| [ecological observations on biomphalaria straminea (dunker, 1848) in areas of the northeast, brazil]. | the different climatic regions determine the zoogeographic distribution of various animal species depending on their particular conditions and ecological preferences. the host schistosomiasis planorbid is one of these species. this paper deals with the distribution of biomphalaria straminea in northeast brazil. it starts from the analysis of different climatic peculiarities in this region, associated to limnological observation done by the author in three different hydric collections in the stat ... | 1987 | 3509188 |