World Congress of Malacology Antwerp ... - Unitas Malacologica

Moreover, the ranges of Ugandan land snail species are significantly nested. The nestedness of the
land snail fauna might have been caused by range restrictions during the Pleistocene cold ages. The
geographic centre of the sets of nested subsets is in the mountains in SW Uganda close to the
supposed East-Congolian forest refuge. Differential immigration of species restricted to the refuge
during the glacials was probably an important mechanism resulting in the observed nestedness of the
ranges of the Ugandan land snail species.
Effect of a novel molluscicide on the snail Oncomelania hupensis
Xu, Xingjian 1 ; Yuan, Yi 1 ; Wei, Fenghua 1 ; Tu, Zuwu 1 ; Cao, Mumin 1 ; He, Hui 1 ; Fan, Hongping 1 ;
Li, Guiling 2 ; Zhao, Yunbing 2 ; Liu, Min 2 ; Dussart,G. 3
1. Hubei Institute of Schistosomiasis Control, Wuhan 430079 China,
Email: xjxu@public.wh.hb.cn
2. Huazhong University of Science and Technique, Tongji Medical College, China,
3. Ecology Research Group, Canterbury Christ Church University, Imperial College at Wye,
Wye, Ashford, Kent TN25 5AH, UK,
Email: gbd1@cant.ac.uk
In recent years, a cooperative project between the Hubei Institute of Schistosomiasis Control and the
Tongji Medical College has developed a novel molluscicide (LDS). In order to further understand the
effect of this molluscicide, parallel trials were undertaken with both LDS and Niclosamide against
Oncomelania hupensis. Application methods included immersion, spraying and powder applications.
For immersed snails, mortality was affected by temperature (LDS 0.4mg/l mortality at 20 o C, 25 o C
and 30 o C was 96.7%, 100% and 100% respectively). In field trials, immersion in 0.4mg/l for 24, 48h
and 72h at temperatures between 15 to 24 o C led to mortality rates of 92%, 100% and 100% for LDS
and 60%, 76%, and 96% for Niclosamide.
When a spray method of application was investigated in the laboratory, 0.4g/m 2 at 25 o C gave a
seven-day mortality rate of 100% for LDS and 96% for Niclosamide. Spraying in the field at
temperatures of 15-24 o C and concentration of 0.2g/m 2 , 0.4g/m 2 and 0.8g/m 2 gave a three-day
mortality rate of 81.4%, 97.0% and 100% respectively for LDS, and 54%, 87% and 91% respectively
for Niclosamide.
Powder application in the lab of 0.4g/ m 2 at 25 o C gave seven-day mortality rates of 92% for LDS and
94% for Niclosamide. In the field, powder application at temperatures of 15-24 o C and concentrations
of 0.2g/ m 2 , 0.4g/ m 2 and 0.8g/ m 2 gave three-day mortality rates of 70%, 90% and 99% respectively
for LDS and 58%, 85% and 90% respectively for Niclosamide. LDS seems to be an interesting
contender as a control agent for O.hupensis. The effects on other target snails which are vectors of
fascioliasis and African schisotomiasis are under investigation.
Malacofauna of Akdağ (Keçiborlu, Isparta, Turkey) and its environs
Yıldırım, M. Zeki 1 ; Kebapçı, Ümit 2
1. M. Akif Ersoy University, Faculty of Education, Burdur, Turkey,
Email: mzekiyildirim@gmail.com
2. Suleyman Demirel University, Faculty of Science and Literature, Isparta, Turkey,
Email: kebapci@fef.sdu.edu.tr
According to surveys carried on between 1993-2006 of the malacofauna in 13 stations representing
Akdağ (1889 m) and its environs (province Isparta), apart from 15 aquatic snails, it has been
determined that 40 land snail species (ordo Stylommatophora) are found in the area. Among these
species 15 are endemic to Turkey (appr. 38%) and 5 are exclusively endemic to the study area. The 5
narrow endemics, the enid Borlumastus yildirimi (monotypic genus) and all clausiliid taxa to exist in
the area (endemic genera Phrygica and Sprattia), reflect the biogeographical isolation from the
surrounding heights
246