Bat monitoring in Hartland - 2024

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.

הועלה ב-מאי 4, 2024 08:59 לפנה"צ על ידי balders balders

תצפיות

תמונות/קולות

מתצפת.ת

balders

תאריך

פברואר 18, 2024 05:50 אחה"צ GMT

תיאור

Hockey stick shaped call; peak frequency 56.9 kHz. Emerged from roost at 17:50

תמונות/קולות

מה

עטלפון אירופי (Pipistrellus pipistrellus)

מתצפת.ת

balders

תאריך

פברואר 24, 2024 06:42 אחה"צ GMT

תיאור

Emerged 53 minutes after sunset. Hockey stick shaped call with peak frequency of 43.9 kHz

תמונות/קולות

מה

רמשן זוטר (Nyctalus leisleri)

מתצפת.ת

balders

תאריך

מרץ 20, 2024 06:35 אחה"צ GMT

תיאור

Chip-chop call with chop starting above 25 kHz

תמונות/קולות

מה

אוזנן (Plecotus auritus)

מתצפת.ת

balders

תאריך

מרץ 24, 2024 07:47 אחה"צ GMT

תיאור

Steep two part call; starting at 74 kHz, ending at 12.8 kHz with a peak frequency of 27 kHz. ID'd manually but verified by BTP Pipeline with 96% confidence

תמונות/קולות

מה

רמשן לילי (Nyctalus noctula)

מתצפת.ת

balders

תאריך

מרץ 26, 2024 07:46 אחה"צ GMT

תיאור

Chip-chop call below 25 kHz

תמונות/קולות

מה

אזנן (Plecotus austriacus)

מתצפת.ת

balders

תאריך

מרץ 26, 2024 08:07 אחה"צ GMT

תיאור

Manually ID'd as GLEB due to steep calls with starting frequency all below 48 kHz and peak frequency of 24 kHz. Echometer & BTO pipleline ID as Grey Long-eared Bat as well

תמונות/קולות

מה

פרסף גמדי (Rhinolophus hipposideros)

מתצפת.ת

balders

תאריך

מרץ 2024

מקום

England, GB (Google, OSM)

תיאור

Lesser Horseshoe around 110 kHz with Common Pipistrelle (steep calls between 45 & 75 kHz)

תמונות/קולות

מה

נשפון משופם (Myotis mystacinus)

מתצפת.ת

balders

תאריך

אפריל 1, 2024 08:40 אחה"צ BST

תמונות/קולות

מה

נשפון דק אוזן (Myotis nattereri)

מתצפת.ת

balders

תאריך

אפריל 8, 2024 10:45 אחה"צ BST

תיאור

Steep straight call with starting frequency of 126 kHz

תמונות/קולות

מתצפת.ת

balders

תאריך

אפריל 2024

מקום

England, GB (Google, OSM)

תיאור

1st recording of 2024; normally Barbastelle's are recorded year round here - a very late emergence from hibernation.

Classic straight line call starting at 36 kHz & ending at 29 kHz. peak frequency 33.8 kHz

תמונות/קולות

מה

פרסף גדול (Rhinolophus ferrumequinum)

מתצפת.ת

balders

תאריך

מאי 14, 2024 11:58 אחה"צ BST

תיאור

1st recording of 2024; inverted horseshoe shaped call at 83 kHz.
Observed during manual review; not detected by autoid or review on BTO Pipeline

תמונות/קולות

מתצפת.ת

balders

תאריך

מאי 27, 2024 01:14 לפנה"צ BST

תיאור

Autoid'd as Kuhl's Pipistrelle by Echometer & BTO; think this is more likely to be Serotine