📍 C1: Queens Head (upstream site)

River: Chess Catchment: Colne Filter(s): 41

Your Site at a Glance

82
Species Detected
68
Genera Identified
45
Families Found
74,966
DNA Sequences

How Your Site Compares

Metric Your Site Chess Average Study Average
Species 82 197 206
Genera 68 146 151
Families 45 84 83
EPT Families 3 6 6

Rank 9 of 10 on Chess Rank 73 of 81 in study

🌊 Water Quality Indicators

Moderate

BMWP score: 55 (Moderate) — ASPT score: 4.2 (Moderate)

13 scoring macroinvertebrate families detected

Water quality is moderately impacted; some pollution-sensitive families are present but diversity is limited.

🔍 Notable Findings

Conservation Species:

Invasive Species:

🦋 Top 10 Families at Your Site

1. Chironomidae (Non-biting Midges)
18 (22.0%)
2. Naididae (Aquatic Oligochaetes)
9 (11.0%)
3. Simuliidae (Black Flies)
4 (4.9%)
4. Lumbricidae (Common Earthworms)
3 (3.7%)
5. Gammaridae (Freshwater Shrimps)
2 (2.4%)
6. Salmonidae (Salmon and Trout)
2 (2.4%)
7. Anatidae (Ducks, Geese, and Swans)
2 (2.4%)
8. Rallidae (Rails, Crakes, and Coots)
2 (2.4%)
9. Hydridae (Freshwater Hydras)
2 (2.4%)
10. Planorbidae (Ramshorn Snails)
2 (2.4%)
Taxonomic composition

🪲 Extended Riverfly Taxa

1 Flatworms ✓ 18Dragonflies and Damselflies✗
2 Freshwater Snails ✓ 19Water Boatmen✓
3 Limpets ✗ 20Other Water Bugs✓
4 Bivalves ✗ 21Water Beetles✓
5 Aquatic Worms ✓ 22Alderflies✓
6 Leeches ✓ 23Caseless Caddisflies - Green Sedge✗
7 Crayfish ✗ 24Caseless Caddisflies - Net Spinners✗
8 Water Hoglouse ✓ 25Caseless Caddisflies - Non-Gilled✗
9 Freshwater Shrimps ✓ 26Cased Caddisflies - Hood Case-Maker✗
10 Invasive Non-Native Shrimps ✗ 27Cased Caddisflies - Weighted Case-Maker✓
11 Mayflies - Angler's Curse ✗ 28Cased Caddisflies - Bush Tailed Caddisfly✗
12 Mayflies - Olives ✓ 29Cased Caddisflies - Other✗
13 Mayflies - Prong Gilled ✗ 30Craneflies✗
14 Mayflies - Flatbodied ✗ 31Blackflies✓
15 Mayflies - Green Drake ✗ 32Non-Biting Midges✓
16 Mayflies - Blue-Winged Olive ✗ 33Water Snipe Flies✗
17 Stoneflies ✗
14/33 Extended Riverfly taxa detected

Note: The Extended Riverfly Monitoring Initiative calculates scores based on abundance categories, which cannot be determined from eDNA presence/absence data. This checklist shows which taxa groups were detected but does not constitute an official ARMI score.

🐟 Fish Species

5 fish species detected (4 families, 10 ESVs)
SpeciesFamilyESVs
Gasterosteus aculeatus (Three-spined Stickleback) Gasterosteidae 3
Salmo trutta (Brown Trout / Sea Trout) Salmonidae 2
Phoxinus phoxinus (Minnow) Cyprinidae 2
Cottus bairdii Cottidae 1
Thymallus arcticus Salmonidae 1

🪰 EPT Species (Mayflies, Stoneflies & Caddisflies)

3 EPT species detected (3 families, 4 ESVs — E:1 / P:0 / T:2)
SpeciesFamilyESVs
Ephemeroptera (Mayflies)
Baetis rhodani (Large Dark Olive) Baetidae 1
Trichoptera (Caddisflies)
Glyphotaelius pellucidus (Northern Caddisflies) Limnephilidae 2
Apatania cimbrica (Apataniid Caddisflies) Apataniidae 1

🔗 Your Ecological Twin

Most similar site: C2 - Upstream Chesham Moor on main channel (2 Lords Mill)
River: Chess (same river)
Similarity: 30% of species shared
Download Data

82 Species detected at this site — CSV format, opens in Excel

Project logos

eDNA Biodiversity Survey - Geneflow Project | Generated: 01 February 2026

Thank you for contributing to chalk stream biodiversity monitoring!