studies on the brown alga dictyopteris longifolia (Dictyotales), with special reference to the effects of wave action

[摘要] Aspects of the brown alga Pict~'ppt;eris lQ..n..qifolia at. PalmBeach, Natal, were investigated wi\'-;.hspecial reference tothe effect of wave expozu~e~A description of the species is giv~n and thenomencluture discussed. D~strib1i.ltion of n. ).or~gifolia wasdet~rmimad from literature and herbarium speof.mens .various r(\~:~thodosf measuring wave exposure were assessedand review~~d. At'!;:.emptswere made to quantify sandabrasion and deposition in tihe scudy si.tes.Morphological and structural aspect;s of the cha LLus werefound to vary considerably with season and wave exposureLight and scanning electron microscopy studie.s indicatedthe relatjvely complex cell organisation of this brownalga.The prolific regeneration from various thallus sectionsof .Q. longifolia indicate that regenerat.ion is animportant survival strate 'JY following damage.Sexual reproduction and tetrasporogenesis wereinvestigated. Sex.ual reproduction was not prolific in thefield, however, tetraspores were abundant and arebelieved to be particul~rly importcmt in high waveexposure areas.11. _j.Q.ngi;f'clige,x_periences a range of environmentalconditions and responds to these with morphological,structural and reproductive &daptations.

[发布机构] University of the Witwatersrand