📍 MM8: Tewinbury Farm

River: Mimram Catchment: Upper Lea (Hertfordshire) Filter(s): 105

Your Site at a Glance

292
Species Detected
208
Genera Identified
97
Families Found
790,725
DNA Sequences

How Your Site Compares

Metric Your Site Mimram Average Study Average
Species 292 204 206
Genera 208 151 151
Families 97 77 83
EPT Families 12 8 6

Rank 1 of 10 on Mimram Rank 11 of 81 in study

🌊 Water Quality Indicators

Very Good

BMWP score: 158 (Very Good) — ASPT score: 6.3 (Excellent)

25 scoring macroinvertebrate families detected

Near-natural conditions with an unpolluted, diverse macroinvertebrate community.

🔍 Notable Findings

Conservation Species:

Invasive Species:

🦋 Top 10 Families at Your Site

1. Chironomidae (Non-biting Midges)
66 (22.6%)
2. Naididae (Aquatic Oligochaetes)
37 (12.7%)
3. Lumbricidae (Common Earthworms)
10 (3.4%)
4. Enchytraeidae (Potworms)
10 (3.4%)
5. Psychodidae (Moth Flies)
8 (2.7%)
6. Cyclopidae (Cyclopoid Copepods)
6 (2.1%)
7. Isotomidae (Isotomid Springtails)
5 (1.7%)
8. Limoniidae (Limoniid Crane Flies)
5 (1.7%)
9. Limnephilidae (Northern Caddisflies)
5 (1.7%)
10. Empididae (Dance Flies)
4 (1.4%)
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
22/33 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 (5 families, 29 ESVs)
SpeciesFamilyESVs
Gasterosteus aculeatus (Three-spined Stickleback) Gasterosteidae 4
Salmo trutta (Brown Trout / Sea Trout) Salmonidae 4
Barbatula barbatula (Stone Loach) Nemacheilidae 3
Cottus bairdii Cottidae 2
Thymallus aeliani Salmonidae 2

🪰 EPT Species (Mayflies, Stoneflies & Caddisflies)

21 EPT species detected (12 families, 39 ESVs — E:7 / P:5 / T:9)
SpeciesFamilyESVs
Ephemeroptera (Mayflies)
Baetis rhodani (Large Dark Olive) Baetidae 3
Baetis scambus (Small Dark Olive) Baetidae 2
Baetis vernus (Medium Olive) Baetidae 2
Paraleptophlebia submarginata (Turkey Brown) Leptophlebiidae 2
Procloeon pennulatum (Large Spurwing) Baetidae 1
Serratella ignita (Blue Winged Olive) Ephemerellidae 1
Ephemera danica (The Mayfly) Ephemeridae 1
Plecoptera (Stoneflies)
Isoperla grammatica (Yellow Sally) Perlodidae 5
Nemurella pictetii (Pictet's Stonefly) Nemouridae 2
Leuctra digitata (Rolled-winged Stoneflies) Leuctridae 1
Leuctra fusca (Late Needle Fly) Leuctridae 1
Nemoura cinerea (Common Stonefly) Nemouridae 1
Trichoptera (Caddisflies)
Glyphotaelius pellucidus (Northern Caddisflies) Limnephilidae 6
Leptocerus tineiformis (Long-horned Caddisflies) Leptoceridae 2
Halesus digitatus (Northern Caddisflies) Limnephilidae 2
Halesus radiatus (Northern Caddisflies) Limnephilidae 2
Silo nigricornis (Humpless Case-maker Caddisflies) Goeridae 1
Hydroptila martini (Microcaddisflies) Hydroptilidae 1
Limnephilus marmoratus (Northern Caddisflies) Limnephilidae 1
Potamophylax latipennis (Northern Caddisflies) Limnephilidae 1
Rhyacophila dorsalis (Free-living Caddisflies) Rhyacophilidae 1

🔗 Your Ecological Twin

Most similar site: MM9 - Archer’s Green
River: Mimram (same river)
Similarity: 47% of species shared
Download Data

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

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