scholarly journals Revisiting the concept of Beverton­­–Holt life-history invariants with the aim of informing data-poor fisheries assessment

2014 ◽  
Vol 72 (1) ◽  
pp. 194-203 ◽  
Author(s):  
Jeremy Prince ◽  
Adrian Hordyk ◽  
Sarah R. Valencia ◽  
Neil Loneragan ◽  
Keith Sainsbury
Keyword(s):  
Life History ◽  
Meta Analysis ◽  
Reproductive Potential ◽  
Life History Strategy ◽  
Marine Species ◽  
Small Scale ◽  
Implicit Assumption ◽  
Fish Stocks ◽  
Assessment Techniques ◽  
The Relationship

Abstract The complexity and cost of assessment techniques prohibits their application to 90% of fisheries. Simple generic approaches are needed for the world's small-scale and data-poor fisheries. This meta-analysis of the relationship between spawning potential and the normalized size and age of 123 marine species suggests that the so-called Beverton–Holt life-history invariants (BH-LHI; Lm/L∞, M/k, M × Agem) actually vary together in relation to life-history strategy, determining the relationship between size, age, and reproductive potential for each species. Although little realized, the common assumption of unique values for the BH-LHI also implies that all species share the same relationship between size, age, and reproductive potential. This implicit assumption is not supported by this meta-analysis, which suggests that there is considerable but predictable natural variation in the BH-LHI ratios and the relationships between size, age, and reproductive potential that they determine. We believe that this reconceptualization of the BH-LHI has potential to provide a theoretical framework for “borrowing” knowledge from well-studied species to apply to related, unstudied species and populations, and when applied together with the assessment technique described by Hordyk et al. (2015b), could make simple forms of size-based assessment possible for many currently unassessable fish stocks.

scholarly journals Evidence for harvest-induced maternal influences on the reproductive rates of fish populations

2008 ◽  
Vol 276 (1658) ◽  
pp. 919-924 ◽  
Author(s):  
Paul A Venturelli ◽  
Brian J Shuter ◽  
Cheryl A Murphy
Keyword(s):  
Age Structure ◽  
Time Series Data ◽  
Meta Analysis ◽  
Reproductive Rate ◽  
Series Data ◽  
Small Scale ◽  
Fish Stocks ◽  
Reproductive Rates ◽  
The Relationship ◽  
Maternal Quality

Knowledge of the relationship between the number of offspring produced (recruitment) and adult abundance is fundamental to forecasting the dynamics of an exploited population. Although small-scale experiments have documented the importance of maternal quality to offspring survival in plants and animals, the effects of this association on the recruitment dynamics of exploited populations are largely unknown. Here, we present results from both a simple population model and a meta-analysis of time-series data from 25 species of exploited marine fishes that suggest that a population of older, larger individuals has a higher maximum reproductive rate than an equivalent population of younger, smaller individuals, and that this difference increases with the reproductive lifespan of the population. These findings (i) establish an empirical link between population age structure and reproductive rate that is consistent with strong effects of maternal quality on population dynamics and (ii) provide further evidence that extended age structure is essential to the sustainability of many exploited fish stocks.

scholarly journals Reproductive Strategy and Sexual Conflict Slow Life History Strategy Inihibts Negative Androcentrism

2013 ◽  
Vol 4 (1) ◽  
pp. 48 ◽  
Author(s):  
Paul R. Gladden ◽  
Aurelio José Figueredo ◽  
D. J. Andrejzak ◽  
Dan Nelson Jones ◽  
Vanessa Smith-Castro
Keyword(s):  
Emotional Intelligence ◽  
Life History ◽  
Executive Functioning ◽  
Structural Model ◽  
Life History Strategy ◽  
Attitudes Toward Women ◽  
Negative Attitudes ◽  
Biological Sex ◽  
Generative Theory ◽  
The Relationship

Recent findings indicate that a slow Life History (LH) strategy factor is associated with increased levels of Executive Functioning (EF), increased emotional intelligence, decreased levels of sexually coercive behaviors, and decreased levels of negative ethnocentrism. Based on these findings, as well as the generative theory, we predicted that slow LH strategy should inhibit negative androcentrism (bias against women). A sample of undergraduates responded to a battery of questionnaires measuring various facets of their LH Strategy, (e.g., sociosexual orientation, mating effort, mate-value, psychopathy, executive functioning, and emotional intelligence) and various convergent measures of Negative Androcentrism. A structural model that the data fit well indicated a latent protective LH strategy trait predicted decreased negative androcentrism. This trait fully mediated the relationship between participant biological sex and androcentrism. We suggest that slow LH strategy may inhibit negative attitudes toward women because of relatively decreased intrasexual competition and intersexual conflict among slow LH strategists. DOI:10.2458/azu_jmmss_v4i1_gladden

scholarly journals Reproductive strategy of common dentex Dentex dentex: management implications

2016 ◽  
Vol 17 (2) ◽  
pp. 552 ◽  
Author(s):  
A. GRAU ◽  
F. SABORIDO-REY ◽  
E. PASTOR ◽  
M. PALMER ◽  
E. MASSUTÍ-PASCUAL ◽  
...  
Keyword(s):  
Sex Differences ◽  
Life History ◽  
Reproductive Strategy ◽  
Egg Production ◽  
Gonadosomatic Index ◽  
Life History Strategy ◽  
Minimum Size ◽  
Small Scale ◽  
Female Size ◽  
Dentex Dentex

Common dentex Dentex dentex is an iconic endangered species in the Mediterranean where is a sought after target species for small-scale, recreational and spearfishing fisheries. The reproductive biology of D. dentex in the natural environment is poorly known; therefore the reproductive strategy of the species was assessed by combining reproductive traits with the growth characteristics (estimated from length-at-age data), the size/age of sexual maturity and the energetic dynamics. A total of 358 wild fish were sampled on Mallorca Island (W Mediterranean) from March 1996 to June 1999 with a 19 to 84.7 cm total length (LT) range. The sex ratio was skewed towards females (1.361) albeit the length composition was not different between sexes (p = 0.551). Three young immature individuals (< 28 cm LT, 0.8% individuals) were rudimentary hermaphrodites supporting the late gonochoristic species classification. The age composition determined from sagitta otolith interpretation ranged from 0 to 26 years (yr). Concerning growth, between sex differences in von Bertalanffy parameters were not relevant, even after accounting for potential between-year differences. The most noticeable difference was found for L∞ (64.7 cm for females versus 61.6 for males) but even in this case, the bayesian credibility interval of between-sex differences included zero.  Maturity ogives at size and age showed that females achieved 50% maturity at 34.9 cm LT and 3.3 years, while males did at 33.8 cm LT and 2.5 years. The onset of gonad developing phase took place in December, while it progresses until April. The spawning peak was in April and May for both sexes. A generalized linear model showed that female size didn’t affect significantly the spawning season, whilst there was a strong seasonality in the spawning. Most of the evidences showed that fecundity is likely determinate, with an asynchronous oocyte development before spawning and a clear ovarian bimodal organization after the onset of spawning. Female weight explained 84% of the observed variance for fecundity. The gonadosomatic, hepatosomatic and condition indexes varied significantly with the reproductive season for females and only the gonadosomatic index for males. Storage in muscle seemed to be the primary source of energy for reproduction, although liver appeared to play a short-term role in egg production, suggesting a combination of capital and income breeding. The results indicate that the life history strategy of common dentex possess consist on maturing well before reaching maximum size, investing in growth after maturation, and therefore the reproductive effort is distributed through a longer lifespan and related with the size attained after maturation. At present no management measures are directed to D. dentex; given its life history strategy we suggest that a slot limit should be implemented, i.e. a minimum and a maximum landing size, with a minimum size of 35 cm. The upper threshold, to protect the higher reproductive potential of older and larger fish, should still be defined.

scholarly journals Life History Strategy and Overeating During COVID-19 Pandemic: a Moderated Mediation Model of Sense of Control and Coronavirus Stress

2021 ◽  
Author(s):  
Baojuan Ye ◽  
Ruining Wang ◽  
Mingfan Liu ◽  
Xinqiang Wang ◽  
Qiang Yang
Keyword(s):  
College Students ◽  
Life History ◽  
Life History Strategy ◽  
Empirical Support ◽  
Moderated Mediation ◽  
Mediating Effect ◽  
Sense Of Control ◽  
Chinese College Students ◽  
Moderated Mediation Model ◽  
The Relationship

Abstract Background: This study examined the mediating effect of sense of control and the moderating effect of coronavirus stress on the relationship between life history strategy and overeating among Chinese college students during the COVID-19 period. Methods: Thirty-three hundred and ten Chinese students (Mage = 19.74, SD = 1.50; 47% males) completed self-reported questionnaires regarding life history strategy, sense of control, overeating, and coronavirus stress. The data were analyzed using Pearson’s r correlations and moderated mediation analysis. Results: The results revealed that control sense mediated the link between life history strategy and college students’ overeating. College students’ coronavirus stress moderated the associations between life history strategy and college students’ sense of control and between control sense and overeating. The association between life history strategy and sense of control was stronger for those with lower coronavirus stress, and the association between sense of control and overeating was stronger for those with lower coronavirus stress. Conclusions: This study identified the critical factors associated with overeating; it supplies empirical support for existing theories and provides practical implications for interventions aiming to decrease Chinese college students’ overeating during COVID-19 period.

scholarly journals Reproductive Strategy and Sexual Conflict Slow Life History Strategy Inihibts Negative Androcentrism

2013 ◽  
Vol 4 (1) ◽  
pp. 48 ◽  
Author(s):  
Paul R. Gladden ◽  
Aurelio José Figueredo ◽  
D. J. Andrejzak ◽  
Dan Nelson Jones ◽  
Vanessa Smith-Castro
Keyword(s):  
Emotional Intelligence ◽  
Life History ◽  
Executive Functioning ◽  
Structural Model ◽  
Life History Strategy ◽  
Attitudes Toward Women ◽  
Negative Attitudes ◽  
Biological Sex ◽  
Generative Theory ◽  
The Relationship

Recent findings indicate that a slow Life History (LH) strategy factor is associated with increased levels of Executive Functioning (EF), increased emotional intelligence, decreased levels of sexually coercive behaviors, and decreased levels of negative ethnocentrism. Based on these findings, as well as the generative theory, we predicted that slow LH strategy should inhibit negative androcentrism (bias against women). A sample of undergraduates responded to a battery of questionnaires measuring various facets of their LH Strategy, (e.g., sociosexual orientation, mating effort, mate-value, psychopathy, executive functioning, and emotional intelligence) and various convergent measures of Negative Androcentrism. A structural model that the data fit well indicated a latent protective LH strategy trait predicted decreased negative androcentrism. This trait fully mediated the relationship between participant biological sex and androcentrism. We suggest that slow LH strategy may inhibit negative attitudes toward women because of relatively decreased intrasexual competition and intersexual conflict among slow LH strategists. DOI:10.2458/azu_jmmss_v4i1_gladden

The Stock Concept, Discreteness of Fish Stocks, and Fisheries Management

1981 ◽  
Vol 38 (12) ◽  
pp. 1889-1898 ◽  
Author(s):  
J. A. MacLean ◽  
D. O. Evans
Keyword(s):  
Life History ◽  
Gene Flow ◽  
Fisheries Management ◽  
Life History Strategy ◽  
Stock Management ◽  
Fish Stocks ◽  
Local Populations ◽  
Subdivided Populations ◽  
Definition Of ◽  
Adaptive Nature

This paper examines the concept and definition of fish stocks and the processes that influence discreteness of these stocks in light of the tactics necessary for the application of the concept in management. Two approaches to the definition of stocks are discussed. These differ in the extent to which management inputs other than biological ones are considered. We consider definition to be less important than the adoption and development of a stock concept to provide a genetic perspective for fisheries management. The two central levels of the stock concept — the subdivision of species into local populations and the adaptive nature of genetic differences between these populations — are discussed with respect to the interlinked set of ecological and genetic processes that result in subdivision and determine the discreteness of these stocks. Genetic discreteness usually implies some restriction of gene flow, and spatial and temporal mechanisms of isolation are discussed with examples from the STOCS symposium. The structure of subdivided populations is seen as the result of behavioral processes that are one component of a set of coadapted traits, which collectively constitute a life history strategy. The necessity for managers to develop a new integrated view of species, which incorporates both ecological and genetic arguments, is discussed.Key words: stock concept, life history, gene flow, ecological and genetic discreteness, local adaptation stock management

scholarly journals The Relationship between the Family Functioning of Individuals with Drug Addiction and Relapse Tendency: A Moderated Mediation Model

2021 ◽  
Vol 18 (2) ◽  
pp. 625
Author(s):  
Xiaoqing Zeng ◽  
Chuyi Tan
Keyword(s):  
Life History ◽  
Family Functioning ◽  
Drug Addiction ◽  
Addiction Treatment ◽  
Psychological Capital ◽  
Life History Strategy ◽  
Mediating Effect ◽  
The Family ◽  
The Relationship ◽  
Drug Relapse

To explore the relationship between family functioning, psychological capital, life history strategy, and relapse tendency of individuals with drug addiction, 842 individuals with drug addiction completed a questionnaire. The results showed that (1) there was a significant negative correlation between the family functioning of individuals with drug addiction and their relapse tendency; (2) psychological capital played an intermediary role between family functioning and relapse tendency; and (3) life history strategy regulated the mediating effect of psychological capital. The results of this study suggest that family members should collaborate with drug addiction treatment centers and participate in the education and treatment process to help reduce drug relapse tendency. Increasing the psychological capital and self-efficacy of individuals with drug addiction through group psychological counseling and psychological education courses could also reduce drug relapse tendency.

scholarly journals Differing Life-History Strategies of Two Mycoheterotrophic Orchid Species Associated with Leaf Litter- and Wood-Decaying Fungi

Diversity ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 161
Author(s):  
Yuki Ogura-Tsujita ◽  
Kenshi Tetsuka ◽  
Shuichiro Tagane ◽  
Miho Kubota ◽  
Shuichiro Anan ◽  
...  
Keyword(s):  
Life History ◽  
Leaf Litter ◽  
Mycorrhizal Fungi ◽  
Life History Strategy ◽  
Life History Strategies ◽  
Small Scale ◽  
Nutrient Depletion ◽  
Saprotrophic Fungi ◽  
Orchid Species ◽  
Mycoheterotrophic Plants

Mycoheterotrophic orchids depend completely on mycorrhizal fungi for their supply of carbon. The life-history traits of mycoheterotrophic plants (MHPs) can differ according to the characteristics of the associated mycorrhizal fungi. We compared the life-history strategies of two mycoheterotrophic orchids associated with wood- and leaf litter-decaying fungi over a maximum of six years of field monitoring. Seventy percent of the aboveground stems of Erythrorchis altissima, associated with wood-decaying fungi, disappeared from the host wood within two years after tagging, likely due to nutrient depletion. In contrast, Gastrodia confusa, associated with leaf litter-decaying fungi, occurred continuously (18 to 108 fruiting stalks) every year within a small-scale plot (12 × 45 m) for six years through seed and clonal propagation. Our results support the idea that mycoheterotrophic orchids associated with wood-decaying fungi disappear from their habitats due to nutrient depletion after their host wood has mostly decayed, while mycoheterotrophic orchids associated with leaf litter-decaying fungi can survive in small-scale habitats where substantial leaf fall regularly occurs to sustain the associated fungi. Our study provides basic information about a unique life-history strategy in MHPs associated with saprotrophic fungi and an understanding of the variation in life-history strategies among MHPs.

Variation in Women’s Mate Preferences Over the Development of a Monogamous Relationship Corresponds with Changes in Men’s Life History Strategy (Author's Accepted Version)

2019 ◽  
Author(s):  
Rebecca Owens ◽  
Helen Driscoll ◽  
Daniel Farrelly
Keyword(s):  
Life History ◽  
Life History Theory ◽  
Life History Strategy ◽  
Mate Preferences ◽  
Mating Strategies ◽  
Mating Effort ◽  
Monogamous Relationship ◽  
Parenting Effort ◽  
The Relationship

Much research has examined how men’s mating strategies change over the development of a relationship consistent with predictions from Life History Theory. Specifically, research shows both physiological and behavioural indicators of mating effort decrease once men are mated, and further once they become fathers, unless they remain engaged in mating effort. This switch from mating to parenting effort is sexually selected, and therefore the corresponding shifts in women should be examined, though to date, women’s short- or long-term mate preferences have been studied as separate entities rather than as a transition from short- to long- term. We examined how women’s mate preferences changed over the development of a relationship, to see if they varied consistently with what is known about variation in men’s mating effort. Vignettes detailed four key milestones in the development of a relationship and women rated the importance of the man at each stage displaying indicators of mating or parenting effort. Women increasingly prioritised indicators of parenting effort in men as the relationship developed, consistent with what is known about men’s reduction in mating effort in favour of parenting effort over the development of a relationship. The results support predictions from Life History Theory and highlight the interacting mutually reinforcing nature of sexually selected behaviours.

Sign in / Sign up

Export Citation Format

Share Document