Measuring Probabilistic Reaction Norms for Age and Size at Maturation

Heino, Mikko; Dieckmann, Ulf; Godø, Olav Rune

doi:10.1111/j.0014-3820.2002.tb01378.x

Cited by 244 publications

(177 citation statements)

References 23 publications

Supporting

Mentioning

176

Contrasting

Unclassified

Order By: Relevance

“…Specifically, intensive harvesting on the age groups where maturation tend to occur will select for an earlier onset of maturation (Law 2000;Heino and Godø 2002;Ernande et al 2004). Based on the available age, length and maturity data (see Fig.…”

Section: Discussionmentioning

confidence: 99%

Fitness landscape of Atlantic cod shaped by harvest selection and natural selection

Olsen

Moland

2010

Evol Ecol

View full text Add to dashboard Cite

Harvesting may lead to evolutionary changes in life histories on a contemporary time scale, changes that could be maladaptive in natural contexts. However, our understanding of the strength and direction of harvest-induced selection versus natural selection is still limited, partly due to the difficulty of tracking the fate of individuals in the wild. Here, we present direct estimates of harvest mortality, natural mortality and site fidelity of coastal Atlantic cod (Gadus morhua) from the Norwegian Skagerrak coast. Furthermore, we present standardised selection differentials for fish body size. Estimates are obtained from acoustic telemetry, where we continuously monitored fish (n = 60) within a semi-sheltered area using a network of 25 listening stations. To obtain additional information about harvested cod, all fish (body size: 30-66 cm) were also tagged with traditional T-bar tags with a printed reward of 500 NOK (60 E). We estimate that 75% of the fish died within the study area during 1 year. Fishing mortality was markedly higher than natural mortality. Together, recreational fishers and commercial fishers caught at least 50% of the tagged fish during 1 year. Standardised selection differentials showed that fisheries targeted larger fish (i.e. favoured the survival of smaller fish), while natural selection favoured the survival of larger fish. Albeit on a small scale, we provide empirical evidence that harvesting can have a dominant influence on the fitness landscape experienced by a marine fish such as the Atlantic cod. We suggest that no-take marine reserves may help to counter evolutionary impacts of harvesting in the ocean.

show abstract

Section: Discussionmentioning

confidence: 99%

Fitness landscape of Atlantic cod shaped by harvest selection and natural selection

Olsen

Moland

2010

Evol Ecol

View full text Add to dashboard Cite

show abstract

“…An extension of the MRN concept involves accounting for the inherent between‐individual variability in the timing of maturation by describing it as probabilistic. A pMRN describes the probability that an immature individual of a given age and size will mature in the following growing season (Heino, Dieckmann, & Godø, 2002). The pMRN shows the age‐specific maturation thresholds (i.e., the maturation rules) and can also be shown on a bivariate plot of size versus age.…”

Section: Methodsmentioning

confidence: 99%

Size‐selective fishing and the potential for fisheries‐induced evolution in lake whitefish

Morbey

Mema

2018

Evolutionary Applications

View full text Add to dashboard Cite

The long‐term evolutionary effects of fishing on maturation schedules can depend on gear type, the shape of the gear type's size‐selectivity function, and the size and age structure of a population. Our goal was to better understand how environmentally induced differences in somatic growth influence the evolutionary effects of size‐selective fisheries, using lake whitefish (Coregonus clupeaformis) in Lake Huron as a case study. Using a state‐dependent optimization model of energy allocation parameterized for lake whitefish, we show that fishing with gill nets (bell‐shaped selectivity) and trap nets (sigmoid‐shaped selectivity) can be potent agents of selection on size thresholds for maturity. Compared to trap nets and large mesh (114 mm) gill nets, small mesh (89 mm) gill nets are better able to buffer populations from fishing‐induced evolution by safeguarding large, fecund fish, but only when overall fishing mortality is low and growth rates sufficiently fast such that fish can outgrow vulnerable size classes. Regardless of gear type, and all else being equal, high fishing mortality in combination with low growth rates is expected to intensify the long‐term evolutionary effects of fishing.

show abstract

“…For example, in ungulates, both high adult female mortality and greater resource abundance are expected to lead to earlier primiparity [16][17][18]. If hunting increases female mortality and lowers population density, its evolutionary and ecological effects will be confused [19]. Harvest-induced evolution has important applied implications, and is a controversial subject.…”

Section: Introductionmentioning

confidence: 99%

Harvest-induced evolution: insights from aquatic and terrestrial systems

Kuparinen

Festa‐Bianchet

2017

Phil. Trans. R. Soc. B

113

View full text Add to dashboard Cite

One contribution of 18 to a theme issue 'Human influences on evolution, and the ecological and societal consequences'. Commercial and recreational harvests create selection pressures for fitnessrelated phenotypic traits that are partly under genetic control. Consequently, harvesting can drive evolution in targeted traits. However, the quantification of harvest-induced evolutionary life history and phenotypic changes is challenging, because both density-dependent feedback and environmental changes may also affect these changes through phenotypic plasticity. Here, we synthesize current knowledge and uncertainties on six key points: (i) whether or not harvest-induced evolution is happening, (ii) whether or not it is beneficial, (iii) how it shapes biological systems, (iv) how it could be avoided, (v) its importance relative to other drivers of phenotypic changes, and (vi) whether or not it should be explicitly accounted for in management. We do this by reviewing findings from aquatic systems exposed to fishing and terrestrial systems targeted by hunting. Evidence from aquatic systems emphasizes evolutionary effects on age and size at maturity, while in terrestrial systems changes are seen in weapon size and date of parturition. We suggest that while harvest-induced evolution is likely to occur and negatively affect populations, the rate of evolutionary changes and their ecological implications can be managed efficiently by simply reducing harvest intensity.This article is part of the themed issue 'Human influences on evolution, and the ecological and societal consequences'.

show abstract

Measuring Probabilistic Reaction Norms for Age and Size at Maturation

Cited by 244 publications

References 23 publications

Fitness landscape of Atlantic cod shaped by harvest selection and natural selection

Fitness landscape of Atlantic cod shaped by harvest selection and natural selection

Size‐selective fishing and the potential for fisheries‐induced evolution in lake whitefish

Harvest-induced evolution: insights from aquatic and terrestrial systems

Contact Info

Product

Resources

About