Environmental factors and commercial harvesting: exploring possible links behind the decline of the kelp Laminaria digitata in Brittany, France
Open accessAbstract
Over the last decade, the commercially harvested quantities of the kelp Laminaria digitata have decreased along the coast of Brittany, falling from an annual production of around 60,000 t to the current production of 50,000 t Environmental parameters and the intensity of harvesting are the main potential sources of this decline. To analyse the impact of the environment, several environmental factors such as temperature, light intensity and storm intensity were included in multivariate analyses to explore their potential effects on standing stock variables (density and biomass of L. digitata populations in north Finistère). Results show relatively limited temporal fluctuations in biomass and density, although density has generally increased since 2000. Biomass appeared to follow a periodic cycle of 12 years, but could not be linked to any environmental factor. Temperature seemed to have the largest effect (negative when it increases), although this effect was masked during the last years of the study period. Analyses on harvest data revealed that the lower landings of L. digitata were not correlated to a decrease in the available algal stock but to insufficient harvesting effort. This may be due to a decrease in the number of days spent harvesting kelp and in the number of kelp-harvesting vessels. While the production per vessel has increased since 2000, this increase was insufficient to increase or even maintain total production.
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Management plans for L. digitata are established according to available annual biomass and regulate the number of vessels by harvesting area, the starting period of the harvesting season and the number of harvesting days per week.
“These plans are established in accordance to the available annual biomass and regulate the number of vessels by harvesting area, the starting period of the harvesting season and the number of harvesting days per week.”
From Current Status of the Algae Production Industry in Europe: An Emerging Sector of the Blue Bioeconomy (2021) · cites this paper as Davoult et al., 2011
Laminaria digitata is traditionally harvested from May to September following quotas established by management plans.
“Laminaria digitata is traditionally harvested from May to September following quotas established by management plans.”
From Current Status of the Algae Production Industry in Europe: An Emerging Sector of the Blue Bioeconomy (2021) · cites this paper as Davoult et al., 2011
In Brittany, kelp species harvesting is traditionally carried out by a fleet of small vessels operating seasonally.
“In Brittany, the most critical seaweed production region in France ( Figure 3A ), kelp species harvesting is traditionally carried out by a fleet of small vessels operating seasonally.”
From Current Status of the Algae Production Industry in Europe: An Emerging Sector of the Blue Bioeconomy (2021) · cites this paper as Davoult et al., 2011
L. hyperborea areas are harvested between the beginning of September and mid-May, but autumn biomass removals represent 75 to 80% of the total annual volume of harvested algae biomass.
“These areas are harvested between the beginning of September and mid-May, but the autumn biomass removals represent 75 to 80% of the total annual volume of harvested algae biomass.”
From Current Status of the Algae Production Industry in Europe: An Emerging Sector of the Blue Bioeconomy (2021) · cites this paper as Davoult et al., 2011
Harvesting of L. hyperborea is managed by quotas established for areas which open every 3 years.
“Similarly, the harvesting of L. hyperborea is also managed by quotas established for areas which open every 3 years.”
From Current Status of the Algae Production Industry in Europe: An Emerging Sector of the Blue Bioeconomy (2021) · cites this paper as Davoult et al., 2011
L. digitata is the main exploited species in France where it is collected seasonally, while L. hyperborea is the main species exploited in areas such as Norway where it is harvested all year-round.
“L. digitata is the main exploited species in France where it is collected seasonally (Alban et al., 2011; Davoult et al., 2011), while L. hyperborea is the main species exploited in areas such as Norway where it is harvested all year-round (Frangoudes, 2011; Vea and Ask, 2011).”
From Current Status of the Algae Production Industry in Europe: An Emerging Sector of the Blue Bioeconomy (2021) · cites this paper as Davoult et al., 2011
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Current Status of the Algae Production Industry in Europe: An Emerging Sector of the Blue Bioeconomy
Araújo, R., Vázquez Calderón, F., Sánchez López, J., Azevedo, I. C., Bruhn, A., Fluch, S., Garcia Tasende, M., Ghaderiardakani, F., Ilmjärv, T., Laurans, M., et al. (2021) · Frontiers in Marine Science · doi:10.3389/fmars.2020.626389 · Cited by 653 · see citing works
Self-citation
- Authors
- DAVOULT, D., ENGEL, C. R., ARZEL, P., KNOCH, D., & LAURANS, M.
- Affiliations
- Laboratoire d'Ecogéochimie des Environnements Benthiques (FR)
- Venue
- Station Biologique de Roscoff (SBR)
- Publisher
- Station Biologique de Roscoff (SBR)
- Published
- 2011
- Volume
- 52
- Issue
- 4, SI
- Pages
- 429-434
- OpenAlex
- W2900290681
- Cited by
- 24
- References
- 0
- Citations by year
- 2024: 1 · 2023: 2 · 2022: 3 · 2021: 3 · 2019: 1 · 2017: 2 · 2016: 3 · 2015: 6 · 2014: 1 · 2013: 1
- FWCI
- 0.68
- Type
- journal article
- Language
- en
- Open access
- green
- archimer.ifremer.fr
- Licence
- other-oa
- Locations
- HAL (submittedVersion)
- Institutional Archive of Ifremer (French Research Institute for Exploitation of the Sea) (submittedVersion, other-oa)
- Cahiers de biologie marine
- Topics
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal plant biology
- Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Seaweed-derived Bioactive Compounds
- Physical Sciences › Environmental Science › Global and Planetary Change › Marine and fisheries research
- Keywords
- Laminaria digitata, kelp decline, seaweed harvesting, commercial landings, environmental factors, sea surface temperature, light intensity, storm intensity, kelp biomass, population density, harvesting effort, Finistère, Brittany
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