Larval supply of Peruvian scallop to the marine reserve of Lobos de Tierra Island: A modeling approach

Flores-Valiente, Jorge; Tam, Jorge; Brochier, Timothée; Colas, François; Pecquerie, Laure; Aguirre-Velarde, Arturo; Mendo, Jaime; Lett, Christophe

doi:10.1016/j.seares.2018.12.003

Cited by 9 publications

(9 citation statements)

References 65 publications

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“…Such a pattern could be due to the additional energy mobilization towards spawning after maturation (Kraffe et al, 2008), which would increase oxygen demand, and/or to reduced reserves for aerobic and anaerobic metabolisms under hypoxia (Brokordt et al, 2015). The higher proportion of juveniles after mass mortalities in the years 1995 to 2014 in the natural bed of Lobos de Tierra Island (south of Sechura, Flores-Valiente et al, 2019) would agree with a higher tolerance of small-sized scallops to environmental stressors. In fine, smaller body size would be an outcome to global warming and deoxygenation of seawater (Baudron, Needle, Rijnsdorp, & Tara Marshall, 2014;Daufresne, Lengfellner, & Sommer, 2009;Gardner, Peters, Kearney, Joseph, & Heinsohn, 2011).…”

Section: Hypoxia-related Mortality and Size-related Tolerance To Hypoxiamentioning

confidence: 95%

Size‐based survival of cultured Argopecten purpuratus (L, 1819) under severe hypoxia

Cueto-Vega

Flye-Sainte-Marie

Aguirre-Velarde

et al. 2021

J World Aquaculture Soc

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During recent years, mass mortalities of cultured scallops became more frequent in Peruvian bays. One of the main drivers related to these mortalities was hypoxic events. This study was designed to understand the hypoxia phenomenon in these bays and to assess how the Peruvian scallop, Argopecten purpuratus, can cope with reduced oxygen levels in seawater based on individual size. First, we analyzed the relationships between dissolved oxygen saturation and other environmental parameters (the Coastal El Niño Index, temperature, salinity and pH) in bottom seawater, the frequency and intensity of hypoxic events in two main culture areas (Sechura and Paracas Bays), and their relationship with scallop mass mortalities. Then, we performed experiments with two size groups of A. purpuratus (31 and 80 mm shell height; seed and commercial size, respectively) to assess their respective survival time under severe hypoxia (1% oxygen saturation) at 16 C and a salinity of 35. Finally, the results of the field records and the experimental data are used to suggest ways to improve scallop cultivation along the Peruvian coast.

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Section: Hypoxia-related Mortality and Size-related Tolerance To Hypoxiamentioning

confidence: 95%

Size‐based survival of cultured Argopecten purpuratus (L, 1819) under severe hypoxia

Cueto-Vega

Flye-Sainte-Marie

Aguirre-Velarde

et al. 2021

J World Aquaculture Soc

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“…And the areas in Samanco and La Rinconada present gyres or gyre-like currents (Avendaño D., Cantillánez S., Thouzeau, & Peña, 2007;Tenorio, 2016) which promote larval retention. In contrast, the lower inbreeding values detected in Lobos de Tierra Islands and Sechura Bay (Table 1) may be due to low larval retention in these areas (Flores-Valiente et al, 2019).…”

Section: Population Structure and Gene Flow Analysismentioning

confidence: 81%

“…Exception are the populations of Sechura and Lobos de Tierra which are separated by less than 150 km. If we account for the moderate dispersal capability of the Peruvian scallop and the "weak source (SEC) -strong sink (LDT)" scenario suggested for the populations of Sechura and Lobos de Tierra (Flores-Valiente et al, 2019), high levels of genetic admixture are expected. But, for the other populations, the distance between them is >600 km, right in the upper limit of the dispersal distance estimated for species with high larval dispersion capabilities (Van Wyngaarden et al, 2017).…”

Section: Population Structure and Gene Flow Analysismentioning

confidence: 99%

“…But, for the other populations, the distance between them is >600 km, right in the upper limit of the dispersal distance estimated for species with high larval dispersion capabilities (Van Wyngaarden et al, 2017). Except for Flores-Valiente et al (2019), no other study has assessed the potential role that marine currents in Peru play in larval transport and retention (see Barahona, Velez-Zuazo, Santa-Maria, & Pacheco, 2019). In any case, we would expect to detect population structure at least between Bahia Independencia and the rest of sites.…”

Section: Population Structure and Gene Flow Analysismentioning

confidence: 99%

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Substantial gene flow caused by long-term translocation between wild populations of the Peruvian scallop (Argopecten purpuratus) is supported by RAD-Seq analyses

Vélez‐Zuazo

Barahona

Mello³

et al. 2020

Preprint

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The Peruvian scallop (Argopecten purpuratus, Lamarck 1989) is a marine bivalve of high commercial value in the aquaculture industry, with wild populations distributing from northern Peru to Chile. Its growing demand in the world aquaculture markets and limited availability of hatchery-based seeds, caused long-term seed translocations among wild populations to recover depleted local populations and for production needs. We investigated long-term translocations effects on the genetic diversity and structure of wild populations using next-generation RAD sequencing. We sampled individuals from Sechura, Lobos de Tierra, Samanco and Bahia Independencia in Peru, and La Rinconada in Northern Chile. We identified 6275 polymorphic RAD tags and 8345 SNPs for the five populations. We estimated high observed heterozygosity for all populations and high SNP frequency compared to similar studies on marine bivalves. We detected no spatial divergence among populations in Peru (pairwise FST ranged from 0 to 0.003), but strong differentiation with the population in Chile. Migration rate estimates suggested asymmetric directionality of seed translocation. Overall, our results support a remnant effect of an intense historic translocation and on-going gene flow among wild populations in Peru, challenging the identification of outlier loci and certification of sustainable origin of cultured scallops using genetic markers.

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“…Islands and Sechura Bay (Table 1) may be because of low larval retention in these areas (Flores-Valiente et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Substantial gene flow caused by long‐term translocation between natural bank populations of the Peruvian scallop (Argopecten purpuratus) is supported by RAD‐Seq analyses

Vélez‐Zuazo

Barahona

Melo³

et al. 2021

J World Aquaculture Soc

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Larval supply of Peruvian scallop to the marine reserve of Lobos de Tierra Island: A modeling approach

Cited by 9 publications

References 65 publications

Size‐based survival of cultured Argopecten purpuratus (L, 1819) under severe hypoxia

Size‐based survival of cultured Argopecten purpuratus (L, 1819) under severe hypoxia

Substantial gene flow caused by long-term translocation between wild populations of the Peruvian scallop (Argopecten purpuratus) is supported by RAD-Seq analyses

Substantial gene flow caused by long‐term translocation between natural bank populations of the Peruvian scallop (Argopecten purpuratus) is supported by RAD‐Seq analyses

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