Table 2.
Summary of current knowledge and data availability for UK species
| Location | Species group | Abundance | Distribution | Trend |
|---|---|---|---|---|
| Terrestrial and freshwater | Micro‐organisms | − | + | − |
| Fungi | − | + | − | |
| Algae | + | + | + | |
| Lichens | + | + | ++ | |
| Bryophytes | + | ++ | ++ | |
| Higher plants | + | ++ | ++ | |
| Invertebrates (freshwater) | ++ | ++ | ++ | |
| Invertebrates (terrestrial) | + | + | + | |
| Fish (freshwater) | + | ++ | + | |
| Amphibians | − | + | + | |
| Reptiles | − | + | + | |
| Birds | ++ | ++ | ++ | |
| Mammals | + | + | + | |
| Marine | Phytoplankton | − | ++ | ++ |
| Algae (marine) | + | + | + | |
| Invertebrates (marine) | + | + | + | |
| Fish (marine) | ++ | ++ | ++ | |
| Seabirds | + | + | + | |
| Mammals (marine) | + | + | + |
−, little or no data; +, data inconsistently collected across components, time or space; ++, good data at appropriate spatial or temporal scales.