Bats at Delamere

This last weekend was pretty busy as I went along to Chesire Wildlife Trust's Bat & Moth evening as well as taking a day out at Yorkshire Sculpture Park.  On the upside, that makes for quite a few articles.  On the downside, that makes for no time in which to write them, especially when you consider that I work part-time as a lecturer and it's enrollment week!

Friday's Bat & Moth evening was pretty nifty, split into a bat watch and walk, as well as an introduction to moths and moth trapping, so I'm going to do a few entries on it in a similar way.

The bat watch & walk was really interesting and informative, though a bit more technical information about the frequency ranges of the bats we were picking up on the bat detectors would have been more helpful -- but you can't have everything.  We did an emergence watch and saw quite a few brown long-eared bats (Plecotus auritus) leaving their roosts in one of the older buildings at Delamere.  They were really loud at the 43 kHz range on the bat detectors, which is no surprise as their call range is 27-56 kHz.  However, it's really worth noting that you'll see these critters before you hear them usually as the detectors only work on their quiet calls up to a distance of 6m, hence their other name, whispering bats.  A good daylight indicator of these chaps being around is moth wings under the roost (most favoured moth being the Yellow Underwing) and of course, bat droppings on the wall.

As soon as they left the roost, they immediately headed for the closest tree to feed.  They are gleaning feeders, meaning that they eat the insects that alight on leaves and tree bark.  Unfortunately, as it was a bit dark and the bats were a bit far away (who'd've thought, eh?) I wasn't able to get any pictures of any bats that evening, however, here's a picture from wikimedia commons of what a brown long-eared bat looks like:

They look far more charismatic as a species when they're moving and not stunned.  Bad photos even happen to bats, apparently!

The next bats we fleetingly saw and certainly heard were the pipistrelles.  There are two types of pipistrelle -- the common pipistrelle (Pipistrellus pipistrellus) and the soprano pipestrelle (Pipistrellus pygmaeus).  The main identifying difference if you're spotting using a detector is that the common pips have a call with most energy at 45kHz, whereas the soprano pips have a higher echolocation call at 55kHz.  We also heard a few social calls down in the 20kHz range.  Social calls are the bat world's version of a male bat calling out "hey, ladies!", especially when you bear in mind that bats have harems. 

The calls of these bats are interesting to listen to as you can actually hear them hunting.  When they dive to catch an insect, it sounds like someone has just blown a raspberry.  When it stops, chances are that the bat is having dinner.

I'm fairly certain I also heard a Natterer (Myotis nattereri), though as the pips were around at the time and were being pretty loud, it was hard to tell.  However, it wasn't the same sound and the frequency went as high as 70kHz before suddenly stopping rather than fading out.  The lovely folks from the local bat group seemed to think it was a good possibility though.

Either way, they were amazing to watch and to hear.  It's just a shame their body-clocks are so antisocial!

Bog Rosemary

Another plant we found at Abbot's Moss was bog rosemary (Andromeda polifolia).  It's a lovely little plant that is only found in bogs in peat-accumulating areas, often alongside Sphagnum mosses, though there are some high maintenance cultivars available from some garden centres.  The plant below was found on a raised moss hummock, growing in amongst cranberry plants:

This is a distinctive plant, called bog rosemary because the leaves look so much like actual rosemary (Rosmarinus officinalis, that is).  Of course, you'd only make that mistake the once as the plant is quite toxic, containing the same poisonous compound as rhododendron.  This particular toxin, which is referred to in the 2009 film Sherlock Holmes as "hydrated rhododendron" has several names including grayanotoxin, rhodotoxin and andromedatoxin.  The end result is the same though -- depending on the dose, the unfortunate sufferer will experience excessive salivation, sweating, dizziness, weakness, numbness, low blood pressure and vomiting.  In high doses it causes a loss of co-ordination, muscle weakness, slowing of the heart and dangerous palpitations.  Fortunately, this type of poisoning is rarely fatal and generally lasts less than a day.  This is doubly fortunate seeing as honey made from plants that contain this toxin (usually rhododendron) causes these symptoms -- in which case these problems are referred to as "mad honey disease."  As a side note, tainted honey was used to poison invading armies at least twice in ancient Rome.  Apparently, locals didn't like the invading Roman army coming to town and fled leaving these amazing stores of honey, which the 1000 strong Roman army then ate.  It didn't go so well for them from that point on as the Roman force was incapacitated, defeated and sent on home!

Bog rosemary has had a few uses in it's own right though.  According to Duke, 1998, the Ojibwe Indians used to create a cold tea by macerating the leaves in water.  The cold part is important because heat draws out the toxins, making the tea poisonous.  Apparently it's very nice, but even as an actual card-carrying native, I'm not sure I'd be willing to try that one!  In Russia, the plant was used in the leather tanning process.

Linnaeus himself gave the scientific name to bog rosemary in 1732, naming it "Andromeda" because it "is always fixed on some turfy hillock in the midst of the swamps, as Andromeda herself was chained to a rock in the sea, Which bathed her feet as the fresh water does the roots of the plant."  Mr. Linnaeus had quite the imagination, as he saw the frogs as the sea monsters from the Andromeda myth -- and even did drawings on this theme:

 (From WikiMedia Commons)

That's quite an imagination.  I just saw a pretty flower in a bog that looked like a cross between bell heather and rosemary.  I somehow feel like I'm letting the man down!

Sundews!

Or more specifically Drosera rotundiflora, the common sundew, round-leaved sundew or archaically, youthwort.  It's an interesting little plant -- for a start, it's carnivorous.  Sundews live in bogs, marshes and fens which are all nutrient poor areas.  The sundew's workaround for this is to snack on insects which are attracted to the plant because of two things:  Colour and mucilage.

The bright red colour attracts the insects.  The mucilage (sugary plant goo, blobs of which you can see on some of the tentacle parts of the leaves above) covers the leaves of the plant; whilst initially the mucilage seems like ideal food for insects, it's worth noting that this plant goo stretches up to one million times it's initial size.  Within 15 minutes of an insect contacting this goo, it dies, either of exhaustion or asphyxiation as the plant goo covers the insect's body.  The plant then secretes digestive enzymes and then absorbs the digested insect goo through its leaves, extracting the nitrates and other nutrients lacking in the soil.  I'm not sure I'd care to go to dinner with a sundew...

Sundews tend to be fairly obvious as they're a red leaved plant with tentacle bits on a bog (the one above is growing on Sphagnum).  There are a few varieties about though.  In the UK, we have three -- round-leaved sundew, oblong-leaved sundew and the great sundew.  Round-leaved sundew has the most widespread range, covering bogs, fens and marshes almost throughout the UK.  Oblong-leaved sundew is less common, occuring in locations that are not necessarily on the coast, but nearer the coastline.  The great sundew occurs mostly in Scotland, parts of the northwest, parts of west wales and a few populations in Norfolk.

Extracts of this plant are used today as an anti-inflammatory and anti-spasmodic in medications.  In the past, it was taken in a tea and used for dry coughs, asthma, tuberculosis and bronchitis.  The Scots also used to make a purple dye from the roots of this plant as well as making a type of liquer using the leaves of all three British sundews.  That recipe is from the 14th century -- and as much as I have an interest in history, I'm really not too sure about sundew liqueur!  If you're interested, a really long blog post about liqueurs of this type can be found at http://www.historicfood.com/rosolio.htm.

Birch Polypore

As this isn't a blog just about mosses, I figured I would do an entry on another species we spotted at Abbot's Moss -- the Birch Polypore (Piptoporus betulinus).  This is a bracket fungus also called birch bracket or razor strop and grows almost exclusively on birch trees.  It's necrotrophic, meaning that it's a fungus that kills its host (in this case, the host descends into brown rot after).  This is actually in the name of the fungus; Pipto is a Greek word with a few meanings including "to fail", "to fall from power by death"  and "to perish, i.e come to an end" (Greek Lexicon online).  Therefore, if you see this mushroom on a tree, you know that tree is either dying or dead.  Literally, the name basically means "porous birch decliner."

They're pretty easy to spot too -- firstly, they'll be on the dead birch trees, especially silver birch.  Secondly, the cap folds over to make a smooth rim around the pore surface (no gills here!).  The top surface is whitish-brownish-grayish.  The fungus itself is has a whitish pore surface which will go a brownish-grey with age; it also has between 2-4 pores per millimetre.  I was able to get a picture of one from my walk in Dyson Woods (unfortunately the ones at Abbot Moss were quite high up) -- the one below felt really quite rubbery, but as they age they feel much more like cork.  This one is a bit slug eaten:

They smell quite mushroomy and technically it's edible but it's really quite bitter apparently (I take it as a hint that if someone says "technically edible" then it's not really).  It's got some interesting historical (and current) uses though.  When I did my insect ID course, we used strips of this stuff to mount the tiniest of insects with the tiniest of pins.  Older mushrooms would also make pretty good slow match tinder.

Outside of that, it's called "razor strop" because people used to (and still do) use rectangles of the dried mushroom as a strop.  Apparently you can cut out a rectangle, dry it on a radiator and just sharpen your knives with it -- it creates its own abrasive.  You'd be wanting to use the top surface of the mushroom for that.  The underside of the mushroom (the porous side) can also be cut thin and used as micropore plasters when the mushroom is fresh.  So, it sharpens and mitigates against the invariable cuts!

Medicinally, it contains anti-inflammatory compounds and has anti-bacterial properties.  It's also been discovered in the possession of Otzi the Iceman -- Europe's oldest mummy at 5,000 years old.  He'd been suffering from whipworm before his death and this mushroom contains polyporenic acid -- a compound that is toxic to this particular parasite.  It is not unreasonable to suspect he was using it as medicine, but how on Earth the connection between this mushroom and those symptoms was made is anyone's guess!

More polytrichum! (Commune)

I was thinking over this entry (and the previous one) earlier and I realised something -- the word "Polytrichum" isn't necessarily an easy word to read and then pronounce correctly.  So, for the record, it's pronounced "politrickum" -- or at least, in the UK it is.

The second moss we saw at Abbot's moss was Polytrichum commune.  It's common names include Common Haircap Moss, Common Hair Moss and Great Goldilocks.   These species of moss are called hair mosses because because the spore producing part of the moss (sporophyte) has hairs that stick out from the protective hood that covers the spore case (the calyptra).  The word "calyptra" is medieval Latin, from the Greek word "kaluptein" (to cover).

Common Haircap Moss is bigger than Juniper Haircap -- in fact, it can grow up to 28 inches long, though usually it reaches anywhere between 2-12" long and looks far more "bottle brushy" than the Juniper Haircap:

Other differences include toothed leaves with parallel sides.  It also has brown leaf tips.

It's found throughout the more temperate areas of the Northern Hemisphere and grows in heathlands and bogs.  It also grows in Australia and New Zealand and has been found woven into the fabric of Maori cloaks.  It's other uses include being made into doormats and brushes in Sweden and being used for bedding and quilting by Linnaeus himself -- and he would not be alone in doing this in the late 1700s!  Oil from the plant was used as a rinse for hair in addition to it teas being made to relieve gall bladder and kidney stones. 

Finally, baskets made of Common Haircap have also been found, though these were baskets made by Romans in around 86AD in Newstead, England:

I found this in a digitised version of a book written in 1911 by a chap named Curle.  He also writes "The stems of this moss are commonly a foot to eighteen inches long, and often attain a length considerably greater. The central stele, when cleaned, forms, as I have proved for myself, a tough pliable strand easily plaited, and quite suitable for the formation of such articles as baskets. When freshly cleaned, the core has a reddish colour and glossy surface, and basket-work of the material would not only be quite strong, but would, at least at first, have an attractive appearance."

He also notes that the tradition of doing this was probably pre-Roman.  If you want to read more, the digitised version of the book is here:  http://www.curlesnewstead.org.uk/index.htm

The Two Types of Moss

On the training day at Abbot's Moss, Martha showed us several plants, mosses and one liverwort (which sadly I couldn't take a picture of due to my camera battery dying).  All mosses can be divided into two types of moss -- acrocarpous and pleurocarpous mosses.

It all sounds dead complex, but it's not.  Simply put, acrocarpous and pleurocarpous are both "new Latin" terms (i.e. they come from Greek, but got Latinised for use in science terminology, in this case, in the late 1800s).  Carpous (or carpus) comes from the world karpos, which means "fruit", so it's all about where the fruiting bodies of the moss actually lie.

Acro (or Akro) means beginning, top or summit.
Pleur (or Pleuro) means "of or relating to the sides" (Merriam-Webster and dictionary.com).

So whether or not a moss is acrocarpous or pleurocarpous is simply a case of whether its fruits appear at the top or at the sides of the moss.  This dictates how the mosses grow:  Acrocarpous mosses don't have branches.  Pleurocarpous mosses do.  That's about the size of it.  No, really.

The first moss that we spotted was an acrocarpous moss, specifically Polytrichum juniperinum (many haired and a bit like juniper, or so Carl Ludwig Willdenow thought when he named it in the late 18th to early 19th century...).  It's commonly called "Juniper Haircap Moss".  Polytrichums tend to look a bit like bottle brushes, which you can see below:

The leaves of this moss have rolled margins rather than teeth.  The leaf tips are brown and the leaves themselves clasp the stem.  The brown leaf tips are what distinguishes it from other Polytrichum species.  This specimen had rhizoids that were evident at the base of the stem, though I'm not sure you can see them in the picture.  They look like roots and from what I gather, are basically the moss equivalent.  Part way through examining the moss, the leaves started to close up towards the stem -- so we sprayed it with water and the leaves unfurled again, which was pretty cool as you could watch it happen.   This plant has male plants and female plants too, though this one is a bit too young to tell, I think.

The cool thing about this moss is that it grows on every single continent -- including Antarctica.  It's just a little bit sturdy and doesn't mind a bit of disturbance or exposure.  In fact, it thrives in those areas and areas that are dry, nutrient poor and acidic, but it'll happily grow elsewhere too.

According to Lakehead University (Ontario), herbalists in the past used this as a diuretic for conditions such as dropsy, kidney stones and gallstones -- mostly because it could be used indefinitely without causing nausea.  Source:  http://www.borealforest.org/lichens/lichen10.htm).

I'm so glad we've got modern medicine...

The week of ecology... and work

I did make it to the woodlands the next day, though I mostly wandered through with the OH, pillaging for blackberries (originally destined for gin, in an ideal world, but finally destined for eating).  Sadly, although it's mixed deciduous woodland with a lot of silver birch and some hazel and oak, the woodland appears to be somewhat over-managed.  I understand removing standing deadwood within 10m of a path (in a way), through H&S, however, in some areas the woodland appears to be managed beyond this.  The knock-on effect is a lack of fungal species.  In this type of woodland, you'd expect to find lots of Birch polypore -- I found two.  Sadly, there also seems to be people "tidying up" the woodland.  I'm all in favour of making places accessible and sure, habitat piles are grand, but... some standing deadwood needs leaving behind.

Last Sunday I went out to a site in Cheshire to study mosses and liverworts.  We spent most of the day squinting at things and I've an entry or two about that coming up (hopefully!).  What *was* nice is that it appears my mycology is coming along nicely and there were lots of bog species (and fungi -- including LOADS of birch polypores!) on this site, including some sundews, which I've never seen before -- again, pictures to follow in a separate entry...

Monday I was at Record again and I spent the day on MapInfo, digitising site boundaries and entering phase 1 survey data, as well as assisting in some database recording and species ID.  Tuesday, I received a book in the mail...

I've only read a chapter or two, but I'm taking it to heart. It's possibly my best purchase of the last little while.  I'm thinking of doing the plant challenges -- and using the blog to help me expand my knowledge base about the plants.  In short -- it's two plants every three days.  I'd be happy to try a species per day for the next working week and then take it from there.  Perhaps game on?

Thursday, I was suppose to go on a bat survey. Only the client cancelled, sadly.  And the ecology firm only told me two hours beforehand -- when I contacted them.  Good communication is so important!  I put in another CV with another firm on Friday.  I also received a rejection letter from the arboricultural surveyor position.  As far as rejection letters go, it's one of the nicer ones I've had:

"We were particularly impressed by your approach and the standard of your work. We will contact you if an opportunity arises where we could employ your skills..."

I knew I was their wildcard.  I'm glad they liked me enough to reply so personally.  I'm going to keep on swimming.  I'll get there.  I know I will.  And to be honest, it was a reply that gave me hope rather than saddened me.  My work is good.  My skills are good.  I'm just not a specialised arboricultural surveyor.


And today?  Today brought me a refund from HMRC for taxes taken in 2005-2006.  Not a bad week all in all!