TY - JOUR
T1 - Grazer-induced colony formation in Scenedesmus acutus (Chlorophyceae): Ecomorph expression at different temperatures
AU - Lürling, M.
AU - Van Donk, E.
N1 - Reporting year: 1999
Metis note: 2616; CL; AFW ; AqE; file:///L:/Endnotedatabases/NIOOPUB/pdfs/Pdfs1999/Lurling_ea_2616.pdf
PY - 1999
Y1 - 1999
N2 - Scenedesmus acutus Meyen was cultured at four temperatures (9.5 degrees, 16.5 degrees, 24 degrees, and 29 degrees C) in standard medium or in medium with filtered water from a Daphnia culture, Growth was significantly reduced at low temperatures. At 9.5 degrees C it took more than a week before formation of eight-celled coenobia occurred in both the absence and presence of water from a Daphnia culture, At higher temperatures, formation of four- and eight-celled coenobia occurred more rapidly and was already observed in the presence of Daphnia water within 2 days, As cultures aged, also in the absence of Daphnia water, four-celled coenobia became dominant. At cold temperature, cell volume initially was significantly larger but declined after 3-4 weeks. Grazer-induced colony formation had occurred independent of the incubation temperature, but the number of cells per colony was increased with declining temperature. The morphological expression may be interpreted as a cyclomorphosis driven by nutrients, temperature, and chemical cues from gazers. [KEYWORDS: colony formation; cyclomorphosis; Daphnia; ecomorph; growth; infochemicals; phenotypic plasticity; Scenedesmus acutus; temperature Phenotypic plasticity; morphological-changes; daphnia-pulex; phytoplankton; growth; cyclomorphosis; light; transformation; infochemicals; consequences]
AB - Scenedesmus acutus Meyen was cultured at four temperatures (9.5 degrees, 16.5 degrees, 24 degrees, and 29 degrees C) in standard medium or in medium with filtered water from a Daphnia culture, Growth was significantly reduced at low temperatures. At 9.5 degrees C it took more than a week before formation of eight-celled coenobia occurred in both the absence and presence of water from a Daphnia culture, At higher temperatures, formation of four- and eight-celled coenobia occurred more rapidly and was already observed in the presence of Daphnia water within 2 days, As cultures aged, also in the absence of Daphnia water, four-celled coenobia became dominant. At cold temperature, cell volume initially was significantly larger but declined after 3-4 weeks. Grazer-induced colony formation had occurred independent of the incubation temperature, but the number of cells per colony was increased with declining temperature. The morphological expression may be interpreted as a cyclomorphosis driven by nutrients, temperature, and chemical cues from gazers. [KEYWORDS: colony formation; cyclomorphosis; Daphnia; ecomorph; growth; infochemicals; phenotypic plasticity; Scenedesmus acutus; temperature Phenotypic plasticity; morphological-changes; daphnia-pulex; phytoplankton; growth; cyclomorphosis; light; transformation; infochemicals; consequences]
U2 - 10.1046/j.1529-8817.1999.3561120.x
DO - 10.1046/j.1529-8817.1999.3561120.x
M3 - Article
SN - 0022-3646
VL - 35
SP - 1120
EP - 1126
JO - Journal of Phycology
JF - Journal of Phycology
IS - 6
ER -