Category Archives: Butterflies

Hunting the Chequered Skipper: an encounter with England’s latest species reintroduction project

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If you have been following recent conservation news on social media you’ll know that this week was an important one for invertebrates.  The Chequered Skipper, a butterfly last seen in England in 1976, has been reintroduced to the country as part of the Back From the Brink initiative.  The Chequered Skipper project is led by Butterfly Conservation and a team travelled to a site in Belgium earlier in the week where about 40 skippers were captured.  These insects were transported back to the UK where they were held overnight in mesh cages at a secret location in order to acclimatise them, then released into the wild.  The release was filmed as part of next week’s BBC Springwatch series – look out for it.

The exact location of the reintroduction is secret.  However I can tell you that it’s occurred in the Rockingham Forest area of north Northamptonshire, in habitat that (over the past couple of years) has been managed specifically for this reintroduction, in order to create a network of sites across which the species could disperse in the future.  This area was the last stronghold of the species in England prior to its extirpation.  No one knows why it went extinct here, but hung on and did well in Scotland, but it may relate to climate: 1976, as many of the middle-aged will remember, was a very hot, dry summer, and this butterfly likes it warm and humid.

Yesterday I had the privilege of seeing this reintroduction first hand when I visited the site with my colleague Dr Duncan McCollin.  Duncan and I are supervising a PhD student, Jamie Wildman, along with Prof. Tom Brereton, Head of Monitoring at Butterfly Conservation (BC), and the University of Northampton’s Visiting Professor in Conservation Science.  Jamie’s project will focus on understanding the habitat requirements for Chequered Skipper, and monitoring the success of the reintroduction.  I’m also hoping that it might be possible for Jamie to assess the role of this species as a pollinator of the plants it visits.  Butterflies as pollinators is a very under-researched area.

Here’s a shot of the Four Mus-skipper-teers* just before we set off to help BC volunteers to locate the skippers and record their behaviour:

Four Mouse-skipper-teers 2018-05-26 11.10.19.jpg

 

The day started unpromisingly.  It was cool and overcast, and little was flying except some hardy Common Carder Bees.  But around lunchtime things began to warm up and gradually the sun broke through and we started to see flying Lepidoptera that we excitedly chased, only to be disappointed by yet another Mother Shipton or Silver Y.  But no skippers.

As we encountered some of the BC volunteers who were also tracking the insects we were told that we had “just missed one” or that they “saw one down that ride, we marked the spot”.  One volunteer wanted to show me a photo of a Chequered Skipper that he’d just taken “so I could get my eye in”.  I politely refused; I wanted to see the real thing and didn’t want to jinx it with a digital preview.

Finally, our efforts were rewarded and we found the first skipper of several we later encountered.  The image at the head of this post is that butterfly, a sight that has not been seen in England in more than 40 years.  An exciting and privileged encounter.  The county Butterfly Recorder, David James (on the right in this next shot), is ecstatic that the reintroduction has occurred “on his patch” but also nervous at the responsibility it represents:

Skipper crew 2018-05-26 13.15.06

Later we spent time helping Jamie follow a female skipper who was showing egg-laying behaviour, moving slowly for short distances along a shrubby edge, occasionally nectaring on Bugle, and diving deep into the vegetation to (we hope) oviposit on grass leaves:

 

Skipper watching 2018-05-26 15.10.18

Although I’ve over-cropped this next image of the skipper on Bugle, I thought I’d leave it as I like the different textures and patterns, and the slightly blurry ambience:

Skipper nectaring 2018-05-26 13.06.08

The primary aim of Butterfly Conservation’s project is to return a small part of England’s lost biological heritage.  But it’s about more than just the Chequered Skipper.  It’s also about understanding how managing a network of sites for this flagship species can benefit other organisms.  The wide woodland rides that have been created are packed with plant species, amongst them at least five grasses that could be used as caterpillar food sources for the skippers, plus more than 20 nectar sources were flowering that they (and other flower visiting insects) could use.  Those other insects were plentiful too: over the day I spotted five species of bumblebees, several different day flying moths, lots of Dark-edged Bee Flies, and a few different solitary bees and syrphids flies.  We heard calling cuckoos, and four different warblers: chiffchaffs, garden warbler, whitethroats, and blackcaps.  Red kites (another incredibly successful species reintroduction) floated overhead skimming the treetops as they their cried to one another.

Rockingham Forest is a lovely part of Northamptonshire, well worth a visit.  The Chequered Skipper will be a wonderful addition to its biodiversity.  Of course there are no guarantees that the reintroduction part of the project will be a success, but if it isn’t it won’t be because of a lack of commitment from the people involved.  If the population does become established then in the future the location will be made public and butterfly enthusiasts will be able to come and pay homage to one of the few butterflies with a pub named after it.

 

*You get the puns you deserve on this blog…..

 

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Can pollinators survive sudden changes in the weather?

Snow-Warm garden comparison

Just how pollinators cope with sudden changes in the weather early in the season is a bit of a mystery.  Take 2018 as an example; my wife Karin spotted the first queen bumblebee in the garden on 6th January, investigating a camellia flower just outside the kitchen.  Over the course of the next few weeks I saw a few more at various sites, plus occasional hibernating butterflies such as the red admiral. The various social media outlets were reporting similar things, it looked as though we were going to have an early spring.

Then at the end of February “The Beast from the East” hit the UK, a weather system from Siberia that brought some of the coldest weather and heaviest snow the country had experienced for several years.  That persisted for over a week then things got much milder.  On 16th March I was in the garden and spotted the first male hairy-footed flower bee of the year, plus a mining bee (Andrena sp.), and a brimstone butterfly, and a queen bumblebee, and a red admiral.  Great I thought, spring really is here!  The next day it snowed.  A “Mini Beast From the East” had arrived, rapidly: the two pictures above making up the composite view of our garden were taken two days apart.

What happened to all of those insects I saw? Were they killed by the cold weather?  Or did they survive?  We have no firm data to answer that question – as far as I’m aware no one has ever tagged early emerging pollinators and followed their progress (I could be wrong – please let me know if I am).  It would make an interesting, though labour intensive, project but could be done using non-toxic paint of various colours to mark the insects.

I suspect that some of the pollinators I saw were killed, but most were not and simply went back into hibernation for a short period, hunkering down in safe, sheltered spots.  That makes much more evolutionary sense: any insects in the UK that cannot survive sudden changes in the weather would have gone extinct long ago.  Another clue to support this idea is the fact that plants in flower early in the season, and in some cases the flowers themselves, usually survive the cold weather and come back as if nothing had happened.  If the flowers can do it, and they have to stay where they are, surely the mobile pollinators can also do it?

As always I’d be interested in your thoughts on this topic, feel free to comment.  And while we wait for the UK to thaw, here’s some topical and rather catchy music to listen to – The Beelievers singing “Mr Gove”.

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Pollinators, flowers, natural selection and speciation: a virtual conference

Ashy Mining Bee 2017-06-17 10.55.45

It’s been a couple of years since I posted my previous “virtual conferences” on Pollinators, Pollination and Flowers and Ecology and Climate Change, a lapse that has largely been due to lack of time (my default excuse for most things these days….).  However Judith Trunschke at Uppsala University in Sweden has risen to the challenge of guest-curating her own virtual conference*.  The theme here is how pollinators impose (or sometimes don’t impose) natural selection on flowers that results in the formation of new plant species:

Timo van der Niet (IIASA 2010): Plant-diversification through pollinator shifts

Timo van der Niet (Congresos UCA 2014): Disentangling the contribution of pollinators in shaping angiosperm orchid genus Satyrium

Anne Royer (Evolution 2016): Plant-pollinator association doesn’t explain disruptive selection & reproductive isolation

Brandon Campitelli (Evolution 2016): Pollinator-mediated selection and quantitative genetics

Yuval Sapir (Evolution 2016): Rethinking flower evolution in irises: are pollinators the agents of selection?

Ruth Rivken (Evolution 2014): The mechanisms of frequency-dependent selection in gynodiocious Lobelia siphilitica

Gonzalo Bilbao (Botany 2017): Pollinator-mediated convergent shape evolution in tropical legumes

My grateful thanks to Judith for curating this great set of talks; if anyone else would like to do the same, please get in touch.

Feel free to discuss the talks in the comments section and to post links to other talks on the same topic.

 

*I’m assuming that, as all of these videos are in the public domain, none of the presenters or copyright owners objects to them being presented here.  If you do, please get in touch and I’ll remove it.

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Pollinator biodiversity and why it’s important: a new review just published – download it for free

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In a new review paper that’s just been published in the Annual Review of Ecology, Evolution and Systematics I have looked at the question of just how diverse the pollinators are, and why pollinator biodiversity is ecologically important and therefore worthy of conservation.  I’ve taken a deep time and wide space approach to this, starting with what the fossil record tells us about when animal pollination evolved and the types of organisms that acted as pollinators in the past (the answer may surprise you if you’re unfamiliar with the recent paleontological literature on this topic).  Some of the most prominent biogeographical patterns have been highlighted, and I have tried to estimate the global diversity of currently known pollinators.  A conclusion is that as many as 1 in 10 described animal species may act as pollen vectors.

As well as this descriptive part of the review I’ve summarised some recent literature on why pollinator diversity matters, and how losing that diversity can affect fruit and seed set in natural and agricultural contexts.  Extinction of pollinator species locally, regionally, and globally should concern us all.

Although I was initially a little worried that the review was too broad and unfocused, having re-read it I’m pleased that I decided to approach the topic in this way.  The research literature, public policy, and conservation efforts are currently moving at such a fast pace that I think it’s a good time to pause and look at the bigger picture of what “Saving the Pollinators” actually means and why it’s so important.  I hope you agree and I’d be happy to receive feedback.

You can download a PDF of the review entitled Pollinator Diversity: Distribution, Ecological Function, and Conservation by following that link.

Pollination ecologists should also note that in this same volume of Annual Review of Ecology, Evolution and Systematics there’s a review by Spencer Barrett and Lawrence Harder called The Ecology of Mating and Its Evolutionary Consequences in Seed Plants.  If you contact those authors I’m sure they’d let you have a copy.

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The Buzz Club: citizen scientists protecting pollinators

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This is a guest post by Charlie Dance who is Development Officer at The Buzz Club.


It’s hard to over-stress the importance of pollinators. Not only do they play an indispensable role in global food security, they’re also essential in maintaining the diversity of plant species in natural habitats, thus supporting nature as a whole. The UK is home to thousands of different pollinators including bees, wasps and hoverflies. However, while many of these species seem to be declining or disappearing, we know surprisingly little about the majority of them. Why are some disappearing, and how quickly is it happening? What can we do to help? How can we turn our gardens into pollinator havens? It was to help answer questions like these that the Buzz Club was founded in 2015.

Run by volunteers at the University of Sussex, The Buzz Club is a citizen-science charity using the power of the public to provide important data on pollinators. We run a variety of nationwide surveys and experiments suitable for all ages and ideal for wildlife and gardening enthusiasts. Furthermore, we provide information about how to make our urban landscapes more pollinator friendly.

For more information and for a list of current projects, please visit our website: http://thebuzzclub.uk/

As a membership-based organisation, we rely on the small donation of £2 per month from members, all of which goes directly towards running the charity. Not only do new members receive a complementary welcome pack containing a specially designed seed mix, bee identification chart, pollinator-friendly gardening guide, magnifying lens and stickers (see photo below), they also get to learn more about pollinators whilst helping to generate useful data that can be used in our projects.

We believe that with your help we can find out how best to conserve bees and other pollinators. Our ultimate goal is to ensure that we look after insects, giving them and us a future.

Join the Buzz Club here: https://alumni.sussex.ac.uk/buzzclub

Facebook: http://www.facebook.com/TheBuzzClubUK

Twitter: http://www.twitter.com/The_Buzz_Club


From Jeff:  if citizen science is your thing, don’t forget that the Ivy Pollinators project will run again this year: https://jeffollerton.wordpress.com/2016/10/11/ivy-pollinators-citizen-science-project/

 

Buzz Club 2.png

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6000 scientists can’t be wrong: the International Botanical Congress 2017

IBC 1

A late afternoon flight from Heathrow got me to Beijing International Airport just in time for me to enjoy a nine hour delay in my connecting flight to Shenzhen in southern China.  I finally arrived at my hotel at 2:15am, exhausted and sweaty in the 30 degree night time heat.  The one consolation is the the hotel was short of rooms so upgraded me to a suite the size of a small city, with a shower like a tropical rainstorm.  Perfect to wash off the dirt of travelling before collapsing into bed.

Why am I here and why is the hotel short of rooms?  Because 6000 scientists have descended on Shenzhen for the 19th International Botanical Congress (IBC).  The IBC is a six-yearly event that rotates around the world; I attended in 1999 in St Louis and 2005 in Vienna, but missed Melbourne in 2011.  At this IBC I’m giving two talks, one at the beginning and one at the end of the conference.  More on that later in the week.

Six thousand botanists need a big conference venue and this morning, after a late breakfast, I strolled up to the convention centre where it’s being held.  It’s enormous, the scale of the thing is overwhelming.  I wandered around whilst they were getting ready for registration opening this afternoon and took some images on my phone.

IBC 2IBC 3IBC 4

There are some fabulous displays of living plants, including this one at the main entrance:

IBC 5

These are attracting pollinators: in 10 minutes I counted lots of honey bees, one butterfly, at least two species of wasps, and a large carpenter bee (Xylocopa sp.) visiting flowers.  I only managed to photograph the first two though:

IBC 7

IBC 6

On the way back to my hotel I gatecrashed an international turtle expo.  Who knew turtles were such a big thing in China….?

OK, that’s all for now: I have to head back to the convention centre to register, so I’ll leave you with the view I’m seeing from where I’m writing this.  Shenzhen is quite a place and I’ll write more about it later in the week:

IBC 8

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Plant-pollinator networks, the time dimension, and conservation: a new study just published

Biella network

After rather a long gestation period, involving much re-analysis and rewriting, we’ve finally published Paolo Biella’s research from his Master’s thesis.  It’s a really neat plant-pollinator network study from mid-elevation grasslands in Italy’s Northern Apennine.  In it we have considered the way in which such networks could be analysed in relation to plant phenology (i.e. the timing of when they flower) rather than arbitrary time slices (e.g. months, weeks).  We have also discussed how this approach may inform conservation strategies in grasslands such as these.  The full citation with a link is:

Biella, P., Ollerton, J., Barcella, M. & Assini, S. (2017) Network analysis of phenological units to detect important species in plant-pollinator assemblages: can it inform conservation strategies?  Community Ecology 18: 1-10 

I’m happy to send a PDF to anyone who is interested in seeing the full study.

Here’s the abstract:

Conservation of species is often focused either only on those that are endangered, or on maximising the number recorded on species lists. However, species share space and time with others, thus interacting and building frameworks of relationships that can be unravelled by community-level network analysis. It is these relationships that ultimately drive ecosystem function via the transfer of energy and nutrients. However interactions are rarely considered in conservation planning. Network analysis can be used to detect key species (“hubs”) that play an important role in cohesiveness of networks. We applied this approach to plant-pollinator communities on two montane Northern Apennine grasslands, paying special attention to the modules and the identity of hubs. We performed season-wide sampling and then focused the network analyses on time units consistent with plant phenology. After testing for significance of modules, only some modules were found to be significantly segregated from others. Thus, networks were organized around a structured core of modules with a set of companion species that were not organized into compartments. Using a network approach we obtained a list of important plant and pollinator species, including three Network Hubs of utmost importance, and other hubs of particular biogeographical interest. By having a lot of links and high partner diversity, hubs should convey stability to networks. Due to their role in the networks, taking into account such key species when considering the management of sites could help to preserve the greatest number of interactions and thus support many other species.

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Public evening lecture on butterfly conservation – Tuesday 16th May – free and open to all

Gatekeeper cropped P1010472

The University of Northampton has recently approved the appointment of Tom Brereton as Visiting Professor in Conservation Science.  Tom is well known for his work with Butterfly Conservation, the organisation that monitors British butterfly and moth populations, and promotes their study and conservation.  However he also works with other organisations including the charity MarineLife.

The first task of any Visiting Professor is to present a public lecture on their work, which Tom is doing next Tuesday 16th May; it is entitled:

“Butterflies and other animals: 40 years of adventure in ecology and conservation”

The lecture begins at 6pm in The Grand Hall, Newton Building, St George’s Avenue, Northampton, NN2 6JD

Coffee & biscuits will be served on arrival at 5.30pm

Following the lecture there will be an opportunity for networking and discussion over drinks & nibbles.  The lecture is free and open to all; for catering purposes please advise Val Howe if you wish to attend:

Email: valerie.howe2@northampton.ac.uk
Telephone: 01604 893005

(Though if you decide to come at the last minute that’s also fine!)

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Generalist pollination can evolve from more specialised interactions: a new study just published

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There’s a long-standing idea in biology that ecological specialisation is an evolutionary “dead end” from which species can never emerge.  In other words, if a species becomes so adapted to a particular ecological strategy (could be feeding or habitat requirements or how it interacts with other species ) then no amount of natural selection will result in its descendants evolving different strategies, thereby diversifying into new species.  In particular it’s traditionally thought that evolving broader, “generalist” strategies from narrower, “specialised” ones is highly unlikely.

This has been much discussed in the literature on the ecology and evolution of pollination systems, where traditionally this “dead end” scenario has been accepted.  However a small number of case studies have shown that generalised pollination systems can evolve within much more specialised clades, beginning with Scott Armbruster and Bruce Baldwin’s study of Madagascan Dalechampia (Euphorbiaceae), published in Nature in 1998.

To this limited body of examples we can now add another case study: in the genus Miconia (Melastomataceae), generalist nectar/pollen rewarding strategies can evolve within a clade of plants that predominantly uses a more specialised, buzz-pollinated strategy involving just bees.

The work is part of the PhD research of Vinicius de Brito who is one of the researchers I was privileged to do some field work with in Brazil when I was there in 2013 – see my post: “It’s called rainforest for a reason, right?  Brazil Diary 6“.  Vini is the guy on the left of the photo accompanying this post.  Here’s the citation and a link:

de Brito, V.L.G., Rech, A.R., Ollerton, J., Sazima, M. (2017) Nectar production, reproductive success and the evolution of generalised pollination within a specialised pollen-rewarding plant family: a case study using Miconia theizans. Plant Systematics and Evolution doi:10.1007/s00606-017-1405-z 

Here’s the abstract:

Generalist plant–pollinator interactions are prevalent in nature. Here, we untangle the role of nectar production in the visitation and pollen release/deposition in Miconia theizans, a nectar-rewarding plant within the specialised pollen-rewarding plant family Melastomataceae. We described the visitation rate, nectar dynamics and pollen release from the poricidal anthers and deposition onto stigmas during flower anthesis. Afterwards, we used a linear mixed model selection approach to understand the relationship between pollen and nectar availability and insect visitation rate and the relationship between visitation rate and reproductive success. Miconia theizans was visited by 86 insect species, including buzzing and non-buzzing bees, wasps, flies, hoverflies, ants, beetles, hemipterans, cockroaches and butterflies. The nectar produced explained the visitation rate, and the pollen release from the anthers was best explained by the visitation rate of pollinivorous species. However, the visitation rates could not predict pollen deposition onto stigmas. Nectar production may explain the high insect diversity and led to an increase in reproductive success, even with unpredictable pollen deposition, indicating the adaptive value of a generalised pollination system.

As always, I’m happy to send a PDF to anyone who wants a copy, just drop me an email.

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Managing for Pollinators – a special issue of the Natural Areas Journal

Inula at Ravensthorpe 20160710_145426The October issue of the Natural Areas Journal is a special one devoted to the topic of “Managing for Pollinators”.  All of the papers have a North American focus but I think that they will be of general interest to anyone, anywhere in the world, who is concerned with how best to manage habitats for pollinators.  Here’s the contents page of the issue, copied and pasted from the site; I’m not sure if the full text links will work if you or your institution does not have full text access, but you should at least be able to view the abstracts:

Editorial: Pollinators are in Our Nature Full Access

Introduction by USFS Chief Tidwell – Pollinators and Pollination open access

pg(s) 361–361

Citation : Full Text : PDF (227 KB)

National Seed Strategy: Restoring Pollinator Habitat Begins with the Right Seed in the Right Place at the Right Time Full Access

Peggy Olwell and Lindsey Riibe
pg(s) 363–365

Citation : Full Text : PDF (1479 KB)

Hummingbird Conservation in Mexico: The Natural Protected Areas System Full Access

M.C. Arizmendi, H. Berlanga, C. Rodríguez-Flores, V. Vargas-Canales, L. Montes-Leyva and R. Lira
pg(s) 366–376

Abstract & References : Full Text : PDF (1302 KB)

Floral Guilds of Bees in Sagebrush Steppe: Comparing Bee Usage of Wildflowers Available for Postfire Restoration Full Access

James H. Cane and Byron Love
pg(s) 377–391

Abstract & References : Full Text : PDF (1500 KB)

The Role of Floral Density in Determining Bee Foraging Behavior: A Natural Experiment Full Access

Bethanne Bruninga-Socolar, Elizabeth E. Crone and Rachael Winfree
pg(s) 392–399

Abstract & References : Full Text : PDF (1219 KB)

Common Methods for Tallgrass Prairie Restoration and Their Potential Effects on Bee Diversity Full Access

Alexandra Harmon-Threatt and Kristen Chin
pg(s) 400–411

Abstract & References : Full Text : PDF (300 KB)

Status, Threats and Conservation Recommendations for Wild Bumble Bees (Bombus spp.) in Ontario, Canada: A Review for Policymakers and Practitioners Full Access

Sheila R. Colla
pg(s) 412–426

Abstract & References : Full Text : PDF (420 KB)

Conserving Pollinators in North American Forests: A Review Full Access

James L. Hanula, Michael D. Ulyshen and Scott Horn
pg(s) 427–439

Abstract & References : Full Text : PDF (1711 KB)

Dispersal Limitation, Climate Change, and Practical Tools for Butterfly Conservation in Intensively Used Landscapes Full Access

Laura E. Coristine, Peter Soroye, Rosana Nobre Soares, Cassandra Robillard and Jeremy T. Kerr
pg(s) 440–452

Abstract & References : Full Text : PDF (4647 KB) : Supplementary Materials

Revised State Wildlife Action Plans Offer New Opportunities for Pollinator Conservation in the USA Full Access

Jonathan R. Mawdsley and Mark Humpert
pg(s) 453–457

Abstract & References : Full Text : PDF (249 KB)

Diet Overlap of Mammalian Herbivores and Native Bees: Implications for Managing Co-occurring Grazers and Pollinators Full Access

Sandra J. DeBano, Samantha M. Roof, Mary M. Rowland and Lauren A. Smith
pg(s) 458–477

Abstract & References : Full Text : PDF (1537 KB)

The Role of Honey Bees as Pollinators in Natural Areas Full Access

Clare E. Aslan, Christina T. Liang, Ben Galindo, Hill Kimberly and Walter Topete
pg(s) 478–488

Abstract & References : Full Text : PDF (467 KB)

Food Chain Restoration for Pollinators: Regional Habitat Recovery Strategies Involving Protected Areas of the Southwest Full Access

Steve Buckley and Gary Paul Nabhan
pg(s) 489–497

Abstract & References : Full Text : PDF (732 KB)

Forbs: Foundation for Restoration of Monarch Butterflies, other Pollinators, and Greater Sage-Grouse in the Western United States Full Access

R. Kasten Dumroese, Tara Luna, Jeremiah R. Pinto and Thomas D. Landis
pg(s) 499–511

Abstract & References : Full Text : PDF (1716 KB)

Using Pollinator Seed Mixes in Landscape Restoration Boosts Bee Visitation and Reproduction in the Rare Local Endemic Santa Susana Tarweed,Deinandra minthornii Full Access

Mary B. Galea, Victoria Wojcik and Christopher Dunn
pg(s) 512–522

Abstract & References : Full Text : PDF (2880 KB)

Save Our Bats, Save Our Tequila: Industry and Science Join Forces to Help Bats and Agaves Full Access

Roberto-Emiliano Trejo-Salazar, Luis E. Eguiarte, David Suro-Piñera and Rodrigo A. Medellin
pg(s) 523–530

Abstract & References : Full Text : PDF (463 KB)

The Importance of Phenological Diversity in Seed Mixes for Pollinator Restoration Full Access

Kayri Havens and Pati Vitt
pg(s) 531–537

Abstract & References : Full Text : PDF (2208 KB) : Supplementary Materials

Stewardship in Action Full Access

Sarah Riehl
pg(s) 538–541

Citation : Full Text : PDF (595 KB)

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