📍 B1B: Walkern Ford (upstream site)

River: Beane Catchment: Upper Lea (Hertfordshire) Filter(s): 40

Your Site at a Glance

165
Species Detected
135
Genera Identified
85
Families Found
631,783
DNA Sequences

How Your Site Compares

Metric Your Site Beane Average Study Average
Species 165 268 206
Genera 135 193 151
Families 85 103 83
EPT Families 2 5 6

Rank 7 of 10 on Beane Rank 57 of 81 in study

🌊 Water Quality Indicators

Moderate

BMWP score: 50 (Moderate) — ASPT score: 4.5 (Moderate)

11 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)
28 (17.0%)
2. Naididae (Aquatic Oligochaetes)
10 (6.1%)
3. Lumbricidae (Common Earthworms)
5 (3.0%)
4. Tipulidae (Crane Flies)
5 (3.0%)
5. Phalangiidae (Long-legged Harvestmen)
4 (2.4%)
6. Chrysomelidae (Leaf Beetles)
4 (2.4%)
7. Cyprinidae (Carp and Allies)
4 (2.4%)
8. Carabidae (Ground Beetles)
3 (1.8%)
9. Hydridae (Freshwater Hydras)
3 (1.8%)
10. Staphylinidae (Rove Beetles)
3 (1.8%)
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
11/33 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

7 fish species detected (6 families, 16 ESVs)
SpeciesFamilyESVs
Barbatula barbatula (Stone Loach) Nemacheilidae 6
Phoxinus phoxinus (Minnow) Cyprinidae 2
Cottus bairdii Cottidae 1
Gobio gobio (Gudgeon) Cyprinidae 1
Carassius auratus (Goldfish) Cyprinidae 1
Rutilus frisii Cyprinidae 1
Gasterosteus aculeatus (Three-spined Stickleback) Gasterosteidae 1

🪰 EPT Species (Mayflies, Stoneflies & Caddisflies)

2 EPT species detected (2 families, 5 ESVs — E:1 / P:0 / T:1)
SpeciesFamilyESVs
Ephemeroptera (Mayflies)
Baetis rhodani (Large Dark Olive) Baetidae 3
Trichoptera (Caddisflies)
Glyphotaelius pellucidus (Northern Caddisflies) Limnephilidae 1

🔗 Your Ecological Twin

Most similar site: B3 - Aston End (Aston Ford)
River: Beane (same river)
Similarity: 27% of species shared
Download Data

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

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