Yuri Barros
Member
I think they got something in the mucus composition........
H.magnifica health & melanism in Percs?
- Thread starter maxxII
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ThRoewer
New member
The anemone species has a far greater influence than just melanism:
"The life-history traits and population dynamics of species are increasingly being attributed to the characteristics of their preferred habitats. While coral reef fish are often strongly associated with particular habitats, long-term studies establishing the demographic and life-history consequences of occupying different reef substrata are rare and no studies have monitored individuals in situ over their lifetime and determined the fate of their offspring. Here, we documented a quasi-turnover and local reproductive success for an entire population of orange clownfish (Amphiprion percula) from Kimbe Island, Papua New Guinea, by taking bi-annual samples of DNA over a 10-yr period (2003"“2013). We compared demographic and life-history traits of individuals living on two host anemone species, Heteractis magnifica and Stichodactyla gigantea, including female size, adult continued presence (a proxy for relative longevity range), early post-settlement growth, the number of eggs per clutch and "˜local' reproductive success (defined for each adult as the number of offspring returning to the natal population). Our results indicate that while the relative longevity of adults was similar on both host anemone species, females living in H. magnifica were larger than females in S. gigantea. However, despite females growing larger and producing more eggs on H. magnifica, we found that local reproductive success was significantly higher for clownfish living in S. gigantea. Life-history traits also exhibited local spatial variation, with higher local reproductive success recorded for adults living on S. gigantea on the eastern side of the island. Our findings support a "˜silver-spoon' hypothesis that predicts individuals that are fortunate enough to recruit into good habitat and location will be rewarded with higher long-term reproductive success and will make a disproportionate contribution to population renewal."
https://link.springer.com/article/10.1007/s00338-016-1485-1
"The life-history traits and population dynamics of species are increasingly being attributed to the characteristics of their preferred habitats. While coral reef fish are often strongly associated with particular habitats, long-term studies establishing the demographic and life-history consequences of occupying different reef substrata are rare and no studies have monitored individuals in situ over their lifetime and determined the fate of their offspring. Here, we documented a quasi-turnover and local reproductive success for an entire population of orange clownfish (Amphiprion percula) from Kimbe Island, Papua New Guinea, by taking bi-annual samples of DNA over a 10-yr period (2003"“2013). We compared demographic and life-history traits of individuals living on two host anemone species, Heteractis magnifica and Stichodactyla gigantea, including female size, adult continued presence (a proxy for relative longevity range), early post-settlement growth, the number of eggs per clutch and "˜local' reproductive success (defined for each adult as the number of offspring returning to the natal population). Our results indicate that while the relative longevity of adults was similar on both host anemone species, females living in H. magnifica were larger than females in S. gigantea. However, despite females growing larger and producing more eggs on H. magnifica, we found that local reproductive success was significantly higher for clownfish living in S. gigantea. Life-history traits also exhibited local spatial variation, with higher local reproductive success recorded for adults living on S. gigantea on the eastern side of the island. Our findings support a "˜silver-spoon' hypothesis that predicts individuals that are fortunate enough to recruit into good habitat and location will be rewarded with higher long-term reproductive success and will make a disproportionate contribution to population renewal."
https://link.springer.com/article/10.1007/s00338-016-1485-1
Yuri Barros
Member
nice info....
I didn´t knew abot Female size according anemone species........
I didn´t knew abot Female size according anemone species........
OrionN
Moved on
What issue? I don't know anything about this. Brief search this morning did not turn up anything. Can you give me a link or a lead so I can read about it? Thanks
Yuri Barros
Member
I think Matt Pedersen did some interview with Bill Addison or article...........
"The vast majority of “Onyx Perculas” from captive-bred lines today are descendents of the “C-Quest Line,” the name for the phenotype being coined by Addison himself and shares a distinct breeding history when compared to “Onyx” Perculas caught in the wild – Addison was fortunate enough to recall the story of the Onyx Percula in 2007. "
maybe you have to dig this article...........
"The vast majority of “Onyx Perculas” from captive-bred lines today are descendents of the “C-Quest Line,” the name for the phenotype being coined by Addison himself and shares a distinct breeding history when compared to “Onyx” Perculas caught in the wild – Addison was fortunate enough to recall the story of the Onyx Percula in 2007. "
maybe you have to dig this article...........
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ThRoewer
New member
When it comes to the influence of anemones on the color of clownfish you have to exclude heavily domesticated strains like the C-Quest Onyx that were selectively bred to have a lot of black under any circumstances.
The only observations I would consider valid are those on wild specimen and F1 generation individuals.
Another thing that should not be forgotten is that in the wild a percula usually stays in one and the same anemone for life.
As the research I quoted in my earlier post shows, the anemone certainly has an influence on the development of individuals.
So while switching a percula for one anemone species to another may cause a change in appearance, it may not undo the entire adaptation the individual had undergone growing up in a particular anemone species.
There are other research papers that found that anemonefish larva especially look for the chemical signatures of the anemone species their parents lived in.
A valid experiment would be to take the offspring of (wild collected) pairs, divide them in two groups of which one goes into the same anemone species the parents lived in and the other group goes into a different anemone species.
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The only observations I would consider valid are those on wild specimen and F1 generation individuals.
Another thing that should not be forgotten is that in the wild a percula usually stays in one and the same anemone for life.
As the research I quoted in my earlier post shows, the anemone certainly has an influence on the development of individuals.
So while switching a percula for one anemone species to another may cause a change in appearance, it may not undo the entire adaptation the individual had undergone growing up in a particular anemone species.
There are other research papers that found that anemonefish larva especially look for the chemical signatures of the anemone species their parents lived in.
A valid experiment would be to take the offspring of (wild collected) pairs, divide them in two groups of which one goes into the same anemone species the parents lived in and the other group goes into a different anemone species.
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Yuri Barros
Member
yes....wild ones are linked with Anemone species..........and captive Onyx have some genetic issue...........
check this PERCULA FARM.....
https://www.youtube.com/watch?v=-hOL8B9M3zM
https://www.youtube.com/watch?v=R8MjYwXlwY4
check this PERCULA FARM.....
https://www.youtube.com/watch?v=-hOL8B9M3zM
https://www.youtube.com/watch?v=R8MjYwXlwY4
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OrionN
Moved on
I disagree with ThRoewer sentences above
To answer the question of what cause the melanistic color lost of (some)Percula in captivity any Percula will do.
If the question is why Percula hosted by Gigantea are blacker than those that hosted by Magnifica in the wild? then only wild Percula, in the wild only. Even these same animals in captivity will not do.
As stated earlier in this thread. I have Rod's Onyx completely black, loss all color, and then regain all color with the same Magnifica. Between the color lost and the regain, she was hosted by H. malu in another tank. She regain color in the Malu, then keep the color when I moved her back to the Magnifica.
