The harbour porpoise (Phocoena phocoena) in the central German Bight: phenology, abundance and distribution in 2002–2004

Table 3 Densities of harbour porpoises in the study area in 2002–2004

Date	Altitude (m)	g(0)	esw (m)	Density (Ind./km²)	Density CV	Area size (km²)	N	±SE
07/28/02	152	0.21	163	0.88	0.32	1,630	1,439	459
08/16/02	152	0.21	163	0.23	0.47	1,630	388	183
02/14/03	183	0.21	163	1.23	0.34	1,630	2,020	688
05/16/03	76	0.21	112	1.06	0.29	2,670	2,858	822
05/26/03	183	0.21	163	0.98	0.24	1,630	1,600	391
06/14/03	183	0.21	163	0.26	0.49	1,630	427	209
06/16/03	76	0.21	112	0.33	0.32	2,670	885	280
06/22/03	183	0.21	163	0.66	0.30	1,630	1,079	323
07/28/03	183	0.21	163	0.42	0.29	2,670	1,148	329
07/31/03	76	0.21	112	0.49	0.32	2,670	1,332	421
09/04/03	76	0.21	112	0.37	0.46	2,670	1,003	465
09/13/03	183	0.21	163	0.72	0.21	2,670	1,936	412
09/28/03	76	0.21	112	0.56	0.46	2,670	1,504	697
10/16/03	76	0.21	112	0.23	0.53	2,670	629	335
12/04/03	76	0.21	112	0.14	0.51	2,670	400	204
01/21/04	76	0.21	112	0.51	0.22	2,670	1,376	298
01/21/04	183	0.21	163	0.74	0.28	2,670	2,002	571
02/28/04	76	0.21	112	0.85	0.20	2,670	2,292	460
03/06/04	183	0.21	163	0.53	0.27	2,670	1,444	381
03/25/04	76	0.21	112	0.76	0.34	2,670	2,060	700
04/13/04	183	0.21	163	0.34	0.63	2,670	929	585
04/20/04	76	0.21	112	1.14	0.21	2,670	3,075	644
04/26/04	76	0.21	112	1.54	0.31	2,670	4,126	1,267
05/29/04	183	0.21	163	0.43	0.34	2,670	1,164	402
06/22/04	76	0.21	112	0.78	0.34	2,670	2,095	715
07/16/04	76	0.21	112	0.37	0.25	2,670	999	254

g(0) Probability of detection at distance = 0 from the transect-line, esw effective strip half-width, CV coefficient of variation, N estimated number of animals present in the study area, ±SE standard error

ISSN: 1438-3888