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The odd behaviour thread! |
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will
Senior Member Joined: 27 Feb 2007 Location: United Kingdom Status: Offline Points: 1830 |
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thanks for the additional possibilities Caleb. Am I right that the tadpoles of certain species have their growth inhibited through ingestion of certain microorganisms in the faeces of other tadpoles? if so, the disadvantage of faecal ingestion would seem to outweigh any short term nutritional benefit and you might expect it to be selected out, I guess? I think the competition argument is more convincing, although from the individual tadpole's perspective what you gain in aggregating might be lost (and even outweighed) by increased intraspecific competition (as the niche would be closer for conspecifics than between species, presumably).
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Caleb
Senior Member Joined: 11 Apr 2011 Status: Offline Points: 660 |
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Yes, I believe so. I was under the impression (though I might be wrong) that this is mainly microbes from later stage tadpoles inhibiting early stage ones- so the ones that grow on fastest get a bigger share of the food, meaning that at least some should be able to metamorphose if food or water runs low. This leads to the question of whether shoaling tadpoles are always of similar size...
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will
Senior Member Joined: 27 Feb 2007 Location: United Kingdom Status: Offline Points: 1830 |
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good point - if they are siblings then you would expect this to be roughly true I guess.
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GemmaJF
Admin Group Joined: 25 Jan 2003 Location: Essex Status: Offline Points: 4359 |
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Thanks for posting the references Caleb. I guess with these things it is always a chicken and egg thing, any one of the reason could be why they do it and all could be valid reason for why they continue to do it. It would appear there is some advantage to it though rather than they do it because they can!
I'll be looking out next year to see if I can gauge if all the animals are the same or similar size. Something makes me think that smaller ones do get in on the act but are peripheral to the main mass of tadpoles, but I'm relying on memory of observations from several years ago so most likely totally unreliable. |
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Liz Heard
Senior Member Joined: 27 Apr 2010 Location: South West Status: Offline Points: 1429 |
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Think this is another excellent idea for a thread and really enjoying reading the contributions - cheers all!
Dave Fixx' November Adder in the "Herp a day" thread reminded me that in recent years i've seen various UK species (inc 1 herp) out of season: EG Crested Newts in breeding dress in November, egg-laying in early January (although the latter activity was briefly interrupted by a cold snap) Field Blewits Lepista saeva springing forth in March (normally Oct/Nov) Dryad's Saddle Fungus Polyporus squamosus fruiting in November (normally spring) and how about this Suz, i found some Cow Parsley Anthriscus sylvestris in flower just last week (05/11/14) . There were several plants in bloom: |
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Liz Heard
Senior Member Joined: 27 Apr 2010 Location: South West Status: Offline Points: 1429 |
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Hello folks
While watching frog mating balls a-rollin' an' a-tumblin' in a pond last month, something caught my eye. Up came a pair of males, one of which was trying to mate with a fem GCN - and crushing the very life out of the poor girl. I know this isn't THAT odd, that frogs and toads quite often get it wrong and try to mate with other species like goldfish and even people's hands (RobV), but this was the first time i'd seen this particular mismatch myself. Anyway, i managed a couple of hasty pics before the ball disappeared under the water again: |
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Richard2
Senior Member Joined: 01 Dec 2010 Status: Offline Points: 285 |
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Did you try to rescue the newt?
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Liz Heard
Senior Member Joined: 27 Apr 2010 Location: South West Status: Offline Points: 1429 |
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Hi Richard,
No, i couldn't have reached it from where i was. Of course i felt very sorry for it and did contemplate trying to find a stick or something, but the 'species ball' quickly disappeared under the pond weed again anyway. I waited a while to see if it would resurface, but it didn't. BTW I'm really enjoying the book and for what my opinion's worth, would echo both the comments on the dust jacket and the feedback of forum members. So much of it chimes with me too, from the first tingles of dedicated excitement and wonder through resultant familial discord to collecting tea card sets. I love the fact that it has such a broad scope of accessibility and it's honest - when a memory was hazy, you simply owned up. |
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will
Senior Member Joined: 27 Feb 2007 Location: United Kingdom Status: Offline Points: 1830 |
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great sighting Ben. For what it's worth, when I've seen frogs grab large GCN they have always released them within a few minutes, but of course that's not a guarantee that this one would get away...
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Liz Heard
Senior Member Joined: 27 Apr 2010 Location: South West Status: Offline Points: 1429 |
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Thanks Will. I guessed others here would have seen it happen but couldn't recall seeing any pics of it on the forum - at least since i've been a member. So hopefully a worthwhile share!
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