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The abstracts that you provided don't say that. In fact, there are indicators that the change in reproduction patterns are linked with resource stress. Less food per individual and other stresses seem to cause hormonal changes that decrease the fertility cycles.
"Linked" how? Everything I've seen indicates that regulation is linked in that it anticipates crises and kicks in in order to avoid overpopulation. "Linking" them to trigger only after the crisis is underway would negate any benefit, since everything's starving before the next generation comes along.

Any benefit that is, except the one proposed by Darwin. Starvation situations were claimed by Darwin to weed out the unfit and allow only the very best to survive.

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Which scientists think this change in reproductive rates is a problem for evolution? What are their conclusions about this "self regulation" effect in regards to species survival and evolution?

Now, before you tell me to do the research (shift burden of proof), remember you're the one who said this "self regulation" of population size is a problem for evolution. So, you need to provide something more than "oh look, I found something that I declare is a problem for evolution...therefore it is!" If it is really a problem, then the scientists should have looked into it far enough to find out. Provide some support for your allegation.
Ah. So it's the "majority of scientists" out! Well played. I give up. I shall not convince you. Happy?

For anyone who allows that evolutionism may be questioned before the "majority of scientists" abandon it, This article I chanced upon yesterday, beginning at the seventh point of discussion, does a fair job of explaining these things.

Do I know the establishment's response? Naturally! We've already seen a couple, have we not? 1.) Preemptively forget the requirement for continual, intense struggle. 2.)Attempt to portray regulation as a 'miracle' of evolution. 3.) Both 1 and 2.

Dark Matter + Dark Energy = Dark Truth

"We find that such evidence demonstrates that the ID argument is dependent upon setting a scientifically unreasonable burden of proof for the theory of evolution." - Judge Jones Kitzmiller case
http://www.talkreason.org/articles/Falsify.cfm

"To Compel A Man To Furnish Funds For The Propagation Of Ideas He Disbelieves And Abhors Is Sinful And Tyrannical." - Thomas Jefferson

"And can the liberties of a nation be thought secure when we have removed their only firm basis, a conviction in the minds of the people that these liberties are the gift of God? That they are not to be violated but with his wrath?" - Thomas Jefferson