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When crowded tadpoles (Rana arvalis and R-temporaria) fail to metamorphose and thus fail to escape drying ponds

Loman, Jon LU (2002) In Herpetological Journal 12(1). p.21-28
Abstract
Do moor frog (Rana arvalis) and common frog (R. temporaria) tadpoles increase developmental rate if there is a risk of their pond drying up before metamorphosis? To study this, I performed an experiment designed to mimic natural conditions in many drying ponds. The number of tadpoles per tank was constant during the experiment but the water level was lowered in experimental tanks so that crowding increased. Experimental tadpoles grew and developed more slowly than control tadpoles that were in constant water volume. Also, metamorphosis was delayed (i.e. a smaller proportion had metamorphosed when the experiment was concluded on I August) and the metamorphs were smaller. I conclude that, due to crowding, the tadpoles in this experiment were... (More)
Do moor frog (Rana arvalis) and common frog (R. temporaria) tadpoles increase developmental rate if there is a risk of their pond drying up before metamorphosis? To study this, I performed an experiment designed to mimic natural conditions in many drying ponds. The number of tadpoles per tank was constant during the experiment but the water level was lowered in experimental tanks so that crowding increased. Experimental tadpoles grew and developed more slowly than control tadpoles that were in constant water volume. Also, metamorphosis was delayed (i.e. a smaller proportion had metamorphosed when the experiment was concluded on I August) and the metamorphs were smaller. I conclude that, due to crowding, the tadpoles in this experiment were not able to speed up development rate adaptively. Performance of the tadpoles in the experiment was compared to that of R. temporaria tadpoles in the field. These lived in a pond where desiccation resulted in division of the water body into a small pool and a large pool. The small pool dried out completely before the rest of the pond. Tadpoles in this pool were smaller and had relatively smaller hind legs, suggesting slower development. This pattern confirms the result of the experiment, supporting my suggestion that the experimental set-up mimicked many natural situations. Of particular interest is the fact that other studies-carried out both in the same geographical area and elsewhere-have shown R. temporaria to have the ability to respond adaptively to pond drying. The fact that it did not do so in this particular experiment, as well as in the field pond studied here, shows that care must be exercised when extrapolating from one study to the properties of a species. Different conditions, both in the field and in experiments, may well give different responses. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
in
Herpetological Journal
volume
12
issue
1
pages
21 - 28
publisher
British herpetological society
external identifiers
  • wos:000175926000003
ISSN
0268-0130
language
English
LU publication?
yes
id
7c5d4d2a-0251-4b54-b254-34013dda7a28 (old id 145580)
date added to LUP
2007-06-25 10:26:52
date last changed
2016-04-16 03:23:39
@article{7c5d4d2a-0251-4b54-b254-34013dda7a28,
  abstract     = {Do moor frog (Rana arvalis) and common frog (R. temporaria) tadpoles increase developmental rate if there is a risk of their pond drying up before metamorphosis? To study this, I performed an experiment designed to mimic natural conditions in many drying ponds. The number of tadpoles per tank was constant during the experiment but the water level was lowered in experimental tanks so that crowding increased. Experimental tadpoles grew and developed more slowly than control tadpoles that were in constant water volume. Also, metamorphosis was delayed (i.e. a smaller proportion had metamorphosed when the experiment was concluded on I August) and the metamorphs were smaller. I conclude that, due to crowding, the tadpoles in this experiment were not able to speed up development rate adaptively. Performance of the tadpoles in the experiment was compared to that of R. temporaria tadpoles in the field. These lived in a pond where desiccation resulted in division of the water body into a small pool and a large pool. The small pool dried out completely before the rest of the pond. Tadpoles in this pool were smaller and had relatively smaller hind legs, suggesting slower development. This pattern confirms the result of the experiment, supporting my suggestion that the experimental set-up mimicked many natural situations. Of particular interest is the fact that other studies-carried out both in the same geographical area and elsewhere-have shown R. temporaria to have the ability to respond adaptively to pond drying. The fact that it did not do so in this particular experiment, as well as in the field pond studied here, shows that care must be exercised when extrapolating from one study to the properties of a species. Different conditions, both in the field and in experiments, may well give different responses.},
  author       = {Loman, Jon},
  issn         = {0268-0130},
  language     = {eng},
  number       = {1},
  pages        = {21--28},
  publisher    = {British herpetological society},
  series       = {Herpetological Journal},
  title        = {When crowded tadpoles (Rana arvalis and R-temporaria) fail to metamorphose and thus fail to escape drying ponds},
  volume       = {12},
  year         = {2002},
}