Endangered and critically endangered marine mammal species whose migratory routes are crossed
Measurement answer
What this metric measures
Reports the number of Critically Endangered or Endangered marine mammal species whose IUCN-listed migratory routes are crossed by the organisation's ships.
Specification
Metric specification
- Result format
- Single value
- Unit
- number of marine mammal species — source-defined reporting unit
- Reporting basis
- Reporting period
- Aggregation
- Count of distinct marine mammal species meeting the specified IUCN-status and route-crossing criteria
- Pillar
- Environmental
- Topic
- Nature
- Controlled domain
- Nature, biodiversity and land
- Entity type
- Metric
Reporting boundary
Marine mammal species whose migratory routes are crossed by ships through the organisation's routing activities
Verified source occurrences
Framework coverage
This is one canonical metric. The bindings below show every verified framework occurrence without creating duplicate metric pages. Edition, disclosure, role, and relationship remain source-specific.
- Adopting DisclosureSource evidence
TNFD sector guidance
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- Final English sector guidance collection through August 2026 (17 documents)
- Requirement
- Not Specified
- Relationship
- Defines Disclosure
- Mapping outcome
- Direct Evidence
- Source locator
- TNFD additional sector guidance, Section 3.3, Table 16, p. 73; State of nature: Species extinction risk; indicator: Marine mammal species extinction risk. | p. 73, Section 3.3, Table 16
- Adopting DisclosureMT.A5.0
TNFD sector guidance
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- Version 1.0, June 2025
- Requirement
- Recommended
- Relationship
- Maps Source Identity
- Mapping outcome
- Published
- Source locator
- p. 73, Section 3.3, Table 16
Value structure
Dimensions and units
- Unit
- number of marine mammal species — source-defined reporting unit
- Reporting basis
- Reporting period
Unit meaning: Values use number of marine mammal species under the disclosed TNFD sector-guidance method, reporting period and boundary.
Table fields and units
- Marine mammal species
- IUCN extinction-risk classification
- Migratory-route crossing determination
Published dimensions
- IUCN extinction-risk classification
- Marine mammal species
- Ship-routing interaction
Calculation method
Formula information
- Status
- Specified
- Formula type
- Count
Formula
M = count of distinct marine mammal species classified by IUCN as Critically Endangered or Endangered whose migratory routes are crossed by the organisation's shipsApply the source-defined TNFD sector-guidance method within the stated reporting boundary. This is a standalone TNFD additional sector state-of-nature count with a defined population, eligibility criterion and reportable unit. It is narrower than the existing affected-species-by-IUCN-extinction-risk construct because it is specifically limited to marine mammals, qualifying IUCN categories and ship-routing crossings.
Variables
| Symbol | Variable | Definition | Unit |
|---|---|---|---|
M | Marine mammal species extinction-risk count | Number of distinct marine mammal species meeting the IUCN-status and ship-routing interaction criteria. | number of marine mammal species |
Verified sources
Evidence and status sources
Sustopedia checked each record-specific claim directly against primary publisher material. Labels distinguish current measurement authority from future compatibility and corroborative, legal, edition, or method status context. Corroborative evidence can support a stated limitation but cannot establish the core measurement by itself.
Measurement evidence
- Measurement evidenceChecked 30 August 2026
TNFD additional sector guidance collection
- Publisher
- Taskforce on Nature-related Financial Disclosures
- Edition
- Final English sector guidance collection through August 2026 (17 documents)
- Locator
- TNFD additional sector guidance, Section 3.3, Table 16, p. 73; State of nature: Species extinction risk; indicator: Marine mammal species extinction risk. | p. 73, Section 3.3, Table 16
Supports: The official TNFD sector guidance supports the identity, boundary and method basis of “Endangered and critically endangered marine mammal species whose migratory routes are crossed”.
Open official source
Use with context
Interpretation boundaries
Method disclosures required
Source-edition basis: TNFD sector guidance, Final English sector guidance collection through August 2026 (17 documents).
- State the IUCN source, assessment version and date used to identify Critically Endangered and Endangered species.
- Describe the source and method used to delineate marine mammal migratory routes.
- Describe the ship-routing data, period and route-crossing test used.
- State whether the count is of unique species and how duplicate route crossings are treated.
Record-specific limitations
- The result depends on the IUCN assessment status and version used.
- The result depends on available delineation of marine mammal migratory routes and the routing data assessed.
- The metric is limited to species classified as Critically Endangered or Endangered.
Interpret this metric with the stated reporting boundary, period convention, value shape, and unit. Results prepared with different boundaries or conventions may not be directly comparable.
Measurement evidence supports the core record-specific claims described above. Corroborative evidence can support limitations, while compatibility and status sources provide their separately labelled context. None of these cards by itself determines an organisation's legal applicability, filing readiness, assurance status, or compliance conclusion.