Diario de balders

Summary:
The number of species and passes detected is significantly lower in 2024 compared to previous years; some species have been completely absent.

Summary of emergence surveys (sunset - 30 minutes to sunset + 180 minutes) carried out at a fixed location survey point using Echo Meter Touch and manually analysing all calls:

Dates recorded:
Barbastelle Bat 16/04 - 12/05
Brandt’s Bat 17/04 - 22/04
Brown Long-eared Bat 04/02 - 10/06
Common Pipistrelle 04/01 - 16/06
Daubenton's Bat 16/04 - 11/05
Greater Horseshoe Bat 14/05 - 15/05
Grey Long-eared Bat 26/03 - 31/05
Leisler’s Bat 20/03 - 06/05
Lesser Horseshoe Bat 04/01 - 15/05
Myotis sp. 16/03 - 15/05
Nathusius's Pipistrelle 16/04 - 27/05
Natterer's Bat 09/02 - 22/04
Noctule Bat 09/02 - 15/06
Serotine 15/03 - 10/06
Soprano Pipistrelle 04/01 - 16/06
Whiskered Bat 01/04 - 01/04

Total number of recordings:
Soprano Pipistrelle 5833
Noctule Bat 1984
Common Pipistrelle 438
Serotine Bat 127
Lesser Horseshoe Bat 102
Brown Long-eared Bat 24
Natterer's Bat 20
Nathusius's Pipistrelle 15
"Myotis species" 13
Leisler’s Bat 8
Daubenton's Bat 7
Grey Long-eared Bat 4
Brandt’s Bat 3
Greater Horseshoe Bat 3
Barbastelle Bat 2
Whiskered Bat 1
Total of 8585 passes in 75 surveys with the last survey on 16/06/24

Notes on each species:

Barbastelle Bat:
Very rarely recorded.

Brown Long-eared Bat:
Recorded between mid February and mid October in low numbers.

Common Pipistrelle:
7% of the Pipistrelles in my roost are this species; active all year with a peak in October.

Daubenton's Bat:
Hunt over water courses; occasionally recorded between mid February to mid November.

Greater Horseshoe Bat:
Very occasionally recorded each year between mid March and late September.

Grey Long-eared Bat:
Recorded mid February to early October in very low numbers.

Leisler’s Bat:
Recorded from mid February to mid October.

Lesser Horseshoe Bat:
Recorded between late August and mid April.

Nathusius's Pipistrelle:
Migratory species recorded between early March and late July although in milder years this can be up to early December.

Natterer's Bat:
Recorded year round; most active between late January and mid April.

Noctule Bat:
Active late March to mid September. Very high numbers recorded between late March and late May.

Serotine:
Active between mid March and mid August; peak numbers always seen in early July to mid August.

Soprano Pipistrelle:
Maturnity roost site; active year round and when pups are being reared can be seen during the day between May and July.

Whiskered Bat:
The most common Myotis species locally; recorded late March to late October.