{"refrec":{"BRefID":256889,"RR":"<b>Coolen, J.; Bos, O.; Glorius, S.; Lengkeek, W.; Cuperus, J.; van der Weide, B.; Agüera, A.</b> (2015). Reefs, sand and reef-like sand: a comparison of the benthic biodiversity of habitats in the Dutch Borkum Reef Grounds. <i>J. Sea Res. 103</i>: 84-92. <a href=\"https://dx.doi.org/10.1016/j.seares.2015.06.010\" target=\"_blank\">https://dx.doi.org/10.1016/j.seares.2015.06.010</a>","BEntID":248898,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>J. Sea Res. 103</i>: 84-92. <a href=\"https://dx.doi.org/10.1016/j.seares.2015.06.010\" target=\"_blank\">https://dx.doi.org/10.1016/j.seares.2015.06.010</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Coolen, J.; Bos, O.; Glorius, S.; Lengkeek, W.; Cuperus, J.; van der Weide, B.; Agüera, A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Coolen, J. <i>et al.</i>","Englishabstract":"Reefs play an important role in the distribution of species associated with hard substrates and are of value for biodiversity conservation. High densities of the habitat building annelid <i>Lanice conchilega</i> also increase local biodiversity. This study describes the benthic biodiversity of a rocky reef and its surrounding sand bottom with dense <i>L. conchilega</i> beds in the Borkum Reef Grounds, north of the island of Schiermonnikoog in the Dutch North Sea. A side-scan sonar survey revealed distinct seabed areas with high acoustic reflections, indicating the presence of hard substrate on the sandy seafloor. To ground truth the side-scan sonar data and make an inventory of the biodiversity of the observed habitats, a multi-method sampling approach (box corer, SCUBA airlift sampler and visual transects, drop-down camera) was used. This revealed (1) rocky reefs: a combination of gravel, stones and rocks; (2) individual rocks in a sandy environment; (3) sand with dense <i>L. conchilega</i> beds (> 1500 ind·m<sup>-2</sup>) and (4) sand bottom habitat. A total of 193 taxa were found with many unique species per habitat. Species richness was significantly higher on sand when compared to the rocky reef (NB-GLM; p = 0.006), caused by the presence of dense <i>L. conchilega</i> beds (Poisson GLM; p < 0.001). Including dense <i>L. conchilega</i> beds as an additional habitat showed that these held a higher species richness than the rocky reefs (NB-GLM; p = 0.002), while sand without dense <i>L. conchilega</i> beds did not (NB-GLM; p = 0.14). Since the rocky reefs were present on a sandy bottom, the local biodiversity more than doubled with the presence of rocky reefs. The nMDS plot clearly separated the sand and rocky reef communities and also showed a clustering of dense <i>L. conchilega</i> beds within the sand samples. Each method detected unique species, demonstrating the value of a multi-method approach compared to e.g. box coring alone. This study identified several species previously unknown to the Borkum Reefs Grounds area. The total area of rocky reefs in the southern part of the Dutch Borkum Reef area is estimated to be 9.8 km<sup>2</sup> and of <i>L. conchilega</i> beds with densities > 1500 ind·m<sup>- 2</sup> to be 74 km<sup>2</sup>. Further research should focus on the possible function of <i>L. conchilega</i> as an ecosystem engineer creating intermediate sand-reef systems. For mapping these <i>L. conchilega</i> beds, we advise using side-scan sonar imaging combined with ground truthing by drop-down cameras.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Reefs, sand and reef-like sand: a comparison of the benthic biodiversity of habitats in the Dutch Borkum Reef Grounds","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-07 01:31:24.101648","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Rocky reefs; Benthic fauna; Epifauna; Lanice conchilega; North Sea;Biodiversity; Habitat type 1170","OtherDescriptors":null,"Notes":null,"AnaPub":2015,"MonPub":null,"DateUpdate":"2020-11-04","DateCreate":"2016-05-29","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000361160600009","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.seares.2015.06.010"},"refs":null,"anarec":{"AnaID":256889,"PubliDate":2015,"Pagination":"84-92","XtraPublOfAnaID":null,"ISBN":null,"Volume":"103","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43261,"SerRR":"Journal of Sea Research. Elsevier/Netherlands Institute for Sea Research: Amsterdam; Den Burg.  ISSN 1385-1101; e-ISSN 1873-1414","StandardTitleSer":"Journal of Sea Research","ISSN":"1385-1101","AbbrevSer":"J. 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