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he museums in Halifax (and might be on this list - I Hi Andrew, others, As a matter of interest, where does the 7500 years isolation come from? It sounds more recent than the time since the island would have emerged initially from the last ice age. Is the idea that sea level was so low say 10,000 years ago that the mice could have come up from the south as ice retreated north, and could have moved around freely including getting to Isle Haute, because sea level was much lower? And that 7500 b.p. is the estimated time that sea level had risen sufficiently to cut off the island? I couldn’t find this in skimming the report on your 1997 expedition. Thanks for the link to the 1997 expedition report. I checked it for invertebrates and this led to a reference, new to me, Wygodzinsky & Schmidt (1980), who had surveyed the Atlantic coast from here down to about New York for (wingless) jumping bristletails. They conclude that two species including the one found widely here, Petrobius brevistylis, are European aliens. The claim is that these could not plausibly have just floated here, so likely came in on sailing ships that traded on this coast for the last few hundred years, on ballast that they then dumped — sea shore rocks (our bristletail's normal habitat, plus littoral cliffs). This idea apparently came earlier in a book by Carl Lindroth (1957, not 1967) who seems not to have been convinced of continental drift. He was looking for explanations for how similar/identical insects could exist on both sides of the Atlantic: the ballast rock idea obviously might work in the case of wingless apterygotes. Presumably it could be supported (or not) now by RNA identity analysis from P. brevistylis on both sides of the pond. Steve (Hfx) On Nov 21, 2016, at 7:08 PM, Hebda, Andrew J <Andrew.Hebda@novascotia.ca> wrote: > The Deermouse Peromyscus maniculatus. This population as studied by Mark Pulsifer in 1981. It has possibly been isolated from the mainland populations by 7,500 years, and differs from its mainland counterpaerts in its size (significantly larger than mainland) populations, and behaviour.. more aggressive that those on the mainland. > > There is a Curatorial Report on our 4 day expedition in 1997 at https://ojs.library.dal.ca/NSM/article/view/3905 with some details. > > Andrew > > A Hebda > NSM Collections (Zoology) > > ________________________________________ > From: naturens-owner@chebucto.ns.ca [naturens-owner@chebucto.ns.ca] on behalf of Ronald Arsenault [rongarsenault@gmail.com] > Sent: November-21-16 6:57 PM > To: naturens@chebucto.ns.ca > Subject: Re: [NatureNS] Isle Haute CBC interview Bill Casey > > Richard, > > What is the unique small mammal? > > On Mon, Nov 21, 2016 at 6:14 PM, Richard Stern <sternrichard@gmail.com<mailto:sternrichard@gmail.com>> wrote: > I went there and camped one weekend in July 3 years ago. Not the best time for birding, but interesting nevertheless. We only saw a few common birds such as Redstarts, B-C chickadees etc. but also Peregrines and Bald eagles that we suspected were nesting. We didn't see or hear any signs of Leach's storm petrels, but that doesn't mean they weren't there. There are people in the biology dept. at Acadia who have done studies there, and they would have the greatest knowledge. Dan Conlan, who is with one of the museums in Halifax (and might be on this list - I don't know) knows as much as anyone, if not more, and might have more to add. However, it's a neat place with a lot of native and other history, interesting geology, and certainly at least one unique small mammal and probably some unique plant life. on the principle that the more land that can be conserved the better, I would support its conservation. > > Richard > > On Mon, Nov 21, 2016 at 5:36 PM, Ken McKenna <kenmcken54@eastlink.ca<mailto:kenmcken54@eastlink.ca>> wrote: > > Hi all > Just listening to Bill Casey interview on CBC and my ears perked up at a couple of things he said. First it is home to 300 species of birds. Surely this is a political exaggeration. He also stated that the Leach's Storm-Petrel is endangered or something to that effect. In fact, Birdlife International has it in the category of least concern. > Regardless it would be nice to have the isle preserved. I know some people in this forum have been there so maybe a comment or two about it might be interesting. > Cheers > Ken > > Sent from my iPad > > Sent from my iPad > > > > > > -- > ################# > Dr.R.B.Stern, > P.O. Box 300, > Port Williams, > N.S., Canada, > B0P 1T0 > Richard Stern, > Port Williams, NS, Canada > sternrichard@gmail.com<mailto:sternrichard@gmail.com> > ################### > > > > -- > Ronald G. Arsenault > Halifax, Nova Scotia
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