Iridescent Bugs

I’m currently in Australia(!) and will be here for the next 4 months on an Endeavour Fellowship, working on the ecological and genetic basis of colour variation in Hibiscus Harlequin Bugs (Tectocoris diophthalmus). I’m based at Macquarie University in Sydney, working with Mariella Herberstein and Kate Umbers.


Hibiscus Harlequin Bugs have contrasting pattern made up of orange colouration and iridescent blue patches that vary considerably in size between individuals and populations. Northern populations have far less blue colouration, and may even be completely orange. Furthermore this variation has been shown to influence survival against different types of predators. My work will focus on the causes of this variation, both within and between populations.

ESEB 2017

I’ve finally recovered from conference flu so just a quick post about ESEB 2017.

The conference was awesome, and very well organised given the size. The main program was on an app that my old phone sadly cannot handle, but they also gave out smaller program booklets so I was able to organise my time well enough.

As usual for ESEB the standard of the talks was pretty high. My lack of access to the abstracts did mean I ended up in a fair few theoretical talks, but honestly one of the reasons I prefer large conferences is getting outside my narrow sphere of study for a while. I found the whole experience very useful for helping me generate new ideas, not to mention finding new collaborators! I also quite enjoy the challenge to trying to follow talks on subjects or techniques I am not familiar with. As someone who got into academia, at least partly, because they just enjoyed learning new things, conference season is the highlight of my year.

The conference dinner was also very fun. Rather than the usual drill of sitting in a large room, on a table of people you don’t know, eating dry roast ham, we instead had a “food fair” in a nearby park with vans serving pizza, chips, ice cream, wraps and various other foods.

Oh and finally. I won 3rd prize for my poster!

ESEB 2017 poster V2

Return to Konnevesi

Winter is finally over in Finland (although you wouldn’t always guess it from the weather) so the bird population in Konnevesi can once again relax and get on with the important things, like having babies.

Last year I posted a rather morose description of our struggles to catch enough birds following two bad breeding seasons. I’m happy to report that we did in fact get a decent season in 2016, in fact midsummer was actually sunny! As a result catching was much easier this winter.

Exhibit A – a slightly blurry Willow tit 

But the joy is somewhat short-lived as this May has been one of the coldest on record. I won’t actually be working with the birds this coming winter (I’m off to warmer climes) but I hope this cold weather hasn’t hit them too hard…

Fun with Spiders

This September I was lucky enough to go to Hamburg for a couple of weeks to run some predation experiments with spiders. The experiments were part of a collaboration with Prof. Susanne Dobler and Prof. Jutta Schneider to test the effects of the wood tiger moth’s defence fluids on model spider predators (in this case Nephila senegalensis and Larinioides sclopetarius). Stay tuned for the results!



Summer fieldwork round-up

Since I didn’t have the time to post any fieldwork news this summer I will instead pack it all into a single post. Efficiency!

As always summer is moth collection time, and this year I was in two countries: Estonia and Scotland.

Estonia was first. We went as a team of four, planning to stay a week and catch around 30 moths. In the end, thanks to some very warm weather, we got that number in the first 3 days and were able to return early.

I went to Scotland on my own as most of the lab were off catching in Georgia (the country, not the state). I had a bit of a worrying start, catching a grand total of one moth in the first two days. Scotland is always a bit tricky, unlike in Finland and Estonia, where the moths can generally be found on the edge of woods, in Scotland we generally find them on coastal meadows. This makes for some very scenic fieldwork, but also greatly increases the amount of climbing involved, and the risk of running off the edge of a cliff while chasing them. In the end, despite some less-than-ideal weather, I manged to get 15 moths to inject some much-needed genetic diversity into our lab population.

So once again I missed out on the beauty and excitement of Georgia (where the moths live at the top of mountains!) Still I was able to stock up on Scotch whisky in duty free, and there is always next year…

Climate change strikes again

Last week I finished my work with wild birds for another winter. As part of our research, myself and my colleagues catch wild Blue and Great tits and use them as predators to test various aspects of our moth’s defensive strategies. As I’ve discussed before this is a challenging task (tiny birds do not make for the most cooperative collaborators), but this year we had bigger problems: climate change.

I frequently hear from Finns in my department that winters in Finland used to be colder and more snowy. It’s true that during both winters I have spent here we haven’t seen much snowfall until after Christmas (although there was a brief period this year when it seemed the snow was here to stay, before temperatures soared to +10 Celsius and it all melted). In fact this Christmas was one of the warmest on record. While I am always a little sceptical of people complaining that this years winter/summer is “the worst ever” (for example I strongly believe that summers in England have always been predominantly cold and wet, despite what some of my elders may claim), there is no denying that Finland is in no way exempt from increasing global temperatures. Its beautiful white winters are going to get shorter, the months of dreary grey sludge longer.

This is of course bad news for lovers of winter sports (dog sledging in particular seems to be suffering, hard to train your dogs when there’s only a couple of months a year, or less, they can work), but why is it bad for our birds? Well for two reasons, first the lack of snow cover is bad news for anything that overwinters in the soil (like our moth larvae). These creatures normally rely on a thick layer of snow to insulate them from the worst of the cold, as well as sudden changes in temperature. Less snow means fewer moths, and other insects, come the summer. A more immediate problem for us is catching. We work with the birds in the winter, not only because they are  not breeding then, but also because we lure them into our traps using food. Peanuts, to be specific. When food is abundant they have no reason to come; we have to wait until the snow cover makes foraging difficult to attract them in any great numbers. The later the snow comes, the less time we have for our experiments, and as soon as the temperature starts to rise in spring they go into breeding mode. Have you ever tried to run an experiment with a bird that keeps trying to court its own reflection? It’s not ideal. Sudden temperature changes are also not good. This year the temperature dropped from above zero to -30 in a matter of weeks. Winter is already a difficult time for small birds, but extreme changes like that stretch them to breaking point. In the weeks after the drop we saw almost no birds at any of our feeding stations. Were they dead? Had the just moved elsewhere? Were they hiding somewhere? We don’t know, but one thing was for sure, they weren’t where we needed them.

A Blue tit emerges victorious from a trap with a peanut

It’s not just the winters that are causing trouble. You would think that warmer winters would also mean warmer summers, but the truth is the past two summers in Finland have also been disappointing. Crucially, while we have had warm periods both years, we’ve had two very cold midsummers. My first midsummer here in 2014 it snowed! This means that insect availability drops sharply at the very time the birds are trying to feed their chicks. Unsurprisingly, chick survival is lowered and fewer new birds join the population.

Hats and coats at midsummer 2014

All this means we have fewer birds and less time to catch them. To combat this we have to catch birds from further afield, sometimes using mist-nets rather than traps. It also (frustratingly) means we simply cannot do as many experiments. We are already planning ahead for next winter. What we really need now is a good breeding season, but even that will not be enough to bring the population back to what it was just two years ago. Much of the forest surrounding our field station has been cut down to make way for new housing. Many of our nest boxes were cleared along with it. We are now working to replace those (partly by selling nest boxes cheaply to local residents) and set up new feeding sites. With some luck we can maintain a decent population of both Great and Blue tits in the area for years to come. I hope so. When I first moved to Finland it seemed like an untamed wilderness, but I now see just how heavily humans have impacted it’s wildlife, and how quickly said wildlife is disappearing. For example, in January 2014 I came to the field station for a visit before starting my postdoc. I remember the head technician complaining about the Willow tits always stealing peanuts from the traps as they “knew we didn’t want to catch them”. In my past two winters I have seen exactly one Willow tit at the traps. I hope it comes back. It can have all the peanuts it wants.