Dec 1, 2017 - In I 998, C. cuspis invaded Lake Kinneret, Israel, 4 years after the invasion and major bloom of Aphanizomenon ovali- sporum, the first-ever ...
SIL Proceedings, 1922-2010
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Invasion of Lake Kinneret by the N2-fixing cyanobacterium Cylindrospermopsis cuspis Komarek & Kling Tamar Zohary & Miki Shlichter To cite this article: Tamar Zohary & Miki Shlichter (2009) Invasion of Lake Kinneret by the N2fixing cyanobacterium Cylindrospermopsis cuspis Komarek & Kling, SIL Proceedings, 1922-2010, 30:8, 1251-1254, DOI: 10.1080/03680770.2009.11923923 To link to this article: https://doi.org/10.1080/03680770.2009.11923923
Published online: 01 Dec 2017.
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Date: 02 December 2017, At: 07:40
Verh. lnternat. Verein. Limnol. 2009, vol. 30, Part 8, p. 1251-1254, Stuttgart, October 2009 © by E. Schweizerbart'sche Verlagsbuchhandlung 2009
lnvasion of Lake Kinneret by the N 2 -fixing cyanobacterium Cylindrospermopsis cuspis Komarek & Kling Tamar Zohary and Miki Shlichter
Downloaded by [221.232.128.22] at 07:40 02 December 2017
Introduction Nitrogen-fixing filamentous Cylindrospermopsis raciborskii is a tropical cyanobacterium that in recent years has invaded temperate inland waters all over the world (PADISAK 1997). Its Iess wide-spread relative, Cylindrospermopsis cuspis KoMAREK & KLING ( 1991 ), first described from Lake Victoria, was then reported to occur in small volcanic lakes in the Los Tuxtlas region, Mexico (KOMAREK & KOMARKOVA-LEGNEROVA 2002), and in Lake Okeechobee, Florida (PHLIPS et al. 1997). Akinetes were not observed by Komarek and Kling and were never described for this species. In I 998, C. cuspis invaded Lake Kinneret, Israel, 4 years after the invasion and major bloom of Aphanizomenon ovalisporum, the first-ever reported bloom ofN 2-fixing cyanobacteria (POLLINGHER et al. 1998) in this mesoeutrophic, subtropical, warm monomictic lake (SERRUYA 1978). Since its 1998 appearance, C. cuspis has been found in the water column nearly every summer, initially at Iow concentrations, but since 2003 it has formed major summer blooms, exceeding by far the abundance of A. ovalisporum (Fig. 1). Until 2000, the rare C. cuspis trichomes had no heterocytes and were recorded as Raphidiopsis mediterranea. The first heterocytebearing filaments were observed in 2001, when filament abundance first exceeded 500/mL, and they were identified by J. Komarek as C. cuspis. We report here on the spatial and temporal dynamics of C. cuspis in Lake Kinneret, examine these dynamics in relation to environmental parameters, and assess features that may have enabled it to out-compete A. ovalisporum.
Key words: akinete, Aphanizomenon ovalisporum, cyanobacterial bloom, Cylindrospermopsis cuspis, Lake Kinneret
additional water samples for phytoplankton analyses were collected from 7 littoral and pelagic stations around the lake. Phytoplankton cell or filament abundance, wet-weight biomass, and depth-integrated biomass were determined as described in ZoHARY (2004). Chemical analyses were conducted according to APHA ( 1992) and chlorophyll analyses according to HoLM-HANSEN et al. ( 1965).
Results and discussion Temporal dynamics and spatial distribution of C. cuspis abundance and biomass In May 1998, a few C. cuspis filaments were first noticed in Lake Kinneret water. Since then, this cyanobacterium has appeared in the lake plankton every summer-fall, but until 2002 its abundance remained below 700 filaments/ mL and 2000 filaments/mL, accounting for 39-85% of phytoplankton biomass, with the most intensive bloom recorded in summer 2005 (Fig. l and 2). The filaments appeared in the water col-
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As part of an on-going monitoring program on Lake Kinneret initiated in I 969, water samples for chemical, chlorophyll, and phytoplankton analyses were collected weekly from 1Oto I 3 discrete depths along the 43-m water colurnn at station A, at the deepest part of Lake Kinneret. During 200 1-2002,
94 95 96 97 98 99 00 01 02 03 04 os 06
Fig. l. Mean epilimnetic biomass of Cylindrospermopsis cuspis and Aphanizomenon ovalisporum in Lake Kinneret, 1994-2006, showing also percent contribution to total phytoplankton biomass at peak abundances. 0368-0770/09/1251 $ 1.00 © by E. Schweizerbart'sche Verlagsbuchhandlung 2009
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Verh. Intemat. Verein. Limnol. 30 population continued to decline more gradually. A lowdensity population of
