PAHawkowl

Journal Analysis

grantstevenson44@yahoo.com — Sun, 21 Dec 2008 23:34:51 GMT

I analyzed my first four years, 1991-5, of my Grinnell journal, and got n= 21 birding trips, and arithmetic mean of 1.08 individuals/spps.; r= -0.998; Spearman Rank Test, r= -0.52, p= 0.05; cv= 31.5%, low.

ABSTRACT

grantstevenson44@yahoo.com — Wed, 03 Dec 2008 01:29:57 GMT

tHE lEHIGH vALLEY AND VICINITY IS A STOPOVER FOR MIGRATING RAPTORS WHICH FEED ON SMALL TO MID-SIZED MAMMALS AND BIRDS AT FEEDERS. BECAUSE OF THE KITTATINNY rIDGE. eVERYTHING FROM GOSHAWK TO VULTURES TO gOLDEN eAGLES WERE OBSERVED AT MY FOLK'S PLACE WHERE i SET UP A PLATFORM FEEDER WITH PLENTY OF COVER. ALSO OBSERVATIONS WERE MADE ALONG THE LEHIGH RIVER. BIRDS PREFERRED LIGHT WINDS AND RED-TAILS ON AVERAGE WERE SEEN DAILY AT 0.92 H PER DAY. OVER 46 DAYS, 233 RAPTORS OF 13 SPECIES PLUS 2 UNIDENTIFIED BUTEOSAND 1 UNID RAPTOR WERE SEEN MIGRATING, N= 87, /X=M5.1, SE+/- 1.1. THE POISON DISTRIBUTION OF PROBABILITIES OF SPECIES, RTH= 0.51, ARE AS FOLLOWS

1	0.03
2	0.07
3	0.51
4	0.07
5	0.17
6	0.15
7	0.11
8	0.07
9	0.04
10	0.02

FROM 1997-8, GRINNELL JOURNAL RESULTS

grantstevenson44@yahoo.com — Wed, 03 Dec 2008 01:00:19 GMT

N= 21 TRIPS BIRDING, MEAN= 1.1 INDIVIDUALS PER SPECIES, SE +/- O.74, R2= 0.998, CV= 31.5%, R= 0.52, P= 0.05: GRAPH= AS SPECIES RICHNESS INCREASED, NO. OF INDIVS. DECLINED.

Dr. John A. Wiens on Competition, Scarcity, abundance, and Plenty

grantstevenson44@yahoo.com — Wed, 26 Nov 2008 16:29:40 GMT

From www.scienceblogs.com/grrlscientist and BIRDCHAT: Tittle 17, US Code, Copy Write Law may apply.

Examining grassland species with graduate student Mr. J.T. Rotenberry, Dr. John A. Wiens, avian community ecologist, found that in periods of abundance of food, species did not compete for resources, while in cases of scarcity, they did. applied to feeders in winter, dominant species and individuals win battles for feeder perches by asserting their alpha statuses. Larger species do not always dominate. In 17 out of 48 cases- 35.4%- Black Vultures supplanted TV's at carcusses* (Stewart 1978). Dominant immature ravens suppressed subordinants by "yelling"(Heinrich & Marzluff 1991).

* r= -0.46, p= 0.05

Heinrich, B., & J.M. Marzluff. 1991. DO COMMON RAVENS YELL BECAUSE THEY WANT TO ATTRACT OTHERS? Behav. Ecol. Soc. Biol. 28: 13-21.

Stewart, P.A. 1978. BEHAVIORAL INTERACTIONS AND NICHE SEPARATION IN BLACK AND TURKEY VULTURES. Living Bird 17: 79-84.

bethlehem crow winter roost 2007-8

grantstevenson44@yahoo.com — Sun, 05 Oct 2008 20:25:29 GMT

crows totaled about 2850, high count, n= 13, /x= 21.8, SD+/- 7.4

cv= 33.7%

rally display of roost pre-night, with some flying over at night in the lit sky,

elaboration

grantstevenson44@yahoo.com — Sun, 05 Oct 2008 11:07:02 GMT

red-tails use same environs as cooper's hawks...shade trees, mature woods, deciduous, open fields, lawns, suburbs

turnover in red-tails, lehigh valley

grantstevenson44@yahoo.com — Sun, 05 Oct 2008 11:02:11 GMT

1.1, jolley-seber method, from 1991-2002, 4 pairs, 1 mortality...binomial test, p<0.0001.

Diet-- Lehigh Valley Red-tailed Hawks

grantstevenson44@yahoo.com — Sun, 05 Oct 2008 10:58:19 GMT

Red-tails seem to be distributed among mature trees with Gray Squirrels, Sciurus carolinensis, according to Dr. Dan Klem, Jr., Sarkis Acopian Professor of Ornithology and Conservation Biology, Muhlenberg College, Allentown. Also, chipmunk, baby marmot, rabbit, robin have been seen once predated against. a male and female was seen 'teaming up' on a baby marmot with its parents chasing it into a hole.

no fax anymore

grantstevenson44@yahoo.com — Sun, 28 Sep 2008 18:18:01 GMT

the afore said fax no. is no longer active

Evidence of Post Dispersal Pairs in Blue Jays

grantstevenson44@yahoo.com — Sun, 28 Sep 2008 18:14:05 GMT

The Evidence of Post-dispersal foraging territories in Blue Jays (Cyansitta cristata)in a suburban backyard in early Sept. 4 indivs.= two territorial pairs anti-phonal singing toward each other...
9/2 9/3 9/6 9/7 2006
8:41am 4

11:04am 4

1:48pm 2

2:34pm 2 4

4:46pm 2

6:23pm 4

7:26pm 1

email

grantstevenson44@yahoo.com — Sat, 06 Sep 2008 11:41:51 GMT

grantstevenson44@yahoo.com...more studies coming up!

Updated Personal Information

grantstevenson44@yahoo.com — Tue, 25 Dec 2007 05:24:08 GMT

Grant Stevenson
Open Space Consultants
946 Seneca Street, Suite 11
Bethlehem, PA 18015 U.S.A.
Tel 610-867-2862
fax 610-841-4000, call first
em pahawkowl@yahoo.com
alt. em pahawkowl@verizon.net
URL http://pahawkowl.livejournal.com
http://verizon.net/surnia_ulula_caparoch

Sharpie "Bouts" at a Northern Appalacian September Hawkwatch

grantstevenson44@yahoo.com — Tue, 25 Dec 2007 05:15:21 GMT

I counted groups of 2-5 sharpies migrating past Bake Oven Knob Hawkwatch in a late Sept. weekend day four 4-5 hours. Counted every 3-5 mins., if I got a goose egg, it went toward the average. For that Time/Space Scale at BOK, the average was 2.5 individual migrants. We also saw a flock of Rusty Blackbirds among some grackles, plus a substantial flock of ravens.

grantstevenson44@yahoo.com — Sun, 23 Dec 2007 01:02:24 GMT

Sharp-shinned Hawks seem as numerous in suburban Lehigh Valley as Cooper's Hawks because of feeders, no doubt. They better watch out for the windows!!

grant

Campus Red-tailed Hawks in the Lehigh Valley, Pennsylvania, USA: Diet

grantstevenson44@yahoo.com — Sat, 22 Dec 2007 01:02:46 GMT

Eastern Chipmunk, Gray Squirrel, American Robin, and baby Ground Hog (unsuccessfully- parents following at top speed during the chase).

Wood Thrush and Fragment Use in the Suburban Parkland

grantstevenson44@yahoo.com — Sat, 22 Dec 2007 00:56:30 GMT

Censusing small, medium, and large suburban park wooded fragments, I did one of the most simplest and efficient ways to express center and spread in statistics by figuring out the median (m) and doing a quantile analysis, in this case, a quartile analysis. One must always express a spread as well as a center to demonstrate the way the data is distributed, but even sometimes professionals overlook this. Sense you cannot do standard deviation or standard error of a median, I will post later what is know as an ICR: with the data. I used not the n, but a log index of n. Haila et al (1993) used the Poisson Distribution to "predict" the outcome in a Finnish archipelago of fragments in the southern taiga. I found that Wood Thrush occupied the middle two quartiles the most, though inside the fragment as opposed to the edge. Cornell Lab's Birds of Forested Landscape program found that area-sensitive songbirds like Scarlet Tanager and forest thrushes need a radius of at least 300 yards to reproduce, which may indicate that none of my singing males were productive, but floaters (Lowe pers. com.). I censused about 8 fragments. More samples are needed. A distribution like Poisson or Normal Distribution then possibly could be utilized to better confirmed statistical power and calculate a more true median.

Fatal Light Awareness Program (FLAP)

grantstevenson44@yahoo.com — Tue, 13 Feb 2007 15:04:49 GMT

In Allentown, PA, PPL Tower looms large above the skyline. Around it while living there I found: 2 Turkey Vultures, 1 Red-tailed Hawk, 1 Black and White Warbler, 4 Hooded Warblers, 1 Canada Warbler, and 1 Summer Tanager, plus a Wood Thrush that hit the glass and was dazed. At night, 8 Common Nighthawks, a dead Ovenbird, and no doubt others.

New Direction

grantstevenson44@yahoo.com — Thu, 16 Nov 2006 20:16:49 GMT

I'm going to send the "natural experiment" and a field note on robin foraging on lawns to regional journals, meanwhile working with Live Journal to regain the length of my posting capabilities here. Contact:

GRANT STEVENSON
Open Space Consultants
946 Seneca Street, Suite 11
Bethlehem, PA 18015
phn 610-867-2862
fax 610-866-6234, call first
Surnia_ulula_caparoch@verizon.net

http://mysite.verizon.net/surnia_ulula_caparoch/

Important Note to the Viewer

grantstevenson44@yahoo.com — Fri, 10 Nov 2006 03:29:38 GMT

Note: Two attempts at fully posting the previous two-page technical original field ornithology research failed and proved that I've lost the capability to post short papers on this blog. I will check with Live Journal customer service to try to rectify the problem. If they are unable, I will have to switch to my own website to replace the defunct one clickable at the bottom of this page ("Hawkowl" by Verizon).

SHORT COMMUNICATION

grantstevenson44@yahoo.com — Thu, 19 Oct 2006 23:42:08 GMT

Hooded Warbler (Wilsonia citrina) comp. BIRDCHAT. Recently seen on migration in the middle of Jersey City.

A NATURAL EXPERIMENT SHORT-TERM ON THE EFFECT OF HABITAT ALTERATION ON BIRDS

Ferruginous and Swainson's Hawk Statuses Disputed

grantstevenson44@yahoo.com — Mon, 09 Oct 2006 23:59:47 GMT

Ferruginous Hawks (Buteo regalis) are not listed in the US, but are on the Audubon Watchlist, listed as Near Threatened and almost Threatened by the IUCN, and are considered Conservation Dependent by the Global Raptor Information Network. Swainson's Hawks are on both the PIF and Audubon Watchlists, and are recommended for management by the 2004 PIF North American Landbird Conservation Plan. Question about ferrugs has been raised since the early '90's. eBird has them down as Rare. Will the real statuses stand up? My headstaff ferrug photo was taken in Texas complements BIRDCHAT. Shows their ability to utilize roadside telephone poles. This should help to count them in the BBS, a road survey, and prove their non-alarming counts correct.

Otus asio asio

grantstevenson44@yahoo.com — Mon, 09 Oct 2006 21:12:42 GMT

The nominal race of Eastern Screech Owl (O.a.asio) has not had its diet examined through nest box contents and sighted takes even though this subspecies was NOT the one primarily studied so far (O.a. hasbrouckii). Thus a different physiographic area's prey was studies. I hope to do this, and maybe study caching in this species possible effect on egg weight.

Patterned Vagrancy Caused by Availability of Resources

grantstevenson44@yahoo.com — Mon, 09 Oct 2006 20:58:03 GMT

Photo by Geoff Malosh as posted on PABIRDS Pennsylvania/Audubon Society birding listserv. Purple Gallinule (Porphyrula martinica), juvenile, due to juvenile, post-dispersal, wandering and vagrancy. As climate changes, resources determining habitat selection like food, cover, water, song perches, potential density of food and game, simple plant successions, succession in bird life history, amount of edge, topographic and plant successions, geological successions, land-use changes, life zones and forest types, etc., change, sometimes dramatically over time. A few vagrant does not necessarily indicate the effects of climate change, but could. As they accumulate, as in PA in Summer Tanagers, Blue Grosbeaks, and Mississippi Kites, or vagrants of different species from the south consistently landing here, it seems to point to climate change as one plausible explanation. Purple Gallinules are mostly from Central and South America.

Records

grantstevenson44@yahoo.com — Sat, 07 Oct 2006 10:40:33 GMT

Pallas's Warbler in AK- North American record, September 30, 2006. But how do the records get to Gambell (www.ebird.org/content/news/Gambell2006.html)? Hobbies, Pallas's Buntings, Siberian Rubythroats, etc.

grantstevenson44@yahoo.com — Sat, 30 Sep 2006 02:00:57 GMT

We had a visitor in the form of this Bullock's Oriole (Icterus bullockii) in Bethlehem in the backyard of Steve Wolf and his lovely wife from Dec.-April 2005-6. It was a Northampton County record. PABIRDS lit up with its news. Now, as I write, the record is being reviewed by PORC, the PA Ornithological Records Committee. I consulted a paper by Sievert Rowher and Jo Manning, showed the photos to Sievert and hybrid specialist Jim Rising, and concluded it was a imm. male or adult female pure Bullock's.