Mystery solved (maybe)

An absolutely freezing evening strolling up and down the ditch, revealed more feeding signs and this time footprints.


Then, just when I was going to give up, this little creature popped it's head out (the colour has been enhanced).

The following analysis is an attempt to identify it:

Rat: The size and it's locality (in a dried ditch) made me initially think it was a brown rat. Having studied the picture (colour changed and cropped), it lacks the pointed nose and the prominant ears, as can be seen in this picture:

http://www.arkive.org/brown-rat/rattus-norvegicus/

Therefore, it is most likely to be a vole:

Field Vole (Short Tailed Vole): A field vole would explain the feeding signs as (like water voles) they feed on vegetation in the same way. However, they are smaller (10cm) and as the initial identification was a brown rate (22cm) then it is probably too big to be a field vole, as this picture shows (warning, cute picture):

http://www.arkive.org/field-vole/microtus-agrestis/

Bank Vole:Bank voles are smaller than field voles (9-11cm), so using the same logic, it's possibly not a bank vole:

http://www.arkive.org/bank-vole/clethrionomys-glareolus/

Water Vole: Given it's size, it's vole like features, nearby feeding and proximity to an existing water vole colony, the most likely identification is as water vole.

Pictures at:

http://www.arkive.org/water-vole/arvicola-terrestris/image-A2274.html

And:

http://staggsbrook.blogspot.com/2009/04/latrines-as-indicator-of-water-vole.html

This sighting is now recorded in google maps and although it is near the existing colony, it is far enough away and not directly connected to it to suggest this is a different population of water voles.



View River Ock #4 in a larger map

References:
Identification with assistance from:
ARKive (http://www.arkive.org)
About a Brook (http://staggsbrook.blogspot.com/)
Collins complete British Wildlife (1997)

Walk to work

I'm very fortunate - I can walk to work along several of the streams and rivers in Abingdon, so this blog entry is today's walk. I hope to repeat it, to see how the rivers change with the seasons.
Starting off along along the Ock, west of Drayton road, continuing along the 'Ock valley walk' (east of Drayton Road), with a detour to where the Ock joins the Thames.




Continuing the detour following the Thames along St Helen's wharf, then through the town and along the Abbey stream, with the first ducklings of the year and then the final detour - the view from Abingdon weir.




In total, a 60 minute walk, it can take 45 minutes if I'm not taking photos, looking for water voles or admiring the kingfishers.
The irony is that it can sometimes take that long to drive.

Ditch life?

Although dried out, something has been eating the shoots in the ditch running through the centre of the floodplain



Further down the ditch, there is more water and I think I heard something move for cover. There do seems to be more signs of feeding and burrows. Definitely a place to come back to.

Views of the ditch...

The stream that runs past Tescos is a delightful stroll and it offers a variety of habitats, from banks overgrown with nettles:


To ditches with little vegetation.

Although it offers what seems ideal water vole habitat, it possibly is to few and far between to sustain a population, but it's worth coming back to - especially to see what else might live their - I've seen water shrews and pigmy shrews in similar places.
The ditch running through the centre of the flood plain has dryed out in numerous places, but there are potential field signs which are worth further investigation.

Woodpecker

Song birds define their territory and attract mates by singing. Woodpeckers define theirs buy drumming their beaks against a tree,or in this case a telegraph pole.

Drawing a blank.

Several evenings this week, I've been exploring slightly further downstream, up to the weir where the Ock splits in two


As all the water vole sightings have been in one area (in blue on the map), I'm keen to know if the population is larger or if there are other colonies in the area ). Although it does look good water vole habitat and there may be some burrows, so far there have been no sightings or obvious field signs (in red).


View River Ock #3 in a larger map

I may come back to this area, but there's other places I hope to explore this weekend and next week - probably the ditches near Tescos.

Radley Brook

Radley brook is probably more of a ditch than a brook and is not connected to the Ock. It joins the Thames via the Abbey streams just north of Abingdon weir, whilst the Ock joins south of the Abingdon bridge.



Several years ago, I signed up for the Wildlife Trusts water vole survey and then preceded - over 3 or 4 years to look for signs of feeding, droppings and burrows up and down the Kennet and Avon canal in Berkshire. With nothing to show for my effort, I eventually became disillusioned and stopped doing the surveys.

Meanwhile, my lunch times were spent walking along the Thames path - which runs next to Radley brook.

Then, one lunch time I saw my first ever water vole, then another and my fascination with this endearing - if somewhat reclusive mammal was restored. I then spent many happy lunch breaks just watching them.

That was two years ago and I haven't seen one there since.

Maybe, I'm unlucky - midday isn't the best time to go looking for water voles and hopefully they're still there.
But as far as I can see the population is extinct - maybe predated by Mink; maybe drowned in the recent floods; or perhaps just a natural population crash, these things do happen.
Still, whilst the sun shines and the nettles remain low, I'll continue to spend my lunch breaks searching for water voles.

So last year, I was thrilled to find water voles on the river Ock near where I live and since they're still there, I've decided to use this blog and google maps to record this population (and other wildlife) - and with some luck, they'll avoid the same fate.


If anyone knows differently about the Radley brook water voles, please let me know.