Pehlke, Constanze; Bartsch, Inka (2023): Occurrence and cover of algae along a transect at the island of Helgoland in 2005 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.962213, In: Pehlke, C; Bartsch, I (2023): Depth distribution and biomass of sublittoral seaweeds at the island of Helgoland in 2005 [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.962211
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Abstract:
A sublittoral transect (P3) in the North of Helgoland that had been investigated ~40 years earlier by Lüning (1970) was traversed again. Scuba dives were carried out between 21.04.2005 and 23.06.2005. At different sampling points (Location ID: P1-P44; start with P1 every new day) along the transect, substrate and topography was recorded and every 5m occurrence and the cover was obtained of the dominant brown algae Fucus serratus, Sargassum muticum, Laminaria digitata, L. hyperborea and Saccharina latissima. The occurrence was measured qualitatively as present/absence (1/0) and the cover was estimated semi-quantitative according to the Kautsky scale as 0 for not present to 100 as 100% cover (Kautsky, 1995). Furthermore, the transect was split into different zones (1-7) depending on the algal vegetation according to the master thesis of C. Gehling (2006). For each sampling point, time, date and coordinates were given as well as the corrected depth in m mean low water spring tide.
Keyword(s):
Related to:
Gehling, Constanze (2006): Qualitative und quantitative Analyse des Laminarienwaldes vor Helgoland - ein Vergleich zu 1970. University of Bremen, Bremen, Germany, Gehling_2006.pdf
Lüning, K (1970): Tauchuntersuchungen zur Vertikalverteilung der sublitoralen
Helgoländer Algenvegetation. 21(3), 271-291, https://doi.org/10.1007/BF01609062
Pehlke, Constanze; Bartsch, Inka (2008): Changes in depth distribution and biomass of sublittoral seaweeds at Helgoland (North Sea) between 1970 and 2005. Climate Research, 37, 135-147, https://doi.org/10.3354/cr00767
Documentation:
Coverage:
Median Latitude: 54.194779 * Median Longitude: 7.860800 * South-bound Latitude: 54.189583 * West-bound Longitude: 7.850817 * North-bound Latitude: 54.202183 * East-bound Longitude: 7.868017
Date/Time Start: 2005-04-21T13:50:00 * Date/Time End: 2005-06-23T14:05:00
Minimum DEPTH, water: -0.89 m * Maximum DEPTH, water: 13.58 m
Comment:
Gehling (2006) figure 3 shows the sampling location as black dots.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DATE/TIME | Date/Time | Pehlke, Constanze | Geocode | ||
| 2 | Number | n | # | Pehlke, Constanze | ||
| 3 | Location ID | Loc ID | Pehlke, Constanze | |||
| 4 | LATITUDE | Latitude | Pehlke, Constanze | Geocode | ||
| 5 | LONGITUDE | Longitude | Pehlke, Constanze | Geocode | ||
| 6 | DEPTH, water | Depth water | m | Pehlke, Constanze | Geocode – corrected depth below MLWS (mean low water spring tide) | |
| 7 | Substrate type | Substrate | Pehlke, Constanze | Buntsandstein (red sandstone) (BSS), Muschelkies (mussel gravel) (MK), Kreide (chalk), Granit (granite), Muschelkalk (limestone) | ||
| 8 | Topography | Topo | Pehlke, Constanze | |||
| 9 | Sargassum muticum | S. muticum | Pehlke, Constanze | presence/absence (0: absent, 1: present) | ||
| 10 | Sargassum muticum, cover | S. muticum cov | % | Pehlke, Constanze | Estimated according to Kautsky (1995) | percentages refer to: 100 = 91-100 %, 75 = 61-90 %, 50 = 41-60 %, 25 = 11-40 %, 5 = 1-10 %, 0 = 0 % |
| 11 | Fucus serratus | F. serratus | Pehlke, Constanze | presence/absence (0: absent, 1: present) | ||
| 12 | Fucus serratus, cover | F. serratus cov | % | Pehlke, Constanze | Estimated according to Kautsky (1995) | percentages refer to: 100 = 91-100 %, 75 = 61-90 %, 50 = 41-60 %, 25 = 11-40 %, 5 = 1-10 %, 0 = 0 % |
| 13 | Laminaria digitata | L. digitata | Pehlke, Constanze | presence/absence (0: absent, 1: present) | ||
| 14 | Laminaria digitata, cover | L. digitata cov | % | Pehlke, Constanze | Estimated according to Kautsky (1995) | percentages refer to: 100 = 91-100 %, 75 = 61-90 %, 50 = 41-60 %, 25 = 11-40 %, 5 = 1-10 %, 0 = 0 % |
| 15 | Saccharina latissima | S. latissima | Pehlke, Constanze | presence/absence (0: absent, 1: present) | ||
| 16 | Saccharina latissima, cover | S. latissima cov | % | Pehlke, Constanze | Estimated according to Kautsky (1995) | percentages refer to: 100 = 91-100 %, 75 = 61-90 %, 50 = 41-60 %, 25 = 11-40 %, 5 = 1-10 %, 0 = 0 % |
| 17 | Laminaria hyperborea | L. hyperborea | Pehlke, Constanze | presence/absence (0: absent, 1: present) | ||
| 18 | Laminaria hyperborea, cover | L. hyperborea cov | % | Pehlke, Constanze | Estimated according to Kautsky (1995) | percentages refer to: 100 = 91-100 %, 75 = 61-90 %, 50 = 41-60 %, 25 = 11-40 %, 5 = 1-10 %, 0 = 0 % |
| 19 | Zone | Zone | Pehlke, Constanze | based on Figure 3 in Gehling (2006) | ||
| 20 | Comment | Comment | Pehlke, Constanze |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 3 (ProcLevel3)
Size:
4011 data points
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