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Index of Subjects --Apple-Mail-1--436720953 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed No idea, but it sounds like a bit of an odd question. Are you trying to tie it to bird abundance or migratory period, the timing of which might be more rigidly (and unfavorably) fixed for bird migration than for insect emergence if the climate warms up, as I recall some have speculated? As herbivors, you'd expect caterpillars to be dependent upon when their special food plant(s) starts to sprout, which is presumably variable for different species plus weather-dependent. For arboreal caterpillars, there are no (or few) leaves on deciduous trees around here (Halifax) until about the third week in May, but in Washington DC (etc) when we lived there, much further south, things started to warm up in March; same or earlier in Vancouver. As well, certain species have more than one generation per year. A way to check at least for butterflies in NS would be via the on- line nicely revamped Butterflies of NS site, which besides images gives the empirical flight period data actually observed for each species, but also the inferred egg-laying and larval timing. Though apparently not usually measured directly, the latter may be quite accurate because the flight period of the adult is usually quite short, so the eggs obviously have to be laid before the end of that. You'd have to go through it species by species and compile an average histogram by week, if that's what you're after. Don't know how you'd do it for the much larger number of moths, but Jim Edsall or others might have some sources. Steve (Halifax) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ On 23-Aug-13, at 3:42 PM, James Churchill wrote: > or roughly June and August for Canada? > cheers, > James. > > On Fri, Aug 23, 2013 at 3:25 PM, James Churchill > <jameslchurchill@gmail.com> wrote: > hi folks, > > Can anyone provide information on the temporal distribution of > caterpillar abundance in NS or North America? > > Do we by chance have two peak periods of caterpillar abundance > corresponding roughly to May and September? > > cheers, > James. > > -- > James Churchill > Kentville, Nova Scotia > jameslchurchill@gmail.com > (902) 681-2374 > --Apple-Mail-1--436720953 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=US-ASCII <html><body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; = -webkit-line-break: after-white-space; ">No idea, but it sounds like a = bit of an odd question. Are you trying to tie it to bird abundance = or migratory period, the timing of which might be more rigidly (and = unfavorably) fixed for bird migration than for insect emergence if the = climate warms up, as I recall some have speculated? = <div><br></div><div>As herbivors, you'd expect caterpillars = to be dependent upon when their special food plant(s) starts to sprout, = which is presumably variable for different species plus = weather-dependent. For arboreal caterpillars, there are no (or = few) leaves on deciduous trees around here (Halifax) until about the = third week in May, but in Washington DC (etc) when we lived there, = much further south, things started to warm up in March; same or = earlier in Vancouver. As well, certain species have more than one = generation per year. <div><br></div><div>A way to check at least = for butterflies in NS would be via the on-line nicely revamped = Butterflies of NS site, which besides images gives the empirical flight = period data actually observed for each species, but also the inferred = egg-laying and larval timing. Though apparently not usually = measured directly, the latter may be quite accurate because the flight = period of the adult is usually quite short, so the eggs obviously have = to be laid before the end of that. You'd have to go through it = species by species and compile an average histogram by week, if that's = what you're after. </div><div>Don't know how you'd do it for = the much larger number of moths, but Jim Edsall or others might have = some sources.</div><div>Steve = (Halifax)</div><div> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</div><div= ><br></div><div><div><div>On 23-Aug-13, at 3:42 PM, James Churchill = wrote:</div><br class=3D"Apple-interchange-newline"><blockquote = type=3D"cite"><div dir=3D"ltr">or roughly June and August for = Canada?<div>cheers, </div><div>James. </div></div><div = class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Fri, Aug 23, = 2013 at 3:25 PM, James Churchill <span dir=3D"ltr"><<a = href=3D"mailto:jameslchurchill@gmail.com" = target=3D"_blank">jameslchurchill@gmail.com</a>></span> wrote:<br> = <blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 = .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr">hi = folks, <div><br></div><div>Can anyone provide information on the = temporal distribution of caterpillar abundance in NS or North = America?<div> <div><br></div><div>Do we by chance have two peak periods = of caterpillar abundance corresponding roughly to May and = September?</div> <div><br></div><div>cheers, </div><span = class=3D"HOEnZb"><font = color=3D"#888888"><div>James.</div></font></span></div></div></div></block= quote></div></div></blockquote><blockquote type=3D"cite"><div = class=3D"gmail_extra"><div><br></div>-- <br><div dir=3D"ltr">James = Churchill<br>Kentville, Nova Scotia<br><a = href=3D"mailto:jameslchurchill@gmail.com" = target=3D"_blank">jameslchurchill@gmail.com</a><br>(902) = 681-2374<br><font class=3D"Apple-style-span" color=3D"#000000"><font = class=3D"Apple-style-span" = color=3D"#0000DD"><br></font></font></div></div></blockquote></div> = <br></div></div></body></html>= --Apple-Mail-1--436720953--
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