C4a: UK Priority Species Relative Abundance Trends, 2012
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Description
The UK Biodiversity Indicator C4a dataset from the Joint Nature Conservation Committee tracks relative population changes for 213 priority species. It includes 101 birds, 21 butterflies, 12 mammals, and 79 moths, drawn from a combined list of 2,890 species of high conservation concern. The latest data point is for 2012, published in January 2016.
Use Cases
Modeling population trends for priority species based on relative abundance time-series data.
Assessing conservation status and progress for UK biodiversity strategies based on the indicator methodology.
Comparing population changes across taxonomic groups like birds, butterflies, mammals, and moths.
Identifying data gaps for priority species lacking robust quantitative time series.
Strengths
Includes 213 species with robust quantitative time series of relative abundance.
Covers a defined list of 2,890 priority species from UK country biodiversity strategies.
Provides a specific taxonomic breakdown: 101 birds, 21 butterflies, 12 mammals, and 79 moths.
Limitations
Taxonomic coverage is limited; it includes no plants, fungi, amphibians, reptiles, fish, or invertebrates other than butterflies and moths.
The latest data point is from 2012, which may limit analysis of recent trends.
Column-level documentation is absent; field semantics must be inferred after download.
Provenance
Source
Joint Nature Conservation Committee (JNCC) on behalf of Defra.
Collection Method
Indicator methodology detailed in a supporting technical document; data compiled from available population abundance time series for priority species.
Time Range
Time series up to 2012.
Freshness
Last updated 2026-04-14 09:45:50.631435; freshness should be verified.