Geographic variation in thermal traits in Digenea simplex and Champia parvula (Rhodophyta) in relation to present and glacial temperature regimes
| Autor: | Anneke M. Breeman, Sotiris Orfanidis |
|---|---|
| Přispěvatelé: | Faculty of Science and Engineering |
| Jazyk: | angličtina |
| Rok vydání: | 1999 |
| Předmět: |
Mediterranean climate
Range (biology) Biogeography glaciation selection ECOTYPIC DIFFERENTIATION Plant Science Red algae adaptation Aquatic Science CLADOPHORA CLADOPHORALES DISTRIBUTION BOUNDARIES Algae SEAWEEDS Temperate climate Glacial period MEDITERRANEAN MACROALGAE biogeography trade-off algae biology Ecology Tropics temperature ecoclinal variation biology.organism_classification humanities PHYCODRYS-RUBENS Digenea simplex NORTH-ATLANTIC OCEAN Champia parvula REQUIREMENTS CHLOROPHYTA RESPONSES |
| Zdroj: | Journal of Phycology, 35(5), 919-930. Wiley Journal of Phycology, 919-930. Wiley STARTPAGE=919;ENDPAGE=930;TITLE=Journal of Phycology Scopus-Elsevier |
| ISSN: | 0022-3646 |
| Popis: | Geographic variation in temperature responses (survival and growth) was investigated in two red algae: Digenea simplex (Wulfen) C. Agardh and Champia parvula (C. Agardh) Harvey. D. simplex has a tropical to warm temperate distribution; C. parvula extends from the tropics into the cold temperate zone. Ecoclinal variation was found in both species but was much stronger in C. parvula than in D. simplex. The former species showed variation in upper and lower tolerance limits as well as in the upper and lower limits for growth. The latter species showed variation mainly in its lower tolerance limit. Ecoclinal variation was related to the amount of present and glacial selection pressure along the climate gradient. In both species, isolates from the colder localities had insufficient cold tolerance to have survived low glacial winter temperatures, so these locations must have been colonized after the end of the glaciation. Eastern Mediterranean and Atlantic populations were probably isolated during the glaciation by a thermal barrier at the entrance of the Mediterranean. In C. parvula, evidence existed for a trade-off between the performance at high and at low temperatures, which would enhance selection pressure in opposite directions at either end of the climatic range. No evidence for such a trade-off was found in D. simplex. |
| Databáze: | OpenAIRE |
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