Physical factors driving intertidal macroalgae distribution: physiological stress of a dominant fucoid
at its Southern limit.
The two fucoid
species which recruited (Fucus spiralis and Fucus vesiculosus) could not be distinguished due to their small size so their numbers were pooled.
The growth and gonad production of Hemicentrotus pulcherrimus, which is commercially harvested in western Japan, were greatest in fucoid
beds, lower in beds dominated by the small red algae Acrosorium polyneurum and Chondrus spp.
Crustacea: Cirripedia) and three species of fucoid
Although Hewatt did not record algal species as thoroughly as invertebrates, we were able to document a massive decline in cover of Pelvetia compressa, a cosmopolitan fucoid
alga that is typically more common in the southern part of its range.
We recently demonstrated that high water motion inhibits gamete release in fucoid
algae (Serrao et al.
The intertidal zone is characterized by luxuriant canopies of fucoid
algae (Fucus vesiculosus, F.
Near the proximal end of the peninsula is a boulder field protected from wave action that is dominated by the fucoid
alga, Ascophyllum nodosum.
In our region, they occupy beds of the fucoid
alga known as rockweed (Ascophyllum nodosum) in the intertidal zone where they feed on amphipods, copepods, and other invertebrates (Rangeley and Kramer 1995a).
1994), as well as in algal protists, among the fucoid
seaweeds (Brawley, 1991).
Effects of grazers and algal competitors on fucoid
colonization in tide pools.
Calcium buffer injections block fucoid
egg development by facilitating calcium diffusion.
Briefly, classic zonation patterns are observed at BB: a high intertidal zone dominated by fucoid
algae and barnacles, a mid-intertidal zone dominated by mussels (Mytilus californianus), and a low zone dominated by a mosaic of seaweeds and surfgrass species.
Thus, for example, a nonprey fucoid
alga provided a habitat for ephemeral algae, the major food of littorine snails, and thereby indirectly helped maintain high snail density (e.
Some of the complex sugars in seaweed are referred to as fucoids
(glucans), which may stimulate immune function.