Overview
EN ISO 19493:2007 / ISO 19493:2007 - Water quality: Guidance on marine biological surveys of hard-substrate communities - is a CEN-adopted international standard that defines minimum requirements for conducting marine biological surveys on hard substrates in coastal zones. The standard covers surveys of the supralittoral, eulittoral and sublittoral zones and is intended for environmental impact assessment and routine environmental monitoring. It emphasizes non‑destructive, field-based techniques (direct recording and photography) and standardizes program design, survey methods, species identification and data/material storage.
Key topics and technical requirements
- Scope and targets
- Hard substrate defined as bedrock, stable rocks and fixed marine constructions; also applicable to some stable loose substrates and seagrass epiflora/epifauna.
- Focus on macroscopic organisms visible without magnification (≥ ~1 mm).
- Survey design
- Development of a sampling programme including sampling stations, reference stations, baseline surveys and temporal trend monitoring.
- Consideration of abiotic drivers (wave exposure, depth, salinity, substrate type) when selecting sites.
- Recording methods
- Semi‑quantitative and quantitative techniques that minimize destruction: visual field recording, standardized photographic documentation.
- Explicit exclusion of destructive sampling as the standard method (scraping, suction sampling) - these may be used only as supplements.
- Taxonomy and data
- Guidance on species identification, sample processing and secure storage of biological material and metadata to ensure intercomparability.
- Quality, safety and logistics
- Minimum quality assurance, health and safety requirements for fieldwork and laboratory processing.
- Requirements for diving operations, use of ROVs and risk assessment procedures.
- Supporting material
- Annexes include method descriptions, field recording forms, biological zone definitions and tools (e.g., exposure calculations).
Practical applications
- Environmental Impact Assessment (EIA) for coastal development (ports, pipelines, quays).
- Baseline and long‑term monitoring of coastal hard‑substrate communities for pollution, habitat change or management effectiveness.
- Monitoring for marine protected areas (MPAs), restoration projects and seagrass/epifauna assessments.
- Standardizing inter‑operator and temporal comparability for regulatory reporting and research.
Who should use this standard
- Marine ecologists, environmental consultants and contractors performing coastal surveys.
- Regulatory agencies and water quality authorities setting monitoring programs.
- Academic researchers and conservation bodies conducting coastal biodiversity assessments.
Related standards
- ISO 5667-19 - sediment sampling in marine areas (referenced for sediment work).
- ISO 16665 - surveys of sublittoral soft‑bottom fauna.
- National/international scientific diving standards for safe diving practices.
Keywords: ISO 19493:2007, EN ISO 19493:2007, marine biological surveys, hard-substrate communities, water quality, environmental monitoring, coastal monitoring, environmental impact assessment.