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Maternal effects of carotenoid consumption in guppies |
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Home away from home 
Joined: 2009/11/8 8:09
From BC, Canada
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Webmasters ALA Members
Level : 15; EXP : 5 HP : 70 / 351 MP : 86 / 854
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I think there could be more benefit than this study considers, which they acknowledge, but it's an interesting read just the same.
======== Maternal Effects of Carotenoid Consumption in Guppies ========
Summary
1. Carotenoids transferred from mother to offspring may enhance the quality of the offspring. Whether such maternal effects occur in guppies ( Poecilia reticulata ) has an important bearing on mate preference evolution.
2. By raising female guppies from birth on different dietary carotenoid levels, we examined the pattern of carotenoid allocation to maternal tissue (skin) vs. eggs. Skin carotenoid content was only weakly affected by carotenoid intake while egg carotenoid content was strongly affected.
3. We then tested for effects of maternal carotenoid intake on several measures of offspring quality, including size and condition at birth, juvenile growth rate, and the size, condition, skin carotenoid content and colouration of mature sons. To test for interactions between maternal and offspring carotenoid intake, broods were split and offspring were reared on one of two carotenoid levels.
4. Offspring carotenoid intake had the expected effects on male colouration, but otherwise we found no evidence that maternal or offspring carotenoid intake influences offspring quality. It remains possible that maternal carotenoids affect offspring fitness parameters that we did not measure or that such effects depend on environmental factors that were absent in our laboratory aquaria.
5. Our review of the literature on maternal carotenoid effects in birds and fishes suggests that such effects may be taxon-specific. Thus, it seems unwarranted to assume that an adaptive trade-off necessarily exists between allocation of carotenoids to eggs vs. maternal tissues. Alternative hypotheses, such as the possibility that eggs provide a means of excreting excess carotenoids, also merit consideration.
6. Our results indirectly support the indicator model of mate preference evolution by casting doubt on an alternative hypothesis that requires females to benefit more from consuming carotenoids than males do.
========
Posted on: Yesterday 4:26
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Re: Xiphophorus xiphidium Rio Corona |
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Home away from home 
Joined: 2009/11/8 8:09
From BC, Canada
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Level : 15; EXP : 5 HP : 70 / 351 MP : 86 / 854
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They are stunners for sure. I had them a couple of years ago and look forward to keeping them again in the future.
Posted on: 9/5 20:07
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Re: Care for X.captivus "Jesus Maria" |
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Home away from home 
Joined: 2009/11/8 8:09
From BC, Canada
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Here's a few of mine... Adults just starting to color up:  The lighting in this tank can throw a yellow cast in pictures, so pardon the exaggerated colors:  Fry: 
Posted on: 8/16 5:31
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Re: Last Call - 2009 Convention Pictures |
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Home away from home 
Joined: 2009/11/8 8:09
From BC, Canada
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Level : 15; EXP : 5 HP : 70 / 351 MP : 86 / 854
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This baby has been put to bed. It should arrive in your mailbox soon!
Posted on: 8/16 5:07
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Re: Last Call - 2009 Convention Pictures |
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Home away from home 
Joined: 2009/11/8 8:09
From BC, Canada
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Level : 15; EXP : 5 HP : 70 / 351 MP : 86 / 854
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No I really need to sleep more and volunteer less, but I corrected the year in case anyone didn't figure it out. Thanks for the pictures!
Posted on: 8/14 21:24
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Re: 2011 Convention Information |
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Home away from home 
Joined: 2009/11/8 8:09
From BC, Canada
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Thank you sir!
Posted on: 8/14 21:20
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Last Call - 2010 Convention Pictures |
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Home away from home 
Joined: 2009/11/8 8:09
From BC, Canada
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Webmasters ALA Members
Level : 15; EXP : 5 HP : 70 / 351 MP : 86 / 854
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We could use more fish pictures from the convention, but we're wrapping it up so we'll need them ASAP, if we could please. You can send them to melodym{at}allnaturalpetcare.com. Please include how you would like to be credited (name).
Many t(h)anks!
Posted on: 8/13 5:35
Edited by Melody on 2010/8/14 21:23:47
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Re: mutation |
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Home away from home 
Joined: 2009/11/8 8:09
From BC, Canada
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LOL Well Aqualog All Livebearers and Halfbeaks is a fine start - it shows both domestics and wild-types. Anything by Dr. Joanne Norton is an excellent resource for Swordtail genetics. The color chart is virtually limitless. Finnage hasn't changed much - hifin, hifin lyretail, lyretail, and longfin are the basic Swordtail finnage types. Platy's can also sport a Plumetail. I agree with you - mutts are fun, and figuring out the genetics behind it is fascinating.
Posted on: 8/13 5:29
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Re: 2011 ALA Convention |
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Home away from home 
Joined: 2009/11/8 8:09
From BC, Canada
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Thanks very much for the additional information. It sounds like everything is coming together nicely!
Posted on: 8/11 20:09
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Re: mutation |
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Home away from home 
Joined: 2009/11/8 8:09
From BC, Canada
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Level : 15; EXP : 5 HP : 70 / 351 MP : 86 / 854
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Is there a specific strain that you're referring to? Your questions certainly are not dumb, but they are general enough to have the answers fill a book...LOL.
Generally speaking, an initial mutation like lyretail or albino shows up out of the blue in someone's tank. They're then selectively bred for that trait. Some are also brought into another domestic strain, as with red Platy's being crossed with Swordtails to produce a red Swordtail.
It's impossible to say how many mutations occur in the wild, as many are gobbled up. Theoretically, they can occur more often in captivity due to the smaller breeding pool, which allows for recessives to sneak into the population. That's a tad over-simplified though.
There can be highly variable outcomes when crossing domestics. While some strains may breed true, it depends on what you're dealing with.
Posted on: 8/10 1:41
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