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Below are the 20 most recent journal entries recorded in
pahawkowl's LiveJournal:
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| Sunday, December 21st, 2008 | | 6:23 pm |
Journal Analysis
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. | | Tuesday, December 2nd, 2008 | | 8:00 pm |
ABSTRACT
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 |
| | 7:48 pm |
FROM 1997-8, GRINNELL JOURNAL RESULTS
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. | | Wednesday, November 26th, 2008 | | 10:07 am |
Dr. John A. Wiens on Competition, Scarcity, abundance, and Plenty
 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. | | Sunday, October 5th, 2008 | | 4:10 pm |
bethlehem crow winter roost 2007-8
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, | | 7:04 am |
elaboration
red-tails use same environs as cooper's hawks...shade trees, mature woods, deciduous, open fields, lawns, suburbs | | 6:59 am |
| | 6:49 am |
Diet-- Lehigh Valley Red-tailed Hawks
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. | | Sunday, September 28th, 2008 | | 2:16 pm |
| | 12:58 pm |
Evidence of Post Dispersal Pairs in Blue Jays
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 | | Saturday, September 6th, 2008 | | 7:40 am |
email
grantstevenson44@yahoo.com...more studies coming up! | | Tuesday, December 25th, 2007 | | 1:13 am |
| | 1:02 am |
Sharpie "Bouts" at a Northern Appalacian September Hawkwatch
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. | | Saturday, December 22nd, 2007 | | 8:51 pm |
 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 | | Friday, December 21st, 2007 | | 8:53 pm |
| | 8:20 pm |
Wood Thrush and Fragment Use in the Suburban Parkland
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. | | Tuesday, February 13th, 2007 | | 10:04 am |
Fatal Light Awareness Program (FLAP)
 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. | | Thursday, November 16th, 2006 | | 3:16 pm |
New Direction
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/ | | Thursday, November 9th, 2006 | | 10:29 pm |
Important Note to the Viewer
 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). | | Thursday, October 19th, 2006 | | 7:02 pm |
SHORT COMMUNICATION
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 |
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