BUCR CBC Analysis

Christmas Bird Count Data for Loggerhead Shrike from Tennessee, Mississippi, and Alabama, 1992-2002

Some data relating to Loggerhead Shrikes (Lanius ludovicianus) on Christmas Bird Counts in Tennessee, Mississippi, and Alabama are presented below. Data were selected from CBCs for which data were available for all years, 1992-2002, in the national CBC database.

An analysis of the data below was published in the following source:

            Stedman, S. J., and M. R. Allen. 2003. Decadal Decline (1992-2002) of Loggerhead
                Shrikes on Christmas Bird Counts in Alabama, Mississippi, and Tennessee.
                Alabama Birdlife 49 (2): 1-6.

CBC codes are explained below; PH = Party Hours of Effort.

CBC Code	Location

TNBR	Buffalo River (Lawrence County), Tennessee
TNCH	Chattanooga, Tennessee
TNCL	Clarksville, Tennessee
TNCO	Columbia, Tennessee
TNCV	Cookeville, Tennessee
TNEL	Elizabethton, Tennessee
TNGS	Great Smoky Mountains National Park, Tennessee
TNHI	Hiwassee, Tennessee
TNHP	Hickory-Priest (East of Nashville), Tennessee
TNME	Memphis, Tennessee
TNNA	Nashville, Tennessee
TNNL	Nickajack Lake (Near Chattanooga), Tennessee
TNRL	Reelfoot Lake, Tennessee
TNRM	Roan Mountain, Tennessee
TNSA	Savannah, Tennessee


MSAL	Arkabutla Lake, Mississippi
MSGR	Grenada, Mississippi
MSJA	Jackson, Mississippi
MSJC	Jackson County, Mississippi
MSML	Moon Lake, Mississippi
MSNO	Noxubee NWR (Near Starkville), Mississippi
MSSH	Southern Hancock County, Mississippi
MSSI	Sidon, Mississippi
MSSL	Sardis Lake, Mississippi
MSVI	Vicksburg, Mississippi
MSWC	Washington County (South), Mississippi


ALBI	Birmingham, Alabama
ALDI	Dauphin Island, Alabama
ALEU	Eufaula NWR, Alabama
ALFM	Fort Morgan, Alabama
ALGS	Gulf Shores, Alabama
ALGU	Guntersville, Alabama
ALMO	Montgomery, Alabama
ALMT	Mobile-Tensaw Delta, Alabama
ALTU	Tuscaloosa, Alabama
ALWA	Waterloo, Alabama
ALWH	Wheeler NWR, Alabama

Table 1. Numbers of Loggerhead Shrikes Recorded on Christmas Bird Counts in Tennessee, Mississippi, and Alabama, 1992-2002.

CBC	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001	2002
Code


TNBR	45	7	30	12	15	6	28	13	15	11	16
TNCH	3	1	1	0	0	0	1	0	0	0	1
TNCL	11	4	3	4	0	5	3	1	0	1	2
TNCO	8	9	8	7	7	7	6	4	2	2	6
TNCV	5	2	4	5	1	0	2	1	6	0	2
TNEL	0	0	0	0	1	0	0	0	1	0	0
TNGS	1	0	0	0	0	0	0	0	0	0	0
TNHI	10	4	1	4	5	5	4	4	2	3	1
TNHP	6	1	1	1	2	1	0	0	0	0	0
TNME	14	23	11	10	7	3	4	16	3	3	5
TNNA	14	7	11	9	5	8	2	10	2	4	0
TNNL	3	4	8	2	2	2	0	1	0	1	4
TNRL	19	16	16	23	8	10	7	20	20	26	18
TNRM	0	0	0	0	0	0	0	0	0	0	0
TNSA	5	0	3	4	0	2	0	2	0	1	1

TN Total	144	78	97	81	53	49	57	72	51	52	56
PH Total	860.5	851.25	954.25	944	833	915.25	833.5	839	770.75	888.15	869.25
LOSH/PH	0.167	0.092	0.102	0.086	0.064	0.054	0.068	0.086	0.066	0.059	0.064



CBC	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001	2002
Code



MSAL	24	21	13	11	29	20	22	14	17	10	10
MSGR	11	8	5	3	8	2	5	3	6	3	34
MSJA	41	29	36	20	33	26	28	30	11	28	19
MSJC	19	36	19	12	32	20	6	8	1	13	22
MSML	14	17	11	16	4	5	15	24	12	17	16
MSNO	15	13	9	7	4	10	6	6	14	9	5
MSSH	47	28	47	39	19	30	18	28	27	31	26
MSSI	34	32	15	12	15	25	4	7	35	6	32
MSSL	7	8	10	7	6	7	7	4	1	5	2
MSVI	40	33	38	47	44	32	56	44	24	33	43
MSWC	31	37	47	39	55	60	44	46	25	28	37

MS	283	262	250	213	249	237	211	214	173	183	246
PH Total	611.75	620.75	646.5	573.75	625.25	610	540.25	571.75	603	601	655.25
LOSH/PH	0.463	0.422	0.387	0.371	0.398	0.389	0.391	0.374	0.287	0.304	0.375



CBC	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001	2002
Code



ALBI	14	9	8	6	9	6	6	5	14	5	9
ALDI	18	6	22	6	23	4	9	7	7	14	13
ALEU	6	5	4	5	9	6	5	11	4	5	5
ALFM	15	27	31	19	22	3	1	7	9	9	3
ALGS	137	116	123	99	116	66	48	91	44	81	81
ALGU	25	20	16	9	12	16	15	7	15	11	13
ALMO	46	43	26	24	27	28	18	51	23	41	25
ALMT	13	16	8	10	8	4	5	8	5	3	9
ALTU	18	24	11	15	10	11	17	7	3	7	2
ALWA	8	6	6	8	7	1	4	7	4	9	6
ALWH	14	16	13	6	6	11	7	6	6	10	7

AL	314	288	268	207	249	156	135	207	134	195	173
PH Total	857.25	833	822.25	740.75	894	798.5	712.5	783.5	776.75	794.5	803
LOSH/PH	0.366	0.346	0.326	0.279	0.279	0.195	0.189	0.264	0.173	0.245	0.215

TN Total	144	78	97	81	53	49	57	72	51	52	56
MS Total	283	262	250	213	249	237	211	214	173	183	246
AL Total	314	288	268	207	249	156	135	207	134	195	173

Total LOSH	741	628	615	501	551	442	403	493	358	430	475
Total PH TNMSAL	2329.5	2305	2423	2258.5	2352.25	2323.75	2086.25	2194.25	2150.5	2283.65	2327.5
LOSH/ PH	0.318	0.272	0.254	0.222	0.234	0.190	0.193	0.225	0.166	0.188	0.204



CBC	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001	2002

Here are some Breeding Bird Survey data taken during the same years as when the CBC data were taken. Data from BBS routes were included for all routes that were run during all years of the period from 1992 to 2002.

BBS Code	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001	2002

82001	0	0	0	0	0	0	0	0	0	0	1
82002	1	2	1	4	1	0	0	3	2	0	2
82003	0	1	0	0	0	4	0	0	0	0	0
82006	3	3	2	0	0	0	1	1	0	0	0
82009	0	0	0	0	0	0	0	0	0	0	0
82010	0	0	0	0	0	0	0	0	0	0	0
82016	0	1	0	0	0	0	0	0	0	0	0
82018	2	0	0	0	0	0	0	1	0	0	0
82020	0	0	0	0	2	0	0	0	0	0	0
82022	2	4	1	3	0	1	1	0	0	1	0
82023	0	1	0	0	1	0	0	0	2	1	2
82024	2	3	0	0	4	0	0	5	0	0	0
82025	0	0	0	0	0	0	0	0	0	0	0
82026	4	0	1	0	1	0	0	0	0	0	0
82027	1	3	0	1	0	0	1	1	0	1	1
82029	0	0	0	0	0	0	0	0	0	0	0
82031	0	0	0	0	0	0	0	0	0	0	0
82032	0	0	0	0	0	4	0	0	0	0	0
82033	0	1	0	0	0	0	0	0	0	0	0
82034	0	0	0	0	0	0	0	0	0	0	0
82042	0	0	0	0	0	0	0	0	0	0	0
82128	0	0	0	0	0	0	0	0	0	0	0
82139	0	0	0	0	0	0	0	0	0	0	0

TN Total	15	19	5	8	8	9	3	11	4	3	6

51009	0	0	0	0	1	1	0	0	0	0	0
51015	2	2	0	3	3	1	3	5	2	1	1
51030	0	0	1	0	0	0	0	0	0	0	0
51101	0	0	0	0	0	0	0	0	0	0	0

MS Total	2	2	1	3	4	2	3	5	2	1	1

02007	2	0	1	0	0	0	2	0	0	0	1
02010	0	1	0	0	2	0	0	0	0	0	0
02014	1	5	0	0	0	1	0	0	0	0	2
02017	0	1	0	0	0	0	0	0	0	0	0
02019	1	0	0	1	1	0	0	0	0	0	0
02022	5	3	3	0	1	2	1	1	2	0	2
02026	0	0	0	4	1	1	1	3	1	1	8
02027	0	2	0	0	1	0	3	0	1	0	1
02028	0	0	0	0	0	0	0	0	0	0	1
02029	0	5	1	0	1	2	0	0	1	0	0
02033	0	0	5	3	0	0	0	1	0	8	6
02034	0	1	1	2	0	2	0	0	0	1	0
02038	0	2	0	0	0	0	0	1	0	0	1
02039	0	0	0	1	1	0	0	0	1	0	2
02041	3	0	0	0	0	0	0	0	1	0	0
02043	0	0	0	0	0	0	0	0	0	0	0
02045	0	0	0	2	0	0	0	0	0	0	0
02047	0	0	0	0	0	0	0	0	0	0	0
02050	4	0	0	2	0	1	0	3	1	2	2
02053	0	0	0	0	0	0	0	0	0	0	0
02140	11	1	2	7	3	7	2	2	5	2	2

AL Total	27	21	13	21	11	16	9	11	13	14	28

TN Total	15	19	5	8	8	9	3	11	4	3	6
MS Total	2	2	1	3	4	2	3	5	2	1	1
AL Total	27	21	13	21	11	16	9	11	13	14	28

Grand Total	44	42	19	32	23	27	15	27	19	18	35

Acknowledgments:

Ginger K. Ensor (Tennessee Technological University) assisted in the compilation of the above CBC data, which derive from the CBC database maintained by the Cornell Laboratory of Ornithology and the National Audubon Society. The BBS data were extracted from the raw data files maintained by the USGS.

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