A Quantitative Study of the Nocturnal Migration of Birds

by Jr. George H. Lowery

Table 2.—Extent of Observations and Seasonal Station Densities at Major Stations in 1948

Observation Station	Nights of observation				Hours of observation				Season density
	March	April	May	Total	March	April	May	Total
Canada
Pt. Pelee			1	1			6	6	2,500
Mexico
S. L. P.: Ebano	1			1	3			3	1,300
Tamps.: Tampico	3	3		6	20	20		40	140,300
Yuc.: Progreso		3		3		18		18	60,500
United States
Fla.: Pensacola		2	2	4		8	7	15	1,500
Winter Park		5	6	11		39	38	77	21,700
Ga.: Athens		2		2		10		10	4,000
Thomasville		1	1	2		8	8	16	4,700
Iowa: Ottumwa		5	5	10		16	28	44	134,400
Kans.: Lawrence	2	1		3	16	4		20	68,700
Ky.: Louisville		3	2	5		20	14	34	49,300
Murray		2		2		13		13	26,200
La.: Baton Rouge		3		3		15		15	11,000
Lafayette		1		1		5		5	2,800
Mansfield	1	5	4	10	2	16	22	40	22,400
New Orleans	1	1		2	5	2		7	1,900
Oak Grove		2	2	4		16	15	31	33,900
Mich.: Albion		1		1		3		3	1,100
Minn.: Hopkins			1	1			4	4	2,000
Miss.: Rosedale		1	1	2		6	8	14	12,600
Mo.: Columbia		2	1	3		8	6	14	13,100
Liberty		1	1	2		7	7	14	4,800
Okla.: Stillwater	1	2	1	4	5	11	3	19	8,400
S. Car.: Charleston	1	1	1	3	5	8	9	22	3,000
Tenn.: Knoxville		2	2	4		18	14	32	35,400
Memphis	2	3	2	7	13	20	12	45	29,700
Tex.: College Station		3	1	4		19	8	27	32,200
Rockport		1		1		4		4	6,200

Table 3.—Average Hourly Station Densities in 1948

Observation Station	March	April	May	Season
Canada
Pt. Pelee			400	400
Mexico
S. L. P.: Ebano	400			400
Tamps.: Tampico	700	6,300		3,500
Yuc.: Progreso		2,800		2,800
United States
Fla.: Pensacola		0+	200	100
Winter Park		300	200	300
Ga.: Athens		400		400
Thomasville		500	100	300
Iowa: Ottumwa		1,700	3,800	3,100
Kans.: Lawrence	4,000	1,400		3,400
Ky.: Louisville		2,000	700	1,500
Murray		2,000		2,000
La.: Baton Rouge		700		700
Lafayette		600		600
Mansfield	0	700	800	600
New Orleans	60	800		300
Oak Grove		1,400	800	1,100
Mich.: Albion		400		400
Minn.: Hopkins			500	500
Miss.: Rosedale		1,100	700	900
Mo.: Columbia		400	1,700	900
Liberty		500	200	300
Okla.: Stillwater	500	200	1,000	400
S. Car.: Charleston	200	200	0+	100
Tenn.: Knoxville		1,300	800	1,100
Memphis	300	800	900	700
Tex.: College Station		1,100	1,500	1,200
Rockport		1,600		1,600

Table 4.—Maximum Hourly Station Densities in 1948

Observation Station	March	April	May
Canada
Pt. Pelee			1,400
Mexico
S. L. P.: Ebano	600
Tamps.: Tampico	3,100	21,200
Yuc.: Progreso		11,900
United States
Fla.: Pensacola		100	700
Winter Park		2,300	1,000
Ga.: Athens		900
Thomasville		1,500	200
Iowa: Ottumwa		3,800	12,500
Kans.: Lawrence	14,500	2,200
Ky.: Louisville		5,000	1,400
Murray		3,700
La.: Baton Rouge		3,400
Lafayette		1,800
Mansfield		2,100	1,600
New Orleans	200	1,100
Oak Grove		2,700	2,500
Mich.: Albion		700
Minn.: Hopkins			1,100
Miss.: Rosedale		2,200	1,400
Mo.: Columbia		800	3,400
Liberty		800	800
Okla.: Stillwater	900	700	1,400
S. Car.: Charleston	400	600	200
Tenn.: Knoxville		5,800	1,900
Memphis	1,200	3,400	2,100
Tex.: College Station		3,400	3,100
Rockport		2,400