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Witcombe Reservoir |
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Liz Heard
Senior Member Joined: 27 Apr 2010 Location: South West Status: Offline Points: 1429 |
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Posted: 01 Jun 2020 at 12:35pm |
Hello all
Just thought I’d share this as I thought it was an impressive spectacle. The black line represents countless toad tadpoles resting/feeding along the margin of one of the lakes at Witcombe Reservoirs. Although the concentrations varied a bit (never less than numerous though!), it extended unbroken for around 200 metres - the entire length of the northern boundary. You won’t be surprised to learn that the location is quite far from any significant roads! Cheers Ben Edited by Liz Heard - 03 Jun 2020 at 7:06pm |
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chubsta
Senior Member Joined: 26 Apr 2013 Location: Folkestone,Kent Status: Offline Points: 430 |
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wow!
must be a good population in the area, hopefully many will survive. is there any way of differentiating toad and frog tadpoles? |
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Liz Heard
Senior Member Joined: 27 Apr 2010 Location: South West Status: Offline Points: 1429 |
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Yes, by appearance, behaviour and timing.
Although both start out dark, it isn’t long before frog tadpoles become brown in colour (with attractive ‘speckles’ if you look closely). Toad tadpoles however, remain black. Once you’ve got your eye in, you can also tell by looking at the tail which is shorter with a more blunt tip in ‘toadpoles’. If the pond has fish and/or you see lots of tadpoles swimming about boldly in open water (or even congregating/shoaling en masse as above), then they are toad. Frog tadpoles tend to become more secretive as they grow (and their numbers diminish), hiding still among vegetation or in the mud at the bottom of the pond. Of course, toad tadpoles generally hatch later than frog too. Edited by Liz Heard - 03 Jun 2020 at 7:44pm |
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GemmaJF
Admin Group Joined: 25 Jan 2003 Location: Essex Status: Offline Points: 4359 |
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Thanks for sharing, that is quite a sight! I find toad tadpoles fascinating in behaviour, on several occasions now I've observed 'shoaling' which is amazing to see. Still seems to be much speculation on why they do it, though I like the idea it creates a vortex that brings up nutrients from silt at the bottom of water bodies.
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Liz Heard
Senior Member Joined: 27 Apr 2010 Location: South West Status: Offline Points: 1429 |
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Hi Gemma
Yes, there's this on the Froglife website, but it seems at odds with my sighting which was one long continuous congregation rather than distinct separate groupings. https://www.froglife.org/2018/05/31/croaking-science-kin-recognition/ |
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GemmaJF
Admin Group Joined: 25 Jan 2003 Location: Essex Status: Offline Points: 4359 |
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Seen it at several sites, each time a single swirling mass rather than groups. One of the smaller ponds made it reasonably easy to estimate the mass was likely to include the majority of toad tadpoles present, so though the research on the tadpoles being closely related is interesting, it is also somewhat at odds with my own observations.
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Liz Heard
Senior Member Joined: 27 Apr 2010 Location: South West Status: Offline Points: 1429 |
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Me too though there was no silt where the tadpoles were at the above location. Only gently sloping bare concrete with what looked possibly like minor algal growth in the thin lines between the sectioning. The numbers were fewest beneath, and in the shadowing just either side of, the jetty in the first pic (where it will have been colder). Here, the tadpoles remained roughly in line with the others, but were more in flux and swimming around. Like you, on occasion elsewhere I've observed great clouds of toadpoles swimming and swirling in close formation like fish. This has been at, or very close to, the surface of steep sided and quite deep ponds. Can't say I noticed the water becoming any cloudier in their wake though! |
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