BIOTIC

BIOTIC Species Information for Fucus serratus

Researched by

Angus Jackson

Data supplied by

MarLIN

Refereed by

Dr Graham Scott

Reproduction/Life History

Reproductive type

Gonochoristic

Developmental mechanism

Insufficient information

Reproductive Season

May to November

Reproductive Location

Water column

Reproductive frequency

Annual protracted

Regeneration potential

Life span

3-5 years

Age at reproductive maturity

Insufficient information

Generation time

Insufficient information

Fecundity

See additional information

Egg/propagule size

Insufficient information

Fertilization type

External

Larvae/Juveniles
Larval/Juvenile dispersal potential	>10km	Larval settlement period
Duration of larval stage	Insufficient information

Reproduction Preferences Additional Information

Dickinson, (1963) notes that fruiting fronds can be found almost throughout the year with fertile plants most in evidence during the winter months. However, most other work suggests that reproduction commences in late spring/early summer and continues through summer and autumn, peaking in August - October. Eggs and sperm are released into the water and fertilisation occurs in the water column. The eggs produce a sperm attractant called fucoserratin that is active within 0.5mm. The zygote then develops into a minute plant that can then settle onto the substratum. Post reproductive fronds are shed contributing to loss of surface cover. Many plants may be lost during winter due to storms and heavy wave action. Germlings have a high mortality, up to 83 % being recorded lost in 77 days on the Isle of Man. Reproduction occurs earlier and growth is faster on sheltered shores. Egg release is protracted. The largest number of receptacles recorded from a single plant is over 4,600. Eggs are broadcast into the water column to be carried by the current to settle and develop wherever they fall. Eggs attach firmly to the substratum within a few hours. Many eggs are eaten by browsing molluscs.

Reproduction References

Dickinson, 1963, Brenchley et al., 1997, Johnston, 1977, Williams, 1996, Knight & Parke, 1950,