Martin Dj Sayer

Martin Dj Sayer
Tritonia Scientific Ltd · R&D

PhD

About

128
Publications
49,467
Reads
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2,589
Citations
Additional affiliations
March 1990 - April 2018
Scottish Association for Marine Science
Position
  • Head of Department
Description
  • Head of Unit: NERC National Facility for Scientific Diving & West Scotland Centre for Diving and Hyperbaric Medicine
January 1988 - January 1990
University of Nottingham
Position
  • PostDoc Position

Publications

Publications (128)
Article
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Dive computers have the potential to provide depth resolved temperature data that is often lacking especially in close to shore, but spatiotemporal assessment of the robustness of this citizen science approach has not been done. In this study, we provide this assessment for the Red Sea, one of the most dived areas in the world. A comparison was con...
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Kelp (Laminaria digitata) uses iodide as a unique inorganic antioxidant to protect its surface and apoplastic space against reactive oxygen species such as ozone, hydrogen peroxide and superoxide, with implications for atmospheric and marine chemistry as well as regional climatic processes. If kelp is covered by seawater, this results in iodide lea...
Article
Full-text available
Kelp (Laminaria digitata) uses iodide as a unique inorganic antioxidant to protect its surface and apoplastic space against reactive oxygen species such as ozone, hydrogen peroxide and superoxide, with implications for atmospheric and marine chemistry as well as regional climatic processes. If kelp is covered by seawater, this results in iodide lea...
Article
This study aimed to survey algal model organisms, covering phylogenetically representative and ecologically relevant taxa. Reports about the occurrence of sulfonates (particularly sulfoquinovose, taurine, and isethionate) in marine algae are scarce, and their likely relevance in global biogeochemical cycles and ecosystem functioning is poorly known...
Article
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There is a lack of depth-resolved temperature data, especially in coastal areas, which are often commonly dived by SCUBA divers. Many case studies have demonstrated that citizen science can provide high quality data, although users require more confidence in the accuracy of these data. This study examined the response time, accuracy and precision o...
Article
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Very little is known about the marine macroalgae of artificial reefs—especially in the North Atlantic—despite the growing number and extent of man-made structures in the sea, and even though seaweed communities have paramount importance as primary producers, but also as feeding, reproductive and nursery grounds in coastal ecosystems. This paper exp...
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Substratum collected during diving surveys of sublittoral communities off the Greek island of Rhodes (Dodecanese, South-East Aegean) in late 2015 was incubated in the laboratory. Among the emerging macroalgal germlings, there was the second-ever record and isolate of the small benthic multicellular alga Schizocladia ischiensis of the poorly known m...
Article
The genetic diversity, morphology and biogeography of Ammonia specimens was investigated across the Northeast (NE) Atlantic margins, to enhance the regional (palaeo)ecological studies based on this genus. Living specimens were collected from 22 sampling locations ranging from Shetland to Portugal to determine the distribution of Ammonia genetic typ...
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Global climate change is affecting carbon cycling by driving changes in primary productivity and rates of carbon fixation, release and storage within Earth's vegetated systems. There is, however, limited understanding of how carbon flow between donor and recipient habitats will respond to climatic changes. Macroalgal-dominated habitats, such as kel...
Article
The lack of long-term, highly resolved (annual to subannual) and absolutely dated baseline records of marine variability extending beyond the instrumental period (last ~50–100 years) hinders our ability to develop a comprehensive understanding of the role the ocean plays in the climate system. Specifically, without such records, it remains difficul...
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It is frequently assumed that taking samples of soft marine sediments using surface-based gravity coring equipment causes minimal disruption to their sedimentological, biogeochemical, and biological condition. This assumption was evaluated by examining the potential disturbances caused when obtaining soft-sediment samples either by SCUBA or Craib-c...
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Injuries suffered as a result of a rebreather oxygen explosion and fire occurred to a diver on vacation in the island state of Chuuk, Micronesia. The medical and logistical management of the diver in a remote location are described. The mechanism of both the fire and the subsequent blast and burn injuries are discussed. Prevention of and preparatio...
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Genetic characterisation (SSU rRNA genotyping) and Scanning Electron Microscope (SEM) imaging of individual tests were used in tandem to determine the modern species richness of the foraminiferal family Elphidiidae (Elphidium, Haynesina and related genera) across the Northeast Atlantic shelf biomes. Specimens were collected at 25 locations from the...
Article
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Monitoring temperature of aquatic waters is of great importance, with modelled, satellite and in-situ data providing invaluable insights into long-term environmental change. However, there is often a lack of depth-resolved temperature measurements. Recreational dive computers routinely record temperature and depth, so could provide an alternate and...
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Introduction: Divers can make adjustments to diving computers when they may need or want to dive more conservatively (e.g., diving with a persistent (patent) foramen ovale). Information describing the effects of these alterations or how they compare to other methods, such as using enriched air nitrox (EANx) with air dive planning tools, is lacking....
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Global climate change is expected to alter the polar bioregions faster than any other marine environment on Earth. This study assesses the biodiversity of seaweeds and associated eukaryotic pathogens of an established study site in northern Baffin Island (72° N), providing a baseline inventory for future work assessing impacts of the currently ongo...
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Carbon capture and storage is a mitigation strategy that can be used to aid the reduction of anthropogenic CO2 emissions. This process aims to capture CO2 from large point-source emitters and transport it to a long-term storage site. For much of Europe, these deep storage sites are anticipated to be sited below the sea bed on continental shelves. A...
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A 33-year-old, male professional scallop diver diving on the Outer Hebrides in Scotland rapidly developed symptoms of cerebral arterial gas embolism following a provocative dive with possibly a fast ascent. During transfer by helicopter to the mainland for treatment, his symptoms improved on surface oxygen. He was recompressed on a Royal Navy Treat...
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Kelp forests represent some of the most productive and diverse habitats on Earth. Understanding drivers of ecological patterns at large spatial scales is critical for effective management and conservation of marine habitats. We surveyed kelp forests dominated by Laminaria hyperborea (Gunnerus) Foslie 1884 across 9° latitude and >1000 km of coastlin...
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Dive computers are used in some occupational diving sectors to manage decompression but there is little independent assessment of their performance. A significant proportion of occupational diving operations employ single square-wave pressure exposures in support of their work. Single examples of 43 models of dive computer were compressed to five s...
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A possible effect of a carbon dioxide leak from an industrial sub-sea floor storage facility, utilised for Carbon Capture and Storage, is that escaping carbon dioxide gas will dissolve in sediment pore waters and reduce their pH. To quantify the scale and duration of such an impact, a novel, field scale experiment was conducted, whereby carbon diox...
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Fossil fuel power generation and other industrial emissions of carbon dioxide are a threat to global climate(1), yet many economies will remain reliant on these technologies for several decades(2). Carbon dioxide capture and storage (CCS) in deep geological formations provides an effective option to remove these emissions from the climate system(3)...
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For optimal safety a dive computer should be easy to use and the displayed information easy to understand. The present study examines the usability of dive computers and potential technologies to enhance safety. It should be noted that even if the ease of use of a dive computer is increased to an extent where it is intuitive to use, this does not r...
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Downloaded data from diving computers can offer invaluable insights into diving incidents resulting in fatalities. Such data form an essential part of subsequent investigations or in legal actions related to the diving incident. It is often tempting to accept the information being displayed from a computer download without question. However, there...
Chapter
Declines in many key fishery resources coupled with advances in the production of early life stages of some species with commercial significance has increased the feasibility of fishery management practices based on attempting to enhance fisheries using stock enhancement, restocking or sea ranching methods. Historical analyses of previous fishery m...
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In order to assess its potential as a sclerochronological archive, we present statistical and geochemical analyses of internal growth increment series in shells of the heart cockle Glossus humanus (L.), a large marine bivalve. The investigated samples were collected from Loch Sunart and the Sound of Mull, Scotland, United Kingdom. High-resolution s...
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Global climate change is expected to alter the Arctic bioregion markedly in coming decades. As a result, monitoring of the expected and actual changes has assumed high scientific significance. Many marine science objectives are best supported with the use of scientific diving techniques. Some important keystone environments are located in extremely...
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Forty seven models of diving computer were subjected to a range of nominal depths (10, 20, 30, 40 and 50m), in freshwater and seawater, in a simulated temperate environment. The depths downloaded from the computers were adjusted for density and compared to the published limits of the EU standard EN13319:2000 for depth-time measurement. The estimate...
Article
Sediment biogeochemical processes weremeasured on a transect of 4 stations FF 20W, 40W and 80W (number is metres from the fish farm, FF, to the west) at the Ardag gilthead seabream Sparus aurata farm in the Gulf of Aqaba, a highly oligotrophic system renowned for its clear water and diverse corals. At each station samples were taken for analysis of...
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Obtaining accurate and affordable geo-referencing is not straightforward for divers because there is a lack of through-water penetration by global positioning systems (GPS). Although a number of commercially available systems exist, few are low-cost or operationally flexible enough for use in scientific diving. The present paper details a new GPS d...
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There is a time line for divers who develop decompression illnesses (DCI) from the completion of their dive to the initiation of recompression. The time to treatment is influenced by many factors; two being the time before acknowledgement that the diver has a pressure-related illness and the time taken for transfer from that point to commencment of...
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Many modern diving decompression computers have the ability to record and display information of, and related to, the dive profile. In the UK, there are currently approximately 50 models of diving decompression computer being sold with a capability for recording and downloading dive information. Based on the technical information either supplied wi...
Article
This paper describes potential methods for reconstructing past marine environmental and climatic variability in Scottish coastal waters through the investigation of annual growth increments measured from shells of the long-lived marine bivalve Arctica islandica (L.). This is accomplished by using a combination of sclerochronological and dendrochron...
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Artificial reefs are constructed for many reasons around the world, but they usually have to comply with some form of regulation which may require demonstration of accurate deployment through some form of post construction measurement. Reefs related to fisheries are often subjected to scientific census to assess whether production and/or residence...
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Introduction: We examined national and single-centre datasets in Scotland to determine any trends in the treatment of diving-related disease and to assess how the choice of first treatment may be linked to the divers' condition on referral and on discharge. Method: Two datasets were analysed: (1) 300 divers treated for actual or suspected decomp...
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Nearly 4% of all primary recompression treatments in Scotland employ saturation tables (helium/oxygen-oxygen/air or oxygen/air alone). These cases usually involve divers presenting at the surface who then develop deteriorating spinal cord injury with varying degrees of cerebral involvement. Treatment is delivered either through immediate saturation...
Article
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Sayer MDJ, Ross JAS, Wilson CM. Analysis of two datasets of divers with actual or suspected decompression illness. Diving and Hyperbaric Medicine. 2009;39(3):126-32.) Introduction: We examined national and single-centre datasets in Scotland to determine any trends in the treatment of diving-related disease and to assess how the choice of first trea...
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Clinical audit is an essential element to the maintenance or improvement of delivery of any medical service. During the development phase of a National Recompression Registration Service for Scotland, clinical audit was initiated to provide a standardised tool to monitor the quality of outcome with respect to the severity of presentation. A functio...
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Hunter, W. R., and Sayer, M. D. J. 2009. The comparative effects of habitat complexity on faunal assemblages of northern temperate artificial and natural reefs. – ICES Journal of Marine Science, 66: 691–698. Several north temperate marine species were recorded on subtidal hard-substratum reef sites selected to produce a gradient of structural compl...
Article
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This paper highlights the methods used to reconstruct past marine environmental variability in Scottish coastal waters through the investigation of annual growth increments measured from shells of the long-lived marine bivalve Arctica islandica (L.). This is achieved using a combination of sclerochronological and dendrochronological techniques. Wha...
Article
In the UK, scientific diving has been designated as one of the five main professional sectors of the diving industry since 1997. As such, anyone in the UK diving in support of science for their work, must comply with the 1997 Diving at Work Regulations which are a Statutory Instrument of the UK 1974 Health and Safety at Work etc. Act. This paper ou...
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Wreck diving at Bikini Atoll consists of a relatively standard series of decompression dives with maximum depths in the region of 45-55 metres' sea water (msw). In a typical week of diving at Bikini, divers can perform up to 12 decompression dives to these depths over seven days; on five of those days, divers can perform two decompression dives per...
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Three cases are presented where there is a direct link between how the divers used their dive computers and the eventual requirement for their therapeutic recompression. The first case involves a diver with a previous history of decompression incidents making adjustments to their dive computer without understanding the outcomes of those alterations...
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Two cases are presented of divers suffering epileptic seizure and loss of consciousness as a result of probable cerebral arterial gas embolism (CAGE). Both cases had apparently problem-free dives with no obvious provocation for CAGE, though one case may have been having repeated embolisms for some time in their diving career. Demonstrated also is t...
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There is little quantitative information by which to assess the recent importance of diving to the scientific community. This review is a bibliographic analysis of the papers published from 1995 to 2006 that have been supported by scientific diving. Diving supports scientific research through efficient and targeted sampling (including numerous new...
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Several studies have attempted to compare subtidal animal population estimates obtained in a variety of ways using SCUBA diving and have reported a lot of variation between the estimates obtained. This study investigated individually scale-, tidal-, equipment- and observer-induced variation through analysis of animal population density indices obta...
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A 33-year-old male was diving in excess of 50 metres of water in a marine tunnel at a remote location off the west coast of Scotland when he ran out of air. He made an emergency ascent and was recovered unconscious on the surface; he was not breathing, had no pulse and had missed a significant amount of decompression. Following resuscitation he was...
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A comparative study was carried out to evaluate the efficiency of a number of techniques commonly used for assessing the structure of subtidal epifaunal communities. Assessments were made of the epifaunal assemblages fouling two substrata: concrete and PVC plastic. Where possible, each technique was undertaken in three ways, namely, in situ underwa...
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A study of seasonal, locational and sexual variations of growth, diet, somatic condition (Ks), gonadosomatic condition (GSI) and hepatosomatic condition (HSI), of the goldsinny wrasse, Ctenolabrus rupestris, was made on specimens taken from three areas (Millport, Oban and Luing) of the west coast of Scotland from May 1992 to June 1993. Capture thro...
Article
Freshly fertilized ova of brown trout, Salmo trutta L., were exposed to all possible mixtures of Al (6000 nmol 11), Cu (80 nmol 1−1), Pb (50 nmol 1−1) and Zn (300 nmol 1 1). In a separate experiment, newly hatched brown trout yolk-sac fry were exposed to Mn (1500 nmol 1−1), Fe (2500 nmol 1 1), Ni (200 nmol 1−1) or Cd (4 nmol 1 1), separately, and i...
Article
The numbers of mucous cells in the epidermis of the head and body and in the surface of the gill arch of the amphibious blenny, Blennius pholis L., were estimated on fish immersed in sea water and after 4 h aerial exposure. During emersion there appeared to be a considerable reduction in the frequency of epithelial mucous cells in the areas studied...
Article
Preliminary field observations on a large-scale multi-reef artificial reef system in Scotland indicated that the provision of artificial habitat of varying design alters the numbers and types of fishes present in areas where they were previously largely absent. These modifications could, in time, be highly beneficial to any programme of fishery enh...