@article {1707, title = {Predation on snails by three species of triclad and its bearing on the distribution of Planaria torva in Britain}, journal = {Journal of Zoology}, volume = {189}, year = {1979}, month = {1979}, pages = {459 - 484}, publisher = {Blackwell Publishing Ltd}, abstract = {

Dugesia polychroa, D. lugubris and Planaria torva preyed upon snails of differing morphologies and while the Dugesia spp. fed approximately in proportion to snail abundance, PL torva was more selective on Potamopyrgus jenkinsi. The incidence of feeding on four snail taxa by the Dugesia spp. was significantly correlated and differed strikingly from that of PI. torva where feeding was related to its annual life cycle. Large peaks of feeding coincided in the Dugesia spp. for the four snail types; this was attributed to snail vulnerability being increased by environmental disturbance. Comparison of feeding by Dugesia spp. in the presence and absence of PI. torva indicated that severe competition was occurring for food with PI. torva having a food refuge in P. jenkinsi. The distribution of PI. torva in Britain is largely confined to productive habitats in the Glasgow-Edinburgh and East Anglia regions. It is concluded that historical rather than ecological events have played the major part in its distribution to date. The strong association of PL torva with port areas and the canal system suggests that it is a recent introduction via the timber trade with Fennoscania.

}, isbn = {1469-7998}, url = {http://dx.doi.org/10.1111/j.1469-7998.1979.tb03974.x}, author = {Reynoldson, T. B. and Piearce, Bronwen} } @article {724, title = {Contributions to the Biology of freshwater planarians (Turbellaria) from the Victorian Alps, Australia}, journal = {Hydrobiologia}, volume = {62}, number = {2}, year = {1979}, month = {01/1979}, publisher = {Kluwer Academic Publishers}, abstract = {

The ten species of freshwater planarians known from Victoria, including one new species, are briefly reviewed. Detailed field and laboratory studies of six of these have been made and a close correlation between seasonal variation in numbers and viability at different laboratory temperatures is demonstrated. Thus Spathula camara and Reynoldsonia reynoldsoni inhabit temporary habitats that experience wide temperature fluctuations and these two species survive equally well in the laboratory at a wide range of temperatures. In contrast Spathula tryssa appears stenothermal in habitat and in the laboratory cannot tolerate even a small temperature increase. Cura pinguis and Dugesia (Girardia) sp. also show wide temperature tolerance both in terms of abundance in the field and viability studies in the laboratory. Spathula agelaea sp. nov. is unusual in that it shows two annual peaks in abundance and also exhibits aggregatory and cannibalistic behaviour that may be involved in population regulation. Aspects of the distribution, abundance, and life cycle, of all the species are discussed in relation to what is known generally of planarian ecology.

}, doi = {10.1007/BF00037507}, url = {http://link.springer.com/article/10.1007\%2FBF00037507}, author = {David A. Hay and Ian R. Ball} } @article {456, title = {Freshwater triclads (Turbellaria) of North America. XI. Phagocata holleri, new species, from a cave in North Carolina}, journal = {Proceedings of The Biological Society of Washington}, volume = {92}, year = {1979}, pages = {389-393}, chapter = {389}, url = {http://www.biodiversitylibrary.org/page/35514100/$\#$page/413/mode/1up}, author = {Roman Kenk} } @article {799, title = {The karyotypes of two Dugesia species from Corfu, Greece (Platyhelminthes, Turbellaria)}, journal = {Bijdragen tot de Dierkunde}, volume = {48}, number = {2}, year = {1979}, pages = {187-190}, author = {Ian R. Ball} } @article {697, title = {Une nouvelle esp{\`e}ce ib{\'e}rique du {\textquoteright}groupe Dugesia gonocephala{\textquoteright} (Turbellari{\'e}s, Triclades)}, journal = {Bulletin du Musee d{\textquoteright}Histoire Naturelle de Paris (Zoologie)}, volume = {2}, year = {1979}, pages = {329-337}, author = {Nicole Gourbault and Mario Benazzi} }