Re: {Disarmed} Re: [vernalpool] Re: Early spring migration

Chris, thanks for that. What's the variation around your average first
date of migration for spotties?

Matt

On Thu, Feb 23, 2012 at 1:14 PM, Christopher D Yearick <cdy3@cornell.edu>wrote:

> **
>
>
> Cliff's Notes version from Sexton's study:
>
> Primary Condition
> 3 day mean temperature of 41.9° F / 5.5° C
> Soil temperature @ 30 cm greater than 39.2° F / 2.13° C
> At least 0.16 inches / 0.4 cm of rainfall
> A reversal of the soil temperature profile (surface is warmer than
> sub-surface)
>
> Secondary Condition
> 3 day mean temperature of 35.8° F / 2.13° C
> Soil temperature @ 30 cm greater than 37.4° F / 3° C
> At least 0.16 inches / 0.4 cm of rainfall
>
> I tested Sexton's criteria in Upstate NY from 2003 through 2010 and the
> same conditions on my study population of spotted salamanders followed
> exactly in all years but one, which I think was 2005 where we never got any
> warm days in March. But the inversion of soil temps seemed to be the key.
> The 2005 exception was when we had equalization of soil temps at the
> surface and 30 cm. Oddly, rainfall was not always a necessary component. I
> was out one night that was dry and you could hear the rustling of leaves
> all over the forest surrounding the pool as salamanders made their way in.
> There had been heavy snowmelt the night before and a 75 degree sunny day
> preceding the influx of salamanders that night.
>
> Sexton's criteria never worked with Jeffersons. Had some migration events
> that I couldn't figure how they got through frost, let alone ice cover on
> the pools.
>
> For what it's worth, the average date for first migrants at my study pool
> from the last nine years is March 17 for Jefferson salamanders and March 29
> for spotted.
>
> Chris
>
>
> -----Original Message-----
> From: vernalpool@yahoogroups.com [mailto:vernalpool@yahoogroups.com] On
> Behalf Of matt burne
> Sent: Thursday, February 23, 2012 12:04 PM
> To: vernalpool@yahoogroups.com
> Subject: Re: {Disarmed} Re: [vernalpool] Re: Early spring migration
>
> Thank you. Leo responded off line with this link to the abstract:
>
>
> http://www.mendeley.com/research/effects-temperature-precipitation-breeding-migration-spotted-salamander-ambystoma-maculatum-9/
>
> Cheers,
>
> Matt
>
> 2012/2/23 <Jessica.S.Veysey.00@alum.dartmouth.org>
>
> > **
>
> >
> >
> >
> > Sure - it's:
> >
> > Sexton OJ, Phillips C, and JE Bramble. 1990. The effects of temperature
> > and precipitation on the breeding migration of the spotted salamander
> > (Ambystoma maculatum). Copeia 1990(3): 781-787.
> >
> > Jessica
> >
> > --- You wrote:
> > Can you provide the citation? Attachments don't fly in this list.
> >
> > Matt
> > --- end of quote ---
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>

[Non-text portions of this message have been removed]

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