Depth segregation phenomenon in &lt;i&gt;Donax trunculus&lt;/i&gt; (Bivalvia: Donacidae) populations of the Algarve coast (southern Portugal)

Gaspar, Miguel B.; Chı́charo, Luis; Vasconcelos, Paulo; García, Alexandra; Santos, Ana Maria Pujol Vieira dos; Monteiro, Carlos C.

doi:10.3989/scimar.2002.66n2111

Cited by 52 publications

(36 citation statements)

References 19 publications

(26 reference statements)

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“…Our results are consistent with the work of Salas (1987) in Málaga (Spain), Ramón (1993) in Valencia (Spain) and Gaspar et al (2002) in Portugal. Differently, Mouëza (1971) indicated an isometric growth between the two linear parameters in the population colonizing the Bay of Bou Ismail (Algeria).…”

Section: Discussionsupporting

confidence: 83%

“…The positive allometry between these two linear parameters for D. trunculus is rare; it was reported by Fernández et al (1984) in Galicia (Spain) and Bayed (1998) between Tangier and Massa (Moroccan Atlantic coast). Furthermore, the w/L relationship showed a negative allometry growth for the Echatt population and isometric type of growth for the Sidi Salem population, the latter already reported by Mouëza (1971) in the Bay of Bou Ismail (Algeria), by Bayed (1998) in the Atlantic coast of Morocco and by Gaspar et al (2002) in Portugal. The growth rate (K) for the Echatt and Sidi Salem populations using the method of Von Bertalanffy (1938) was low (0.14 to 0.15), with L ∞ values ranging between 54.70 and 55.22 mm.…”

Section: Discussionmentioning

confidence: 62%

“…As related to the gonads development, the recruitment of D. trunculus occurred from April to October, with two major periods of recruits arrival in May and September, consistent with the work of Beldi (2007) in the Gulf of Annaba and that of Bakalem (1981) in the Bay of Algiers. Although a single recruitment peak of D. trunculus has been described (Voliani et al, 1997;Gaspar et al, 2002;Manca-Zeichen et al, 2002), many studies found two major periods of recruitment of young individuals of D. trunculus both in the Mediterranean Sea Mazé & Laborda, 1990;Ramón et al, 1995) and the Atlantic (Bayed & Guillou, 1985;Bayed, 1990;Guillou & Bayed, 1991).…”

Section: Discussionmentioning

confidence: 99%

“…The collection device is hung by a harness at the waist of the fisherman. The sampling gear was dragged over a distance of 5 m by a fisherman who moved backwards to two successive depths of 1 and 1.5 m. This collection method has already been described in works dealing with the dynamics of this bivalve in Italy (southern Adriatic Sea, (Manca-Zeichen et al, 2002) and Portugal (Atlantic coast, Gaspar et al, 2002).…”

Section: Sampling Proceduresmentioning

confidence: 99%

“…Individuals of D. trunculus were collected, counted and divided into size classes according to their total length at 2 mm interval (Mouëza, 1971;Guillou & Le Moal, 1980;Bayed & Guillou, 1985;Gaspar et al, 2002) to calculate the size frequency distribution of the clam. Individuals were measured according to their antero-posterior length (Lt) using a caliper with a precision of 0.01 mm.…”

Section: Population Dynamicsmentioning

confidence: 99%

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Population dynamics and secondary production of Donax trunculus (Mollusca, Bivalvia) in the Gulf of Annaba (Northeast Algeria)

Hafsaoui

Draredja²,

Lasota

et al. 2016

Medit. Mar. Sci.

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The population dynamics and secondary production of the wedge clam Donax trunculus were studied in the Gulf of Annaba (Northeast Algeria) monthly for one year at a site close to the Annaba port and the Seybouse river, affected by industrial and agricultural pollution (Sidi Salem), and at a site more distant from major pollution sources, but exploited by fishery (Echatt). The number of individuals (N) was lower at Sidi Salem (36–148 ind m-2) than at Echatt (63–272 ind m-2) in most sampling dates, while the biomass was more variable from one date to another, with no consistent pattern of differences between sites. The condition index (CI), although slightly higher at Sidi Salem than at Echatt, showed at both sites a major increase in March/April, June/July and October, reflecting two main periods of gonads development and increase in the level of stored reserves at the end of the reproductive period. Consistently, the recruitment of D. trunculus ran from April to October with a major peak of abundance in spring and a minor one in early fall. The maximum age of D. trunculus was 3 years and the growth rate was highest in the first year. Annual somatic production (P) was lower at Sidi Salem (0.773 g AFDM m-2 yr-1) than at Echatt (1.262 g AFDM m-2 yr-1), possibly reflecting a lower mean annual biomass at Sidi Salem (1.642 AFDM m-2) than at Echatt (3.046 AFDM m-2), while the annual P/B ratio was similar between the two sites (i.e. 0.471 and 0.414 yr-1, respectively). Lower N and P at Sidi Salem compared to Echatt are consistent with the proximity of Sidi Salem to the industrial port of Annaba and low hydrodynamic conditions which may favor the accumulation of pollutants, such as hydrocarbons. On the other hand, moderate secondary production of D. trunculus at Echatt compared to other Mediterranean sites may be due to excessive harvesting. We suggest that the low secondary production described in this study should be taken into account for the development of sustainable strategies of clam exploitation in the Gulf of Annaba. In particular, effort should be made to reduce land-based pollution and to regulate the collection of D. trunculus according to the life cycle and production potential of this species.

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Section: Discussionsupporting

confidence: 83%

Section: Discussionmentioning

confidence: 62%

Section: Discussionmentioning

confidence: 99%

Section: Sampling Proceduresmentioning

confidence: 99%

Section: Population Dynamicsmentioning

confidence: 99%

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Population dynamics and secondary production of Donax trunculus (Mollusca, Bivalvia) in the Gulf of Annaba (Northeast Algeria)

Hafsaoui

Draredja²,

Lasota

et al. 2016

Medit. Mar. Sci.

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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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The wedge clam Donax trunculus as sentinel organism for Mediterranean coastal monitoring in a global change context

Tlili

Mouneyrac

2019

Reg Environ Change

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Depth segregation phenomenon in <i>Donax trunculus</i> (Bivalvia: Donacidae) populations of the Algarve coast (southern Portugal)

Cited by 52 publications

References 19 publications

Population dynamics and secondary production of Donax trunculus (Mollusca, Bivalvia) in the Gulf of Annaba (Northeast Algeria)

Population dynamics and secondary production of Donax trunculus (Mollusca, Bivalvia) in the Gulf of Annaba (Northeast Algeria)

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

The wedge clam Donax trunculus as sentinel organism for Mediterranean coastal monitoring in a global change context

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