Activators and inhibitors of the motility of Fucus Serratus

Hybridization and introgression in a mixed population of the intertidal seaweeds Fucus evanescens and F. serratus.

The introduced Fucus evanescens (hermaphroditic) and the native F. serratus (dioecious) have been in secondary contact along the Danish coast of the Kattegat Sea for 60-100 years and dioecious hybrids have been observed at Blushøj for several years. Hybridization in Fucus is unusual because it appears to always involve a hermaphroditic and a dioecious parental pair. We determined the degree and...

Nature of the distributional boundary of Fucus serratus on the north shore of Spain

The distribution of Fucus serratus has a sharp boundary In northern S p a n F serratus dominates the m ~ d ~ n t e r t ~ d a l l e g ~ o n west of Novellana, Asturias but is absent further east In a short t r ans~ t~on zone F serratus 1s abundant within patches The causes underlying this pattern were investlgated by exper~rnental transplants of F serratus to locations In the transit~on zone and...

Effect of Activators and Inhibitors on Lactase Activities to Determine its Kinetic Model

Fertilization in brown algae. II. Evidence for lectin-sensitive complementary receptors involved in gamete recognition in Fucus serratus.

Fertilization in Fucus serratus is directly proportional to the number of sperm added, saturating at approximately 250 sperm per egg with an apparent Km of 120 sperm per egg. The effect of a range of lectins on fertilization has been tested. Preincubation of gametes with Con A and fucose-binding protein (FBP) inhibited fertilization. At low concentrations this was by specifically binding to egg...

Physiological responses of intertidal marine brown algae to nitrogen deprivation and resupply of nitrate and ammonium.

Intertidal macroalgae Fucus and Laminaria experience seasonally fluctuating inorganic N supply. This study examined the effects of long-term N deprivation, recovery following N resupply, and effects of elevated ammonium and nitrate exposure on N acquisition in intertidal algae using manipulations of N supply in tank culture. Over 15 weeks of N deprivation, internal N and nitrate reductase activ...