One of the many things that I love about Common Elder (Sambucus nigra), and which I didn’t have space to properly convey in my article about the species last year, is just how adaptable it is as a species. The tree possesses a lot of what biologists term “phenotypic plasticity“. This is the ability of an organism to flexibly change aspects of its morphology or behaviour or physiology in response to differences in the environment. Plants are especially good at this because, if they find themselves growing in less-than-optimal conditions, they can’t just uproot themselves and leave for pastures new. This is obvious to anyone who has seen a houseplant struggling in a dark corner of a room: the poor plant will etiolate and bend as its yellowing foliage tries to reach the light from a distant window. The same plant grown on a sunny windowsill will be more compact, greener, and healthier.
When it comes to Elder, and indeed other trees, winter is often the best time to see this plasticity, when the trunks and boughs are not cloaked in greenery. On a coastal walk at Klintebjerg yesterday, I spotted three rather different phenotypes of Common Elder which nicely illustrate this environmental context dependency.
The first was a wind-tortured tree growing at the base of a low hill, directly in the teeth of the prevailing Kattegat weather, its trunk bent away from the sea and its branches lopsidedly pruned:
The second was a more fortunate specimen, growing in the lee of that same hill and allowed to spread its symmetrical arms, as though waiting to embrace any passing birds. It had clearly never been pruned back by the landowner, who had allowed it to grow as a fine, single-trunked small tree:
As we walked back down the hill via a narrow path, enclosed and over-topped by a fairy tale canopy of dense, twisted Blackthorn (Prunus spinosa), I spotted another phenotype, different again. I initially thought that they were the stems of a woody climber, perhaps Old Man’s Beard (Clematis vitalba) or European Honeysuckle (Lonicera periclymenum). When I looked closer it was clear that these were Elder, growing narrow and long, using the Blackthorn as support, as they struggled to reach up through the canopy to gain the light:
There were several individuals like this, presumably the result of seed dispersal by birds perched within the Blackthorn. I don’t think that I’ve ever seen Elder growing in quite this way before, but then how often do we get to peer deeply into the secrets hidden within a dense Blackthorn patch?
I had only planned to write about Common Elder today, but I can’t resist mentioning that, over on his blog, ornithologist Mark Avery has written a very nice review of Birds & Flowers: An Intimate 50 Million Year Relationship. He describes my book as having:
…a lightness of touch and tone that should not be taken for lightness of understanding….This is a fine example of a book which is pitched to increase the public understanding of ecology and evolution, and succeeds.
Thank you Mark, that’s very gratifying to read, and I’m glad that you enjoyed it!
On that page you can sign up to Pelagic’s newsletter (which I STRONGLY recommend, because they produce some great natural history and science books, and not just mine!) and by doing so you can receive a 25% discount on all orders.
In this work, Nat has asked a group of us who are interested in this topic to assess the limitations of the current BNG system and how it might be improved to better support invertebrate populations. Please do read the study and comment either on the blog or directly on the pre-print. We’re interested in people’s views on this and whether we have missed anything important.
Here’s the abstract:
Meeting ambitions such as the Global Biodiversity Framework 2030 targets will require multiple conservation mechanisms that benefit the widest possible range of habitats and species. Using England as a case study, here we evaluate the likely impact of a novel and ambitious ecological compensation policy, Biodiversity Net Gain (BNG), on terrestrial insects, spiders, and other arthropods (‘invertebrates’), a functionally important but rapidly declining component of biodiversity. Current implementation of BNG in England sets out to provide a 10% uplift in biodiversity when infrastructure development (such as housebuilding) occurs. However, BNG is a habitat-driven approach, which risks overlooking important considerations relevant to invertebrate conservation, threatens to further reduce the size and quality of their habitats, and may increase habitat fragmentation. BNG – as currently implemented – therefore represents a missed opportunity to use a universally applied policy to benefit invertebrates and other functionally important components of biodiversity. We suggest ways forward to realign BNG with what we know to be crucial for successful invertebrate conservation, and with other policy mechanisms such as the National Pollinator Strategy. This will ensure that appropriate habitats and conditions for invertebrates are retained, enhanced, and created at a landscape scale, and that BNG is optimised to contribute to broader national conservation targets. As biodiversity accounting and offsetting schemes such as BNG are increasingly adopted around the world, the experience of BNG in England provides valuable insights into how ecological compensation programmes could be better designed, implemented, and monitored to ensure that benefits for a wide variety of taxa are achieved.
After what seems like a long wait, for me at least, today marks the official publication of Birds & Flowers: An Intimate 50 Million Year Relationship! I received my advance copies on Friday, an event that Karin commemorated with a short unboxing video:
It’s been a long journey from pitching the initial idea to Pelagic Publishing back in early 2021, through the various drafts that have culminated in the finished book. As you can see from the images on this post and the endorsements on the publisher’s web site, Birds & Flowers has so far been warmly received. I hope that future reviews are as positive!
A few people have asked me what’s next. In fact I have definite plans (as in topics, provisional titles, the start of chapter structure, and even some initial writing) for three more books. The next one is actually about half written, but then I have been working at it, on and off, for 30 years! Watch this space for more details…
In the shorter term, Karin and I are returning (permanently) to the UK at the start of March. We’ve enjoyed our time in Denmark, it’s been a fun two and a half years, but we’re missing our immediate family plus we both have some interesting work possibilities to pursue. In mid-April I will be going to China for three months to work with my colleague Zong-Xin Ren at the Kunming Institute of Botany. I’ll be sure to blog about my adventures there!
In the meantime, if you buy my book or borrow it from the library or from a friend, please let me know what you think in the comments section below.
In recent months, Karin and I have worked with the charity MONASIA and their Bee Camino project to develop a joint webinar. Here are the details, taken directly from MONASIA’s publicity:
In the intricate choreography of nature, the honey bee’s life mirrors the enchantment of a mystical well: ‘The more you draw from it, the more it fills with water.’ Karl Von Frisch’s profound words beautifully capture the essence of the honey bee’s existence. Honey bees are only one type of bee, however, and there are many other pollinators, whose tireless efforts sustain the delicate balance of ecosystems. Much like a well that replenishes when quenched, the pollinator’s purpose appears boundless, offering a timeless wellspring of inspiration for those attuned to the marvels of the natural world.
Inspired by the Bee Camino project, MONASIA brings you a transformative experience connecting nature and mindfulness.
Join us on this transformative journey named ‘Nurturing Mental Health in Nature’s Embrace,’ as we draw from the enchanting well of the bee’s life—a source of wisdom, sustainability, and a profound connection to the intricate rhythms of our planet.
Yesterday I received an email containing the following press release. I thought it might interest readers of the blog so I am copying it in full with no edits. I had a quick look over the report and it’s amazingly detailed and comprehensive. It’s a shame that the report only covers insects, but that probably reflects my current bias given that my next book, due out in February, is about pollinating birds! Press release follows:
Governor Polis and the Department of Natural Resources Release Pollinator Report
BROOMFIELD – Today, Governor Polis in partnership with The Colorado Department of Natural Resources (DNR), Colorado State University Extension, Xerces Society for Invertebrate Conservation, and University of Colorado Museum of Natural History released the Colorado Native Pollinating Insects Health Study which is the most robust and detailed account of pollinator health ever undertaken in Colorado history. As directed by SB22-199, Native Pollinating Insects Protection Study, sponsored by Senators Sonya Jaquez Lewis and Kevin Priola, and Representatives Cathy Kipp and Meg Froelich, signed by Governor Polis on May 27, 2022, the study assesses the health of Colorado’s native pollinators, evaluates state policies for safeguarding pollinators, and makes recommendations on how to preserve and protect pollinators in Colorado.
“Pollinators play a critical role in Colorado life. From Crested Butte’s beautiful spring meadows to Palisade Peaches and Rocky Ford melons, Colorado’s pollinators sustain our flora and enable many foundational industries in every corner of the state. As our climate changes, we must safeguard the pollinators that generate and regenerate the Colorful Colorado we love,” said Governor Polis
Colorado is home to various native insects and bats whose pollinating services are at the heart of healthy environments and economies. Pollinators are critical to Colorado’s economy and our agricultural production and food systems, and they are essential for flowering plants that support the state’s wildlife ecosystem and add color to Colorado’s beautiful landscapes.
“Colorado is fortunate to have a tremendous diversity of plants and animals, but pollinating insects are perhaps the least studied but most beneficial for our ecosystems, economy and quality of life,” said Dan Gibbs, Executive Director, Colorado Department of Natural Resources. “I greatly appreciate the time and effort of the study authors who truly did a deep dive into the current state of pollinating insects and state policies and structures. I look forward to working with Colorado legislators and stakeholders in pursuing the best policies to ensure pollinating insect protection and long-term health.”
Colorado is home to over 1,000 species of bees—nearly 30% of North America’s and approximately 5% of the world’s bee species—and nearly 300 species of butterflies, representing over 40% of the diversity of butterflies in North America north of Mexico, some of which are already listed under the federal Endangered Species Act. This report underscores the importance of the Polis administration’s goals to tackle Colorado’s greenhouse gas emissions, prepare industries for the impending effects of climate change, and create more sustainable living in Colorado for pollinator populations.
“Our ecosystems rely on pollinators, which is why I’ve championed measures that limit toxic chemicals from harming pollinators and put forth a statewide assessment to better understand the problems our pollinators face and identify practices to better sustain them,” said Senator Sonya Jaquez Lewis, D-Longmont. “Today’s report shows that there’s plenty to do moving forward, and I am looking forward to continuing our work to protect pollinators and the ecosystems that are dependent on them.”
“I’m excited that we have this report to help us understand the extent of pollinator decline in Colorado. While Colorado ranks fifth nationally for the rate of honey-bee die-offs, we haven’t known as much about native pollinating insects. This threatens our food production, biodiversity and health of our ecosystems,” said Rep. Cathy Kipp, D-Fort Collins. “We created the Native Pollinating Insects Protection Study in 2022 to identify ways to better protect and support the native Colorado pollinators, like different bee species, butterflies, and moths, that are also essential to maintaining a healthy environment. These findings will help direct future legislation to create a safer environment for our pollinators, protect our food supply and support biodiversity.”
Promoting policies that benefit native pollinating insects represents an opportunity to foster healthy and sustainable pollinator populations, especially in agricultural and urban habitats. This includes enhancing pollinator-friendly native plantings along I-76 following its designation as a Colorado Pollinator Highway by the Colorado Department of Transportation and other existing state plans such as the state’s Natural Areas Program, and Wildlife Action Plan among others.
“Working on the Pollinator Health Study has been an amazing opportunity to collaborate with so many locally, nationally, and internationally recognized experts in the field of pollinator conservation. In addition to the immense amount of information within the report, this study highlights the importance of collaboration between scientists and land management agencies to bring together the many facets needed for conserving native pollinating insects,” said Deryn Davidson, Sustainable Landscape State Specialist, Colorado State University Extension. “Having the existing research on Colorado pollinators paired with recommended land management practices in one, comprehensive document is an incredible tool for policy makers, land managers, and really anyone interested in actionable steps for pollinator conservation.”
Areas of immediate action and priorities highlighted by the Pollinator Report include:
Priority 2: Protect, restore, and connect pollinator habitats.
Priority 3: Mitigate environmental changes that negatively impact pollinators and their habitats.
Priority 4: Reduce the risks from pesticides to pollinating insects.
Priority 5: Monitor and support native and managed pollinator health.
Governor Polis announced his annual budget proposal on November 1, focusing on ensuring Colorado is more affordable, sustainable, and liveable. The Governor included $100,000 to support education and incentives to encourage the use of pesticide alternatives in agricultural production and residential or commercial landscaping. On May 17, 2023, Governor Polis signed Neonic Pesticides as Limited-Use Pesticides, sponsored by Senators Kevin Priola and Sonya Jaquez Lewis and Representatives Kyle Brown and Cathy Kipp, which protects pollinators from harmful toxins.
The world of nature conservation is fast moving and complex. New opportunities for wildlife and threats to biodiversity seem to arrive almost daily, there are regular high-level meetings focused on conventions and policies, and an endless stream of scientific research being published in the world’s journals. Keeping up with all of this is impossible; trying to keep up with it is exhausting.
For this reason I’ve recently subscribed to Mike Shanahan’s newsletter The Nature Beat on Substack. Mike’s a writer with a background in science research. His PhD was on fig ecology and he wrote an excellent book about the ecological and cultural importance of these fascinating trees called Ladders to Heaven which was one of my five book choices on the Shepherd site.
The Nature Beat is described by Mike as being:
primarily aimed at journalists covering topics such as biodiversity, conservation, wildlife trade, ecological restoration and so on. Of course, non-journalists may also find it useful.
As a non-journalist trying to keep abreast of what’s happening in this complex and rapidly evolving arena, I find it extremely useful! For the past couple of months I’ve opted for the free subscription, but from today I’m going to pay. The kind of insights and expertise that Mike brings to his newsletter are invaluable for anyone interested in how our world is changing, for the worse and for the better. Please subscribe and if you find the content useful, and can afford it, consider upgrading to the paid version.
In the run up to release of my new book Birds & Flowers: An Intimate 50 Million Year Relationship, my publisher, Pelagic, has updated the book description and provided a preview of some of the pages and colour plates – follow this link to view them. On that page you can also pre-order the book direct from Pelagic Publishing, who will ship worldwide, or it’s available from many of the online book sellers.
I’m really excited to be sharing this with the readers of my blog and can’t wait for publication day! Early in 2024 I hope to do some talks, online and in person, to promote the book – so watch this space.
With best wishes to you all and hopes for a peaceful, and more sustainable, New Year.
Obviously the title of this post is click-bait, as there’s LOTS of things that I wish more people knew about pollination! But here’s one that really gets my (Yule) goat.
I’ve lost track of the number of times that I’ve read statements in books and research papers such as “bees collect lots of pollen from flowers therefore they are good pollinators”. Even worse, I sometimes see studies where pollen has been removed from “pollen baskets” or other scopae, then used as a measure of the importance of those bees as pollinators.
In both cases it seems to have been forgotten that bees are collecting pollen to feed their larvae and pollen that ends up in scopae is generally not available for pollination.
That’s the purpose of the Venn diagram at the top of this short post, to remind us that there can be a disconnect between what bees are doing and what plants require: foraging for pollen only partly correlates with flower pollination. Indeed, the same argument applies to any animal that feeds itself or its young on pollen, including pollen wasps (Maserinae), Heliconia butterflies, and some flower-visiting hoverflies, birds and bats.
It’s not only loss of pollen from reproduction that’s important here: depending on the size and behaviour of the bees relative to the shape and size of the flower, they may go nowhere near the stigma, so even if they are carrying viable pollen, it can be lost as far as the plant is concerned.
Note also that many bee species will collect pollen from wind-pollinated plants such as grasses, oaks, etc. Indeed in some species the availability of such pollen is extremely important – see Manu Saunders’ review on this topic and more recent papers that cite it. Again, it emphasises the partial disconnect between pollen collecting by bees and pollination of flowers by bees.
Assessing which flower visitors are actually pollinators is not technically demanding but it can be time consuming. The minimum that you need is single visit deposition (SVD) experiments in which you expose unvisited flowers to one visit by the potential pollinator. Then you assess how much pollen has landed on the stigma or (better) whether the visit results in seed set.
If you want to know more about the evidence that’s required to determine if a flower visitor is or is not a pollinator, they are codified in the “Cox-Knox Postulates” that I discuss in my book Pollinators & Pollination: Nature and Society.
Books are never perfect. In the run-up to publication of Birds & Flowers: An Intimate 50 Million Year Relationship, I am all too aware that this is a truth that’s a cause of anxiety, and sometimes sleeplessness, for all authors. One category of imperfection is tipographical* errors have been introduced at some point in the process of writing and editing. In the past these were corrected in the first edition of a book by the inclusion of errata slips, and such errors are sometimes important in determining the true first editions of older books. On page 20 of the first edition of Darwin’s Origin of Species, for example, there is a misspelling of the word “species”**. This was corrected in the second edition but is an important marker of an extremely valuable book, intellectually and (now) commercially.
A second category involves errors of fact or interpretation or expression that, with hindsight and reader feedback, require correction, or at least acknowledgement, by the author. These are the ones that really make an author squirm inside, even though we know that they are inevitable: we are, after all only human.
It turns out that there are a few examples of both categories in the first edition of my 2021 book Pollinators & Pollination: Nature and Society. Some of them have been corrected in the second edition, but if you purchased the first edition then these are what you should look out for:
P22 – ‘Unmated queens and males (drones) are produced by the colony later in the season’ changes to: ‘Unmated queens and males (drones) are produced by the colony from spring onwards.’
P30, Fig 2.9 – Correct ‘Tabaernemontana’ to Tabernaemontana
P51, Figure 3.8 – title – it should read C. rhynchantha [there’s an h missing]
P57 – ‘The bank that Darwin was referring to is on his property at Down House in Kent, and it was one he observed many times during his walks through the garden.’ changes to ‘The bank that Darwin was referring to is near his property at Down House in Kent, and it was one he observed many times during his walks in the area.’***
P146 – ‘I’ve even see them attack and kill honey bees’ should read: ‘I’ve even seen them….’
P169 – in the title for Figure 10.5, Anon (2019) should be Anon (1919) [in some presentation copies of my book I have corrected this and initialed the change]
P259 – this reference: Klein, A.-M., Steffan-Dewenter, I. and Tscharntke, T. (2003) Fruit set of highland coffee increases with the diversity of pollinating bees. Proceedings of the Royal Society B 270: 955–961. doi: 10.1098/rspb.2002.2306.
Should be replaced by:
Klein, A.-M., Steffan-Dewenter, I. and Tscharntke, T. (2003) Bee pollination and fruit set of Coffea arabica and C. canephora (Rubiaceae). American Journal of Botany 90, 153– 157. doi: 10.1046/j.1365-2664.2003.00847.x
The last two have yet to be corrected and will need to wait for the third edition:
P119 – the Rader et al. study did not include birds and bats, just insects.
P262 – “Nabhan, G.P. and Buchmann, S.” should read “Buchmann, S. and Nabhan, G.P.”
That final error is really embarrassing because, as I point out in the chapter ‘The Politics of Pollination’, their book The Forgotten Pollinators was an inspirational one for stimulating research and action around pollinator conservation! I can offer no explanation for why the order of the authors got reversed in my head.
My sincere thanks to those readers who pointed out some of these errors. My hope is that Birds & Flowers has fewer, but I may be fooling myself…
*You see what I did there?
**Proof-reading is boring and soul-destroying for any author, but really Mr Darwin?!
***If there is an after-life, I’d like to think that Darwin’s now enjoying this error after my snarky comment in the second footnote. To which I’ll respond: watch out for a doozy of a footnote about a Darwin footnote in Birds & Flowers!
Prof. Jeff Ollerton - ecological scientist and author 