Table 3. Total seasonal photo-identification effort for adult common dolphins (Delphinus sp.) between 2010 and 2013 in the Hauraki Gulf, New Zealand (Individuals identified are the number of unique animals first sighted per season, whereas D1 and D2 represents the number of distinctive animals per category (D1 and D2) sighted and re-sighted per season).

Abbreviations: Hours (h), summer (S), autumn (A), winter (W), and spring (Sp.). Survey duration refers to the total time on the water per survey (including time spent during encounters and searching for dolphins). Encounter duration refers to the total time during photo-id sessions with groups of dolphins. Search duration refers to the total time searching for dolphins where no photo-id sessions occurred.

Year	2010				2011				2012				2013					Total
Season	S	A	W	Sp.	S	A	W	Sp.	S	A	W	Sp.	S	A	W	Sp.	S
Survey duration (h)	123.8	59.2	75.1	66.8	46.4	58.8	108.8	204.9	223.3	155.6	220.0	133.8	283.0	230.0	223.5	227.6	77.3	2,518
Encounter duration (h)	9.1	4.3	8.9	3.2	2.0	5.0	11.1	35.0	27.5	32.7	46.4	35.8	74.0	50.6	65.0	90.9	18.7	520
Search duration (h)	114.7	54.9	66.2	63.6	44.4	53.8	97.7	169.9	195.8	122.9	173.6	98	209	179.4	158.5	136.7	58.6	1,998
Photo-id surveys (d)	15	8	10	8	6	7	14	35	39	32	40	28	40	46	44	31	16	419
Groups encountered	23	13	24	25	8	12	50	128	83	102	145	101	166	123	163	191	54	1,411
Sightings	35	15	58	32	13	18	49	217	171	223	286	169	493	355	421	717	150	3,422
Individuals identified	33	13	58	30	11	18	45	182	110	141	180	106	258	181	240	405	72	2,083
D1	17	6	33	27	25	14	31	135	111	120	139	88	309	198	219	410	91	1,973
D2	14	7	24	18	4	4	18	78	55	93	140	81	173	149	196	293	58	1,405