One thing I am very fond of are the different subspecies of a typical species. For instance, some butterflies have a different subspecies depending on their geographical location. Often Ireland will have a different subspecies compared to the rest of the British Isles, and in some cases Scotland will have as well.
Anyway, on the way back from work today I saw a starling by the edge of the path, and I decided to look it up when I got back home. To my surprise I found that the common starling (Sturnus vulgaris) has no less than twleve valid subspecies. The one I had seen on the way home was Sturnus vulgaris vulgaris which is found over most of Europe.
I noticed that there is also a unique subspecies on the Faroe Islands. The Faroe Islands have several unique subspecies, which I should talk about at more length at some point.
The Shetland Islands also have their own subspecies, Sturnus vulgaris zetlandicus. The Shetland Islands are home to several interesting species which I should mention in a post at some point, but these include the St Kilda house mouse, and the Orkney Vole.
The other nine subspecies are spread across Europe and Asia, and I don’t really have that much to say about them, but there is a reasonably informative wikipedia article for those who are interested, http://en.wikipedia.org/wiki/European_Starling
See you later.
Sunday, 3 May 2009
Saturday, 2 May 2009
Scarborough Castle Butterflies
As nice weather abounded today, me and Steve went for a wander to see what butterflies we could photograph.
Within minutes of reacheing our intended destination, I managed to net a large white (Pieris Brassicae) and a green-veined white (Pieris napi).
Large White. Photo courtesy of me.
Close-up of a Large White. Photo courtesy of SJV.
Green-veined White. Photo courtesy of SJV.
It didn't take us too long to see some of the other butterflies common at this time of year, small tortoiseshells abounded, as did small whites and speckled woods.
Small tortoiseshell. Photo courtesy of me.
Small White. Photo courtesy of SJV.
Speckled Wood. Photo courtesy of SJV.We only saw one peacock, and after quite a chase I managed to get this photo:
We were surprised to see on our way back a holly blue fluttering around some privet. This is the first holly blue I have seen in Scarborough.
Holly Blue. Photo courtesy of me.
Holly Blue inner wings. Photo courtesy of SJV.
Seeing the holly blue was nice, as it means I have seen ten different species of butterflies so far this year. Strangely I didn't see a single comma today.
Friday, 1 May 2009
Convergent Evolution - Example 1
For those who are unaware, convergent evolution is where similar features evolve in different lineages of animals or plants.
The example I am going to give you today is about the evolution of spines for defense. Obviously the one that springs to mind is the hedgehog.
Porcupines also have defensive spines, and are not closely related to the previous two examples. There are eleven old world species of porcupine, and twelve new world species of porcupine. What is fantastically interesting about these two groups of porcupines is that it seems that spines evolved separately in the old world and the new world.
Old World Porcupine. Photo courtesy of Wikipedia.
New world porcupine. Photo courtesy of Wikipedia.
The last example I’ll give you are the tenrecs. Tenrecs are mostly confined to Madagascar, and there are two species that have defensive spines, the greater hedgehog tenrec, and the lesser hedgehog tenrec. These two species look just like stretched versions of the more familiar hedgehog.
Unfortunately I can't find any pictures that I can use, so I insist you visit this link:
http://www.americazoo.com/goto/index/mammals/36.htm
So there you have it, five groups of animals that have all independently evolved a similar defense strategy in different places in the world. I’ll hopefully be able give you some more fascinating examples of convergent evolution in future.
Bye now!
The example I am going to give you today is about the evolution of spines for defense. Obviously the one that springs to mind is the hedgehog.
There are sixteen species of hedgehog which are native to Europe, Asia and Africa, and all of these inherited their spiny defense from a common ancestor. However they are far from the only creatures to have evolved spines.
The Australian equivalent of the hedgehog is the echidna, or to be completely accurate, there are four echidna species all of which are found in New Guinea, and of these, only the short-beaked echidna is found in Australia. Nevertheless, whilst all four of these species will have inherited their spines from a common ancestor, this ancestor is vastly seperate from the common ancestor of the hedgehogs.
Short-beaked echidna. Photo courtesy of Wikipedia
Porcupines also have defensive spines, and are not closely related to the previous two examples. There are eleven old world species of porcupine, and twelve new world species of porcupine. What is fantastically interesting about these two groups of porcupines is that it seems that spines evolved separately in the old world and the new world.
Old World Porcupine. Photo courtesy of Wikipedia.New world porcupine. Photo courtesy of Wikipedia.
The last example I’ll give you are the tenrecs. Tenrecs are mostly confined to Madagascar, and there are two species that have defensive spines, the greater hedgehog tenrec, and the lesser hedgehog tenrec. These two species look just like stretched versions of the more familiar hedgehog.
Unfortunately I can't find any pictures that I can use, so I insist you visit this link:
http://www.americazoo.com/goto/index/mammals/36.htm
So there you have it, five groups of animals that have all independently evolved a similar defense strategy in different places in the world. I’ll hopefully be able give you some more fascinating examples of convergent evolution in future.
Bye now!
Thursday, 30 April 2009
Sticklebacks & a newt
Yesterday evening, me and Steve went for a wander to Peasholm park in order to net some sticklebacks. This went well, and within mere minutes we had caught about a dozen three-spined sticklebacks. 
Snake pipefish. Photo courtesy of SJV.
Smooth newt. Photo courtesy of Wikipedia
Three-spined stickleback. Photo courtesy of Wikipedia
Three-spined sticklebacks (Gasterosteus aculeatus) are interesting little beasties. They are found in most bodies of freshwater, and are hugely variable in morphology. In the UK three species of stickleback can be found. These are the three-spined stickleback, the ten-spined stickleback (Pungitius pungitius) and the fifteen-spined stickleback (Spinachia spinachia). The ten-spined stickleback is found mainly in the south of England, and the fifteen-spined stickleback is actually a completely marine species that can be found all around the coasts of the British Isles. It can grow up to 15cm long. (Despite it being found 'all around the coast' I have never seen one, so perhaps 'all around the coast' except for Scarborough?)
The three-spined stickleback can also be found in marine environments, as some populations migrate out to sea, and only come inshore to breed.
These three sticklebacks are in the Family Gasterosteidae, and the Order Gasterosteiformes, which also contains the sand eels, the pipefish, and the seahorses. Notice that none of these species have true scales, instead they generally have bony plates which enclose the body.
Snake pipefish. Photo courtesy of SJV.(I must one day tell you about the species pairs of three-spined sticklebacks that are found in North America)
Also whilst sweeping the net through the murky water, I accidently caught a newt. Unfortunately it was too dark to take a picture, but I can assure you that it was a smooth newt, the commonest newt in the British Isles. I like newts because of their lizard-like appearance, and I have seen two of the three native British species (smooth and palmate). I have yet to see a great-crested newt, but one day I hopefully will.
Smooth newt. Photo courtesy of WikipediaIn addition to the three native species of newt, we also have two introduced species, the Italian crested newt, and the Alpine newt, but I will talk about these another day.
Bye now!
Wednesday, 29 April 2009
Why I Hate Cabbage Whites
This morning nine butterflies had emerged from their chrysalises. Right now they are all in a hanging net waiting for me to release them, which I will do shortly.
Last summer my dad planted, as usual, a couple of rows of cabbage in the garden. For a while all was well, my dad even commented that the butterflies seemed to have left them alone this year. But by the end of summer they were covered in caterpillars as never before. My dad gave me two options, either I could take the caterpillars and rear them, or I could take the caterpillars and feed them to the hens. I chose the former. The caterpillars were of the typical two species that one would find on cabbage, the large white and the small white. Small white caterpillars are nondescript and green. Large white caterpillars, on the other hand, are pale green & yellow, mottled with black patches, and covered with soft bristles. They also have, when they get older, a pair of blue eyes.
Large White caterpillar. Photo courtesy of Wikipedia.
There were overwhelmingly more large white caterpillars than there were small white, which is reflected in the fact that this year I have released about forty large whites so far, but only two small whites.
Whenever I talk to people about the different butterflies I’ve seen, the conversation usually goes along these lines:
[Me] “…. and it turned out to be a painted lady, which is the earliest I’ve ever seen one”
[Other] “Oh really? Well I don’t know that much about butterflies, but I’ve seen a red admiral before, and a cabbage white obviously”
[Me through gritted teeth] “There isn’t actually a type of butterfly called the cabbage white, there are actually four, possibly five…” * muffled sobs *
I don’t know where people get this from, even the most casual perusal of even a general book of garden wildlife will tell you that there is more than one species of butterfly which is lumped under the heading ‘cabbage white’.
In fact I decided to look up ‘cabbage white’ on t’internet and see what I found, and the third website that came up was this:
http://www.bbc.co.uk/nature/wildfacts/factfiles/398.shtml
Now, what you’ll notice is that nowhere on the page does it mention that ‘cabbage white’ isn’t even a type of butterfly, and even more ridiculously, it says that the scientific name of the ‘cabbage white’ is Pieris rapae which is actually the scientific name of the small white. Small whites do indeed feed on cabbage, but as I mentioned earlier, the proportion of large whites vastly outnumbers them. Then, to add insult to injury, the pictures of the caterpillars on the webpage are actually large white caterpillars, and thus a different species to what they said they were talking about.
And that is meant to be the ‘BBC – Science & Nature’ webpage.
So how many different species can be confused under the heading ‘cabbage white’? Well, I’ve already mentioned two of them, small white and large white, but there are others. The next most common species to get lumped in is probably the green-veined white (Pieris napi).
Green-Veined White. Photo courtesy of SJV.
Which, whilst distinctive at rest, can be devilishly tricky to tell apart in flight. Another species that can be confused is the orange-tip (Anthocharis cardamines). The males are highly distinctive, and so won’t be confused.
Male Orange-Tip. Photo courtesy of SJV
But the females, despite the green mottling on the outside of their wings, can once again be difficult to tell apart in flight.
Female Orange-Tip. Photo courtesy of Wikipedia.
These are the only species that are likely to be confused around where I live, however, outside of Yorkshire it is also possible that the wood white (Leptidea sinapis), Réal’s wood white (Leptidea reali), and possibly the rare migrant Bath white (Pontia daplidice) could also be lumped under the same heading.
So there you have it, I hate cabbage whites because they don’t exist, and also because there is the possibility that seven different species could be lumped under the same heading.
Also because I’m kind, here is a riddle for you. What does a butterfly, a moth and a fish have in common?
Last summer my dad planted, as usual, a couple of rows of cabbage in the garden. For a while all was well, my dad even commented that the butterflies seemed to have left them alone this year. But by the end of summer they were covered in caterpillars as never before. My dad gave me two options, either I could take the caterpillars and rear them, or I could take the caterpillars and feed them to the hens. I chose the former. The caterpillars were of the typical two species that one would find on cabbage, the large white and the small white. Small white caterpillars are nondescript and green. Large white caterpillars, on the other hand, are pale green & yellow, mottled with black patches, and covered with soft bristles. They also have, when they get older, a pair of blue eyes.
Large White caterpillar. Photo courtesy of Wikipedia.There were overwhelmingly more large white caterpillars than there were small white, which is reflected in the fact that this year I have released about forty large whites so far, but only two small whites.
Large White. Photo courtesy of me.
Whenever I talk to people about the different butterflies I’ve seen, the conversation usually goes along these lines:
[Me] “…. and it turned out to be a painted lady, which is the earliest I’ve ever seen one”
[Other] “Oh really? Well I don’t know that much about butterflies, but I’ve seen a red admiral before, and a cabbage white obviously”
[Me through gritted teeth] “There isn’t actually a type of butterfly called the cabbage white, there are actually four, possibly five…” * muffled sobs *
I don’t know where people get this from, even the most casual perusal of even a general book of garden wildlife will tell you that there is more than one species of butterfly which is lumped under the heading ‘cabbage white’.
In fact I decided to look up ‘cabbage white’ on t’internet and see what I found, and the third website that came up was this:
http://www.bbc.co.uk/nature/wildfacts/factfiles/398.shtml
Now, what you’ll notice is that nowhere on the page does it mention that ‘cabbage white’ isn’t even a type of butterfly, and even more ridiculously, it says that the scientific name of the ‘cabbage white’ is Pieris rapae which is actually the scientific name of the small white. Small whites do indeed feed on cabbage, but as I mentioned earlier, the proportion of large whites vastly outnumbers them. Then, to add insult to injury, the pictures of the caterpillars on the webpage are actually large white caterpillars, and thus a different species to what they said they were talking about.
And that is meant to be the ‘BBC – Science & Nature’ webpage.
So how many different species can be confused under the heading ‘cabbage white’? Well, I’ve already mentioned two of them, small white and large white, but there are others. The next most common species to get lumped in is probably the green-veined white (Pieris napi).
Green-Veined White. Photo courtesy of SJV.Which, whilst distinctive at rest, can be devilishly tricky to tell apart in flight. Another species that can be confused is the orange-tip (Anthocharis cardamines). The males are highly distinctive, and so won’t be confused.
Male Orange-Tip. Photo courtesy of SJVBut the females, despite the green mottling on the outside of their wings, can once again be difficult to tell apart in flight.
Female Orange-Tip. Photo courtesy of Wikipedia.These are the only species that are likely to be confused around where I live, however, outside of Yorkshire it is also possible that the wood white (Leptidea sinapis), Réal’s wood white (Leptidea reali), and possibly the rare migrant Bath white (Pontia daplidice) could also be lumped under the same heading.
So there you have it, I hate cabbage whites because they don’t exist, and also because there is the possibility that seven different species could be lumped under the same heading.
Also because I’m kind, here is a riddle for you. What does a butterfly, a moth and a fish have in common?
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