A review on self-thinning in mussels

Guíñez, Ricardo

doi:10.4067/s0718-19572005000100001

Cited by 34 publications

(19 citation statements)

References 40 publications

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“…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. 3;2005). Although mussel age was not determined in the 9 Sept. samples, the similarity between the raw B-N curves found for both sampling days suggests that processes acting on the ropes sampled on both occasions were similar.…”

Section: Discussionsupporting

confidence: 59%

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

Fréchette¹,

Lachance-Bernard²,

Daigle

2010

Aquat. Living Resour.

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-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...

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Section: Discussionsupporting

confidence: 59%

“…Self-thinning (ST) has been reported in sessile animals such as barnacles (Hughes and Griffiths 1988), tunicates (Guiñez and Castilla 2001) and mussels (reviewed by Guiñez 2005) and probably occurs also in scallop spat collector bags . Although ST appears an undesirable 248 M. Fréchette et al: Aquat.…”

Section: Introductionmentioning

confidence: 99%

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

Fréchette¹,

Lachance-Bernard²,

Daigle

2010

Aquat. Living Resour.

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“…Marine mussels (Mytilidae) on rocky shores have long been known to compete for space and food and to exhibit self-thinning (e.g. Hughes & Griffiths 1988, Guiñez 2005, a process by which mussels are ejected from 2-or 3-dimensional beds. It is also known that storms and heavy wave action make ejection of mussels much more likely (e.g.…”

Section: Discussionmentioning

confidence: 99%

Common sea anemones Actinia equina are predominantly sessile intertidal scavengers

Davenport¹,

Moloney²,

Kelly³

2011

Mar. Ecol. Prog. Ser.

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Coelenteron contents of anemones Actinia equina collected from 2 shore heights (upper and lower) on 3 shores (exposed, semi-exposed and sheltered) in south-west Ireland were investigated in summer 2009. Diets of exposed and semi-exposed shore anemones were dominated by small mussels Mytilus edulis, mostly (> 90%) with broken/cracked shells. The diet of anemones on the sheltered shore was dominated by insects, particularly on the upper shore. On all shores, larger food items (isopods, mussels, insects) were broken or fragmented; only small gammarid amphipods, crab megalopae, midges and mosquitos were found whole. Laboratory behavioural experiments showed that A. equina were unselective at small prey size, but were limited by their own size, which restricted the maximum size of prey that could be ingested. Whole mussels were ingested, but egested alive after mean elapsed times of 0.75 to 1.95 h (depending upon anemone size). In contrast, mussels with cut adductor muscles, and incapable of shell valve closure, were fully digested, empty shells not being egested until 8.70 to 8.95 h after ingestion. Whole, live mealworms Tenebrio molitor were eaten by anemones, but were egested after a mean 1.30 h with no signs of digestion or fragmentation. Mealworms with mechanically perforated exoskeletons were held in the coelenterons of A. equina for a mean of 5.90 h and all soft tissues were digested. It was concluded that A. equina predominantly scavenges on macrofaunal carrion, as well as preying upon smaller food items.

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“…Brachidontes are found attached to the rocky intertidal zone and may be caught by the sea anemones if they become detached from the substrate. Mytilid bivalves form aggregations and are subject to intraspecific competition that generates high levels of mortality in the population (Guiñez 2005). Moreover, bivalves in the intertidal zone are subjected to strong waves that can detach them from the substrate, depending on the size of the bivalve and how firmly it is adhered (Hunt and Scheibling 2001).…”

Section: Discussionmentioning

confidence: 99%

Diet of the sea anemone Anthopleura nigrescens: composition and variation between daytime and nighttime high tides

2014

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Background: The diverse feeding habits of sea anemones have led them to be classified as opportunistic polyphagous predators. However, most studies have focused on the diet of temperate sea anemones, and little is known about the trophic ecology of tropical species and their role in tropical ecosystems. We studied the diet of the intertidal sea anemone Anthopleura nigrescens by examining the gut contents of specimens collected at two sites on Costa Rica's Pacific coast, testing for differences in prey items captured between daytime and nighttime high tides. Results: We found 25 prey items including: mollusks, crustaceans, annelids, insects and eggs. Juvenile bivalves, barnacle cyprids, and copepods were the main prey items. The anemones at Playa Dominical captured significantly more juvenile bivalves during nighttime high tides, and those at Mata de Limón captured more cyprids during daytime high tides. Conclusions: This study shows that A. nigrescens is an opportunistic polyphagous predator, like most of its temperate counterparts.

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A review on self-thinning in mussels

Cited by 34 publications

References 40 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

Common sea anemones Actinia equina are predominantly sessile intertidal scavengers

Diet of the sea anemone Anthopleura nigrescens: composition and variation between daytime and nighttime high tides

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