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Search for temperature ecotypes in Champia parvula (Rhodophyta) and Cladophoropsis membranacea (Chlorophyta)

Besten, A.Y. den (1999) Search for temperature ecotypes in Champia parvula (Rhodophyta) and Cladophoropsis membranacea (Chlorophyta). Master's Thesis / Essay, Biology.

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Six isolates of Champia parvula (C. Agardh) Harvey were cultured at different daylength and temperature combinations in order to find reproductive ecotypes. No reproduction has been found so other experiments need to be conducted. Growth curves of 7 different Cladophoropsis membranacea (C. Agardh) Boergesen isolates and isolates of 3 related species (Cladophoropsis sundanensis Reinbold, Chamaedoris peniculum (Solander) Lamouroux and Struvea anastomosans (Harvey) Piccone & Grunow were constructed in order to examine ecotypic variation in C. membranacea. No major differences in growth curves between the different isolates and species were found. When the potential growth yields per month were calculated, a decrease in the potential monthly growth rates going from the tropics towards more temperate zones was seen. A significant correlation between the February isotherm and potential growth rate, and between the August isotherm and potential growth rate at this temperature was found. Growth curves were superimposed on the phylogenetic tree (Kooistra et a! 1992, 1993) to compare them with the temperature survival ecotypes found by Pakker et a! (1995) to see if the phylogentic imprint is found at the same places. No grouping similar to that of the survival ecotypes or any other kind of grouping was found. As no clear ecotypes for growth of C. membranacea were found, and no adaptation to more temperate climate zones was observed, it can be conclude that a strong tropical growth imprint persists through the whole phylogenetic tree.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Biology
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 07:44
Last Modified: 15 Feb 2018 07:44

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