Digital Commons Network^™

Seasonal Variation Of Bacterial Diversity Along The Marine Particulate Matter Continuum, Mireia Mestre, Juan Höfer, M. Montserrat Sala, Josep M. Gasol

Research outputs 2014 to 2021

© Copyright © 2020 Mestre, Höfer, Sala and Gasol. Seasonal dynamics of ocean prokaryotic communities in the free-living fraction have been widely described, but less is known about the seasonality of prokaryotes inhabiting marine particles. We describe the seasonality of bacterial communities in the particulate matter continuum by sampling monthly over two years in a temperate oligotrophic coastal ecosystem and using a serial filtration (including six size-fractions spanning from 0.2 to 200 μm). We observed that bacterial communities in the particulate matter continuum had annual changes following harmonic seasonal oscillations, where alpha, beta, and gamma diversity increased during the warm …

Sampling Device-Dependence Of Prokaryotic Community Structure On Marine Particles: Higher Diversity Recovered By In Situ Pumps Than By Oceanographic Bottles, Viena Puigcorbe, Clara Ruiz-Gonzalez, Pere Masque´, Josep M. Gasol

Research outputs 2014 to 2021

Microbes associated with sinking marine particles play key roles in carbon sequestration in the ocean. The sampling of particle-attached microorganisms is often done with sediment traps or by filtration of water collected with oceanographic bottles, both involving a certain time lapse between collection and processing of samples that may result in changes in particle-attached microbial communities. Conversely, in situ water filtration through submersible pumps allows a faster storage of sampled particles, but it has rarely been used to study the associated microbial communities and has never been compared to other particle-sampling methods in terms of the recovery of particle microbial …

Non-Song Vocalizations Of Humpback Whales In Western Australia, Angela Recalde-Salas, Christine Erbe, Chandra Salgado Kent, Miles Parsons

Research outputs 2014 to 2021

This study presents non-song vocalizations of humpback whales (Megaptera novaeangliae) from two migratory areas off the Western Australian coast: Geographe Bay and Port Hedland. A total of 220 sounds were identified as non-song sounds in 193 h of recordings reviewed. Of those, 68 were measured and qualitatively classified into 17 groups using their spectral features. One group (HW-02) had a high level of variation in terms of spectral slope. However, further classification using statistical classification methods was not possible because of the small sample size. Non-song sound frequencies varied from 9 Hz to 6 kHz, with the majority of sounds …

Imputation Of Missing Data From Time-Lapse Cameras Used In Recreational Fishing Surveys, Ebenezer Afrifa-Yamoah, Stephen M. Taylor, Aiden Fisher, Ute Mueller

Research outputs 2014 to 2021

While remote camera surveys have the potential to improve the accuracy of recreational fishing estimates, missing data are common and require robust analytical techniques to impute. Time-lapse cameras are being used in Western Australia to monitor recreational boating activities, but outages have occurred. Generalized linear mixed effect models formulated in a fully conditional specification multiple imputation framework were used to reconstruct missing data, with climatic and some temporal classifications as covariates. Using a complete 12-month camera record of hourly counts of recreational powerboat retrievals, data were simulated based on ten observed camera outage patterns, with a missing proportion of between …

Personal Carbon Trading, Carbon-Knowledge Management And Their Influence On Environmental Sustainability In Thailand, Dadang Dally, Kurhayadi, Yeti Rohayati, Soheil Kazemian

Research outputs 2014 to 2021

© 2020, Econjournals. All rights reserved. The relationship between personal carbon trading, carbon knowledge management and their impact on the environmental sustainability has got very little attention. Inspired from this gap in the literature, present research is exploring the relationship between carbon trading, carbon knowledge and their combine impact on sustainability of the natural environment in Thailand. A questionnaire is designed based on the various factors of both exogeneous and endogenous variables of the study. A sample of 251 respondents was collected for both measurement and structural equation models. Additionally, some descriptive measures are also calculated and presented which provide …

Statements About The Pervasiveness Of Behavior Require Data About The Pervasiveness Of Behavior, Craig P. Speelman, Marek Mcgann

Research outputs 2014 to 2021

Despite recent close attention to issues related to the reliability of psychological research (e.g., the replication crisis), issues of the validity of this research have not been considered to the same extent. This paper highlights an issue that calls into question the validity of the common research practice of studying samples of individuals, and using sample-based statistics to infer generalizations that are applied not only to the parent population, but to individuals. The lack of ergodicity in human data means that such generalizations are not justified. This problem is illustrated with respect to two common scenarios in psychological research that …

Co-Occurrence Across Time And Space Of Drug- And Cannabinoid- Exposure And Adverse Mental Health Outcomes In The National Survey Of Drug Use And Health: Combined Geotemporospatial And Causal Inference Analysis, Albert Stuart Reece, Gary Hulse

Research outputs 2014 to 2021

Background: Whilst many studies have linked increased drug and cannabis exposure to adverse mental health (MH) outcomes their effects on whole populations and geotemporospatial relationships are not well understood.

Methods

Ecological cohort study of National Survey of Drug Use and Health (NSDUH) geographically-linked substate-shapefiles 2010–2012 and 2014–2016 supplemented by five-year US American Community Survey. Drugs: cigarettes, alcohol abuse, last-month cannabis use and last-year cocaine use. MH: any mental illness, major depressive illness, serious mental illness and suicidal thinking. Data analysis: two-stage, geotemporospatial, robust generalized linear regression and causal inference methods in R.

Results

410,138 NSDUH respondents. Average response rate 76.7%. …