BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Marin Audubon Society - ECPv6.15.18//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Marin Audubon Society
X-ORIGINAL-URL:https://marinaudubon.org
X-WR-CALDESC:Events for Marin Audubon Society
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:America/Los_Angeles
BEGIN:DAYLIGHT
TZOFFSETFROM:-0800
TZOFFSETTO:-0700
TZNAME:PDT
DTSTART:20200308T100000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0700
TZOFFSETTO:-0800
TZNAME:PST
DTSTART:20201101T090000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:-0800
TZOFFSETTO:-0700
TZNAME:PDT
DTSTART:20210314T100000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0700
TZOFFSETTO:-0800
TZNAME:PST
DTSTART:20211107T090000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:-0800
TZOFFSETTO:-0700
TZNAME:PDT
DTSTART:20220313T100000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0700
TZOFFSETTO:-0800
TZNAME:PST
DTSTART:20221106T090000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20210211T193000
DTEND;TZID=America/Los_Angeles:20210211T213000
DTSTAMP:20260406T031709
CREATED:20210105T035537Z
LAST-MODIFIED:20210203T100708Z
UID:10000125-1613071800-1613079000@marinaudubon.org
SUMMARY:Marin’s Booming Bird Populations: Three-quarters of a Century of Avifaunal Expansion
DESCRIPTION:Speaker: Roger Harris\nHost: Doug Waterman\nDate: February 11\, 2021\nStart time: 7:30 PM\nEnd time: 9:30 PM\nPlease sign up HERE \nMany of our common Marin County birds\, whose abundance we now take for granted\, were rare or absent only three-quarters of a century ago. Since the beginning of the Southern Marin Christmas Bird County in the 1970s\, for instance\, Red-shouldered Hawk detections have increased tenfold. Habitat restoration and maturation\, conservation efforts\, and cultural changes in the behavior of individual bird species have all contributed to shifting – and\, for Marin\, generally increasing – bird populations.  \nSnowy Egrets\, Great Egrets\, and Great Blue Herons\, which had been extirpated from the Bay Area\, returned in the mid-twentieth century.  Black-necked Stilts were first recorded nesting in our marshes in the mid-1960s\, followed by American Avocets in 1984.  In 1996\, Forster’s Terns nested in Corte Madera Shorebird Marsh for the first time in Marin County. \nThe dean of California ornithology\, Joseph Grinnell\, wrote in 1915 that the Ridgway’s Rail “seems destined to early extinction.”  The rail is the logo bird of the Marin Audubon Society and conservation advocacy efforts have made Grinnell’s prediction of a century ago at least premature. \nOur speaker\, Roger Harris\, will unpack the evolving dynamics of avifaunal population change using data from Christmas Bird Counts\, the Marin County Breeding Bird Atlas\, and a variety of other sources. Roger is a Certified Wildlife Biologist and a longtime member of the Marin Audubon Society. Once the pandemic resolves\, he hopes to return to leading international eco-tours for the Oceanic Society. \nPhoto courtesy of Roger Harris
URL:https://marinaudubon.org/event/marins-booming-bird-populations-three-quarters-of-a-century-of-avifaunal-expansion/
LOCATION:Zoom Event\, CA\, United States
CATEGORIES:Speaker Series
ATTACH;FMTTYPE=image/jpeg:https://marinaudubon.org/wp-content/uploads/2021/01/Red-shouldered-Hawk-Copy-e1609790092859.jpg
END:VEVENT
END:VCALENDAR