Nature can adapt to even the most unpromising and uncompromising of physical environments, from deep oceans to arid deserts. And now we have a bee that lives in close proximity to an active volcano! The work is by one of my former PhD students, Dr Hilary Erenler (who is still a Visiting Researcher at the University of Northampton), and is featured in a big news story in the journal Science.
The full reference for the study, with a link to the journal, is:
Well done Hils, it’s a great study!
The second paper from the PhD thesis of my former student Dr Stella Watts has just been published in Annals of Botany – here’s a link to the journal’s website. It summarises the major findings from her field work on plant-pollinator interactions in the high Andes of Peru:
Watts, S., Dormann, C.F., Martín González, A.M. & Ollerton, J. (2016) The influence of floral traits on specialization and modularity of plant–pollinator networks in a biodiversity hotspot in the Peruvian Andes. Annals of Botany doi: 10.1093/aob/mcw114
This paper represents a major piece of research, including extensive field data collection over multiple sites in a challenging environment at altitude; state-of-the-art data analysis; and then summarising all of this into a single, digestible paper, with some great figures. I’m very proud to have been part of it!
Here’s the abstract; please email me or Stella if you’d like a copy of the full PDF:
Background and Aims: Modularity is a ubiquitous and important structural property of ecological networks which describes the relative strengths of sets of interacting species and gives insights into the dynamics of ecological communities. However, this has rarely been studied in species-rich, tropical plant–pollinator networks. Working in a biodiversity hotspot in the Peruvian Andes we assessed the structure of quantitative plant–pollinator networks in nine valleys, quantifying modularity among networks, defining the topological roles of species and the influence of floral traits on specialization.
Methods: A total of 90 transects were surveyed for plants and pollinators at different altitudes and across different life zones. Quantitative modularity (QuanBiMo) was used to detect modularity and six indices were used to quantify specialization.
Key Results: All networks were highly structured, moderately specialized and significantly modular regardless of size. The strongest hubs were Baccharis plants, Apis mellifera, Bombus funebris and Diptera spp., which were the most ubiquitous and abundant species with the longest phenologies. Species strength showed a strong association with the modular structure of plant–pollinator networks. Hubs and connectors were the most centralized participants in the networks and were ranked highest (high generalization) when quantifying specialization with most indices. However, complementary specialization d’ quantified hubs and connectors as moderately specialized. Specialization and topological roles of species were remarkably constant across some sites, but highly variable in others. Networks were dominated by ecologically and functionally generalist plant species with open access flowers which are closely related taxonomically with similar morphology and rewards. Plants associated with hummingbirds had the highest level of complementary specialization and exclusivity in modules (functional specialists) and the longest corollas.
Conclusions: We have demonstrated that the topology of networks in this tropical montane environment was non-random and highly organized. Our findings underline that specialization indices convey different concepts of specialization and hence quantify different aspects, and that measuring specialization requires careful consideration of what defines a specialist.
Keeping with the theme of Bees’ Needs Week, and the importance of pollinators to natural and agricultural ecosystems*, the Third International Conference on Pollinator Biology, Health and Policy takes place at Penn State University, USA, from the 18th to 20th July.
Here’s a link to the PDF of the programme with the abstracts, speakers’ details, etc. I won’t be attending** but I am involved as a collaborator*** in one of the talks being presented – Luísa Carvalheiro’s project on “Direct and indirect effects of soil eutrophication on pollination services“.
Best of luck to all the speakers and attendees, looks like it’s going to be a great conference.
*Wednesday’s grumpiness has almost disappeared, though it reached a new peak yesterday when we had a paper rejected by a journal after 10 months. There was one positive review, one middling review, and then a third in which the reviewer provided no comments – just “reject”! I was not happy about that and made my feelings known to the editor…..
**I’m actually in the Azores next week attending the Island Biology 2016 conference. More about that at the weekend.
***With about a gazillion other people! Luisa has pulled together an amazing data set.
Yesterday evening I learned that a large grant application that I’d submitted earlier this year had failed to secure funding. Statistically there was a high likelihood of this happening but that doesn’t make it feel any better: weeks and weeks of work have come to nothing.
So in a mood of bloody-minded contrariness and general displeasure at the unfairness of the world I thought I’d provide an alternative to the Bees’ Needs week I mentioned yesterday by focusing on food crops that look as though they should be insect pollinated (and their ancestors certainly were) but which don’t actually require pollinators.
The example pictured above is an F1 hybrid cucumber (Cucumis sativus) variety called “Mini Munch”, kindly grown from seed and given to me by my friend and colleague Dr Janet Jackson. Many cucumbers don’t need insect pollination, despite their large, colourful flowers, and the fact that related crops (melons, courgettes, squashes, etc.) generally do require pollinators. Indeed some varieties taste bitter if they are pollinated. I can recommend this web page on how to grow cucumbers for further advice.
As I was taking that photograph, and in another demonstration of how the world is against me at the moment, I spotted a bee feeding on one of the all-female flowers of this variety.
It spent some time there probing the centre with its tongue, so I think these flowers still produce nectar despite them not needing pollinators, a hang-over from their ancestry. Plants have a whole range of mechanisms that ensure reproduction without the agency of insects and other animal pollinators, and this has been exploited by crop breeders who have selected crop varieties for their ability to self pollinate or to reproduce asexually via apomixis (as in the case of this cucumber).
The same bee then flew onto a tomato (Solanum lycopersicum) flower (another group which varies in its demands for pollination) and I got a better look – seems to be a Leaf-cutter Bee of the genus Megachile.
The final example of a crop which requires little or no insect pollination are the chillies (Capsicum spp.) all of which are self-pollinating, I believe. This variety is a scrambling purple type called Orzoco*.
So, crops vary hugely in their need for pollinators and the presence of certain traits of animal pollination, such as large, brightly coloured flowers and nectar, is no guarantee that the crop really does have to be serviced by pollinators. The only way to be certain is to experimentally test the plants, a topic I hope to come back to later in the summer.
Don’t worry, this grumpiness won’t last long, in no time at all I’ll be back to banging on about the importance of pollinators. At least Monty, one of our two cats, still loves me.
*At least, that’s what it said on the seed packet; I’ve also seen it referred to as Orozco – does anyone know which name is correct?
In the current political turmoil around the Chilcot Enquiry, Brexit, leadership challenges and a change of Prime Minister you’d be forgiven for having missed the fact that 9th to 17th July 2016 has been designated “Bees’ Knees” week, as a follow on to the Pollinator Awareness Week of 2015.
Here’s the link to the Defra press release.
Unlike last year I’ve no specific plans to do any regular posts on the topic, but I will provide links to relevant items as and when I see them, starting with these two:
Why insects are declining globally, and why it matters.
Dave Goulson is trying to crowdfund a project to look at pesticides in plants from garden centres.
The latest volume of the international, peer-reviewed Journal of Pollination Ecology, of which I’m an editor, has just been published. All papers are free to download – here’s a link.
Unlike most open access journals there are no page charges for authors, so if you are a researcher involved in pollination ecology, please consider submitting a manuscript.
Friday 24th June 2016. What a surreal day. I spent it trying to understand why a small majority of the voting public had committed us to leaving the European Union, an organisation that has had a demonstrably positive impact upon our lives, our society, our economy, and our environment. That dream-like state was not helped by the fact that I’d stayed up most of the night with my youngest son James, watching the results roll in.
Saturday 25th June 2016. Twenty four hours later, after a good night’s sleep, I feel less dislocated but no less confused and disappointed. It is what it is, let’s get on with it.
It’s much too early to properly answer the question of what this all means for British biodiversity, of course. But as I pointed out in my post about the environmental arguments for remaining in the EU, there’s a whole raft of policies, legislation, agreements and initiatives that the government and NGOs need to consider. Just to give a couple of examples, what will happen to the All-Ireland Pollinator Plan, or the Special Protected Area status of places such as the Upper Nene Valley?
What I really hope is that we can continue as before, building on the current situation rather than tearing up the whole thing. To some extent I’m optimistic that we can for the near future, because the government will have (as it sees it) bigger things to worry about. But I do worry that eventually we will get left behind as EU environmental legislation evolves. That’s something we have to be mindful of in the coming years.
The ecological internet is already starting to discuss these issues; here are links to a few pieces that I’ve seen:
Adventuresinbeeland has discussed what leaving the EU means for British bees and beekeepers, pointing out that EU funding has enabled bee inspectors to carry out apiary inspections and work with beekeepers on issues such as bee pests and diseases.
The Wildlife Trusts are trying to look positively at the future, with Brian Eversham, Chief Executive for the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire, summing it up very well: “Many of those who disagreed over the Referendum agree strongly that wildlife, our countryside and the natural environment matter, now and for the future. We need their voices loud and clear in the coming months. As we are now responsible for our own, independent future, it is up to all of us to make sure that we keep the environment firmly on the national agenda.”
Mark Avery has also summed up the current situation very succinctly on his blog – one cartoon says an awful lot.
Finally, here’s Craig Bennett, CEO of Friends of the Earth, writing on how can we make Brexit work for the environment?
No doubt there will be more coming soon and I’ll try to provide updates on the blog.
In terms of my day job as an academic at the University of Northampton, things will also change across the whole British Higher Education sector, of course. On one level that’s a different set of issues to what I’ve been discussing, but there are also links: a great deal of ecological research activity is being funded by the European Union and involves cross-border collaborations. Scientists across Europe have to continue to make that work.
An early train to London yesterday got me to the RHS Chelsea Flower Show in time for the gates opening at 8am. I’d agreed to spend the day staffing the British Ecological Society’s Animal Attraction: The garden and beyond display, which deals with the relationships between plants and their pollinators – see my recent posts here and here.
The first thing I noticed as I approached the display was how impressive and well designed it looked, with some wonderful planting to complement the simple, bold scientific information. The second thing I noticed was that we had won a Silver Medal! The whole team was very pleased – it’s the third year that the BES has been represented at Chelsea, but the first time that it’s won a medal. I’m proud to have made a small contribution to that by advising on the plants and the scientific content, but the main kudos goes to the BES’s staff and to the garden designer Emily Darby.
Over the course of a long day we talked to hundreds of visitors about the display, what it represented, and the different ways that flowers are adapted to their pollinators. There was a huge amount of public interest and support, very gratifying to see. Here’s some pictures from the day:
Happy Biodiversity Day everyone! In celebration I thought I’d share with you my entry for this year’s University of Northampton Images of Research competition, the winners of which have just been announced (I wasn’t one of them, but congratulations to those who were).
Here’s the text I wrote to accompany the image:
Sometimes it’s difficult to photograph fast-moving bees, but this blurred image of a male Red-tailed Bumblebee (Bombus lapidarius) captures something of the essence of why plants use pollinators such as bees. Plants are static and cannot go searching for mates, so they sit and wait and use pollen vectors to move their male gametes to the flowers of other plants of the same species. Sometimes this involves wind or water currents; but for most plants this means using animal pollinators.
The bumblebee has been caught with its tongue extended, having just loaded up on nectar to fuel its search for virgin queen bumblebees with which to mate. The plant is a cultivated salvia variety growing in my garden: some of my research group’s work has involved studying pollinator diversity in urban and rural gardens, with a view to understanding the role of these artificial environments for conserving pollinators.
Pollinators, as regular readers of this blog will know, are diverse and important, both ecologically and agriculturally. But that diversity is declining and it’s an issue that deserves greater publicity and action.
To that end, for the past eight months I’ve been advising a team from the British Ecological Society (BES) on the content for a display at the RHS Chelsea Flower Show which is running all next week. The display is called “Animal Attraction: The Garden and Beyond” – if you follow that link you’ll get a sense of what the display is all about, but in essence there are three key messages that the BES is trying to get across:
As you can see from my wristband, I’ll be helping to staff the stand all day Tuesday 24th May, so if you’re at the show come and say hello and take a look at what the BES team has produced.
Prof. Jeff Ollerton - ecological scientist and author 