Abstract
The morphological variation of Keratella cochlearis in a Thames backwater has been studied over 4 years. There was a general inverse relationship between lorica length and temperature, but the annual cycle of change depended upon the rate of change of the temperature, and there was considerable variation between years. There was a similar inverse relationship between posterior spine length and temperature, and a shift in both relationships depending on whether the temperature was increasing or decreasing. As the water temperature increased from winter to summer the lorica and posterior spine were longer than at the same temperature as the water cooled from summer to winter. This shift can be modified by anomalous temperatures, such as a late spring or a cool summer.
The form lacking a posterior spine usually, but not consistently, had a longer lorica than the typical spined forms. It usually disappeared from the samples at the end of November and did not reappear until March, although with a mild autumn and winter it persisted until January before disappearing. Forms without posterior spines did not all have the same origins.
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References
E. H. Ahlstrom (1943) ArticleTitleA revision of the rotatorian genus Keratella with descriptions of three new species and five new varieties Bulletin of the American Museum of Natural History 80 411–457
I. Bielanska-Grajner (1995) ArticleTitleInfluence of temperature on morphological variation in populations of Keratella cochlearis (Gosse) in Rybnik Reservoir Hydrobiologia 313/314 139–146 Occurrence Handle10.1007/BF00025943
B. Carlin (1943) ArticleTitleDie Planktonrotatorien des Motalaström Meddelanden från Lunds Universitets Limnologiska Institution 5 1–255
J. M. Conde-Porcuna R. Morales-Baquero L. Cruz-Pizarro (1993) ArticleTitleEffectiveness of the caudal spine as a defense mechanism in Keratella cochlearis Hydrobiologia 255/256 283–287 Occurrence Handle10.1007/BF00025850
A. M. Derry P. D. N. Hebert E. E. Prepas (2003) ArticleTitleEvolution of rotifers in saline and subsaline lakes: a molecular phylogenetic approach Limnology and Oceanography 48 675–685
P. Eloranta (1982) ArticleTitleNotes on the morphological variation of the rotifer species Keratella cochlearis (Gosse) s.l. in one eutrophic pond Journal of Plankton Research 4 299–312
J. Green (1998) ArticleTitlePlankton associated with medusae of the freshwater jellyfish Craspedacusta sowerbyi (Lankester) in a Thames backwater Freshwater Forum 11 69–76
J Green (1999) ArticleTitleStrategic variation of egg size in Keratella cochlearis Hydrobiologia 387/388 301–310
J. Hauer (1952) ArticleTitlePelagische Rotatorien aus dem Windgfällweiher, Schluchsee und Titisee im südlichen Schwarzwald Archiv für Hydrobiologie, Supplement 20 212–237
A. Hillbricht-Ilkowska (1972) ArticleTitleMorphological variation of Keratella cochlearis (Gosse) (Rotatoria) in several Masurian Lakes of different trophic level Polskie Archiwum Hydrobiologii 19 253–264
A. Hillbricht-Ilkowska (1983) ArticleTitleMorphological variation of Keratella cochlearis (Gosse) in Lake Biwa, Japan Hydrobiologia 104 297–305 Occurrence Handle10.1007/BF00045981
W. Hofmann (1980) ArticleTitleOn morphological variation in Keratella cochlearis populations from Holstein lakes (Northern Germany) Hydrobiologia 73 255–258 Occurrence Handle10.1007/BF00019456
W. Hofmann (1983) ArticleTitleOn temporal variation in the rotifer Keratella cochlearis (Gosse): the question of “Lauterborn- cycles’’ Hydrobiologia 101 247–254
Koste W., 1978. Rotatoria. Die Rädertiere Mitteleuropas. Ein Bestimmungswerk begründet von Max Voigt. Überordnung Monogononta. Gebrüder Borntraeger, Berlin, Stuttgart, I. Textband 673 pp., II. Tafelband, 234 Tafeln
R. Lauterborn (1900) ArticleTitleDer Formenkreis von Anuraea cochlearis. Ein Beitrag zur Variabilität bei Rotatorien I. Morphologische Gliederung des Formenkreises Verhandlungen des Naturhistorisch-Medizinischen Vereins zu Heidelberg 6 412–448
R. Lauterborn (1903) ArticleTitleDer Formenkreis von Anuraea cochlearis. Ein Beitrag zur Variabilität bei Rotatorien. II. Die cyclische oder temporale Variation von Anuraea cochlearis Verhandlungen des Naturhistorisch-Medizinischen Vereins zu Heidelberg 7 529–621
B. Pejler (1957) ArticleTitleOn variation and evolution in planktonic Rotatoria Zoologiska Bidrag från Uppsala 32 1–66
B. Pejler (1962) ArticleTitleOn the variation of the rotifer Keratella cochlearis (Gosse) Zoologiska Bidrag från Uppsala 35 1–17
B. Pejler (1980) ArticleTitleVariation in the genus Keratella Hydrobiologia 73 207–213 Occurrence Handle10.1007/BF00019449
A. Ruttner-Kolisko (1974) ArticleTitlePlankton Rotifers, Biology and Taxonomy Binnengewässer 26 IssueID(Suppl 1) 1–146
R. S. Stemberger J.J. Gilbert (1984) ArticleTitleSpine development in the rotifer Keratella cochlearis: induction by cyclopoid copepods and Asplanchna Freshwater Biology 14 639–647
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Green, J. Morphological Variation of Keratella cochlearis (Gosse) in a Backwater of the River Thames. Hydrobiologia 546, 189–196 (2005). https://doi.org/10.1007/s10750-005-4121-6
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DOI: https://doi.org/10.1007/s10750-005-4121-6