Perth metropolitan area suggested a decreasing trend but a significant recovery has not been confirmed. Collection of T. orbita from 11 sites in 2019 demonstrated a virtually complete recovery from imposex. Although it is generally accepted that male snails are not affected by TBT, the historical data set allowed confirmation that the male penis is of similar size in T. orbita collected at heavily affected sites and at relatively unaffected sites. Similarly, imposexed female snails had similar shell lengths to female snails at non-impacted sites.
Showing items related by title, author, creator and subject.
Carbonate eolianites, quartz sands, and Quaternary sea-level cycles, Western Australia: A chronostratigraphic approachHearty, P.; O'Leary, Mick (2008)Marine and eolian carbonate deposits, grouped under the name “Tamala Limestone”, have been investigated along thousands of kilometers of coastal Western Australia (WA). Relative-age diagenetic features of carbonate sand ...
Inland shell midden site-formation: Investigation into a late Pleistocene to early Holocene midden from Trang An, Northern VietnamRabett, R.; Appleby, J.; Blyth, Alison; Farr, L.; Gallou, A.; Griffiths, T.; Hawkes, J.; Marcus, D.; Marlow, L.; Morley, M.; Tan, N.; Son, N.; Penkman, K.; Reynolds, T.; Stimpson, C.; Szabo, K. (2011)Over the course of the past two decades there has been growing research interest in the site formation processes of shell middens. This stands along-side and is being used to inform cultural, dietary and palaeo-environmental ...
Coll, Sandhya Devi (2015)This thesis reports on an inquiry on enhancing students’ learning experiences outside school (LEOS) using digital technologies. The inquiry took the nature of an ethnographic case study which was conducted over a year. ...