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Wehkamp, Stephanie; Fischer, Philipp (2013): Crustaceans and fish abundances and species at and around artificially introduced tetrapod fields in the southern North Sea, 2010-2011. PANGAEA,, Supplement to: Wehkamp, S; Fischer, P (2013): Impact of coastal defence structures (tetrapods) on a demersal hard-bottom fish community in the southern North Sea. Marine Environmental Research, 83, 82-92,

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In the coming decades, artificial defence structures will increase in importance worldwide for the protection of coasts against the impacts of global warming. However, the ecological effects of such structures on the natural surroundings remain unclear. We investigated the impact of experimentally introduced tetrapod fields on the demersal fish community in a hard-bottom area in the southern North Sea. The results indicated a significant decrease in fish abundance in the surrounding area caused by migration effects towards the artificial structures. Diversity (HB) and evenness (E) values exhibited greater variation after the introduction of the tetrapods. Additionally, a distinct increase in young-of-the-year (YOY) fish was observed near the structures within the second year after introduction. We suggest that the availability of adequate refuges in combination with additional food resources provided by the artificial structures has a highly species-specific attraction effect. However, these findings also demonstrate that our knowledge regarding the impact of artificial structures on temperate fish communities is still too limited to truly understand the ecological processes that are initiated by the introduction of artificial structures. Long-term investigations and additional experimental in situ work worldwide will be indispensable for a full understanding of the mechanisms by which coastal defence structures interact with the coastal environment.
Related to:
Wehkamp, Stephanie; Fischer, Philipp (2013): The impact of coastal defence structures (tetrapods) on decapod crustaceans in the southern North Sea. Marine Environmental Research, 92, 52-60,
Median Latitude: 54.193067 * Median Longitude: 7.878327 * South-bound Latitude: 54.192530 * West-bound Longitude: 7.877530 * North-bound Latitude: 54.193700 * East-bound Longitude: 7.879000
Date/Time Start: 2010-03-25T12:00:00 * Date/Time End: 2011-11-14T12:00:00
Helgoland_TMI * Latitude: 54.192970 * Longitude: 7.878450 * Location: German Bight, North Sea * Campaign: Helgoland * Basis: Meeresstation Helgoland * Device: Sampling by diver (DIVER)
Helgoland_TN * Latitude: 54.193700 * Longitude: 7.877530 * Location: German Bight, North Sea * Campaign: Helgoland * Basis: Meeresstation Helgoland * Device: Sampling by diver (DIVER)
Helgoland_TS * Latitude: 54.192530 * Longitude: 7.879000 * Location: German Bight, North Sea * Campaign: Helgoland * Basis: Meeresstation Helgoland * Device: Sampling by diver (DIVER)
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
3Latitude of eventLatitude
4Longitude of eventLongitude
5Sample code/labelSample labelWehkamp, Stephaniecounting
6DirectionDirectiondegWehkamp, Stephanie
7DistanceDistancemWehkamp, Stephanie
8Temperature, waterTemp°CWehkamp, Stephanie
9VisibilityVisibmWehkamp, Stephanie
10TideTideWehkamp, Stephanie
11LaminariaLaminaria#Wehkamp, Stephanie0=0-4, 1=5-9, 2=>10
12CommentCommentWehkamp, Stephanie
13Gadus morhuaG. morhua#Wehkamp, Stephanie
14Trisopterus luscusT. luscus#Wehkamp, Stephanie
15Pollachius pollachiusP. pollachius#Wehkamp, Stephanie
16Pollachius virensP. virens#Wehkamp, Stephanie
17Raniceps raninusR. raninus#Wehkamp, Stephanie
18Ciliata mustelaC. mustela#Wehkamp, Stephanie
19Spinachia spinachiaS. spinachia#Wehkamp, Stephanie
20Entelurus aequoreusE. aequoreus#Wehkamp, Stephanie
21Nerophis ophidionN. ophidion#Wehkamp, Stephanie
22Myoxocephalus scorpiusM. scorpius#Wehkamp, Stephanie
23Taurulus bubalisT. bubalis#Wehkamp, Stephanie
24Agonus cataphractusA. cataphractus#Wehkamp, Stephanie
25Callionymus lyraC. lyra#Wehkamp, Stephanie
26Cyclopterus lumpusC. lumpus#Wehkamp, Stephanie
27Liparis spp.Liparis spp.#Wehkamp, Stephanie
28Trachurus trachurusT. trachurus#Wehkamp, Stephanie
29Labrus bergyltaL. bergylta#Wehkamp, Stephanie
30Ctenolabrus rupestrisC. rupestris#Wehkamp, Stephanie
31Zoarces viviparusZ. viviparus#Wehkamp, Stephanie
32Pholis gunnellusP. gunnellus#Wehkamp, Stephanie
33Pomatoschistus flavescensP. flavescens#Wehkamp, Stephanie
34Pomatoschistus minutusP. minutus#Wehkamp, Stephanie
35PleuronectidaePleuronectidae#Wehkamp, Stephanie
36Fish larvaeFish larv#Wehkamp, Stephanie
37Homarus gammarusH. gammarus#Wehkamp, Stephanie
38Pilumnus hirtellusP. hirtellus#Wehkamp, Stephanie
39Pisidia longicornisP. longicornis#Wehkamp, Stephanie
40Hyas araneusH. araneus#Wehkamp, Stephanie
41Galathea squamiferaG. squamifera#Wehkamp, Stephanie
42Pagurus bernhardusP. bernhardus#Wehkamp, Stephanie
43Cancer pagurusC. pagurus#Wehkamp, Stephanie
44Carcinus maenasC. maenas#Wehkamp, Stephanie
45Liocarcinus spp.Liocarcinus spp.#Wehkamp, Stephanie
46Necora puberN. puber#Wehkamp, Stephanie
47Gadus morhuaG. morhua#Wehkamp, Stephanieyoung of the year
48Pollachius pollachius, juvenileP. pollachius juv#Wehkamp, Stephanie
49Myoxocephalus scorpiusM. scorpius#Wehkamp, Stephanieyoung of the year
50Taurulus bubalisT. bubalis#Wehkamp, Stephanieyoung of the year
51Callionymus lyraC. lyra#Wehkamp, Stephanieyoung of the year
52Agonus cataphractusA. cataphractus#Wehkamp, Stephanieyoung of the year
53Ctenolabrus rupestrisC. rupestris#Wehkamp, Stephanieyoung of the year
54Zoarces viviparusZ. viviparus#Wehkamp, Stephanieyoung of the year
55Pholis gunnellusP. gunnellus#Wehkamp, Stephanieyoung of the year
48393 data points

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