BIOLOGY O F SEAWEEDS O F ECONOMIC IMPORTANCE
119
north, north-east, and east coasts of Scotland. Chapman (1948) gave
data for other parts of the coastline, e.g. :
1. South-west (Ayr to Garlieston)
9 100 tons of rockweed
3. East-north-east (Tarbat Ness to Sutors
4. South-east (Arbroath to Fifeness and
2. North-east (Berriedale to Brora)
2 400 9 , Y,
9 ,
of Cromarty)
11 700 9 , 9 ,
9 ,
Elie)
3 000 3 3 9 ,
9 9
Chapman’s data give estimates of the total standing crop of rockweed, whereas Gibb specifically chose areas of harvestable weed. For
example, the total rockweed for Mull was estimated by Chapman as
38 400 tons, whereas the harvestable weed was given by Gibb as 2 328
tons. This factor of distribution was also indicated in some further
data by Walker (1952b) :
Length of coastline surveyed
Standing crop of fucoid algae
Length of coastline bearing dense
Density of fucoid algae
5 300 miles
180 000 tons
stands of fucoid algae
540 miles
not less than 100 tonslacre
However, 92% of this quantity of rockweed was located in the
Outer Hebrides (70%) and the Orkney Islands (22%). From a commercial standpoint, whilst bulk estimates are an important guide, the
potentialities of an area in terms of ease of harvesting are also of great
importance.
Estimates of the standing crops of the sublittoral Laminaria
forests of the Scottish coastline are to be found in the extensive work
carried out by Walker and associates (refs. on p. 250). Some preliminary
work by Chapman (1948) gave the following results :
1. Girvan (Ayr to Garlieston)
49 000 tons of bottomweed
2. Outer Hebrides (west coast)
670900 ,, ,,
Y,
3. Orkney Islands
576370 ,, ,,
,,
4. Helmsdale (Berriedale to Brora)
52370 Y, 9 ,
9 7
and Elie)
117770 ,, ,,
9 )
5. St. Andrews (Arbroath to Fifeness
The tabular summary of the standing crops of Laminariaceaa
(Table IV) indicates also the areas on the Scottish coastline which are
harvestable in terms of the quantitative value of the seaweed.
119
north, north-east, and east coasts of Scotland. Chapman (1948) gave
data for other parts of the coastline, e.g. :
1. South-west (Ayr to Garlieston)
9 100 tons of rockweed
3. East-north-east (Tarbat Ness to Sutors
4. South-east (Arbroath to Fifeness and
2. North-east (Berriedale to Brora)
2 400 9 , Y,
9 ,
of Cromarty)
11 700 9 , 9 ,
9 ,
Elie)
3 000 3 3 9 ,
9 9
Chapman’s data give estimates of the total standing crop of rockweed, whereas Gibb specifically chose areas of harvestable weed. For
example, the total rockweed for Mull was estimated by Chapman as
38 400 tons, whereas the harvestable weed was given by Gibb as 2 328
tons. This factor of distribution was also indicated in some further
data by Walker (1952b) :
Length of coastline surveyed
Standing crop of fucoid algae
Length of coastline bearing dense
Density of fucoid algae
5 300 miles
180 000 tons
stands of fucoid algae
540 miles
not less than 100 tonslacre
However, 92% of this quantity of rockweed was located in the
Outer Hebrides (70%) and the Orkney Islands (22%). From a commercial standpoint, whilst bulk estimates are an important guide, the
potentialities of an area in terms of ease of harvesting are also of great
importance.
Estimates of the standing crops of the sublittoral Laminaria
forests of the Scottish coastline are to be found in the extensive work
carried out by Walker and associates (refs. on p. 250). Some preliminary
work by Chapman (1948) gave the following results :
1. Girvan (Ayr to Garlieston)
49 000 tons of bottomweed
2. Outer Hebrides (west coast)
670900 ,, ,,
Y,
3. Orkney Islands
576370 ,, ,,
,,
4. Helmsdale (Berriedale to Brora)
52370 Y, 9 ,
9 7
and Elie)
117770 ,, ,,
9 )
5. St. Andrews (Arbroath to Fifeness
The tabular summary of the standing crops of Laminariaceaa
(Table IV) indicates also the areas on the Scottish coastline which are
harvestable in terms of the quantitative value of the seaweed.