The effects of insolation and grazing on populations of the splash zone alga Prasiola meridionalis (Chlorophyta)

Primary tabs

Anderson, B. S., & Foster, M. S. (1999). The effects of insolation and grazing on populations of the splash zone alga Prasiola meridionalis (Chlorophyta). Phycologia, 38(5), 349-355.
Metadata
TitleThe effects of insolation and grazing on populations of the splash zone alga Prasiola meridionalis (Chlorophyta)
AuthorsB. Anderson, M. Foster
AbstractField experiments at two sites assessed the effects of insolation and gastropod grazing on the distribution and abundance of Prasiola meridionalis Setchell et Gardner, a green alga that occurs in the upper splash zone (supralittoral) on guano-covered rocks. At site 1, a sun-exposed horizontal rock where the alga occurs seasonally and grazers were rare, blades appeared in the early spring and died back in early summer. Lack of gastropod grazers and persistence of blades in experimentally shaded plots showed that increased insolation or some associated factor (or factors) was responsible for temporal variation at this site. At site 2, the alga grew in a distinct, perennial band on a shaded vertical rock face with abundant gastropod grazers. These grazers were excluded from long vertical plots that extended from the lower portion of the P. meridionalis band down to a zone of the red alga Endocladia muricata (Postels et Ruprecht) J. Agardh more than 2 m below. The results showed that grazing set the proximate lower limit of P. meridionalis at site 2, and variation in the abundance of the alga within its zone at this site was associated with seasonal climate changes and feeding by mites. Thus, while insolation and grazing can both affect populations of P. meridionalis, their relative importance varied between sites.
JournalPhycologia
Date1999
Volume38
Issue5
Start page349
End page355
ISSN00318884
SubjectsPrasiola meridionalis
NoteCited By (since 1996):4, Seaweeds, CODEN: PYCOA

Bookmark

Bookmarks: