Distribution of scaled chrysophytes in 17 Adirondack (New York) lakes with special reference to pH

摘要

Thirty-four scaled chrysophyte taxa are described from 17 Adirondack lakes located in either Hamilton or Franklin counties. Ten taxa,Synura sphagnicola,Syn.echinulata,Syn.petersenii,Mallomonas acaroidesvar.muskokana,M.hamata,M.caudata,M.crassisquama,M.galeiformis,Spiniferomonas trioralis, andChrysosphaerella longispina, were found in more than 40 of the study lakes.Mallomonas acaroidesvar.muskokana,M.hamata,Syn.sphagnicola,Syn.echinulata, andSpiniferomonas coronacircumspinawere common and important components of the phytoplankton floras in lakes with a pHensp;ensp;5.4; however,M.hamataandSp.coronacircumspinawere noticeably absent from bog lakes.Synura sphagnicolaandSyn.echinulatawere as common in samples with a pH between 5.4 and 7 as they were below pH 5.4.Mallomonas crassisquama,M.caudata,M.pseudocoronata, andSynura spinosawere found in a significantly greater percentage of samples from circumneutral lakes and were lacking from waters with a pHensp;ensp;5.4. Differences in species distributions between Hamilton County (higher mean pH) and Franklin County lakes further supported the observed pH ranges of the common taxa. Similarities and differences are made with a study of Smol et al. (Can. J. Bot. 62: 911ndash;923), who described the distribution of scaled chrysophytes from the surface sediments of Adirondack lakes.