IntroductionDrowning is a leading cause of unintentional death, especially for males. In Australian coastal waters, young male adults account for 25% of the burden of male drowning. This study aims to describe young male coastal drowning deaths and to examine the prevalence of risk factors, especially alcohol and drugs.MethodsCharacteristics of unintentional fatal drowning involving males (15–34 years) were compared with other adults (15 years and older). Data were sourced from the National Coronial Information System (Australia) and Surf Life Saving incident reports (2004/2005–2018/2019). Relative risk was calculated and χ2 tests of independence were performed (p<0.05). Blood alcohol and drug concentrations were analysed with permutational analyses of variance.ResultsYoung males drowned more while jumping (9.85 times), swimming/wading (1.41 times), at rock/cliff locations (1.42 times) and on public holidays (1.8 times). Young males drowned less while boating (0.81 times), scuba diving (2.08 times), offshore (1.56 times) or due to medical factors (3.7 times). Young males drowned more (1.68 times) after consuming illicit drugs (amphetamines 2.26 times; cannabis 2.25 times) and less with prescription drugs (benzodiazepines 2.6 times; opiates 4.1 times; antidepressants 7.7 times). Blood serum concentrations of cannabis were higher in young males, while amphetamine and alcohol were lower.DiscussionUnsafe behaviours alongside certain activities or locations create deadly combinations of risk factors. A relationship between age, activity, attitude and affluence is proposed, where young males drown more in affordable activities with fewer regulations. Our results support multilevel strategies (spanning life stages) to reduce young male coastal drowning.
Objective Coastal drowning is a global public health problem which requires evidence to support safety initiatives. The growing multidisciplinary body of coastal drowning research and associated prevention countermeasures is diverse and has not been characterised as a whole. The objective of this scoping review was to identify key concepts, findings, evidence and research gaps in the coastal drowning literature to guide future research and inform prevention activities. Methods We conducted a scoping review to identify peer reviewed studies published before May 2020 reporting either (i) fatal unintentional coastal drowning statistics from non-boating, -disaster or -occupational aetiologies; (ii) risk factors for unintentional fatal coastal drowning; or (iii) coastal drowning prevention strategies. Systematic searches were conducted in six databases, two authors independently screened studies for inclusion and one author extracted data using a standardised data charting form developed by the study team. Results Of the 146 included studies, the majority (76.7%) were from high income countries, 87 (59.6%) reported coastal drowning deaths, 61 (41.8%) reported risk factors, and 88 (60.3%) reported prevention strategies. Populations, data sources and coastal water site terminology in the studies varied widely; as did reported risk factors, which most frequently related to demographics such as gender and age. Prevention strategies were commonly based on survey data or expert opinion and primarily focused on education, lifeguards and signage. Few studies (n = 10) evaluated coastal drowning prevention strategies. Discussion Coastal drowning is an expansive, multidisciplinary field that demands cross-sector collaborative research. Gaps to be addressed in coastal safety research include the lack of research from lower resourced settings, unclear and inconsistent terminology and reporting, and the lack of evaluation for prevention strategies. Advancing coastal drowning science will result in a stronger evidence base from which to design and implement effective countermeasures that ultimately save lives and keep people safe.
Biofilms are integral to many marine processes but their formation and function may be affected by anthropogenic inputs that alter environmental conditions, including fertilisers that increase nutrients. Density composition and connectivity of biofilms developed in situ (under ambient and elevated nutrients) were compared using 454-pyrosequencing of the 16S gene. Elevated nutrients shifted community composition from bacteria involved in higher processes (eg Pseudoalteromonas spp. invertebrate recruitment) towards more nutrient-tolerant bacterial species (eg Terendinibacter sp.). This may enable the persistence of biofilm communities by increasing resistance to nutrient inputs. A core biofilm microbiome was identified (predominantly Alteromonadales and Oceanospirillales) and revealed shifts in abundances of core microbes that could indicate enrichment by fertilisers. Fertiliser decreased density and connectivity within biofilms indicating that associations were disrupted perhaps via changes to energetic allocations within the core microbiome. Density composition and connectivity changes suggest nutrients can affect the stability and function of these important marine communities.
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