Mapping of Lophelia reefs in Norway: experiences and survey methods

Fosså, Jan Helge; Lindberg, Bjørn; Christensen, Ole; Lundälv, Tomas; Svellingen, Ingvald; Mortensen, Pål B.; Alvsvåg, John

doi:10.1007/3-540-27673-4_18

Cited by 82 publications

(66 citation statements)

References 29 publications

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“…The majority of the Hannibal Bank is greater than 50m in depth, beyond that which can be reached by scuba divers. An ROv would offer a suitable sampling non-invasive tool compared to dredging and trawling and hence reduces the impact of surveying on the habitats of interest, and it can cover a wide area (Fossa et al, 2005;Roberts et al, 2005). The data collected can also allow relatively detailed taxonomic identification to be made, with resulting qualitative and quantitative ecological discrimination possible (sensu Mortensen, Buhl-Mortensen, Gebruk & Krylova, 2008).…”

Section: Discussionmentioning

confidence: 99%

Morfología y estructura de la zona especial de manejo de Banco Hannibal, Pacífico de Panamá mediante el uso de sensores remotos acústicos

Cunningham

Guzmán

Bates

2013

RBT

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Morfología y estructura de la zona especial de manejo de Banco Hannibal, Pacífico de Panamá mediante el uso de sensores remotos acústicos. The Hannibal Bank sits within the Coiba UNESCO World Heritage Site in Pacific Panama and is also a fisheries management zone. Despite the protected status of the area and the importance of the Bank for commercial fish species such as snapper and tuna, the seamount has received no detailed survey except some collection of organisms. This study mapped the major topographic features and complexity of the Hannibal Bank seamount using acoustic remote sensing. A survey area of around 125km 2 was defined using existing charts and side-scan sonar data were collected during July 2008. A bathymetric output was imported to ArcGIS where a digital bathymetric model and slope map were created. The Benthic Terrain Modeler (BTM) extension for ArcGIS was used to calculate bathymetric position index and rugosity, and used to create a map of zones representing the various seabed morphology zones. The Hannibal bank is an elongated, triangular guyot (flat topped seamount), which ranges in depth from 53m to 416m, covers an area of 76km 2 and is 14.4km long and 7.1km wide. Hannibal bank is composed of steep slopes, more gentle slopes, top of the seamount, crests (elevated ridges at the top of the pinnacles), rugose areas (on crests, top of seamount and slope), gullies and pinnacles. The bank is asymmetric in nature with the Northerly side having a relatively gentle slope with gullies across the surface compared to the SouthWest side which is far steeper and more rugose. There are two pinnacles to the North and South East of the bank that range in depth from 180 to 333m. Rocky substrate makes up 22.6km 2 of the bank and sediment 37.8km 2 . The bank and its steeply sided, rugose areas and pinnacles provide upright structures which can disrupt and topographically enhance currents, increasing productivity. The rugose areas of Hannibal Bank should be primary targets for further research efforts as they may contain corals and their rugosity indicates that these should be some of the highest faunal diversity areas of the bank. Hannibal Bank is likely to come increasing pressure in the future through climate change and fishing and this study has produced valuable information to assist in the future mapping and management of habitats, associated species and fisheries. Rev. Biol. Trop. 61 (4): 1967Trop. 61 (4): -1979. Epub 2013 December 01.Key words: acoustic survey, seamount, banks, seabed, topography, bathymetry.Increasing concern over anthropogenic pressure on the marine environment has driven managers and policy makers to seek out effective tools for mapping, monitoring and protecting vulnerable habitats. To effectively manage the marine environment and its resources requires knowledge of the spatial distribution of species and habitats (Freeman & Rogers, 2003). It has previously been difficult to undertake on a wide scale because traditional marine survey techniques such as trawls and grabs s...

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Section: Discussionmentioning

confidence: 99%

Morfología y estructura de la zona especial de manejo de Banco Hannibal, Pacífico de Panamá mediante el uso de sensores remotos acústicos

Cunningham

Guzmán

Bates

2013

RBT

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“…Many modifications of SBES were suggested through time to increase their performance. For instance, the splitbeam echosounder uses interferometry to improve the accuracy of the data and was used to determine slope directly (Fosså et al, 2005). The dual-beam echosounder uses two beams of different aperture oriented in the same direction to locate targets more accurately.…”

Section: A3 Acoustic Remote Sensingmentioning

confidence: 99%

A review of marine geomorphometry, the quantitative study of the seafloor

Lecours

Dolan

Micallef

et al. 2016

Hydrol. Earth Syst. Sci.

178

120

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Abstract. Geomorphometry, the science of quantitative terrain characterization, has traditionally focused on the investigation of terrestrial landscapes. However, the dramatic increase in the availability of digital bathymetric data and the increasing ease by which geomorphometry can be investigated using geographic information systems (GISs) and spatial analysis software has prompted interest in employing geomorphometric techniques to investigate the marine environment. Over the last decade or so, a multitude of geomorphometric techniques (e.g. terrain attributes, feature extraction, automated classification) have been applied to characterize seabed terrain from the coastal zone to the deep sea. Geomorphometric techniques are, however, not as varied, nor as extensively applied, in marine as they are in terrestrial environments. This is at least partly due to difficulties associated with capturing, classifying, and validating terrain characteristics underwater. There is, nevertheless, much common ground between terrestrial and marine geomorphometry applications and it is important that, in developing marine geomorphometry, we learn from experiences in terrestrial studies. However, not all terrestrial solutions can be adopted by marine geomorphometric studies since the dynamic, fourdimensional (4-D) nature of the marine environment causes its own issues throughout the geomorphometry workflow. For instance, issues with underwater positioning, variations in sound velocity in the water column affecting acousticbased mapping, and our inability to directly observe and measure depth and morphological features on the seafloor are all issues specific to the application of geomorphometry in the marine environment. Such issues fuel the need for a dedicated scientific effort in marine geomorphometry.This review aims to highlight the relatively recent growth of marine geomorphometry as a distinct discipline, and offers the first comprehensive overview of marine geomorphometry to date. We address all the five main steps of geomorphometry, from data collection to the application of terrain attributes and features. We focus on how these steps are relevant to marine geomorphometry and also highlight differences and similarities from terrestrial geomorphometry. We conclude with recommendations and reflections on the future of marine geomorphometry. To ensure that geomorphometry is used and developed to its full potential, there is a need to increase awareness of (1) marine geomorphometry amongst scientists already engaged in terrestrial geomorphometry, and of (2) geomorphometry as a science amongst marine scientists with a wide range of backgrounds and experiences.

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“…Many of these reefs are several 100 m long and occur in clusters (reef complexes) up to 35 km long (Røst reef) [54]. Their area, however, covers less than 0.1% of the total area of the depth zone where they occur.…”

Section: Morphologymentioning

confidence: 99%

Cold Temperate Coral Habitats

Buhl‐Mortensen¹,

Buhl-Mortensen²

2018

Corals in a Changing World

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Cold-water coral habitats are constituted by a great variety of anthozoan taxa, with reefs and gardens being homes for numerous invertebrates and fish species. In the cold temperate North Atlantic, some coral habitats such as Lophelia pertusa reefs, and Primnoa/Paragorgia dominated coral gardens occur on both sides of the Atlantic over a wide latitudinal range. Other habitats, as some dominated by species of Isididae and Chrysogorgidae seem to have a more local/regional distribution. In this chapter, we describe the habitat characteristics of cold-water coral reefs, soft and hard-bottom coral gardens, and sea pen meadows with their rich associated fauna illustrated with numerous photos.

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Mapping of Lophelia reefs in Norway: experiences and survey methods

Cited by 82 publications

References 29 publications

Morfología y estructura de la zona especial de manejo de Banco Hannibal, Pacífico de Panamá mediante el uso de sensores remotos acústicos

Morfología y estructura de la zona especial de manejo de Banco Hannibal, Pacífico de Panamá mediante el uso de sensores remotos acústicos

A review of marine geomorphometry, the quantitative study of the seafloor

Cold Temperate Coral Habitats

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