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<a href="../201403/3 --089e0153873e57126004f46889e9 Content-Type: text/plain; charset=ISO-8859-1 The species wide definition makes sense in differentiating, thanks again. If you will indulge me here's a further question - is migration learned behavior or evolutionary instinct - nurture or nature? Regards Jamie On 11 March 2014 15:28, Laviolette, Lance (EXP) <lance.laviolette@lmco.com>wrote: > Jamie asked: > > *>*If birds go south in the fall and return north in the spring on a > regular basis aren't they migrating and not irrupting? > > > > In the sense that migrating is the periodic movement from one region to > another yes it is. However as Randy wrote I think that we usually apply > migrating to an event that takes place on a species wide basis and on an > annual basis. Using the term irruption implies to me that it isn't > necessarily an annual event and that a variable number of the species > engage in it. So for me, the northern species of owls 'irrupt' south > periodically while Yellow Warblers migrate south to Central and South > America annually (or more appropriately, Yellow Warblers migrate north > where they spend 4-5 months breeding). > > > > Also, migration isn't always restricted to a north-south movement, even in > Nova Scotia. Local movements around the province or even concentrations at > certain food sources have been brought up in discussions before on > NatureNS. These qualify as migration under the above definition. There are > also longer, west to east movements that for example, result in ducks, > grebes, loons, etc. wintering off of Nova Scotia's coasts. > > > > All the best, > > > > Lance > -- Jamie Simpson Hantsport, NS --089e0153873e57126004f46889e9 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr">The species wide definition makes sense in differentiating= , thanks again.<div><br></div><div>If you will indulge me here's a furt= her question - is migration learned behavior or evolutionary instinct - nur= ture or nature?</div> <div><br></div><div>Regards</div><div><br></div><div>Jamie</div></div><div = class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On 11 March 2014 1= 5:28, Laviolette, Lance (EXP) <span dir=3D"ltr"><<a href=3D"mailto:lance= .laviolette@lmco.com" target=3D"_blank">lance.laviolette@lmco.com</a>></= span> wrote:<br> <blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p= x #ccc solid;padding-left:1ex"><div lang=3D"EN-US" link=3D"blue" vlink=3D"p= urple"><div><p class=3D"MsoNormal"><span style=3D"font-family:"Cambria= ","serif";color:#1f497d">Jamie asked:<u></u><u></u></span></= p> <div class=3D""><div><div><p class=3D"MsoNormal"><b><span style=3D"font-fam= ily:"Cambria","serif";color:#1f497d">></span></b><sp= an style=3D"font-family:"Cambria","serif"">If birds go = south in the fall and return north in the spring on a regular basis aren= 9;t they migrating and not irrupting?</span><span style=3D"font-family:&quo= t;Cambria","serif""><u></u><u></u></span></p> </div></div></div><div><div><p class=3D"MsoNormal"><span style=3D"font-size= :11.0pt;font-family:"Calibri","sans-serif";color:#1f497= d"><u></u> <u></u></span></p><p class=3D"MsoNormal"><span style=3D"fon= t-family:"Cambria","serif";color:#1f497d">In the sense = that migrating is the periodic movement from one region to another yes it i= s. However as Randy wrote I think that we usually apply migrating to an eve= nt that takes place on a species wide basis and on an annual basis. Using t= he term irruption implies to me that it isn’t necessarily an annual e= vent and that a variable number of the species engage in it. So for me, the= northern species of owls ‘irrupt’ south periodically while Yel= low Warblers migrate south to Central and South America annually (or more a= ppropriately, Yellow Warblers migrate north where they spend 4-5 months bre= eding).<u></u><u></u></span></p> <p class=3D"MsoNormal"><span style=3D"font-family:"Cambria","= ;serif";color:#1f497d"><u></u> <u></u></span></p><p class=3D"MsoN= ormal"><span style=3D"font-family:"Cambria","serif";col= or:#1f497d">Also, migration isn’t always restricted to a north-south = movement, even in Nova Scotia. Local movements around the province or even = concentrations at certain food sources have been brought up in discussions = before on NatureNS. These qualify as migration under the above definition. = There are also longer, west to east movements that for example, result in d= ucks, grebes, loons, etc. wintering off of Nova Scotia’s coasts.<u></= u><u></u></span></p> <p class=3D"MsoNormal"><span style=3D"font-family:"Cambria","= ;serif";color:#1f497d"><u></u> <u></u></span></p><p class=3D"MsoN= ormal"><span style=3D"font-family:"Cambria","serif";col= or:#1f497d">All the best,<span class=3D"HOEnZb"><font color=3D"#888888"><u>= </u><u></u></font></span></span></p> <span class=3D"HOEnZb"><font color=3D"#888888"><p class=3D"MsoNormal"><span= style=3D"font-family:"Cambria","serif";color:#1f497d">= <u></u> <u></u></span></p><p class=3D"MsoNormal"><span style=3D"font-f= amily:"Cambria","serif";color:#1f497d">Lance<u></u><u><= /u></span></p> </font></span></div></div></div></div></blockquote></div><br><br clear=3D"a= ll"><div><br></div>-- <br><div dir=3D"ltr"><div>Jamie Simpson<br></div>Hant= sport, NS<br></div> </div> --089e0153873e57126004f46889e9--