GLOSSARY OF LIMNOLOGICAL TERMS

Athalassohaline: Having a salt composition very different from that of seawater Chemocline: Water layer with steep gradients of concentrations of chemicals (nutrients, oxygen, salts, etc.) Epilimnion: The upper, mixed layer of a stratified lake Holomixis: Period of complete mixing of a lake with water circulation from top to bottom Hypolimnion: The lower water layer of a stratified lake Meromixis: Permanent stratification, in which the water layers of a lake do not mix at any time during the annual cycle Metalimnion: Intermediate layer between the epilimnion and the hypolimnion; often corresponding to the chemocline and/or pycnocline Mixolimnion: The upper mixed layer of a meromictic lake Monomixis: Regime in which a seasonally stratified lake turns over once each year Monimolimnion: The stagnant bottom layer of a meromictic lake Oxycline: Water layer with a steep oxygen concentration gradient Pycnocline: Water layer with a steep density () gradient Thalassohaline: Having a salt composition similar to that of seawater Thermocline: Water layer with a steep temperature gradient

559 ABOUT THE AUTHOR

Aharon Oren was born in 1952 in Zwolle, the Netherlands. He obtained his M.Sc. degree in microbiology and biochemistry (1974) from the State University of Groningen, the Netherlands, and his Ph.D. degree in microbiology (1978) from the Hebrew University of Jerusalem, Israel. He is was appointed as senior lecturer (1985), associate professor (1991), and professor of microbial ecology (1996) at the Hebrew University, and serves as department chairman since 1998. He has been a post-doctoral research fellow (1982-1983) and visiting assistant professor (1983- 1984) at the University of Illinois at Urbana- Champaign, and was appointed affiliate professor of George Mason University, Fairfax, Virginia. He is a member of the International Committee of the International Society for Environ- mental Biogeochemistry and of the Executive Committee of the International Society for Research. In the field of pro- karyote taxonomy, he is secretary of the International Committee on Systematics of Prokaryotes Sub- committee on Taxonomy of Halo- bacteriaceae, member of the Inter- national Committee on System- atics of Prokaryotes Subcommittee on the Taxonomy of Photosyn- thetic Prokaryotes, co-opted member of the International Committee on Systematics of Pro- karyotes, and associate member of Bergey's Manual Trust. He has been a member of the editorial board of the International Journal of Salt Lake Research, and he serves as editor of FEMS Microbiology Letters, associate editor of the International Journal of Systematic and Evolutionary Microbiology, and member of the editorial board of Extremophiles. Prof. Oren was the recipient of the Moshe Shilo prize of the Israel Society for Microbiology for 1993, and was elected Fellow of the American Academy of Microbiology in 2000.

561 ORGANISM INDEX

A C

Acetohalobium, 51, 151, 156, Calothrix, 286 530 Chaetoceros, 508, 509 Actinopolyspora, 55, 100, 291 Chilophyra, 401 Agmenellum, 219 Chlamydomonas, 402 Aequoria, 339 Chromatium, 445, 473, 522 Alcalilimnicola, 42, 483 Chromohalobacter, 45, 103, Alternaria, 111, 451 146, 148, 209, 216, 221, Alteromonas, 370, 518 222, 254, 280, 290, 293, Amoeba, 401 343, 346, 348, 370, 375, Amoebobacter, 407 432, 450 Amphora, 57, 445, 500 Chroococcidiopsis, 37, 523 Anabaena, 512 Coccochloris, 445 Anacystis, 445 Chroococcus, 445 Ankistrodesmus, 508, 509 Coccomyxa, 540 Anomoeoneis, 500 Cocconeis, 445 Aphanocapsa, 375, 445, 490, Corynebacterium, 519 523 Cladosporium, 111, 406, 451 Aphanothece, 37, 178, 218, Clostridium, 11, 48, 109, 423, 287, 287, 374, 402, 407, 485, 501, 532 409, 442, 444, 445, 446, Ctenocladus, 508, 509 459, 490, 523, 524 Cyanospira, 484 Arhodomonas, 42 Cyanothece, 37, 38, 178, 374. Artemia, 6, 403, 406, 409, 411, 445, 459, 490 442, 461, 502, 503 Arthrobacter, 518 D Aspergillus, 451 Asteromonas,