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Retrieving loggers from KZN

14 March 2022

Downloading data from Hobo loggers

Sometimes you have to take a leap of faith and leave expensive equipment in the field in order to get much needed long-term data. This is what we did last February in a trip to KZN where we made an elevational transect while collecting African clawed frogs for Laurie (see Blog Post here). We placed four loggers at sea level, 1000 m, 2000 m and 3000 m asl. Sadly, the logger at 3000 m asl disappeared very soon after we placed it in a deluge of floods that hit Lesotho in March 2021. That meant that there were still three more loggers out in the field that needed to be retrieved. 

Happily, the logger from 2000 m asl at the Fat Mulberry was retrieved by Marggie and she brought it to Stellenbosch where we could download the data.

This month I made a trip back to KZN to retrieve the outstanding loggers from near Dalton and at Bonamanzi:

The temperature of the water in a dam near Dalton never went below freezing, but it did get quite cold (as well as getting hot in the summer). 

Meanwhile at Bonamanzi, the temperature was nearly always above 10 C, and even went above 40 C!

You may remember that Bonamanzi was where we had our traps vandalised by crocodiles. Happily though, you can see that the logger (right) didn't come to the same fate. The logger near Dalton (left) was still tied to the same stone sunk in the dam. 

Thanks to friends in Lesotho, we redeployed one of these Hobo devices there. Because you can replace their batteries, they are fantastic and just carry on working. We are hoping that the new logger won't go AWOL!

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