The possibility for fishery-induced evolution of life history traits is an important but unresolved issue exploited fish populations. Because fisheries tend to select and remove the largest individuals, there evolutionary potential lasting effects on production productivity. Size selection represents indirect mechanism against rapid growth rate, because individual may be large or slow old age. direct whereby fast-growing genotypes are more vulnerable fishing irrespective their size,...

Consistent individual differences in behaviour, termed personality, are common animal populations and can constrain their responses to ecological environmental variation, such as temperature. Here, we show for the first time that normal within-daytime fluctuations temperature of less than 3°C have large effects on personality two species juvenile coral reef fish both observational manipulative experiments. On average, scores three traits (PTs), activity, boldness aggressiveness, increased...

Domesticated (farm) salmonid fishes display an increased willingness to accept risk while foraging, and achieve high growth rates not observed in nature. Theory predicts that elevated domestic salmonids will result greater risk-taking access abundant food, but low survival the presence of predators. In replicated whole-lake experiments, we trout (selected for rates) took risks foraging grew faster than a wild strain. However, consequences depended upon predation environment. Domestic...

In this study we identify the size-dependent risk of winter starvation mortality as a strong selective pressure on age-0 rainbow trout (Oncorhynchus mykiss) that could promote risk-taking behaviour and allocation energy to lipids previously observed in young cohorts. Age-0 subjected simulated conditions gradually depleted lipid reserves critical minimum content below which death occurred. Small fish with lower exhausted earlier, experienced high rates sooner, than larger greater content....

Summary The importance of body size and growth rate in ecological interactions is widely recognized, both are frequently used as surrogates for fitness. However, if there significant costs associated with rapid rates then its fitness benefits may be questioned. In replicated whole‐lake experiments, we show that a domestic strain rainbow trout (artificially selected maximum intrinsic rate) use productive but risky habitats more than wild trout. Consequently, grow faster all situations,...

Although animal behavior is generally repeatable, most behavioral variation apparently occurs within rather than across individuals. With the exception of very recent interest in individual plasticity (consistent differences responsiveness), this within-individual has been largely ignored despite its importance study proximate and ultimate questions about behavior. Here, we repeatedly scored undisturbed activity 30 adult male mosquitofish multiple observation bouts spanning 132 days...

Abstract A common method to assess behavioral types in personality research involves the use of a single emergence test (employed by researchers working on fish, avian, mammal, amphibian, and invertebrate taxa), whereby shorter latency emerge from holding container into novel environment is inferred represent greater ‘boldness’. Although any behavior might be context specific, studies using this assay type must assume it reflects boldness other similar contexts, otherwise cannot reflect...

Recent research suggests that the behavior of individuals under risk predation could be a key link between individual and population community dynamics. Yet existing theory remains largely untested at large spatial temporal scales. We manipulated food available to age-0 rainbow trout while cannibalism, in replicated factorial whole-lake experiment, test whether trade-off growth mortality rates is mediated by foraging activity young fish risk. found this exists for whole-system scale,...

Given limited food, prey fishes in a temperate climate must take risks to acquire sufficient reserves for winter and/or outgrow vulnerability predation. However, how can we distinguish which selective pressure promotes risk-taking when larger body size is always beneficial? To address this question, examined patterns of energy allocation populations age-0 trout determine if greater corresponds with lipids or somatic growth. Trout achieved maximum growth rates all lakes and allocated nearly...

The effects of climate change on plant and animal populations are widespread documented for many species in areas the world. However, projections impacts will require a better mechanistic understanding ecological behavioral responses to variation. For vertebrate animals, there is an absence whole-system manipulative experiments that express natural variation predator prey behaviors. Here we investigate effect elevated water temperature physiology, behavior, growth, survival fish multiple...

The evolutionary causes of consistent individual differences in behaviour are currently a source debate. A recent hypothesis suggests that life-history productivity (growth and/or fecundity) may covary with behavioural traits contribute to growth-mortality trade-offs, such as risk-proneness (boldness) and foraging activity (voraciousness). It remains unclear, however, what extent profiles set early life, or more flexible result specific environmental developmental contexts allow bold active...

Summary Standard metabolic rate ( SMR ) and maximal MMR are fundamental measures in ecology evolution because they set the scope within which animals can perform activities that directly affect fitness. In ectotherms, both repeatable over time when measured at a single ambient temperature T ). Many ectotherms encounter variable from day to their lifetime, yet it is currently unknown whether individual differences hold across an ecologically relevant range of (i.e. thermal repeatability; R...

Behavioral ecologists have hypothesized that among-individual differences in resting metabolic rate (RMR) may predict consistent individual mean values for costly behaviors or affect energy intake rate. This hypothesis has empirical support and presently attracts considerable attention, but, notably, it does not provide predictions (a) behavioral plasticity (b) unexplained variation (residual from behavior, here termed predictability). We outline how consideration of aerobic maximum (MMR)...

Wildlife is increasingly exposed to sublethal transient cancer risk factors, including mutagenic substances, which activates their anti-cancer defences, promotes tumourigenesis, and may negatively impact populations. Little known about how exposure factors impacts the behaviour of wildlife. Here, we investigated effects a sublethal, short-term carcinogen at environmentally relevant concentrations on activity patterns wild Girardia tigrina planaria during two-phase experiment, consisting...

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 384:231-239 (2009) - DOI: https://doi.org/10.3354/meps08057 Performance of tropical fish recruiting temperate habitats: role ambient temperature and implications climate change Will F. Figueira1,2,*, Peter Biro1, David J. Booth1, Vanessa C. Valenzuela1 1Department Environmental Sciences, University...