Citation:

BfG-1996

Name: Harbour seal counts in the Elbe Estuary, Germany, between Wedel and Cuxhaven in 2018/2019
Creator: Bundesanstalt für Gewässerkunde
Published: 2019-10-21
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Aerial survey; Elbe Estuary; Harbour Seal; Phoca vitulina; Seal count

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Abstract:

Aerial surveys were conducted in the Elbe Estuary, Germany, to count harbour seals on their haul-out sites. Haul-out sites were located within the intertidal zone, usually close to the waterway or tidal creeks. The north-western border of the study area was located at river-km 728 (city of Cuxhaven) and the south-eastern border was located at river-km 632 (Mühlenberger Loch). Flights were performed monthly from August 2018 until July 2019 (12 flights in total) at low tide. Within each month, a flight date in the middle of the month was chosen, depending on the tide and weather conditions. Flights were performed with a twin-engined aircraft at a height of approximately 600 feet and at an average speed of 100 knots. The flight routes were tracked via GPS. Sighted harbour seals were photographed on their haul-out sites and the corresponding geographic position was recorded. In the office, the photos were used to count the animals. In the beginning of the pupping season in June, adult and juvenile individuals were counted separately. The sizes of individual seals were used to distinguish between both age classes. Later in the year, juvenile seals could no longer visually be distinguished from adult individuals due to the pups' rapid growth. Consequently, count data of juvenile harbour seals are only available for June 2019.

Keyword(s):

Aerial survey; Elbe Estuary; Harbour Seal; Phoca vitulina; Seal count

Coverage:

Median Latitude: 53.877242 * Median Longitude: 8.950455 * South-bound Latitude: 53.545690 * West-bound Longitude: 8.738340 * North-bound Latitude: 54.012030 * East-bound Longitude: 9.806500

Date/Time Start: 2018-08-15T00:00:00 * Date/Time End: 2019-07-12T00:00:00

Event(s):

Elbe_Estuary * Latitude Start: 53.545690 * Longitude Start: 9.799440 * Latitude End: 54.012030 * Longitude End: 8.756120 * Date/Time Start: 2018-08-15T00:00:00 * Date/Time End: 2019-07-12T00:00:00 * Method/Device: Aircraft (AC)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	DATE/TIME	Date/Time		Taupp, Thomas	Geocode
2	LONGITUDE	Longitude		Taupp, Thomas	Geocode
3	LATITUDE	Latitude		Taupp, Thomas	Geocode
4	Phoca vitulina, adult	P. vitulina ad	#	Taupp, Thomas
5	Phoca vitulina, juvenil	P. vitulina juv	#	Taupp, Thomas

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Size:

451 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Date/Time	2 Longitude	3 Latitude	4 P. vitulina ad [#]	5 P. vitulina juv [#]
2018-08-20	9.00546	53.86766	1
2018-08-20	8.96027	53.85687	2
2018-08-20	8.95587	53.85614	44
2018-08-20	8.95139	53.85554	7
2018-08-20	8.87564	53.85620	34
2018-08-20	8.86811	53.85861	1
2018-08-20	8.79629	53.85069	18
2018-08-20	8.79413	53.85090	8
2018-08-20	8.79200	53.85112	3
2018-08-20	8.74701	53.88886	24
2018-08-20	8.77973	53.91626	3
2018-08-20	8.78220	53.91684	2
2018-08-20	8.82621	53.93457	9
2018-08-20	8.91066	53.89238	1
2018-08-20	8.87657	53.88740	15
2018-08-20	8.87384	53.88936	5
2018-08-20	8.87099	53.89798	34
2018-08-20	8.83125	53.91186	1
2018-08-20	8.81417	53.92457	3
2018-08-20	8.82131	53.94738	18
2018-08-20	8.81788	53.94866	2
2018-08-20	8.79544	53.95339	18
2018-08-20	8.77454	53.95791	2
2018-08-20	8.77237	53.95791	1
2018-08-15	9.00415	53.84586	8
2018-08-15	9.01267	53.84588	3
2018-08-15	9.37127	53.80121	8
2018-08-15	9.49028	53.70087	5
2018-09-15	8.95354	53.85846	21
2018-09-15	8.87489	53.85743	16
2018-09-15	8.79333	53.85208	29
2018-09-15	8.75282	53.88996	21
2018-09-15	8.83728	53.93856	7
2018-09-15	8.87131	53.89736	15
2018-09-15	8.80288	53.95263	3
2018-09-15	8.77295	53.95695	18
2018-09-15	8.74443	53.95306	3
2018-09-15	8.74763	53.97482	1
2018-09-15	9.00119	53.84346	5
2018-09-15	9.25362	53.86837	3
2018-09-15	9.37192	53.80157	7
2018-09-15	9.80461	53.54764	2
2018-09-15	9.53585	53.66763	7
2018-10-14	8.94145	53.85798	13
2018-10-14	8.87640	53.85725	17
2018-10-14	8.79308	53.85232	17
2018-10-14	8.77788	53.85440	1
2018-10-14	8.74900	53.89189	5
2018-10-14	8.83567	53.93444	8
2018-10-14	8.87676	53.89536	14
2018-10-14	8.79627	53.95388	2
2018-10-14	8.77132	53.95703	12
2018-10-14	8.76636	53.95723	9
2018-10-14	9.00802	53.84929	5
2018-10-14	9.24911	53.86646	16
2018-10-14	9.36516	53.80940	0
2018-10-14	9.36617	53.80799	0
2018-10-14	9.36795	53.80505	4
2018-10-14	9.53356	53.66214	1
2018-10-14	9.53268	53.66384	1
2018-11-15	8.94321	53.85592	22
2018-11-15	8.87861	53.85833	5
2018-11-15	8.87616	53.85801	34
2018-11-15	8.85251	53.86453	12
2018-11-15	8.85050	53.86562	5
2018-11-15	8.80829	53.92433	1
2018-11-15	8.83013	53.93538	14
2018-11-15	8.87045	53.89852	15
2018-11-15	8.87230	53.90126	9
2018-11-15	8.80241	53.95274	1
2018-11-15	8.78104	53.95289	4
2018-11-15	8.77312	53.95339	6
2018-11-15	8.77033	53.95366	5
2018-11-15	8.76190	53.95448	7
2018-11-15	8.75250	53.92206	12
2018-11-15	8.78625	53.85914	13
2018-11-15	9.00660	53.84747	5
2018-11-15	9.24984	53.86949	17
2018-11-15	9.25182	53.86908	5
2018-11-15	9.36780	53.80247	17
2018-11-15	9.79944	53.54569	3
2018-12-12	8.94884	53.85790	9
2018-12-12	8.94626	53.85743	5
2018-12-12	8.86934	53.89691	11
2018-12-12	8.87002	53.89820	10
2018-12-12	8.87191	53.90062	18
2018-12-12	8.87191	53.90062	14
2018-12-12	8.90933	53.88777	2
2018-12-12	8.82342	53.95321	1
2018-12-12	8.78533	53.95806	5
2018-12-12	8.77271	53.95860	2
2018-12-12	8.79775	53.92096	3
2018-12-12	8.84996	53.86348	4
2018-12-12	8.84661	53.86786	10
2018-12-12	8.86979	53.86461	5
2018-12-12	8.87150	53.86371	11
2018-12-12	8.87150	53.86371	3
2018-12-12	9.00506	53.84809	2
2018-12-12	9.01349	53.84103	2
2018-12-12	9.36672	53.80479	9
2018-12-12	9.36728	53.80346	19
2018-12-12	9.53302	53.66821	8
2018-12-12	9.53302	53.66821	1
2018-12-12	9.48796	53.70117	3
2019-01-10	8.95169	53.85670	11
2019-01-10	8.94721	53.85586	3
2019-01-10	8.88105	53.85481	11
2019-01-10	8.84951	53.86519	9
2019-01-10	8.79498	53.84955	4
2019-01-10	8.75417	53.89030	8
2019-01-10	8.73834	53.91950	2
2019-01-10	8.73834	53.91950	7
2019-01-10	8.82977	53.93543	5
2019-01-10	8.90976	53.89270	1
2019-01-10	8.87019	53.89644	1
2019-01-10	8.87206	53.90015	34
2019-01-10	8.87206	53.90015	3
2019-01-10	8.85987	53.90427	1
2019-01-10	8.85710	53.90229	1
2019-01-10	8.78117	53.95478	17
2019-01-10	8.77681	53.95587	5
2019-01-10	8.77022	53.95727	21
2019-01-10	8.74855	53.95637	4
2019-01-10	9.00021	53.84402	5
2019-01-10	8.75612	54.01203	15
2019-01-10	9.36812	53.80410	22
2019-01-10	9.48614	53.70055	4
2019-01-10	9.80405	53.55275	1
2019-01-10	9.54090	53.67248	6
2019-02-12	8.94592	53.85876	12
2019-02-12	8.94130	53.85786	2
2019-02-12	8.79563	53.95723	6
2019-02-12	8.74166	53.92598	2
2019-02-12	8.76046	53.90476	2
2019-02-12	8.76574	53.89873	8
2019-02-12	8.79149	53.85140	1
2019-02-12	8.84859	53.87663	5
2019-02-12	8.86580	53.87215	1
2019-02-12	8.87155	53.87054	7
2019-02-12	8.87155	53.87054	15
2019-02-12	8.87436	53.86972	8
2019-02-12	8.87436	53.86972	1
2019-02-12	9.02126	53.84344	1
2019-02-12	9.01055	53.83962	2
2019-02-12	9.22377	53.87030	5
2019-02-12	9.25122	53.86923	13
2019-02-12	9.25122	53.86923	10
2019-02-12	9.25122	53.86923	14
2019-02-12	9.36994	53.80331	3
2019-02-12	9.36994	53.80331	13
2019-03-19	8.95221	53.85837	9
2019-03-19	8.94377	53.85725	4
2019-03-19	8.94377	53.85725	6
2019-03-19	8.89496	53.88742	1
2019-03-19	8.89702	53.88966	1
2019-03-19	8.87324	53.90008	15
2019-03-19	8.87419	53.90116	7
2019-03-19	8.87524	53.90214	8
2019-03-19	8.84226	53.92759	3
2019-03-19	8.78683	53.96298	1
2019-03-19	8.82679	53.95381	1
2019-03-19	8.79338	53.95890	1
2019-03-19	8.78614	53.85861	5
2019-03-19	8.87554	53.85592	17
2019-03-19	8.87554	53.85592	2
2019-03-19	8.85623	53.86494	9
2019-03-19	8.85056	53.86719	2
2019-03-19	9.22837	53.87039	2
2019-03-19	9.24547	53.86801	1
2019-03-19	9.24839	53.86728	1
2019-03-19	9.25128	53.86655	2
2019-03-19	9.25416	53.86580	2
2019-03-19	9.32113	53.83932	1
2019-03-19	9.36288	53.80985	1
2019-03-19	9.36610	53.80404	8
2019-03-19	9.36610	53.80404	7
2019-03-19	9.36679	53.80258	4
2019-03-19	9.36679	53.80258	3
2019-03-19	9.36679	53.80258	5
2019-03-19	9.68915	53.55365	6
2019-03-19	9.80635	53.54721	2
2019-03-19	9.54729	53.67111	4
2019-03-19	9.54648	53.66987	7
2019-04-17	8.87250	53.90000	15
2019-04-17	8.78790	53.91500	2
2019-04-17	8.74500	53.95401	15
2019-04-17	8.79660	53.85370	1
2019-04-17	9.00600	53.84150	1
2019-04-17	9.33670	53.80450	14
2019-04-17	9.68930	53.55355	3
2019-04-17	9.80650	53.54743	5
2019-04-17	9.54523	53.65217	1
2019-04-17	9.54328	53.65975	11
2019-05-16	8.79305	53.95349	10
2019-05-16	8.78387	53.95525	5
2019-05-16	8.78387	53.95525	2
2019-05-16	8.78387	53.95525	1
2019-05-16	8.75430	53.91792	3
2019-05-16	8.78863	53.85820	4
2019-05-16	8.84771	53.87502	1
2019-05-16	8.84771	53.87502	4
2019-05-16	9.23888	53.86985	1
2019-05-16	9.36876	53.80466	4
2019-05-16	9.48543	53.70201	1
2019-05-16	9.68844	53.55492	8
2019-05-16	9.68844	53.55492	21
2019-06-14	8.95064	53.85856	6	3
2019-06-14	8.94643	53.85762	1	1
2019-06-14	8.94424	53.85719	1	1
2019-06-14	8.94199	53.85687	1	1
2019-06-14	8.94199	53.85687	5	1
2019-06-14	8.89768	53.87127	1	0
2019-06-14	8.86803	53.89768	4	3
2019-06-14	8.86803	53.89768	4	3
2019-06-14	8.86803	53.89768	4	3
2019-06-14	8.86803	53.89768	6	6
2019-06-14	8.86940	53.89897	2	2
2019-06-14	8.86940	53.89897	15	11
2019-06-14	8.86940	53.89897	8	3
2019-06-14	8.87075	53.90030	3	0
2019-06-14	8.87213	53.90163	5	3
2019-06-14	8.91036	53.90069	2	1
2019-06-14	8.90908	53.89581	2	2
2019-06-14	8.90835	53.89468	1	1
2019-06-14	8.90678	53.89240	4	2
2019-06-14	8.87339	53.89463	1	1
2019-06-14	8.87131	53.89747	13	5
2019-06-14	8.87131	53.89747	1	1
2019-06-14	8.87105	53.89901	4	3
2019-06-14	8.87133	53.90056	3	3
2019-06-14	8.87133	53.90056	5	1
2019-06-14	8.87217	53.90204	4	2
2019-06-14	8.87217	53.90204	3	2
2019-06-14	8.87217	53.90204	3	1
2019-06-14	8.87348	53.90337	2	0
2019-06-14	8.86455	53.89118	2	2
2019-06-14	8.86455	53.89118	1	0
2019-06-14	8.83425	53.93259	1	0
2019-06-14	8.83425	53.93259	8	1
2019-06-14	8.84138	53.93296	3	3
2019-06-14	8.84764	53.93148	1	1
2019-06-14	8.85771	53.92281	1	1
2019-06-14	8.85927	53.92038	3	2
2019-06-14	8.83161	53.95212	1	1
2019-06-14	8.83129	53.94680	12	6
2019-06-14	8.83129	53.94680	6	3
2019-06-14	8.82672	53.94791	2	0
2019-06-14	8.82672	53.94791	8	7
2019-06-14	8.82440	53.94836	1	1
2019-06-14	8.82202	53.94860	3	2
2019-06-14	8.82202	53.94860	1	2
2019-06-14	8.81964	53.94866	3	3
2019-06-14	8.80775	53.95051	2	0
2019-06-14	8.80541	53.95111	4	2
2019-06-14	8.80310	53.95163	1	1
2019-06-14	8.80310	53.95163	3	1
2019-06-14	8.80310	53.95163	9	5
2019-06-14	8.80082	53.95218	4	3
2019-06-14	8.79640	53.95351	5	5
2019-06-14	8.79640	53.95351	12	9
2019-06-14	8.79436	53.95439	1	1
2019-06-14	8.79436	53.95439	14	11
2019-06-14	8.79436	53.95439	4	2
2019-06-14	8.79247	53.95542	5	5
2019-06-14	8.79247	53.95542	6	3
2019-06-14	8.79247	53.95542	5	5
2019-06-14	8.79247	53.95542	3	2
2019-06-14	8.79247	53.95542	4	3
2019-06-14	8.79247	53.95542	1	0
2019-06-14	8.79247	53.95542	1	1
2019-06-14	8.79067	53.95650	2	0
2019-06-14	8.79067	53.95650	3	1
2019-06-14	8.78692	53.95843	5	2
2019-06-14	8.78692	53.95843	4	2
2019-06-14	8.78490	53.95918	2	1
2019-06-14	8.78490	53.95918	4	4
2019-06-14	8.77833	53.96070	2	3
2019-06-14	8.77833	53.96070	4	2
2019-06-14	8.77833	53.96070	5	4
2019-06-14	8.77833	53.96070	5	2
2019-06-14	8.77599	53.96107	2	1
2019-06-14	8.77599	53.96107	5	5
2019-06-14	8.77599	53.96107	2	2
2019-06-14	8.77361	53.96135	2	1
2019-06-14	8.77121	53.96152	3	2
2019-06-14	8.77121	53.96152	4	4
2019-06-14	8.76885	53.96156	3	2
2019-06-14	8.81923	53.92476	1	0
2019-06-14	8.83271	53.91075	1	0
2019-06-14	8.84979	53.86773	2	0
2019-06-14	8.85178	53.86865	1	1
2019-06-14	8.87082	53.86597	10	0
2019-06-14	8.87646	53.86393	1	1
2019-06-14	8.88227	53.86043	1	1
2019-06-14	9.36941	53.80292	0	1
2019-07-12	8.96694	53.86557	2
2019-07-12	8.94043	53.86001	68
2019-07-12	8.87664	53.85342	1
2019-07-12	8.87661	53.85857	1
2019-07-12	8.87661	53.85857	6
2019-07-12	8.87207	53.86114	22
2019-07-12	8.87207	53.86114	7
2019-07-12	8.87207	53.86114	5
2019-07-12	8.87207	53.86114	1
2019-07-12	8.86292	53.86524	2
2019-07-12	8.85524	53.86814	14
2019-07-12	8.81999	53.85143	2
2019-07-12	8.81071	53.85242	1
2019-07-12	8.80276	53.85319	1
2019-07-12	8.79669	53.85385	1
2019-07-12	8.79669	53.85385	1
2019-07-12	8.79669	53.85385	11
2019-07-12	8.79669	53.85385	9
2019-07-12	8.79669	53.85385	4
2019-07-12	8.79669	53.85385	1
2019-07-12	8.76921	53.85963	1
2019-07-12	8.75253	53.89485	4
2019-07-12	8.75253	53.89485	7
2019-07-12	8.78787	53.91440	1
2019-07-12	8.83881	53.93015	9
2019-07-12	8.88061	53.90336	73
2019-07-12	8.89108	53.88879	1
2019-07-12	8.87570	53.89821	28
2019-07-12	8.87448	53.89518	30
2019-07-12	8.87448	53.89518	1
2019-07-12	8.85220	53.89868	1
2019-07-12	8.83198	53.90610	3
2019-07-12	8.81950	53.93106	9
2019-07-12	8.83005	53.95529	3
2019-07-12	8.82240	53.95553	22
2019-07-12	8.80221	53.95898	6
2019-07-12	8.79594	53.96014	22
2019-07-12	8.79347	53.96031	1
2019-07-12	8.79034	53.96063	42
2019-07-12	8.78673	53.96108	8
2019-07-12	8.78011	53.95901	1
2019-07-12	8.77558	53.96220	6
2019-07-12	8.77558	53.96220	2
2019-07-12	8.77558	53.96220	24
2019-07-12	8.77558	53.96220	4
2019-07-12	8.77022	53.96237	2
2019-07-12	8.76642	53.96222	1
2019-07-12	8.92343	53.86128	1
2019-07-12	8.91321	53.86716	1
2019-07-12	8.89817	53.87575	1
2019-07-12	8.82497	53.87382	1
2019-07-12	8.86123	53.85113	1
2019-07-12	8.74612	53.95294	1
2019-07-12	9.00562	53.84168	3
2019-07-12	9.01889	53.84054	11
2019-07-12	8.98893	53.84548	1
2019-07-12	9.13250	53.87234	1
2019-07-12	9.16223	53.87196	1
2019-07-12	9.24413	53.86708	1
2019-07-12	9.26060	53.86323	2
2019-07-12	9.32095	53.83789	1
2019-07-12	9.36590	53.79774	3
2019-07-12	9.36590	53.79774	2
2019-07-12	9.69063	53.55498	5
2019-07-12	9.54130	53.67022	5
2019-07-12	8.80386	53.91092	3
2019-07-12	8.82420	53.95094	9