I've learned the hard way that there is an enormous difference between microSD cards in the amount of power they need. When it comes to putting audio recorders out in nature, that matters a lot.

As an example, I was just comparing my latest AudioMoth results with SanDisk Extreme 64GB cards compared with Samsung Pro Plus 128 GB cards last year.

In the same device, with the same dawn-dusk daytime recording settings, on the same three fully-charged Powerex rechargeable batteries, the Samsung card recorded for four days (11 GB) before flattening the batteries, while the SanDisk cards recorded for 12 days (44 GB) before the flattening the batteries.

Given that it takes a lot of time for me to get to these remote sites to deploy these recorders, this makes a big difference to how much data I get.

#AudioMoth #AudioRecorder #birds #BirdMonitoring #EcologicalMonitoring #SDcards #EcologyMethods

⬇ -50 % od roku 1980. Počty vrabce domácího (Passer domesticus) se v Evropské unii snižovaly zejména v 90. letech 20. století.

I když je trend početnosti vrabce domácího po roce 2000 stabilní, vévodí žebříčku běžných druhů, u nichž v Evropské unii mezi lety 1980 a 2017 ubylo nejvíce jedinců (Gregory a kol. 2023).

Více o nové verzi indikátorů na https://www.birdlife.cz/od-80-let-z-evropy-zmizelo-61-polnich-ptaku/

Foto: Václava Štofflová; stofflova.cz

#birdlifecz #ptaci #pecbms #birdmonitoring #vrabec #sparrow

My #BirdTrack year summary - not entirely comprehensive because I also submit some casual records via @iRecordWildlife, but I really like these infographics by the @_BTO @BirdTrack Most of this is work I carried out with @hawkeye_tom #wildliferecording #BiodiversityGatwick #birdmonitoring