Field and Culture Studies of Porphyra spiralis var. amplifolia Oliveira Filho et Coll (Bangiales, Rhodophyta) from Isla de Margarita, Venezuela

Abstract

Porphyra from the Caribbean coast of Venezuela, previously referred to P. umbilicalis (L.) J. Agardh, was found to be conspecific with P. spiralis var. amplifolia Oliveira Filho et Coll which was described from Brazil. Laboratory studies have produced a functional life history from the blade to filamentous conchocelis phase and back to the blade. Cross-gradient light-temperature culture was utilized to investigate the effects of photon fluence rate, temperature and daylength on conchocelis growth and reproduction. Both conchospore formation and release occurred only in a daylength of 12 h or less, with the former restricted to 20 -30 °C, and the latter to 15 -22 °C. Results of these investigations were used to explain the seasonal periodicity of growth and reproduction of this species observed in a field study on Isla de Margarita.

Making the links: towards a global taxonomy for the red algal genus Porphyra (Bangiales, Rhodophyta)

“…Species occur in the intertidal and shallow subtidal throughout the world. Although they are particularly abundant in boreal and cold temperate waters, they are also found in the Arctic and Antarctic and warm temperate and tropical regions (Kapraun and Lemus 1987), with evidence that some species in the tropics occur during the rainy season (Sahoo et al 2006;Fujiyoshi et al 2007). Fossil evidence based on diagnostic cell division suggests that bangiacean red algae occurred at least 1.2 billion years ago, with Bangiomorpha pubescens Butterfield representing the oldest taxonomically resolved eukaryote (Butterfield 2000).…”

PHYCOBILIN CONTENT OF THE CONCHOCELIS PHASE OF ALASKAN PORPHYRA (BANGIALES, RHODOPHYTA) SPECIES: RESPONSES TO ENVIRONMENTAL VARIABLES1

“…Although there have been many studies dealing with the classification, morphology, life history, development, growth, and ecology regarding the gametophyte stage of Porphyra species from different geographic distributions (Conway and Cole 1977, Chang et al. 1983, Herbert 1984, Gao and Aruga 1987, Kapraun and Lemus 1987, Gao and Zhao 1988, Gao et al. 1991, Lipkin et al.…”

Karyological Studies of Cladophoropsis (Siphonocladales, Chlorophyta) from Bermuda

“…Most previous demonstrations of photoperiodism in marine algae have involved responses to SD conditions in temperate (high latitude) genera such as Porphyr a and Bangia (Dring 1967), Richardson and Dixon 1968, L ning 1980, 1981, Kapraun and Lemus 1987 and Monostroma (Kornmann and Sahling 1977). However, LD responses have been reported as well (see Dring 1970 for a review), and are not unexpected in tropical (low latitude) taxa such as Cladophoropsis (Ray and Alexander 1966).…”