Tag Archives: invertebrate sampling

Field work news – Chapter 2

Biodiversity assessments at full blast

My last post belongs to the past by now – anyway, that means that I moved to my outdoor workplace. We are mapping sand lizard populations and sampling pollinators, moths (and recording bats at the same time) and still ground-dwelling arthropods. We also running an experiments to measure seed predation along urban gradients. Hopefully we are able to start another experiment on pollinator visitation rates soon – so long as the weather is co-operating.

Field work news – Chapter 1

Plants, plant traits and ground-dwelling arthropods

Unfortunately, spring was very cold and rainy but however, we ‘bravely’ started our field work for the BIBS project some weeks ago. Currently, our team is doing the plant diversity assessments and also pitfall traps are exposed. Moreover, we are measuring plant traits to analyse intraspecific trait variations along the urbanisation gradient – we are going to run these analyses for invertebrate taxa and hopefully sand lizard populations as well – wait and see. In addition, some students are observing phenology of plant species at 30 sites – very labour-intensive. Today I emptied our pitfall traps for the first time and I can’t wait to study our samples in the lab.

Working in the invertebrate lab

Insects and spiders of Galápagos

Together with my colleagues from the invertebrate lab of the Charles Darwin Research Station I recently finished the identifications of the spider, beetle and bug samples from the Los Gemelos project. We found a number of very interesting endemic species such as the spiders Darwinneon crypticus, Galaporella thaleri or Olios galapagoensis as well as endemic beetles such as Anchonus galapagoensis, Ataenius aequatorialis or Mordellistena galapagoensis. It was a great experience for me to see all this new species – and of course to work with the awesome team. Many thanks! Back in Berlin again, I am going to run the statistical analyses – look out for coming publications. If you are already interested in some basic results from the Los Gemelos project please make a note of the following paper which will published in the Galápagos Report soon:

Restoration of the blackberry-invaded Scalesia forest: impacts on the vegetation, invertebrates and birds (by Jäger H, Cimadom A, Buchholz S, Tebbich S, Rodriguez J, Barrera D, Breuer M, Walentowitz A, Carrión A, Sevilla C & Causton C)

Galápagos field trip

Visiting the study sites at Los Gemelos

I had a very amazing field trip to the Scalesia forests at Los Gemelos. Scalesia species have been called “the Darwin’s finches of the plant world” because they show a similarly dramatic pattern of adaptive radiation. These giant daisy trees have an entire vegetation zone named after them. Scalesia is a genus of the family Asteraceae that is endemic to the Galapagos Islands. They consist of 15 native shrubs and tree species with six subspecies and each of the species has adapted to the different vegetation zones across the different islands.

A zone in the highlands of some islands is referred to as the Scalesia Zone which is a lush cloud forest and home to the largest of the Scalesia species (S. pedunculata dominant on Santa Cruz). From a distance the vegetation looks like a hummocky bog land but under the canopy, mosses, bromeliads, epiphytes and orchids thrive. The whole Scalesia zone is most threatened by human settlement. The zone is some of the most fertile land area on the Islands and perfect for agriculture. This has led to much of the original Scalesia forest being chopped down and replaced. Furthermore, the spread of introduced species such as blackberry has adverse effects on the habitat.

Here is a very interesting article about Scalesia forests which was published in GALAPAGOS REPORT 2009 -2010.