Biomass–density relationships and self-thinning of blue mussels (Mytilus spp.) reared on self-regulated longlines

Lachance-Bernard, Myriam; Daigle, Gaétan; Himmelman, John H.; Fréchette, Marcel

doi:10.1016/j.aquaculture.2010.07.038

Cited by 26 publications

(20 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Density-dependent effects are found in survivorship only. Our results support the conclusion based on the exponent of the tridimensional ST curve that these mussel populations are regulated by competition for space (Lachance-Bernard et al 2010). The combination of densityindependent growth (present study) with density-dependent mortality (Lachance-Bernard et al 2010) indicates that mussel populations on these ropes traveled along the self-thinning line at the junction between the maximum mean mass boundary and the maximum crowding index boundary depicted by Guiñez et al (see their Fig.…”

Section: Discussionsupporting

confidence: 81%

“…The present study implies that the process is driven by spatial constraints. Therefore, our results directly support the inference based on the exponent of 3-D ST curves (Lachance-Bernard et al 2010).…”

Section: Discussionsupporting

confidence: 63%

“…The effective-density method was developed for the analysis of an intertidal tunicate (Guiñez and Castilla 2001). The multilayer method was applied to suspensiongrown mussels (Lachance-Bernard et al 2010) and provided estimates of the 3-D ST exponent which are consistent with the present study i.e., that ST in suspension-grown mussels is driven by spatial constraints (see also Lauzon-Guay et al 2006). This conclusion clearly diverges from that of Filgueira et al (2008), who reported FST in suspension-grown mussels using the effective-density method.…”

Section: Discussionsupporting

confidence: 59%

“…This rules out food regulation (or other metabolic constraints such as chemical competition) in mussel populations grown on ropes in Cascapédia Bay. ST is under way on these ropes at 27 months (Lachance-Bernard et al 2010). The present study implies that the process is driven by spatial constraints.…”

Section: Discussionmentioning

confidence: 99%

“…It appears that the effective-density method is not well suited for suspension-grown mussels. The multilayer approach was used by Lachance-Bernard et al (2010) in a study of blue mussels (Mytilus spp.) growing in suspension on spat collectors.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Body size, population density and factors regulating suspension-cultured blue mussel (Mytilusspp.) populations

Fréchette¹,

Lachance-Bernard²,

Daigle

2010

Aquat. Living Resour.

Self Cite

View full text Add to dashboard Cite

-We sampled 27 month-old mussel populations grown on collector ropes in Cascapédia Bay, Quebec, to test whether density-dependent growth was present concomitantly to self-thinning, a process which was previously shown to occur in this system and thought to be driven by spatial constraints. Biomass-density curves of raw samples were curvilinear, suggesting density-dependent growth. However, at least two cohorts were present. Fractionating the samples on the basis of age yielded a linear relationship for the main, 2 year-old cohort. This implies density-independent growth and rules out food regulation in these populations. Therefore, our results are consistent with inferences drawn previously from the values of the self-thinning exponent, that is, space-regulated self-thinning. Our results suggest that curvilinearity of the raw biomass-density curves resulted from a bias caused by including the 1 year-old cohort and spat of the year in the analysis. This conclusion is supported by a model showing that samples with mixed cohorts can yield linear, concave or convex biomass-density curves without density-dependent growth. The shape of the curves depends on the scaling relationships between cohort abundances. It appears that the shape of biomass-density curves may be a useful complementary criterion -in addition to the value of self-thinning exponents -for the identification of food or space as factors regulating cultured populations. Key words:Mussel culture / Population regulation / Mussel density / Self-thinning Résumé -Le processus d'autoréduction (mortalité par compétition, "self-thinning") observé chez les populations de moules élevées sur collecteurs de naissain dans la baie de Cascapédia (Québec) a été attribué à la compétition pour l'espace. Dans le but de déterminer si la compétition affecte également la croissance individuelle, nous avons étudié la courbe biomasse-densité d'échantillons en culture depuis 27 mois. Nous observons des courbes concaves, ce qui à première vue correspond à un processus dépendant de la densité. Toutefois, les échantillons comptaient au moins deux cohortes. L'analyse des moules de la cohorte principale, âgée de 2 ans, indique une relation linéaire. La croissance est donc indépendante de la densité, ce qui exclut toute forme de compétition pour la nourriture et confirme les conclusions des travaux antérieurs, fondées sur la valeur de l'exposant de la fonction d'autoréduction. L'analyse suggère que la concavité des courbes biomasse-densité brutes s'explique par un biais causé par l'inclusion des moules âgées d'un an et du naissain dans l'analyse. Cette conclusion est appuyée par un modèle de l'effet du mélange des cohortes. Ce modèle indique qu'en absence de compétition, les courbes biomasse-densité peuvent être linéaires, convexes ou concaves, la forme de la relation dépendant de la relation entre les effectifs des cohortes. Il semble que la courbe biomasse-densité soit un outil diagnostique utile -s'ajoutant à l'exposant de la fonction d'autoréduction -pour la mise en évid...

show abstract

Section: Discussionsupporting

confidence: 81%

Section: Discussionsupporting

confidence: 63%

Section: Discussionsupporting

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Body size, population density and factors regulating suspension-cultured blue mussel (Mytilusspp.) populations

Fréchette¹,

Lachance-Bernard²,

Daigle

2010

Aquat. Living Resour.

Self Cite

View full text Add to dashboard Cite

show abstract

Nutrient Extraction Through Bivalves

Petersen

Holmer

Termansen

et al. 2018

Goods and Services of Marine Bivalves

View full text Add to dashboard Cite

Ecosystem services provided by marine bivalves in relation to nutrient extraction from the coastal environment have gained increased attention to mitigate adverse effects of excess nutrient loading from human activities, such as agriculture and sewage discharge. These activities damage coastal ecosystems and require action from local, regional, and national environmental management. Marine bivalves filter particles like phytoplankton, thereby transforming particulate organic matter into bivalve tissue or larger faecal pellets that are transferred to the benthos. Nutrient extraction from the coastal environment takes place through two different pathways: (i) harvest/removal of the bivalves-thereby returning nutrients back to land; or (ii) through increased denitrification in proximity to dense bivalve aggregations, leading to loss of nitrogen to the atmosphere. Active use of marine bivalves for nutrient extraction may include a number of secondary effects on the ecosystem, such as filtration of particulate material. This leads to partial transformation of particulate-bound nutrients into dissolved nutrients via bivalve excretion or enhanced mineralization of faecal material. In this chapter, concepts in relation to nutrient extraction by bivalves are presented and discussed in relation to nutrient cycling and additional effects of enhancing bivalve communities. In addition, meth

show abstract

Picophytoplankton contribution to Mytilus edulis growth in an intensive culture environment

et al. 2016

View full text Add to dashboard Cite

show abstract

Biomass–density relationships and self-thinning of blue mussels (Mytilus spp.) reared on self-regulated longlines

Cited by 26 publications

References 55 publications

Body size, population density and factors regulating suspension-cultured blue mussel (Mytilusspp.) populations

Body size, population density and factors regulating suspension-cultured blue mussel (Mytilusspp.) populations

Nutrient Extraction Through Bivalves

Picophytoplankton contribution to Mytilus edulis growth in an intensive culture environment

Contact Info

Product

Resources

About