01758nas a2200157 4500008004100000020001400041245012400055210006900179260003500248300001400283490000800297520119400305100002301499700002101522856005701543 1979 eng d a1469-799800aPredation on snails by three species of triclad and its bearing on the distribution of Planaria torva in Britain0 aPredation on snails by three species of triclad and its bearing  bBlackwell Publishing Ltdc1979 a459 - 4840 v1893 a

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.

1 aReynoldson, T., B.1 aPiearce, Bronwen uhttp://dx.doi.org/10.1111/j.1469-7998.1979.tb03974.x01663nas a2200133 4500008004100000245010700041210006900148260004000217490000700257520117000264100001901434700001801453856005801471 1979 eng d00aContributions to the Biology of freshwater planarians (Turbellaria) from the Victorian Alps, Australia0 aContributions to the Biology of freshwater planarians Turbellari bKluwer Academic Publishersc01/19790 v623 a

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.

1 aHay, David, A.1 aBall, Ian, R. uhttp://link.springer.com/article/10.1007%2FBF0003750700456nas a2200109 4500008004100000245012900041210006900170300001200239490000700251100001600258856007200274 1979 eng d00aFreshwater triclads (Turbellaria) of North America. XI. Phagocata holleri, new species, from a cave in North Carolina0 aFreshwater triclads Turbellaria of North America XI iPhagocata h a389-3930 v921 aKenk, Roman uhttp://www.biodiversitylibrary.org/page/35514100/#page/413/mode/1up00401nas a2200109 4500008004100000245009200041210006900133300001200202490000700214100001800221856005200239 1979 eng d00aThe karyotypes of two Dugesia species from Corfu, Greece (Platyhelminthes, Turbellaria)0 akaryotypes of two Dugesia species from Corfu Greece Platyhelmint a187-1900 v481 aBall, Ian, R. uhttps://continenticola.myspecies.info/node/136000443nas a2200121 4500008004100000245009800041210007100139300001200210490000600222100002200228700001900250856005200269 1979 eng d00aUne nouvelle espèce ibérique du ’groupe Dugesia gonocephala’ (Turbellariés, Triclades)0 aUne nouvelle espèce ibérique du groupe Dugesia gonocephala Turbe a329-3370 v21 aGourbault, Nicole1 aBenazzi, Mario uhttps://continenticola.myspecies.info/node/1361