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EUNIS habitat's thresholds for the Western coast of the Iberian Peninsula — A Portuguese case study
- Source :
- Repositório Científico de Acesso Aberto de Portugal, Repositório Científico de Acesso Aberto de Portugal (RCAAP), instacron:RCAAP
- Publication Year :
- 2015
- Publisher :
- Elsevier BV, 2015.
-
Abstract
- The European Nature Information System (EUNIS) has been implemented for the establishment of a marine European habitats inventory. Its hierarchical classification is defined and relies on environmental variables which primarily constrain biological communities (e.g. substrate types, sea energy level, depth and light penetration). The EUNIS habitat classification scheme relies on thresholds (e.g. fraction of light and energy) which are based on expert judgment or on the empirical analysis of the above environmental data. The present paper proposes to establish and validate an appropriate threshold for energy classes (high, moderate and low) and for subtidal biological zonation (infralittoral and circalittoral) suitable for EUNIS habitat classification of the Western Iberian coast. Kineticwave-induced energy and the fraction of photosynthetically available light exerted on the marine bottom were respectively assigned to the presence of kelp (Saccorhiza polyschides, Laminaria hyperborea and Laminaria ochroleuca) and seaweed species in general. Both data were statistically described, ordered fromthe largest to the smallest and percentile analyseswere independently performed. The threshold between infralittoral and circalittoral was based on the first quartile while the ‘moderate energy’ class was established between the 12.5 and 87.5 percentiles. To avoid data dependence on sampling locations and assess the confidence interval a bootstrap technique was applied. According to this analysis,more than 75% of seaweeds are present at locations where more than 3.65% of the surface light reaches the sea bottom. The range of energy levels estimated using S. polyschides data, indicate that on the IberianWest coast the ‘moderate energy’ areas are between 0.00303 and 0.04385 N/m2 of wave-induced energy. The lack of agreement between different studies in different regions of Europe suggests the need for more standardization in the future. However, the obtained thresholds in the present study will be very useful in the near future to implement and establish the Iberian EUNIS habitats inventory. info:eu-repo/semantics/publishedVersion
- Subjects :
- biology
Range (biology)
Saccorhiza polyschides
Kelp
Biological zonation
Sampling (statistics)
Seaweeds
Aquatic Science
Oceanography
biology.organism_classification
Substrate (marine biology)
Kinetic wave energy
Habitat mapping
Laminaria hyperborea
Available light
Habitat
EUNIS classification
Environmental science
Thresholds
Ecology, Evolution, Behavior and Systematics
Subjects
Details
- ISSN :
- 13851101
- Volume :
- 100
- Database :
- OpenAIRE
- Journal :
- Journal of Sea Research
- Accession number :
- edsair.doi.dedup.....60e92910c7c8bbf14e791eca3bb1208b