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Recovery following experimental harvesting of Laminaria longicruris and L. digitata in southwestern Nova Scotia

Journal Article:

Abstract

Laminaria population variables and understory community composition were monitored just prior to, and for two summers following, a September 1980 experimental total harvest of L. longicruris De la Pylaie and L. digitata (L.) Lamouroux within two plots in Lobster Bay, Nova Scotia. Both plots, distinguished mainly by depth, were characterized by high Laminaria standing crop and no recent history of extensive sea urchin grazing. Within the shallower plot (2-3 m below MSL), recovery could not be assessed thoroughly due to ice damage, but within the deeper plot (3-4 m below MSL), L. longicruris regrew cropped biomass and attained maximum observed abundance within one year. Both Laminaria species required two years to mature to pre-harvest population characteristics. Survivorship of 0-1 year old and mature populations of both species was generally low (0-67% per year); however, the higher maximum life expectancy of L. digitata (>4 years vs 2 years) can result in that species persisting to the disadvantage of L. longicruris. Analysis of understory community composition for both harvested plots and their adjacent controls weakly distinguished the harvested plots one summer after harvesting from all others. It is doubtful the distinction is attributable to harvesting and in neither site was there evidence  More>>
Authors:
Publication Date:
Jan 01, 1985
Product Type:
Journal Article
Reference Number:
DE-87-014763; EDB-87-177482
Resource Relation:
Journal Name: Helgol. Wiss. Meeresunters.; (Germany, Federal Republic of); Journal Volume: 39:1
Subject:
09 BIOMASS FUELS; 54 ENVIRONMENTAL SCIENCES; BIOMASS; LAMINARIA; HARVESTING; AQUACULTURE; ATLANTIC OCEAN; CANADA; CELL CULTURES; DEPTH; NOVA SCOTIA; SEAWATER; ALGAE; AQUATIC ORGANISMS; DIMENSIONS; ENERGY SOURCES; HYDROGEN COMPOUNDS; NORTH AMERICA; OXYGEN COMPOUNDS; PLANTS; RENEWABLE ENERGY SOURCES; SEAS; SEAWEEDS; SURFACE WATERS; WATER; 140504* - Solar Energy Conversion- Biomass Production & Conversion- (-1989); 520100 - Environment, Aquatic- Basic Studies- (-1989)
OSTI ID:
5987163
Research Organizations:
Nova Scotia Dept. of Fisheries, Halifax, Canada
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: HELOA
Submitting Site:
DE
Size:
Pages: 83-101
Announcement Date:

Journal Article:

Citation Formats

Smith, B D. Recovery following experimental harvesting of Laminaria longicruris and L. digitata in southwestern Nova Scotia. Germany: N. p., 1985. Web.
Smith, B D. Recovery following experimental harvesting of Laminaria longicruris and L. digitata in southwestern Nova Scotia. Germany.
Smith, B D. 1985. "Recovery following experimental harvesting of Laminaria longicruris and L. digitata in southwestern Nova Scotia." Germany.
@misc{etde_5987163,
title = {Recovery following experimental harvesting of Laminaria longicruris and L. digitata in southwestern Nova Scotia}
author = {Smith, B D}
abstractNote = {Laminaria population variables and understory community composition were monitored just prior to, and for two summers following, a September 1980 experimental total harvest of L. longicruris De la Pylaie and L. digitata (L.) Lamouroux within two plots in Lobster Bay, Nova Scotia. Both plots, distinguished mainly by depth, were characterized by high Laminaria standing crop and no recent history of extensive sea urchin grazing. Within the shallower plot (2-3 m below MSL), recovery could not be assessed thoroughly due to ice damage, but within the deeper plot (3-4 m below MSL), L. longicruris regrew cropped biomass and attained maximum observed abundance within one year. Both Laminaria species required two years to mature to pre-harvest population characteristics. Survivorship of 0-1 year old and mature populations of both species was generally low (0-67% per year); however, the higher maximum life expectancy of L. digitata (>4 years vs 2 years) can result in that species persisting to the disadvantage of L. longicruris. Analysis of understory community composition for both harvested plots and their adjacent controls weakly distinguished the harvested plots one summer after harvesting from all others. It is doubtful the distinction is attributable to harvesting and in neither site was there evidence of a critical change in the understory community. Management implications for the commercial harvest of the brown alga Laminaria are discussed.}
journal = {Helgol. Wiss. Meeresunters.; (Germany, Federal Republic of)}
volume = {39:1}
journal type = {AC}
place = {Germany}
year = {1985}
month = {Jan}
}