Marine Biology Terminology
Acronyms, abbreviations, and specialised technical terms of marine biology and oceanographic sciences.
WoRMS
World Register of Marine Species. International taxonomic reference database for the nomenclature of marine species, managed by a consortium of scientific institutions based at the Vlaams Instituut voor de Zee (VLIZ). URL: marinespecies.org. Every species is assigned a unique AphiaID.
AphiaID
Unique numeric identifier assigned by WoRMS to each marine taxon. Provides stable reference to scientific names even after nomenclatural revisions. Example: Posidonia oceanica has AphiaID 153813.
IUCN
International Union for Conservation of Nature. International organisation publishing the Red List of Threatened Species, classifying species by extinction risk (EX, EW, CR, EN, VU, NT, LC, DD, NE). URL: iucnredlist.org.
FishBase
Global database for bony and cartilaginous fish, curated by Froese & Pauly. Contains morphology, ecology, distribution, reproductive biology, and conservation status for > 35,000 fish species. URL: fishbase.org.
GFCM
General Fisheries Commission for the Mediterranean. FAO body for the sustainable management of fisheries in the Mediterranean and Black Seas. Sets catch quotas, closure periods, and Total Allowable Catches (TACs) for priority species.
ICCAT
International Commission for the Conservation of Atlantic Tunas. Regional fisheries management organisation (RFMO) for large pelagics in the Atlantic and Mediterranean, including bluefin tuna (Thunnus thynnus). Established by the Rio de Janeiro Treaty (1966).
PAR
Photosynthetically Active Radiation. Electromagnetic radiation in the 400–700 nm band (visible light) used by oxygenic photosynthesis. Attenuation in the water column depends on turbidity and follows Lambert–Beer law exponential decay.
HAB
Harmful Algal Bloom. Mass proliferation of microalgae (typically dinoflagellates or cyanobacteria) producing toxins or causing hypoxia. Includes PSP (Paralytic Shellfish Poisoning), DSP (Diarrhetic Shellfish Poisoning), ASP (Amnesic Shellfish Poisoning).
PSP
Paralytic Shellfish Poisoning. Intoxication caused by ingestion of bivalve molluscs contaminated with saxitoxins produced by dinoflagellates of the genus Alexandrium spp. Blocks sodium channels in neurons; potentially lethal.
DSP
Diarrhetic Shellfish Poisoning. Gastrointestinal syndrome caused by okadaic acid and dinophysistoxins from Dinophysis spp. Not fatal but debilitating; causes preventive closure of mussel farms.
TAC
Total Allowable Catch. Maximum annual catch quota fixed for a given species or stock by fisheries management bodies (GFCM, ICES, ICCAT). The primary tool of the EU Common Fisheries Policy (CFP).
SST
Sea Surface Temperature. Temperature of the uppermost ocean layer (typically the first 1–10 m), measured by satellites (MODIS, AVHRR sensors) or drifting buoys. A key indicator for monitoring oceanic climate warming.
CTD
Conductivity, Temperature, Depth. Standard oceanographic instrument measuring conductivity (from which salinity is derived), temperature, and depth continuously during vertical casts. Baseline data for characterising the hydrological structure of the water column.
ROV
Remotely Operated Vehicle. Tethered submersible vehicle connected to a research vessel, equipped with HD cameras, manipulators, and sensors. Used for deep habitat surveys (> 200 m) unreachable by divers.
AUV
Autonomous Underwater Vehicle. Self-propelled submersible programmed to follow pre-set routes, collect data (CTD, acoustics, fluorimetry), and return to base without real-time control. Extends sampling capability across open ocean.
MSFD
Marine Strategy Framework Directive. EU Directive 2008/56/EC requiring Member States to achieve Good Environmental Status (GES) of marine waters by 2020/2027. Structured around 11 Descriptors (D1–D11).
GES
Good Environmental Status. The state of marine waters achieved when ecosystems' structures, functions, and processes allow the sustainable use of ecosystem services and are not degraded by human impacts. Objective of the MSFD.
CMS
Convention on Migratory Species. International treaty (Bonn, 1979) for the conservation of threatened migratory animal species. Appendix I (critically endangered species, prohibition of taking) and Appendix II (species requiring conservation agreements). Covers cetaceans, sea turtles, and migratory elasmobranchs.
CITES
Convention on International Trade in Endangered Species. Washington Convention (1973) regulating international trade in at-risk species. Appendix I (absolute trade ban), Appendix II (controlled trade), Appendix III (unilateral protection). Relevant for Corallium rubrum, sharks, and sea turtles.
IBI
Index of Biotic Integrity. Multi-metric index assessing the biological integrity of an aquatic ecosystem by comparing the observed biological community with a reference community under minimum anthropogenic disturbance. Used within the EU WFD framework.
WFD
Water Framework Directive. EU Directive 2000/60/EC establishing a framework for protecting European waters (surface, groundwater, transitional, and coastal) aiming for Good Ecological Status by 2015 (since extended). Ecological classes: High, Good, Moderate, Poor, Bad.
N:P ratio
Molar nitrogen-to-phosphorus ratio in the water column, often compared against the Redfield ratio (16:1). A deviation indicates nitrogen limitation (N:P < 16) or phosphorus limitation (N:P > 16) for phytoplankton growth.
DIN
Dissolved Inorganic Nitrogen. Sum of dissolved inorganic nitrogen fractions (NO₃⁻ + NO₂⁻ + NH₄⁺) in the water column. Indicator of nitrogen availability for phytoplankton; key metric for monitoring coastal eutrophication.
MPQ
Mean Photosynthetic Quotient. Molar ratio of oxygen produced to CO₂ assimilated in phytoplankton photosynthesis; typical value 1.0–1.4, varying with cellular biochemical composition (proteins vs. lipids vs. carbohydrates).
TSI
Trophic State Index. Carlson's modified index (1977) applied to coastal waters to classify the degree of eutrophication based on chlorophyll a, transparency (Secchi depth), and total phosphorus.
EBSA
Ecologically or Biologically Significant Area. CBD (Convention on Biological Diversity) category for marine areas meeting criteria of uniqueness, rarity, life cycle importance, and vulnerability. EBSAs have no legal status but inform marine spatial planning.
MPA
Marine Protected Area. A designated marine area with restrictive measures on fishing, diving, or navigation to protect habitats, species, and ecological processes. In Italy, governed by Art. 36 of Law 394/1991.