Juveniles vs Adults

Here's a publication that describes why it's important to collect data on juvenile (newly metamorphosed) amphibian roadkill:

"Neglected juveniles; a call for integrating all amphibian life stages in assessments of mitigation success (and how to do it)"


"While mortality at any life stage is concerning, juveniles should be of special interest when assessing road mortality and mitigation (e.g., tunnels to facilitate safe seasonal migrations) because their fate can have a disproportionate impact on population dynamics."

Posted by truthseqr truthseqr, December 14, 2019 05:00



@merav, @sea-kangaroo, @newtpatrol, @anudibranchmom, @joescience1
Hi Team,
I'm not able to find the juveniles you all have uploaded this year. Since we can't Search on Annotations, I have to depend on the word "juvenile" being either in the description or in a tag. The Search feature doesn't look at reviewer comments or field values, the only content I have control over.

So, could you please add the word "juvenile" to either the description or the tag field?

Merav and I have noticed a significant increase in the number of juveniles found dead on the road this season compared to last season. The other newt patrol project is also finding a huge number of juveniles. I think this is significant and I need to be able to extract the total numbers and percentages to give this info to the mitigation team.

Thanks to all of you for your time, effort, and passion for the newts!!

Posted by truthseqr 2 months ago (Flag)

i did not find any that i would have called juvenile... i wonder if they are moving now that there has been more rain?

Posted by joescience1 2 months ago (Flag)

I read somewhere that the juveniles don't migrate until they're about 2 years old. So I'm curious why we're seeing so many little ones this year.

Posted by truthseqr 2 months ago (Flag)

I was surprised to see so many little ones as well.

Posted by anudibranchmom 2 months ago (Flag)

A biologist from CA Fish & Wildlife told me that the juveniles we're seeing are leaving the reservoir and streams and heading up to the highlands where they'll live until they're sexually mature (approx. 2 years). These juveniles are the product of last years' mating activity, so we know that at least some newts survived long enough to mate.

Posted by truthseqr about 2 months ago (Flag)

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