Fisheries-Induced Evolution

This chapter develops a basic evolutionary impact assessment of fishing. It does so by combining the size-based theory developed in chapters 3 and 4 with classic quantitative genetics. The impact assessment estimated the selection responses resulting from size-selective fishing on three main life-history traits: size at maturation, growth rate, and investment in reproduction. The predicted selection responses from a fishing mortality comparable to F msy are on the order of magnitude of 0.1 percent per year, smallest for size at maturation and largest for the investment in reproduction. The responses increase roughly proportional to the fishing mortality, so overfishing will not only result in depleted stocks and suboptimal yield production, but it will also lead to faster fisheries-induced evolution.

Erratum to: Life-history traits of Amur sleeper, Perccottus glenii, in the invaded Vistula River: early investment in reproduction but reduced growth rate

Hydrobiologia ◽

10.1007/s10750-011-0975-y ◽

2011 ◽

Vol 683 (1) ◽

pp. 311-311

Author(s):

Joanna Grabowska ◽

Dariusz Pietraszewski ◽

Mirosław Przybylski ◽

Ali Serhan Tarkan ◽

Lidia Marszał ◽

...

Keyword(s):

Growth Rate ◽

Life History ◽

Life History Traits ◽

Amur Sleeper ◽

Perccottus Glenii ◽

Vistula River ◽

Life-history traits of Amur sleeper, Perccottus glenii, in the invaded Vistula River: early investment in reproduction but reduced growth rate

Hydrobiologia ◽

10.1007/s10750-010-0524-0 ◽

2010 ◽

Vol 661 (1) ◽

pp. 197-210 ◽

Cited By ~ 20

Author(s):

Grabowska Joanna ◽

Pietraszewski Dariusz ◽

Przybylski Mirosław ◽

Tarkan Ali Serhan ◽

Marszał Lidia ◽

...

Keyword(s):

Growth Rate ◽

Life History ◽

Life History Traits ◽

Amur Sleeper ◽

Perccottus Glenii ◽

Vistula River ◽

Trait-Based Approach to Fish Ecology

Fish Ecology, Evolution, and Exploitation ◽

10.23943/princeton/9780691192956.003.0009 ◽

2019 ◽

pp. 150-160

Author(s):

Ken H. Andersen

Keyword(s):

Growth Rate ◽

Life History ◽

Life History Strategy ◽

Somatic Growth ◽

Population Level ◽

Historical Background ◽

Life History Strategies ◽

Asymptotic Size ◽

Current State ◽

This chapter proposes a shortlist of fish “master” traits and connects these traits to classic life-history strategy thinking. First, it sets the historical background for the current state-of-the-art thinking about fish life history strategies. From there, the chapter explains that the main axes of variation between fish species can be captured by three traits: the asymptotic size; the growth rate coefficient; and the adult–offspring mass ratio strategy. Together, these three traits determine the central demographic parameters: somatic growth rate, investment in reproduction, age at maturation, survival to maturation, mortality, and so on, and from there follows population-level quantities like population growth rate, population structure, fitness, and selection responses. The chapter concludes with a reflection on the trait-based approach and compares it to other methods of assessment.

Life history traits and fishing mortality estimations of Caspian vimba, Vimba vimba (L.), in southwestern coastal regions of the Caspian Sea

Archives of Polish Fisheries ◽

10.1515/aopf-2017-0014 ◽

2017 ◽

Vol 25 (3) ◽

pp. 145-155

Author(s):

Fateme Taridashti ◽

Javid Imanpour ◽

Shahram Abdolmalaki ◽

Mahvash Hadavi

Keyword(s):

Growth Rate ◽

Life History ◽

Caspian Sea ◽

Life History Traits ◽

Mortality Rates ◽

Fishing Mortality ◽

Coastal Regions ◽

The Caspian Sea ◽

Males And Females ◽

Existing Data

Abstract This study was conducted to complement existing data about the life cycle of Caspian vimba, Vimba vimba (L.), with estimations of age, growth, and mortality rates. To achieve this, 811 specimens were collected between May 2012 and June 2013 at three fisheries catch stations in southwestern regions of the Caspian Sea including Talesh, Bandar Anzali, and Kiashahr. The growth rate in vimba is relatively high at approximately 0.29 year−1 for females and 0.32 year−1 for males. Asymptotic lengths are 245 mm and 233 mm for females and males, respectively. The growth pattern was isometric for both males and females. The overall sex ratio was balanced (1: 0.92). The instantaneous coefficients of total, natural, and fishing mortality were 1.27, 0.4, and 0.8 year, respectively, and the current exploitation ratio was 0.63 year−1. Results showed that the growth rate of males is higher than that of females. Considering the exploitation ratio, it is apparent that the vimba population is experiencing significant legal and illegal exploitation pressure.

Modelling fishing-induced adaptations and consequences for natural mortality

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f10-049 ◽

2010 ◽

Vol 67 (7) ◽

pp. 1086-1097 ◽

Cited By ~ 43

Author(s):

Christian Jørgensen ◽

Øyvind Fiksen

Keyword(s):

Life History ◽

Body Size ◽

Life Histories ◽

Life History Traits ◽

Reproductive Behaviour ◽

Natural Mortality ◽

Fishing Mortality ◽

Trade Offs ◽

Wide Range ◽

When trade-offs involving predation and mortality are perturbed by human activities, behaviour and life histories are expected to change, with consequences for natural mortality rates. We present a general life history model for fish in which three common relationships link natural mortality to life history traits and behaviour. First, survival increases with body size. Second, survival declines with growth rate due to risks involved with resource acquisition and allocation. Third, fish that invest heavily in reproduction suffer from decreased survival due to costly reproductive behaviour or morphology that makes escapes from predators less successful. The model predicts increased natural mortality rate as an adaptive response to harvesting. This extends previous models that have shown that harvesting may cause smaller body size, higher growth rates, and higher investment in reproduction. The predicted increase in natural mortality is roughly half the fishing mortality over a wide range of harvest levels and parameter combinations such that fishing two fish kills three after evolutionary adaptations have taken place.

Delayed maturity does not offset negative impact afflicted by ectoparasitism in salmon

Theoretical Ecology ◽

10.1007/s12080-021-00506-w ◽

2021 ◽

Author(s):

Knut Wiik Vollset ◽

Martin Krkosek

Keyword(s):

Growth Rate ◽

Life History ◽

Body Size ◽

Population Growth ◽

Population Growth Rate ◽

Negative Impact ◽

Host Population ◽

Sea Lice ◽

Fish Farms ◽

AbstractThe negative effects of parasitism on host population dynamics may be mediated by plastic compensatory life-history changes in hosts. Theory predicts that hosts should shift their life-history towards early reproduction in response to virulent pathogens to maximize reproduction before death. However, for sublethal infections that affect growth, hosts whose fecundity is correlated with body size are predicted to shift towards delayed reproduction associated with larger body size and higher fecundity. This has been observed in Atlantic salmon and parasitic sea lice, via mark-recapture studies that recover mature fish from paired groups of control and parasiticide-treated smolts. We investigated whether such louse-induced changes to age at maturity can offset some of the negative effect of mortality on population growth rate in salmon using a structured population matrix model. Model results show that delayed maturity can partially compensate for reduced survival. However, this only occurs when marine survival is moderate to poor and growth conditions at sea are good. Also, the impact of delayed maturity on population growth when parameterizing the model with empirical data is negligible compared with effects of direct mortality. Our model thus suggests that management that works on minimizing the effect of sea lice from fish farms on wild salmon should focus mainly on correctly quantifying the effect of parasite-induced mortality during the smolt stage if the goal is to maximize population growth rate.

Evolutionary impact assessment of the North Sea plaice fishery

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/cjfas-2014-0568 ◽

2016 ◽

Vol 73 (7) ◽

pp. 1126-1137 ◽

Cited By ~ 12

Author(s):

Fabian M. Mollet ◽

Jan Jaap Poos ◽

Ulf Dieckmann ◽

Adriaan D. Rijnsdorp

Keyword(s):

Life History ◽

North Sea ◽

Life History Traits ◽

Maximum Yield ◽

Fishing Effort ◽

Reference Points ◽

Fishing Mortality ◽

Management Scenarios ◽

Evolutionary Response ◽

There is growing evidence that fishing causes evolution in life-history traits that affect the productivity of fish stocks. Here we explore the impact of fisheries-induced evolution (FIE) on the productivity of North Sea plaice (Pleuronectes platessa) using an ecogenetic, individual-based model by comparing management scenarios with and without an evolutionary response. Under status-quo management, plaice evolve towards smaller size at age, earlier maturation, and higher reproductive investment. Current reference points of maximum sustainable yield (MSY) and corresponding fishing-mortality rate (FMSY) that ignore FIE will decrease and cannot be considered sustainable. The nature and extent of the change through FIE depend on fishing effort and selectivity. The adverse evolutionary effects can be reduced — and even reversed — by implementing a dome-shaped exploitation pattern protecting the large fish. The evolutionarily sustainable maximum yield can be obtained by combining such a dome-shaped exploitation pattern with a reduction in fishing mortality and an increase in mesh size; it is similar to the MSY that would apply if life-history traits were static. Fisheries managers will need to trade off the short-term loss in yield associated with evolutionarily informed management with the long-term loss in yield FIE causes under evolutionarily uninformed management.

International trade: Research of the reasons for the fall

Voprosy Ekonomiki ◽

10.32609/0042-8736-2019-1-79-91 ◽

2019 ◽

pp. 79-91 ◽

Cited By ~ 2

Author(s):

V. S. Nazarov ◽

S. S. Lazaryan ◽

I. V. Nikonov ◽

A. I. Votinov

Keyword(s):

Growth Rate ◽

International Trade ◽

Exchange Rate ◽

Global Economy ◽

Structural Changes ◽

Global Value Chains ◽

Value Chains ◽

Negative Contribution ◽

Basic Commodity ◽

The article assesses the impact of various factors on the growth rate of international trade. Many experts interpreted the cross-border flows of goods decline against the backdrop of a growing global economy as an alarming sign that indicates a slowdown in the processes of globalization. To determine the reasons for the dynamics of international trade, the decompositions of its growth rate were carried out and allowed to single out the effect of the dollar exchange rate, the commodities prices and global value chains on the change in the volume of trade. As a result, it was discovered that the most part of the dynamics of international trade is due to fluctuations in the exchange rate of the dollar and prices for basic commodity groups. The negative contribution of trade within global value chains in 2014 was also revealed. During the investigated period (2000—2014), such a picture was observed only in the crisis periods, which may indicate the beginning of structural changes in the world trade.