Age and growth of the sharpsnout seabream Diplodus puntazzo (Cetti, 1777) inhabiting the Canarian archipelago, estimated by reading otoliths and by backcalculation

Domínguez-Seoane, Rosa; Pajuelo, José G.; Nespereira, José María Lorenzo; Ramos, Antonio G.

doi:10.1016/j.fishres.2006.08.001

Cited by 16 publications

(8 citation statements)

References 18 publications

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“…The transitional individuals are mainly between 260 and 380 mm in length, indicating that sexual succession takes place mainly between the second and the fourth years of life (Domínguez‐Seoane et al., 2006). No transitional individuals were observed by Micale et al.…”

Section: Discussionmentioning

confidence: 99%

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Gonadal development and spawning cycle in the digynic hermaphrodite sharpsnout seabream Diplodus puntazzo (Sparidae) off the Canary Islands, northwest of Africa

2007

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SummaryDiplodus puntazzo is a species characterized by a rudimentary hermaphroditism, with a low level of protandry. The study found that the overall sex ratio was one male to 2.03 females, diverging significantly from 1 : 1, and that there was a ratio of one male to 0.11 transitional fish. The sex ratio varied with season: during the reproductive period the ratio was 1 : 1.86 (male : female), significantly lower than in the non-reproductive period in which the sex ratio was approximately 1 : 2.26. Both sexes had similar size distributions; however, females were predominant in all size intervals, especially in the larger ones. No significant difference in mean total length (TL) between females (330 mm), males (319 mm) or transitionals (321 mm) was found. The smallest functional female and male analysed were 159 and 157 mm TL, and the largest were 520 and 510 mm TL, respectively. No significant difference in length at first level of maturity, attained at the second year of life, was found between males (281 mm) and females (292 mm), respectively. A protracted spawning season was identified for the species:

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Section: Discussionmentioning

confidence: 99%

“…Micale et al (1996) found that D. puntazzo is an ambisexual species. Other data on biological aspects of this species concerning the age and growth (Domı´nguez-Seoane et al, 2006) and feeding (Atienza et al, 2004) have been published.…”

Section: Introductionmentioning

confidence: 99%

Gonadal development and spawning cycle in the digynic hermaphrodite sharpsnout seabream Diplodus puntazzo (Sparidae) off the Canary Islands, northwest of Africa

2007

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“…We estimated adult body size as the median of all L inf values reported for each species in the online database Fishbase (Froese et al, 2000). As L inf was not documented in Fishbase for D. puntazzo and C. galerita, we took the median of the values reported in (Kraljević et al, 2007) and (Domínguez-Seoane et al, 2006) for D. puntazzo, and the maximum length observed in (Milton, 1983) For all species of this study, this corresponded to egg diameter, except for brooders, for which we used hatching size. All propagule size data were retrieved from species-specific references.…”

Section: Life History Traits Databasementioning

confidence: 99%

Age-specific survivorship and fecundity shape genetic diversity in marine fishes

Barry

Broquet

Gagnaire

2020

Preprint

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Genetic diversity varies among species due to a range of eco-evolutionary processes that are not fully understood. The neutral theory predicts that the amount of variation in the genome sequence between different individuals of the same species should increase with its effective population size (Ne). In real populations, multiple factors that modulate the variance in reproductive success among individuals cause Ne to differ from the total number of individuals (N). Among these, age-specific mortality and fecundity rates are known to have a direct impact on the ratio. However, the extent to which vital rates account for differences in genetic diversity among species remains unknown. Here, we addressed this question by comparing genome-wide genetic diversity across 16 marine fish species with similar geographic distributions but contrasted lifespan and age-specific survivorship and fecundity curves. We sequenced the whole genome of 300 individuals to high coverage and assessed their genome-wide heterozygosity with a reference-free approach. Individual genome-wide heterozygosity varied from 0.2 to 1.4%, and adult lifespan was by far the most significant predictor of genetic diversity, with a large negative effect (slope = −0.089 per additionnal year of lifespan) that was further increased when brooding species providing intense parental care were removed from the dataset (slope = −0.129 per additionnal year of lifespan). Using published vital rates for each species, we showed that the ratio only generated by life tables predict the observed differences in genetic diversity among species. We further found that the extent of reduction in with increasing adult lifespan is particularly strong under Type III survivorship curves (high juvenile and low adult mortality) and increasing fecundity with age, which is typical of marine fish. Our study highlights the importance of vital rates in the evolution of genetic diversity within species in nature.Author SummaryUnderstanding how and why genetic diversity varies across species has important implications for evolutionary and conservation biology. Although genomics has vastly improved our ability to document intraspecific DNA sequence variation at the genome level, the range and determinants of genetic diversity remain partially understood. At a broad taxonomic scale in eukaryotes, the main determinants of diversity are reproductive strategies distributed along a trade-off between the quantity and the size of offspring, which likely affect the long-term effective population size. Long-lived species also tend to show lower genetic diversity, a result which has however not been reported by comparative studies of genetic diversity at lower taxonomic scales. Here, we compared genetic diversity across 16 European marine fish species showing marked differences in longevity. Adult lifespan was the best predictor of genetic diversity, with genome-wide average heterozygosity ranging from 0.2% in the black anglerfish to 1.4% in the European pilchard. Using life tables summarizing age-specific mortality and fecundity rates for each species, we showed that the variance in lifetime reproductive success resulting from age structure, iteroparity and overlapping generations can predict the range of observed differences in genetic diversity among marine fish species. We then used computer simulations to explore how combinations of vital rates characterizing different life histories affect the relationship between adult lifespan and genetic diversity. We found that marine fishes that display high juvenile but low adult mortality, and increasing fecundity with age, are typically expected to show reduced genetic diversity with increased adult lifespan. However, the impact of adult lifespan vanished using bird and mammal-like vital rates. Our study shows that variance in lifetime reproductive success can have a major impact on a species’ genetic diversity and explains why this effect varies widely across taxonomic groups.

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“…This function has only three parameters, making it statistically robust compared with models with more parameters (Booth, 1997), and its parameters are commonly used in mortality estimates and fisheries stock assessment modeling (Domínguez et al, 2006). This model was chosen as the most appropriate model for the data based on the comparison of the AIC.…”

Section: Discussionmentioning

confidence: 99%

“…This approach avoids any potential bias in growth estimates due to the difference in sampling dates (Domínguez et al, 2006). Thus, the age for adults caught before and after 1 April was calculated, respectively, as follows:…”

Section: Sampling and Age Determinationmentioning

confidence: 99%

Age and growth of chub mackerel (Xcomber japonicus) in the East China and Yellow Seas using sectioned otolith samples

Chen

Feng

2008

J. Ocean Univ. China

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Although chub mackerel (Scomber japonicus) is a primary pelagic fish species, we have only limited knowledge on its key life history processes. The present work studied the age and growth of chub mackerel in the East China and Yellow Seas. Age was determined by interpreting and counting growth rings on the sagitta otoliths of 252 adult fish caught by the Chinese commercial purse seine fleet during the period from November 2006 to January 2007 and 150 juveniles from bottom trawl surveys on the spawning ground in May 2006. The difference between the assumed birth date of 1st April and date of capture was used to adjust the age determined from counting the number of complete translucent rings. The parameters of three commonly used growth models, the von Bertalanffy, Logistic and Gompertz models, were estimated using the maximum likelihood method. Based on the Akaike Information Criterion (AIC), the von Bertalanffy growth model was found to be the most appropriate model. The size-at-age and size-at-maturity values were also found to decrease greatly compared with the results achieved in the 1950s, which was caused by heavy exploitation over the last few decades.

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Age and growth of the sharpsnout seabream Diplodus puntazzo (Cetti, 1777) inhabiting the Canarian archipelago, estimated by reading otoliths and by backcalculation

Cited by 16 publications

References 18 publications

Gonadal development and spawning cycle in the digynic hermaphrodite sharpsnout seabream Diplodus puntazzo (Sparidae) off the Canary Islands, northwest of Africa

Gonadal development and spawning cycle in the digynic hermaphrodite sharpsnout seabream Diplodus puntazzo (Sparidae) off the Canary Islands, northwest of Africa

Age-specific survivorship and fecundity shape genetic diversity in marine fishes

Age and growth of chub mackerel (Xcomber japonicus) in the East China and Yellow Seas using sectioned otolith samples

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