next message in archive
next message in thread
previous message in archive
previous message in thread
Index of Subjects
Birds from a This is a multipart message in MIME format. ------=_NextPart_000_0020_01D525A0.AC3D6F00 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Yup, we sure present migratory birds (and a lot of other species) with a bewildering number of challenges, as we reduce the challenges ma nature throws our way. Gonna be interesting to see how it ends, but I hope I get to do without that level of excitement. We do have an ethical obligation as a species to do what we can to do unto them as we would have nature do unto us. What goes around comes around. Anyway, I'm preaching to the converted. Makes me think of a conversation I had with a coupla guys about ten days ago. I was waiting for my number to be called and was talking about the work our group (Tusket River Environmental Protection Association) is doing to protect some rare lakeside plant species in the catchment. The question I got was, "What good are they?" I appreciate that question. It tells me we still have an enormous amount of public education to do, if we want a critical mass of the public to support some of the worthy initiatives we espouse. From: naturens-owner@chebucto.ns.ca [mailto:naturens-owner@chebucto.ns.ca] On Behalf Of John Kearney Sent: June 17, 2019 9:40 PM To: naturens@chebucto.ns.ca Subject: [NatureNS] Bird Habitats Hi All, Most birds in Nova Scotia are migratory and thus occupy four different kinds of habitat over the course of a year; breeding habitat, aerial habitat, stopover habitat, and winter habitat. Birds are subject to increasing levels of human-induced mortality in all of these habitats. Mortality in breeding habitats is particularly worrisome since it can involve the death of all the young of local populations as in the case of clearcutting. The relationship between local and regional populations is not well understood or documented. There is scientific evidence that adult forest birds show fidelity to a breeding site while yearling birds disperse. We don't know how resilient these adult birds are to landscape changes when they return in the next breeding season, and if there is a threshold of change at which resilience is no longer possible. Since a great part of our migratory birds are neotropical migrants, they spend a very large part of the year flying to and then flying back from Mexico, and Central and South America. One has only to look at a satellite photo of North America at night to see how this aerial habitat is highly polluted by lights which disorient migrants, causing death by exhaustion or from collision into wind turbines, gas flares, and urban buildings. Birds from all types of breeding habitats are represented in this aerial habitat and the piles of dead birds collected in a morning on a city block represent birds of the fields, forests, and wetlands. During this voyage, the Nova Scotia birds must come down in the morning to refuel. As they get further from Nova Scotia, the availability of habitat similar to their breeding habitat may decline or refueling for long-distance flight might require quite a different diet than one for nourishing nestlings, and hence quite a different type of habitat. At the Mount Auburn Cemetery in the middle of the city of Boston, one will find hundreds of forest birds in the ornamental trees surrounding the groomed lawns and quiet pools of the large cemetery. In these stop-over habitats birds may be particularly vulnerable to predation by cats and other predators, like the Peregrine, that specialize in hunting in open areas like cities and coastal thickets. Birds spend the winter in habitats that are under increasing levels of destruction and disturbance through the growth of coffee plantations, other types of deforestation, mining, tourism, and urbanization. Mortality in these winter areas is not well understood but appears to be very substantial for some species. Finally, on top of all these threats to birds, is climate change which drastically affects all four of their habitats. Conservation efforts are required on a very broad front, and habitat preservation and restoration are a continent-wide problem affecting the survival of Nova Scotia's birds. John ------=_NextPart_000_0020_01D525A0.AC3D6F00 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable <html xmlns:v=3D"urn:schemas-microsoft-com:vml" = xmlns:o=3D"urn:schemas-microsoft-com:office:office" = xmlns:w=3D"urn:schemas-microsoft-com:office:word" = xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" = xmlns=3D"http://www.w3.org/TR/REC-html40"><head><meta = http-equiv=3DContent-Type content=3D"text/html; = charset=3Dus-ascii"><meta name=3DGenerator content=3D"Microsoft Word 14 = (filtered medium)"><style><!-- /* Font Definitions */ @font-face {font-family:Calibri; panose-1:2 15 5 2 2 2 4 3 2 4;} @font-face {font-family:Tahoma; panose-1:2 11 6 4 3 5 4 4 2 4;} @font-face {font-family:"Comic Sans MS"; panose-1:3 15 7 2 3 3 2 2 2 4;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {margin:0cm; margin-bottom:.0001pt; font-size:10.0pt; font-family:"Comic Sans MS"; mso-fareast-language:EN-US;} a:link, span.MsoHyperlink {mso-style-priority:99; color:blue; text-decoration:underline;} a:visited, span.MsoHyperlinkFollowed {mso-style-priority:99; color:purple; text-decoration:underline;} span.EmailStyle17 {mso-style-type:personal; font-family:"Calibri","sans-serif"; color:windowtext;} span.EmailStyle18 {mso-style-type:personal-reply; font-family:"Calibri","sans-serif"; color:#1F497D;} .MsoChpDefault {mso-style-type:export-only; font-size:10.0pt;} @page WordSection1 {size:612.0pt 792.0pt; margin:72.0pt 72.0pt 72.0pt 72.0pt;} div.WordSection1 {page:WordSection1;} --></style><!--[if gte mso 9]><xml> <o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" /> </xml><![endif]--><!--[if gte mso 9]><xml> <o:shapelayout v:ext=3D"edit"> <o:idmap v:ext=3D"edit" data=3D"1" /> </o:shapelayout></xml><![endif]--></head><body lang=3DEN-CA link=3Dblue = vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span = style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497= D'>Yup, we sure present migratory birds (and a lot of other species) = with a bewildering number of challenges, as we reduce the challenges ma = nature throws our way. Gonna be interesting to see how it ends, = but I hope I get to do without that level of excitement. We do = have an ethical obligation as a species to do what we can to do unto = them as we would have nature do unto us. What goes around comes = around.<o:p></o:p></span></p><p class=3DMsoNormal><span = style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497= D'><o:p> </o:p></span></p><p class=3DMsoNormal><span = style=3D'font-size:11.0pt;font-family:"Calibri","sa