Araba Bioscan

Araba Bioscan SLAM comparison 15-19 November 2020

Data for the period 15-19 November 2020

See the Araba Bioscan Project page for background information on the project and methods.


SLAM trap
SLAM trap positioned for comparison with Malaise trap in the period 15-19 November 2020

There has been a noticeable imbalance in the insects collected in the Araba Bioscan Malaise trap to date. The vast majority of larger insects have been moths, with rather few flies or wasps. This week, I chose to add a second trap (a SLAM trap which operates like a small Malaise trap with four access quadrants instead of two sides) positioned around 10 m away in slightly more exposed spot. This page provides an overview of the material caught in this trap. The balance was very different with many more beetles, including three Euomma lateralis Boheman, 1858 (Tenebrionidae: Alleculinae) and one Pterohelaeus striatopunctatus Boisduval 1835 (Tenebrionidae: Tenebrioninae), and cockroaches, including one Robshelfordia circumducta (Walker, 1869) and seven Johnrehnia concisa (Walker, 1871) (both Ectobiidae: Blatellinae), and a larger number of insects overall. This was despite this trap only being deployed for less than five complete days.

This has encouraged me to set up a second Malaise trap in the position used for the SLAM trap and to compare this in the coming week with the original trap. Assuming a greater diversity of insects also occurs in the new Malaise trap, I will decommission the first one and effectively restart the clock on the project.

The collecting medium was 95% isopropyl alcohol.

Sample images

Sample for 15-19 November 2020
ArabaBioscan 2020-11-19 SLAM

Environmental measurements

Sunrise and sunset sourced from Sunrise-Sunset and relate to the listed date. All other measurements are calculated for the 24-hour period to 09:00.

Date16 Nov17 Nov18 Nov19 Nov
Mean temperature (°C)22.618.317.919.6
Max temperature (°C)30.928.427.630.1
Min temperature (°C)17.29.912.612.9
Mean humidity (%)51.558.456.562.1
Max humidity (%)
Min humidity (%)
Mean soil moisture (%)28.925.123.923.0
Max soil moisture (%)
Min soil moisture (%)
Mean relative pressure (hPa)1016.11016.11022.41022.9
Max relative pressure (hPa)1018.21020.71025.61025.6
Min relative pressure (hPa)1012.41012.81019.01020.9
Mean absolute pressure (hPa)938.7938.7945.0945.5
Max absolute pressure (hPa)940.8943.3948.2948.2
Min absolute pressure (hPa)935.0935.4941.6943.5
Daily rainfall (mm)
Sunshine hours9.
Max solar radiation (W/m2)971.4818.4939.5933.4
Max UV index9799
Mean wind speed (km/h)
Mean wind direction318.4321.5322.9315.5
Max gust (km/h)16.634.923.89.4

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