Length and associated characteristics of short-term detentions: an analysis of detentions under the Mental Health Act in Scotland, 2006-2018.

PURPOSE: The Mental Health Act in Scotland is under review. Previous iterations increased patients' rights but the maximum time for short-term detentions remains unchanged, despite evolving psychiatric treatment models. We explored length, mode of ending and factors of influence on the application of short-term detention certificates (STDCs), which can last up to 28 days, across Scotland between 2006 and 2018. METHODS: Data on age, gender, ethnicity, date of commencement and ending of the STDC and detention site from all 42,493 STDCs issued to 30,464 patients over 12 years were extracted from the national repository for detentions under the Mental Health (Care and Treatment) (Scotland) Act 2003 and analysed using mixed models. RESULTS: One in five STDCs lapsed on day 28. Two in five were revoked and the remainder extended to a treatment order. STDCs that were not extended averaged 19 days, and revoked STDCs 14 days. The probability of a detention lapsing varied across hospitals and increased with patient age. The odds of a detention lapsing on day 28 were 62% lower and revoked detentions 10% shorter in 2018 relative to 2006. The odds of a detention extending decreased significantly from 2012 to 2018. Extended STDCs were associated with increased patient age, male gender, and ethnicity other than White Scottish. There was little initiation of or active revocation of STDCs on weekend days. CONCLUSION: The length of STDCs reduced over time, fewer detentions lapsed, and weekday patterning was evident in each year. These data can inform legislative and service reviews.

Breeding density, fine-scale tracking, and large-scale modeling reveal the regional distribution of four seabird species.

Population-level estimates of species' distributions can reveal fundamental ecological processes and facilitate conservation. However, these may be difficult to obtain for mobile species, especially colonial central-place foragers (CCPFs; e.g., bats, corvids, social insects), because it is often impractical to determine the provenance of individuals observed beyond breeding sites. Moreover, some CCPFs, especially in the marine realm (e.g., pinnipeds, turtles, and seabirds) are difficult to observe because they range tens to ten thousands of kilometers from their colonies. It is hypothesized that the distribution of CCPFs depends largely on habitat availability and intraspecific competition. Modeling these effects may therefore allow distributions to be estimated from samples of individual spatial usage. Such data can be obtained for an increasing number of species using tracking technology. However, techniques for estimating population-level distributions using the telemetry data are poorly developed. This is of concern because many marine CCPFs, such as seabirds, are threatened by anthropogenic activities. Here, we aim to estimate the distribution at sea of four seabird species, foraging from approximately 5,500 breeding sites in Britain and Ireland. To do so, we GPS-tracked a sample of 230 European Shags Phalacrocorax aristotelis, 464 Black-legged Kittiwakes Rissa tridactyla, 178 Common Murres Uria aalge, and 281 Razorbills Alca torda from 13, 20, 12, and 14 colonies, respectively. Using Poisson point process habitat use models, we show that distribution at sea is dependent on (1) density-dependent competition among sympatric conspecifics (all species) and parapatric conspecifics (Kittiwakes and Murres); (2) habitat accessibility and coastal geometry, such that birds travel further from colonies with limited access to the sea; and (3) regional habitat availability. Using these models, we predict space use by birds from unobserved colonies and thereby map the distribution at sea of each species at both the colony and regional level. Space use by all four species' British breeding populations is concentrated in the coastal waters of Scotland, highlighting the need for robust conservation measures in this area. The techniques we present are applicable to any CCPF.

Variation in Population Synchrony in a Multi-Species Seabird Community: Response to Changes in Predator Abundance.

Ecologically similar sympatric species, subject to typical environmental conditions, may be expected to exhibit synchronous temporal fluctuations in demographic parameters, while populations of dissimilar species might be expected to show less synchrony. Previous studies have tested for synchrony in different populations of single species, and those including data from more than one species have compared fluctuations in only one demographic parameter. We tested for synchrony in inter-annual changes in breeding population abundance and productivity among four tern species on Coquet Island, northeast England. We also examined how manipulation of one independent environmental variable (predator abundance) influenced temporal changes in ecologically similar and dissimilar tern species. Changes in breeding abundance and productivity of ecologically similar species (Arctic Sterna paradisaea, Common S. hirundo and Roseate Terns S. dougallii) were synchronous with one another over time, but not with a species with different foraging and breeding behaviour (Sandwich Terns Thalasseus sandvicensis). With respect to changes in predator abundance, there was no clear pattern. Roseate Tern abundance was negatively correlated with that of large gulls breeding on the island from 1975 to 2013, while Common Tern abundance was positively correlated with number of large gulls, and no significant correlations were found between large gull and Arctic and Sandwich Tern populations. Large gull abundance was negatively correlated with productivity of Arctic and Common Terns two years later, possibly due to predation risk after fledging, while no correlation with Roseate Tern productivity was found. The varying effect of predator abundance is most likely due to specific differences in the behaviour and ecology of even these closely-related species. Examining synchrony in multi-species assemblages improves our understanding of how whole communities react to long-term changes in the environment and suggests that changes in predator abundance may differentially affect populations of sympatric seabird species.