The French Atlantic Coasts
253
Fig. 9.2. Unattached forms of green tide Ulva sp. forming a distinct floating belt at low
tide along the beach, Bay of Lannion, Brittany. The belt can be 20 to 200 m wide. Note
the breaking swell concentrating the seaweed in the very shallow nearshore waters (0 to 1
m depth). Aerial infrared photograph, IFREMER
Fig. 9.3. Stranded biomass of green tide forming Ulva sp
column, such degradation could cause a dystrophic crisis (i.e. oxygen
consumption and depletion) at the end of the growth period, as has been
observed in shallow closed lagoons (e.g. Mediterranean pools, Venice
lagoon: see Chap. 15, this vol). In green tide-infested areas of the "open
253
Fig. 9.2. Unattached forms of green tide Ulva sp. forming a distinct floating belt at low
tide along the beach, Bay of Lannion, Brittany. The belt can be 20 to 200 m wide. Note
the breaking swell concentrating the seaweed in the very shallow nearshore waters (0 to 1
m depth). Aerial infrared photograph, IFREMER
Fig. 9.3. Stranded biomass of green tide forming Ulva sp
column, such degradation could cause a dystrophic crisis (i.e. oxygen
consumption and depletion) at the end of the growth period, as has been
observed in shallow closed lagoons (e.g. Mediterranean pools, Venice
lagoon: see Chap. 15, this vol). In green tide-infested areas of the "open