Abstract The effects of sea lice on the marine survival wild salmonids are widely debated. In Norway this debate has reached a crescendo as Norwegian government recently ratified management system where growth in salmonid aquaculture industry will be conditional regional estimated impact salmon fish. Sea have thus become most prominent obstacle to stated political aim quintupling production by 2050. Scientific documentation that is robust. However, it also evident strongly impacted other...

Abstract Mating between relatives often results in negative fitness consequences or inbreeding depression. However, the expression of populations wild cooperative mammals and effects environmental, maternal social factors on depression these systems are currently not well understood. This study uses pedigree‐based coefficients from a long‐term meerkats ( Suricata suricatta ) South Africa to reveal that 44% population have detectably non‐zero F > 0) coefficients. 15% inbred individuals...

Molecular epidemiology reveals that aquaculture contributes to emergence of a fish virus at both global and local epidemic hierarchies.

Some authors have suggested that prey species stand to benefit most by defending as early possible during predator-prey encounters, but in nature employ antipredator defenses at various stages of interactions with their predators. Whether it is generally advantageous defend or late such encounters an open theoretical question. We model conditions under which a might evolve response predation. Adapting two-prey, one-predator Rosenzweig-MacArthur system differential equations, we analyze the...

Summary Multiple approaches exist to model patterns of space use across species, among them resource selection analysis, statistical home‐range modelling and mechanistic movement modelling. Mechanistic models combine the benefits these approaches, describing emergent territorial based on fine‐scale individual‐ or group‐movement rules incorporating interactions with neighbours environment. These have not, date, been extended dynamic contexts. Using models, we explore meerkat ( Suricata...

Abstract Intrapopulation variability in resource acquisition (i.e., niche variation) influences population dynamics, with important implications for conservation planning. Spatial analyses of variation within and among populations can provide relevant information about ecological associations their subsequent management. We used stable isotope analysis kernel‐weighted regression to examine spatial patterns a keystone consumer–resource interaction: salmon ( Oncorhynchus spp.) consumption by...

ABSTRACT Long‐term field studies have been invaluable in the study of ecology and evolution; however, for particularly long‐lived species, even long‐term often rely on estimated ages, example when investigating demographic processes. One approach is to estimate unknown birth dates from known timing other life‐history events. Building previous methods, we update estimation techniques Northern Resident killer whales (NRKW; Orcinus orca ) as part an ongoing that began 1973. Despite almost 50...

Summary 1. For social species, the link between individual behaviour and population dynamics is mediated by group‐level demography. 2. Populations of obligate cooperative breeders are structured into groups, which may be subject to inverse density dependence (Allee effects) that result from a on conspecific helpers, but evidence for population‐wide Allee effects rare. 3. We use field data long‐term study meerkats ( Suricata suricatta ; Schreber, 1776) – species local not reflected in...

Social and environmental factors influence key life-history processes population dynamics by affecting fitness-related phenotypic traits such as body mass. The role of mass is particularly pronounced in cooperative breeders due to variation social status consequent access resources. Investigating the mechanisms underlying its demographic consequences can help elucidate how affect cooperatively breeding populations. In this study, we present an analysis effect individual on temporal group...

Dispersal is a key process influencing the dynamics of socially and spatially structured populations. success determined by state individuals at emigration costs incurred after emigration. However, quantification such often difficult, due to logistical constraints following wide-ranging individuals. We investigated effects dispersal on individual body mass stress hormone levels in cooperative breeder, meerkat ( Suricata suricatta). measured faecal glucocorticoid metabolite (fGCM)...

The spread of infection from reservoir host populations is a key mechanism for disease emergence and extinction risk management concern salmon aquaculture fisheries. Using quantitative environmental DNA methodology, we assessed pathogen in relation to farms coastal British Columbia, Canada, by testing 39 species pathogens (viral, bacterial, eukaryotic) 134 marine samples at 58 farm sites (both active inactive) over 3 years. Environmental 22 was detected 496 times varied their occurrence...

Recent decades have seen an increased appreciation for the role infectious diseases can play in mass mortality events across a diversity of marine taxa. At same time many Pacific salmon populations declined abundance as result reduced survival. However, few studies explicitly considered potential pathogens could these declines. Using multi-year dataset spanning 59 pathogen taxa Chinook and Coho sampled along British Columbia coast, we carried out exploratory analysis to quantify evidence...

Population dynamics in group‐living species can be strongly affected both by features of sociality per se and resultant population structure. To develop a mechanistic understanding highly social we need to investigate how processes within groups, linking external drivers act interact produce observed patterns. We model group cooperatively breeding meerkats, Suricata suricatta , paying attention local demographic as well dispersal processes. use generalized additive models describe the...

AEI Aquaculture Environment Interactions Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 1:137-146 (2010) - DOI: https://doi.org/10.3354/aei00014 Dynamics of outbreak and control salmon lice on two farms in Broughton Archipelago, British Columbia Martin Krkošek1,4,*, Andrew Bateman2, Stan Proboszcz3, Craig Orr3 1School Aquatic Fishery Science, University Washington, Seattle, Washington...

Juvenile sockeye salmon (Oncorhynchus nerka) in British Columbia migrate past numerous Atlantic (Salmo salar) farms from which they may acquire infectious agents. We analyse patterns of molecular detection juvenile for the bacterium Tenacibaculum maritimum, known to cause disease fish globally and mouthrot farmed Columbia. Our data show a clear peak T. maritimum detections Discovery Islands region Columbia, where close farms. Using well-established differential equation models describe...

Research on cooperatively breeding species has shown that their population dynamics differ from those of conventional breeders. Populations cooperators are structured into groups, and group‐level Allee effects likely common. We assess the ability phenomenological models, lacking explicit group structure, to describe in cooperative meerkats Suricata suricatta , we potential at level. Using maximum likelihood model fitting information theoretic selection, applied time series data a wild...

Summary Resource availability plays a key role in driving variation somatic growth and body condition, the factors determining access to resources vary considerably across life stages. Parents carers may exert important influences early life, when individuals are nutritionally dependent, with abiotic environmental effects having stronger later development as forage independently. Most studies have measured specific influencing or compared relative of different within Such not capture whether...

Individual variation in growth is high cooperative breeders and may reflect plastic divergence developmental trajectories leading to breeding vs. helping phenotypes. However, the relative importance of additive genetic variance plasticity shaping largely unknown vertebrates. This study exploits weekly sequences body mass from birth adulthood investigate sources in, covariance between, early later wild meerkats (Suricata suricatta), a mongoose. Our results indicate that (i) correlation...

The advent and growth of salmon farming has changed the epidemiology some diseases. In 2015, in salmon-farming region Broughton Archipelago, British Columbia, an outbreak native ectoparasitic copepods (sea lice; Lepeophtheirus salmonis) recurred wild juvenile after a decade effective control. We draw on 15-year data set sea lice farmed area to assess evidence for four factors that may explain recent outbreak: (i) poorly timed parasiticide treatments relative migration, (ii) evolution...

Abstract Resource waves—spatial variation in resource phenology that extends feeding opportunities for mobile consumers—can affect the behaviour and productivity of recipient populations. Interspecific diversity among Pacific salmon species ( Oncorhynchus spp.) creates staggered spawning events across space time, thereby prolonging availability to terrestrial wildlife. We sought understand how such might influence consumption by predators compared with abundance intra‐ interspecific...

Rapid expansion of salmon aquaculture has resulted in high-density populations that host diverse infectious agents, for which surveillance and monitoring are critical to disease management. Screening can reveal infection diversity from arises, differential patterns live dead fish difficult collect wild populations, potential risks associated with agent transmission between farmed hosts. We report results a multi-year infectious-agent screening program British Columbia, Canada, using...

Abstract Although infectious agents can act as strong population regulators, knowledge of their spatial distributions in wild Pacific salmon is limited, especially the marine environment. Characterizing pathogen during early residence, a period considered survival bottleneck for salmon, may reveal where populations are exposed to potentially detrimental pathogens. Using high-throughput qPCR, we determined prevalence 56 5719 Chinook, 2032 Coho and 4062 Sockeye sampled between 2008 2018, first...