Age and Growth of Chamelea Gallina From the Algarve Coast (Southern Portugal): Influence of Seawater Temperature and Gametogenic Cycle on Growth Rate

Gaspar, Miguel B.; Pereira, Alexandre M.; Vasconcelos, Paulo; Monteiro, Carlos C.

doi:10.1093/mollus/70.4.371

Cited by 50 publications

(54 citation statements)

References 13 publications

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“…Although quick and economic, the examination of surface rings proved to be inadequate and unreliable for ageing D. exoleta. The unrealistic VBG parameters obtained from surface rings were already expected, because the growth rate is slower in older individuals making it difficult to distinguish and measure surface rings closer to the edge of the shell (Deval 2001;Gaspar et al 2004;Moura et al 2009). Differences between surface and internal growth rings were also observed in Macoma balthica.…”

Section: Discussionmentioning

confidence: 99%

“…Subsequently, for estimating age and growth, the rings deposited on the external surface of the shells were counted and measured with the digital calliper. In addition, the internal structure of each shell was analysed using acetate peel replicas of polished and etched sections of resin-embedded valves, following the technique previously adopted with success in other commercially exploited bivalve species from the Portuguese coast (for further details see Gaspar et al 1995Gaspar et al , 2002Gaspar et al , 2004Moura et al 2009). Based on previous studies with sympatric bivalve species from the Portuguese coast, such as Callista chione (Moura et al 2009) and Chamelea gallina (Gaspar et al 2004), it was assumed that the growth marks in the shells of D. exoleta are annual, being deposited in late autumn-early winter when shell growth is slower.…”

Section: Methodsmentioning

confidence: 99%

“…Knowledge on the age and growth of commercially exploited bivalve species is a crucial requirement for the successful management of the fishery (Gaspar et al 2004). In bivalves, growth rings on the shell surface have been widely used to make inferences about age and growth rate (Deval 2001).…”

Section: Introductionmentioning

confidence: 99%

“…In bivalves, growth rings on the shell surface have been widely used to make inferences about age and growth rate (Deval 2001). Although being the most quick and economic method, in some species it is difficult to discern real seasonal growth rings from false rings caused by gonad development and spawning, diseases, extreme temperatures, storms and damage during dredging (Gaspar et al 1995(Gaspar et al , 2004Richardson 2001;Keller et al 2002;Moura et al 2009). These constraints have been overcome by analysing internal shell microgrowth banding patterns revealed in acetate peel replicas of sectioned shells (Jones et al 1990;Ramón and Richardson 1992;Richardson 2001).…”

Section: Introductionmentioning

confidence: 99%

“…However, some problems in the identification of the annual ring may also occur, especially in long-lived species. In older specimens, the umbonal region is usually eroded, making impossible to identify the first growth rings (Gaspar et al 2004). In addition, in older individuals growth becomes slower and the later growth rings are deposited very close together at the shell margin, making them hardly discernible (Deval and Oray 1998;Ezgeta-Balić et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Age and growth in three populations of Dosinia exoleta (Bivalvia: Veneridae) from the Portuguese coast

2013

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The present study aimed at estimating the age and growth in three populations of Dosinia exoleta from the Portuguese coast (Aveiro in the north, Setúbal in the southwest and Faro in the south). Two techniques were compared to ascertain the most suitable method for ageing D. exoleta. Growth marks on the shell surface and acetate peel replicas of sectioned shells were the techniques applied. Two hypotheses were tested: growth parameters present latitudinal variation along the Portuguese coast; growth parameters are influenced by the fishing exploitation. Shell surface rings proved inappropriate for ageing this species, whereas acetate peels provided realistic estimates of the von Bertalanffy growth parameters (K, L ? and t 0 ). A latitudinal gradient in growth rate was detected, with a clear southward increase in the growth coefficient (K) of D. exoleta (Faro [ Setúbal and Aveiro) indicating that warmer waters in southern Portugal provide optimal conditions for the growth of this species. Fishing exploitation in northern Portugal targets larger individuals and leaves behind a younger population of smaller individuals, decreasing the asymptotic shell length (L ? ) of D. exoleta from Aveiro. The overall growth performance was compared among populations of D. exoleta and with other venerid species worldwide.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Age and growth in three populations of Dosinia exoleta (Bivalvia: Veneridae) from the Portuguese coast

2013

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Growth

2015

Marine Bivalve Molluscs

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Bivalve sanctuaries to enhance stocks along the Algarve coast of southern Portugal: A spatio‐temporal approach

Rufino

Vasconcelos

Pereira

et al. 2018

Aquatic Conservation

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Populations of marine bivalves are subject to large interannual fluctuations as a result of their sensitivity to unfavourable environmental conditions. These populations have a strong dependence on recruitment, which constitutes a risk to stock conservation and the sustainability of the commercially exploited species. Bivalve sanctuaries comprising no‐take areas can promote the restocking of large coastal areas as a result of the high fecundity and the potentially long‐distance larval dispersal of bivalves. The present study explores a novel spatio‐temporal approach to investigate suitable locations for bivalve sanctuaries, aimed at protecting and enhancing stocks along the Algarve coast in southern Portugal. In the context of small‐scale fisheries, bivalve dredging constitutes an important socio‐economic activity. Three bivalve species are targeted: the striped venus (Chamelea gallina), the donax clam (Donax trunculus), and the surf clam (Spisula solida). Data gathered from 36 bivalve fishing surveys conducted over three decades (1986–2015) were analysed using geostatistical methods, accounting for temporal and spatial autocorrelation to produce continuous prediction maps of species distribution for each survey. The approach taken permitted the use of all scattered historical data collected by different methods. The predictions were then used to summarize and illustrate the spatial distribution of species across time, in terms of average biomass, variability, and maximum potential biomass, and to delimit the areas as a function of the species persistence (recurrent, occasional, or rare). The temporal patterns through space were further investigated using empirical orthogonal function (EOF) analysis. The areas accounting for 80% of the species biomass were also estimated. Results of this set of analyses led to the proposal of locations for establishing bivalve sanctuaries, aimed at enhancing the stocks of commercial bivalve species in the long term. Such an innovative spatio‐temporal approach and management strategy is replicable in other fishing resources and geographic areas.

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Age and Growth of Chamelea Gallina From the Algarve Coast (Southern Portugal): Influence of Seawater Temperature and Gametogenic Cycle on Growth Rate

Cited by 50 publications

References 13 publications

Age and growth in three populations of Dosinia exoleta (Bivalvia: Veneridae) from the Portuguese coast

Age and growth in three populations of Dosinia exoleta (Bivalvia: Veneridae) from the Portuguese coast

Growth

Bivalve sanctuaries to enhance stocks along the Algarve coast of southern Portugal: A spatio‐temporal approach

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