Cylindrospermopsis raciborskii (Wolosz.) Seenaya and Subba Raju (Cyanophyceae) dominance and a contribution to the knowledge of Rio Pequeno Arm, Billings Reservoir, Brazil

Phytoplankton dynamics in two tropical rivers with different degrees of human impact (southeast Brazil)

“…Although it may be dominant in oligotrophic environments (Hamberg, 1987), as well as in subtropical (Komárková Legnerová et al, 1999) and temperate (Padisák, 1997) regions, C. raciborskii is generally associated with eutrophic and tropical environments. Moreover, blooms of C. raciborskii populations have been documented in Brazil, especially in reservoirs from the Northeast (Bouvy et al, 2003;Molica et al, 2005) to subtropical areas in the South (Andrade et al, 1988;Komárková Legnerová et al, 1999), including reservoirs in the Middle West (Branco and Senna, 1994) and Southeast (Giani, 1994;Souza et al, 1998;Jardim et al, 2001;Marinho and Huszar, 2002). The percentage of C. raciborskii filaments with heterocytes was low (2%) in the two periods, as recorded for other Brazilian systems (Branco and Senna, 1994;Huszar et al, 2000), indicating the high affinity of this species for dissolved inorganic nitrogen (Présing et al, 1996).…”

“…C. raciborskii was found and described as Anabaena raciborskii in 1912 in Indonesia and in the last decades has occupied a large and rapidly expanding geographical area, occuring in lakes, reservoirs and rivers (Padisák, 1997). In Brazil, C. raciborskii was recorded in the 1990's (Branco and Senna, 1994;Souza et al, 1998), and has increased its occurrence since then. According to Isvánovics et al (2000), the invasive success of this species challenges eutrophication control in many lakes and can be explained by adaptive characteristics such as buoyancy, low light tolerance, ability to use internal P-sources, high affinity P and ammonia uptake (Padisák, 1997).…”

PULSES OF PHOSPHATE PROMOTE DOMINANCE OF THE TOXIC CYANOPHYTE CYLINDROSPERMOPSIS RACIBORSKII IN A SUBTROPICAL WATER RESERVOIR1

“…It poses a health risk to drinking water reservoirs and recreational lakes due to its ability to produce toxins, including cylindrospermopsin and paralytic shellfish poison. Toxic strains occur in many parts of the world including Australia and Brazil (Fabbro and Duivenvoorden 1996, de Souza et al. 1998).…”

“…2006). Conditions thought to promote growth of C. raciborskii are diverse and include high temperatures, vertical water stratification, long water residence times, and high concentrations of DIP, ammonium, nitrate, and iron (Dokulil and Mayer 1996, de Souza et al. 1998, Bouvy et al.…”

Ecologia da comunidade fitoplactônica em dois braços da Represa Billings (São Paulo, SP) com diferentes graus de trofia

“…Assim como observado em estudos realizados em reservatórios eutróficos - Bouvy et al (1999) no Reservatório de Ingazeira (PE), Souza et al (1998) Espécies pertencentes aos grupos H 1 , S 1 ou S n estão freqüentemente em competição (NIXDORF et al, 2003;PADISÁK et al, 2003)…”