Blue mussel

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Blue mussel
Miesmuscheln-2.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Order: Mytilida
Family: Mytilidae
Genus: Mytilus
Species:
M. edulis
Binomial name
Mytilus edulis

The blue mussel (Mytilus edulis), also known as the common mussel, [1] is a medium-sized edible marine bivalve mollusc in the family Mytilidae, the mussels. Blue mussels are subject to commercial use and intensive aquaculture. A species with a large range, empty shells are commonly found on beaches around the world.

Contents

Systematics and distribution

The Mytilus edulis complex

Systematically blue mussel consists of a group of (at least) three closely related taxa of mussels, known as the Mytilus edulis complex. Collectively they occupy both coasts of the North Atlantic (including the Mediterranean) and of the North Pacific in temperate to polar waters, [2] as well as coasts of similar nature in the Southern Hemisphere. The distribution of the component taxa has been recently modified as a result of human activity. The taxa can hybridise with each other, if present at the same locality.

Mytilus edulis, strict sense

The Atlantic blue mussel is native on the North American Atlantic coast, but is found intermixed with M. trossulus north of Maine. In Atlantic Canada, M. trossulus was found to have smaller shell growth values than M. edulis and contain less meat than M. edulis. [4] Keeping this in mind, M. edulis, under raft culture conditions, is estimated to have an economic value of 1.7 times M. trossulus. [4] In Europe it is found from French Atlantic coast northwards to Novaya Zemlya and Iceland, but not in the Baltic Sea. In France and in the British Isles, it makes hybrid zones with M. galloprovincialis, and also is sometimes intermixed with M. trossulus.

The genetically distinct lineage of M. edulis present in the Southern Hemisphere has been attributed to subspecies Mytilus edulis platensis (now Mytilus platensis ). [3]

Habitat

Orientation terminology (a) The outside of the right shell (b) The inside of the left shell (c) Without shells, right lateral overview generated from a micro-CT scan D, Dorsal; V, Ventral; A, Anterior; P, Posterior Orientation terminology for Mytilus edulis.webp
Orientation terminology 
(a) The outside of the right shell
(b) The inside of the left shell
(c) Without shells, right lateral overview generated from a micro-CT scan
D, Dorsal; V, Ventral; A, Anterior; P, Posterior
General anatomy of the tissues (a) Ventral view after cutting the adductor muscles and forcing the valves to open, hereby rupturing the connecting mantle parts (b) Oblique dorsal view on a sedated specimen L, Left; R, Right; P, Posterior; A, Anterior General anatomy of Mytilus edulis tissues.webp
General anatomy of the tissues 
(a) Ventral view after cutting the adductor muscles and forcing the valves to open, hereby rupturing the connecting mantle parts
(b) Oblique dorsal view on a sedated specimen
L, Left; R, Right; P, Posterior; A, Anterior
Internal anatomy Longitudinal micro-CT section in 3D at the level of the heart of a critical point dried blue mussel after Bouin fixation. GI, Gastro-intestinal; D,Dorsal; V, Ventral; P, Posterior; A, Anterior Internal anatomy of Mytilus edulis.webp
Internal anatomy 
Longitudinal micro-CT section in 3D at the level of the heart of a critical point dried blue mussel after Bouin fixation.
GI, Gastro-intestinal; D,Dorsal; V, Ventral; P, Posterior; A, Anterior

Blue mussels are boreo-temperate invertebrates that live in intertidal areas attached to rocks and other hard substrates by strong (and somewhat elastic) thread-like structures called byssal threads, secreted by byssal glands located in the foot of the mussel.

Description

The shape of the shell is triangular and elongated with rounded edges. The shell is smooth with a sculpturing of fine concentric growth lines but no radiating ribs. The shells of this species are purple, blue or sometimes brown in color, occasionally with radial stripes. The outer surface of the shell is covered by the periostracum which as eroded, exposes the colored prismatic calcitic layer. Blue Mussels are semi-sessile, having the ability to detach and reattach to a surface allowing the mollusk to reposition itself relative to the water position.

Right and left valve of the same specimen:

var. flavida

Reproduction

Mussels have separate sexes. Once the sperm and eggs are fully developed they are released into the water column for fertilization. Although there are about 10,000 sperm per egg, [6] large proportions of eggs deposited by blue mussels are never fertilized. As few as 1% of larvae that do mature ever reach adulthood. The majority are eaten by predators before completing metamorphosis.

The reproductive strategy seen in blue mussels is characteristic of planktotrophs. By minimizing nutrients in egg production to the bare minimum they are able to maximize the number of gametes produced. If the adult mussels are stressed during the beginning of gametogenesis, the process is terminated. [7] When stressed while fresh gametes are present, adult mussels reabsorb gametes. Larvae viability is also affected by the condition of parents: high water temperatures, pollutants and scarcity of food, during gamete production. [7] The reduction in viability is probably due to the lack of lipid reserves distributed to the eggs.

Monitor of environmental DNA damage

Blue mussels are used for monitoring marine pollution based on their tendency to accumulate numerous pollutants from their natural environment. [8] Upon in vivo exposure of blue mussels (Mytilus edulis) to either of two metals of environmental concern, cadmium or chromium, it was found that both of these metals induce DNA strand breakage, and also impair different DNA repair capacities in the tissues of these mussels. [8]

Larval development

Larval development can last from 15 to 35 days depending environmental conditions including salinity and temperature, as well as location. Larvae originating from Connecticut mature normally at 15–20 °C (59–68 °F), though at 15 °C (59 °F) normal development occurs at salinities between 15 and 35 ppt and at 35 ppt at 20 °C (68 °F). [9]

The first stage of development is the ciliated embryo, which in 24-hours for fertilization form the trochophore. At this point although mobile, it is still reliant on the yolk for nutrients. Characterized by a functional mouth and alimentary canal the veliger stage also has cilia which are used for filtering food as well as propulsion. A thin translucent shell is secreted by the shell gland forming the notable straight hinge of the prodissoconch I shell. The veliger continues to mature forming the prodissoconch II shell. In the end stage of veliger development photosensitive eye spots and elongated foot with a byssal gland are formed. [10]

Once the pediveliger is fully developed, its foot extends and makes contact with substrate. The initial contact with the substrate is loose. If the substrate is suitable, the larva will metamorphoses into the juvenile form, plantigrade, and attach byssus threads. The mussel will remain in that state until reaching 1-1.5mm in length. This attachment is the prerequisite for the foundation for the blue mussel population. In sheltered environments large masses sometimes form beds which offer shelter and food for other invertebrates. Byssal thread are secreted by byssal glands located in the foot of the mussel, and are made up of polyphenolic proteins which serve as a bioadhesive. [10]

Aggregation and mussel bed formation

Blue mussels often form aggregations, where they attach to each other using byssus threads. These are collagenous protein strands used for attachment. The type of aggregation depends on population densities. [11] When densities are low, for example in mussel fields – short-lived mussel populations – clumped distribution patterns are seen. [12] The rate of aggregation is aided by the presence of predator cues. [13]

Several explanations for aggregate formation have been offered, such as increase of reproductive success in low density populations, [14] resisting of wave action, [11] and defence against predators. [13] It is, however, still unclear what the main purpose is and aggregation might have different purposes under different circumstances.

Mussel bed in Rhode Island, USA Mussel bed.jpg
Mussel bed in Rhode Island, USA

Mussel beds are persistent, dense mussel populations. Beds generally form from fields that persist long enough to establish a dense population. [12] In high density aggregations, growth of blue mussels at the centre of the aggregation is reduced, likely due to a reduction in food availability. When possible, mussels will thus migrate to lower densities on larger scales (>7.5 cm), but aggregate on small scales (<2.0 cm). [11] In areas where blue mussels are threatened, such as the Wadden Sea, it is of great importance to enhance the survival of mussel fields, of which mussel aggregates are the primary component.

Predators

Predation of blue mussels is greatest during the three weeks it spends as a planktonic larva. During this stage it is susceptible to jellyfish and fish larvae through adults. Once it metamorphoses the mussel is still restricted by predation, with smaller mussels with thinner, weaker shells most affected. Once the shells becomes stronger, blue mussels are preyed upon by sea stars such as Asterias vulgaris as well as by several species of sea gulls. The capability of shell thickening by mussels has become a very effective defense mechanism. In the presence of predators a mussel is able to increase shell thickness 5 to 10 percent, which in turn makes opening the shell take 50 percent more time. [15] Small mussels are also eaten by the dog whelk, Nucella lapillus . [16] The blue mussel is host to a wide range of parasites, but these parasites usually do not cause much damage.[ citation needed ] Blue Mussels are able to fight off one species of predator at a time such as sea star (Asterias rubens (=Asterias vulgaris)) or green crabs (Carcinus maenas). They use their inducible defenses to strengthen their adductor muscle or grow thicker shells. When faced with two species at a time, they are no longer able to use their defenses and can be killed more easily. [17]

Uses and ecosystem services

Boiled blue mussels in Normandy, France Normandy '10- Saint-Vaast-la-Hougue (4826863803).jpg
Boiled blue mussels in Normandy, France

Blue mussels are filter feeders and play a vital role in estuaries by removing bacteria and toxins. Mytilus edulis is commonly harvested for food throughout the world, from both wild and farmed sources. Mussels are a staple of many seafood dishes in various cuisines including Spanish (especially Galician), Portuguese, French, British, Dutch, Belgian, Italian and Turkey as midye dolma. They are also commonly used as lab animals. Blue mussels were also harvested by the indigenous peoples of North America. [18]

Blue mussels are starting to decline in areas such as the Gulf of Maine. Historical references have shown a decrease of about 40 percent in the last fifty years. [19] This can cause a future problem because mussels are foundation species providing homes and protecting other small animals in the intertidal zone like small fish as well as filtering the water. Mussels filter out bacteria, metals, and toxins, that would increase significantly without mussels around. [20] Ocean acidification due to increasing atmospheric carbon dioxide is projected to reduce the growth and survival of blue mussels; in turn, this could drastically reduce their positive impact on coastal water quality. [21]

Related Research Articles

<span class="mw-page-title-main">Mussel</span> Type of bivalve mollusc

Mussel is the common name used for members of several families of bivalve molluscs, from saltwater and freshwater habitats. These groups have in common a shell whose outline is elongated and asymmetrical compared with other edible clams, which are often more or less rounded or oval.

<span class="mw-page-title-main">Bivalvia</span> Class of molluscs

Bivalvia, in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, bivalves have no head and they lack some usual molluscan organs, like the radula and the odontophore. The class includes the clams, oysters, cockles, mussels, scallops, and numerous other families that live in saltwater, as well as a number of families that live in freshwater. The majority are filter feeders. The gills have evolved into ctenidia, specialised organs for feeding and breathing. Most bivalves bury themselves in sediment, where they are relatively safe from predation. Others lie on the sea floor or attach themselves to rocks or other hard surfaces. Some bivalves, such as the scallops and file shells, can swim. Shipworms bore into wood, clay, or stone and live inside these substances.

<span class="mw-page-title-main">Byssus</span> Fibre secreted by some molluscs

A byssus is a bundle of filaments secreted by many species of bivalve mollusc that function to attach the mollusc to a solid surface. Species from several families of clams have a byssus, including pen shells (Pinnidae), true mussels (Mytilidae), and Dreissenidae.

<span class="mw-page-title-main">Clumping (biology)</span> Biological behavior

Clumping is a behavior in an organism, usually sessile, in which individuals of a particular species group close to one another for beneficial purposes. Clumping can be caused by the abiotic environment surrounding an organism. Barnacles, for example, group together on rocks that are exposed for the least amount of time during the low tide. Usually, clumping in sessile animals starts when one organism binds to a hard substrate, such as rock, and other members of the same species attach themselves afterwards. Herbivorous snails are known to clump around where sufficient algae are present. The clumping of mussels has been found to be influenced by competition with other species. The mussels attach themselves by byssal threads to potential competitors for space.

<span class="mw-page-title-main">California mussel</span> Species of bivalve

The California mussel is a large edible mussel, a marine bivalve mollusk in the family Mytilidae.

<i>Atrina fragilis</i> Species of bivalve

Atrina fragilis, the fan mussel, is a species of large saltwater clam, a marine bivalve mollusc in the family Pinnidae, the pen shells.

<i>Semibalanus balanoides</i> Species of barnacle

Semibalanus balanoides is a common and widespread boreo-arctic species of acorn barnacle. It is common on rocks and other substrates in the intertidal zone of north-western Europe and both coasts of North America.

<span class="mw-page-title-main">Common starfish</span> Species of starfish

The common starfish, common sea star or sugar starfish is the most common and familiar starfish in the north-east Atlantic. Belonging to the family Asteriidae, it has five arms and usually grows to between 10–30 cm across, although larger specimens are known. The common starfish is usually orange or brownish in color, and sometimes violet; specimens found in deeper waters are pale. The common starfish is found on rocky and gravelly substrates where it feeds on mollusks and other benthic invertebrates.

<i>Perna perna</i> Species of bivalve

Perna perna, the brown mussel, is an economically important mussel, a bivalve mollusc belonging to the family Mytilidae. It is harvested as a food source but is also known to harbor toxins and cause damage to marine structures. It is native to the waters of Africa, Europe, and South America and was introduced in the waters of North America.

<span class="mw-page-title-main">Chilean mussel</span> Species of bivalve

The Chilean mussel or Chilean blue mussel is a species of blue mussel native to the coasts of Chile from Biobío Region to Cape Horn. Today genomic evidence confirmed that the native Chilean blue mussel is genetically distinct from the Northern Hemisphere M. edulis, M. galloprovincialis and M. trossulus and also genetically different from Mytilus platensis,the other species of smooth shelled mussel from South America.

<i>Mytilus</i> (bivalve) Genus of bivalves

Mytilus is a cosmopolitan genus of medium to large-sized edible, mainly saltwater mussels, marine bivalve molluscs in the family Mytilidae.

<i>Ostrea lurida</i> Species of bivalve

Ostrea lurida, common name the Olympia oyster, after Olympia, Washington in the Puget Sound area, is a species of edible oyster, a marine bivalve mollusk in the family Ostreidae. This species occurs on the northern Pacific coast of North America. Over the years the role of this edible species of oyster has been partly displaced by the cultivation of non-native edible oyster species.

<i>Mytilus trossulus</i> Species of bivalve

Mytilus trossulus, the bay mussel or foolish mussel, is a medium-sized edible marine bivalve mollusc in the family Mytilidae.

<i>Pecten maximus</i> Species of mollusc, also called St James shell

Pecten maximus, common names the great scallop, king scallop, St James shell or escallop, is a northeast Atlantic species of scallop, an edible saltwater clam, a marine bivalve mollusc in the family Pectinidae. This is the type species of the genus. This species may be conspecific with Pecten jacobaeus, the pilgrim's scallop, which has a much more restricted distribution.

<i>Modiolus modiolus</i> Species of bivalve

Modiolus modiolus, common name northern horsemussel, is a species of marine bivalve mollusk in the family Mytilidae.

<i>Pisaster ochraceus</i> Species of starfish

Pisaster ochraceus, generally known as the purple sea star, ochre sea star, or ochre starfish, is a common seastar found among the waters of the Pacific Ocean. Identified as a keystone species, P. ochraceus is considered an important indicator for the health of the intertidal zone.

<span class="mw-page-title-main">Mediterranean mussel</span> Species of bivalve

The Mediterranean mussel is a species of bivalve, a marine mollusc in the family Mytilidae. It is an invasive species in many parts of the world, and also an object of aquaculture.

<i>Ischadium</i> Genus of bivalves

Ischadium is a monotypic genus of mussels in the family Mytilidae. The sole species is Ischadium recurvum, known as the "Hooked mussel" or "Bent mussel". It can be found along the Atlantic coast of North America, ranging from Cape Cod to the West Indies. They are often found growing on Eastern oysters, either intertidal or subtidal. They also attach to other hard substrates, including artificial reefs and dead shells of brackish water clams, Rangia cuneata.

Amygdalum papyrium, common name the Atlantic paper mussel, is a species of marine bivalve mollusc in the family Mytilidae, the true mussels. This species occurs along the Atlantic coast of North America, from Maryland to Florida, as well as in the Gulf of Mexico, from Texas to Mexico.

<i>Pinna carnea</i> Species of bivalve

Pinna carnea, commonly called the amber pen shell, is a species of bivalve mollusc in the family Pinnidae.

References

  1. ↑ Paul Sterry (1997). Collins Complete Guide to British Wildlife. HarperCollins. ISBN   978-0-00-723683-1.
  2. ↑ Mathiesen, Sofie Smedegaard; Thyrring, Jakob; Hemmer-Hansen, Jakob; Berge, Jørgen; Sukhotin, Alexey; Leopold, Peter; Bekaert, Michaël; Sejr, Mikael Kristian; Nielsen, Einar Eg (October 2016). "Genetic diversity and connectivity within Mytilus spp. in the subarctic and Arctic". Evolutionary Applications. 10 (1): 39–55. doi:10.1111/eva.12415. PMC   5192891 . PMID   28035234.
  3. 1 2 Borsa, P.; Rolland, V.; Daguin-Thiebaut, C. (2012). "Genetics and taxonomy of Chilean smooth-shelled mussels, Mytilus spp. (Bivalvia: Mytilidae)" (PDF). Comptes Rendus Biologies. 335 (1): 51–61. doi:10.1016/j.crvi.2011.10.002. PMID   22226163. S2CID   1471569.
  4. 1 2 Mallet, André L.; Carver, Claire E. (1995). "Comparative growth and survival patterns of Mytilus trossulus and Mytilus edulis in Atlantic Canada". Canadian Journal of Fisheries and Aquatic Sciences. 52 (9): 1873–1880. doi:10.1139/f95-780.
  5. 1 2 3 Eggermont, Mieke; Cornillie, Pieter; Dierick, Manuel; Adriaens, Dominique; Nevejan, Nancy; Bossier, Peter; Van Den Broeck, Wim; Sorgeloos, Patrick; Defoirdt, Tom; Declercq, Annelies Maria (2020). "The blue mussel inside: 3D visualization and description of the vascular-related anatomy of Mytilus edulis to unravel hemolymph extraction". Scientific Reports. 10 (1): 6773. Bibcode:2020NatSR..10.6773E. doi:10.1038/s41598-020-62933-9. PMC   7174403 . PMID   32317671.
  6. ↑ Thompson, R.J. (1979). "Fecundity and reproductive effort in the blue mussel (Mytilus edulis), the sea urchin (Strongylocentrotus droebachiensis), and the snow crab (Chionoecetes opilio) from populations in Nova Scotia and Newfoundland". Journal of the Fisheries Research Board of Canada. 36 (8): 955–64. doi:10.1139/f79-133.
  7. 1 2 Bayne, B.; Widdows, J.; Thompson, R. (1976). "Physiological integrations". Marine mussels: their ecology and physiology. New York, NY: Cambridge University Press. pp. 261–91. ISBN   9780521210584.
  8. 1 2 Emmanouil, C; Sheehan, T; Chipman, J (2007-04-20). "Macromolecule oxidation and DNA repair in mussel (Mytilus edulis L.) gill following exposure to Cd and Cr(VI)". Aquatic Toxicology. 82 (1): 27–35. doi:10.1016/j.aquatox.2007.01.009.
  9. ↑ Hrs-Brenko, M.; Calabrese, A. (1976). "The combined effects of salinity and temperature on larvae of the mussel Mytilus edulis". Marine Biology. 4 (3): 224–6. doi:10.1007/BF00393897. S2CID   84634421.
  10. 1 2 Rzepecki, Leszek M.; Hansen, Karolyn M.; Waite, J. Herbert (August 1992). "Characterization of a cystine-rich polyphenolic protein family from the blue mussel Mytilus edulis L." The Biological Bulletin . 183 (1): 123–37. doi:10.2307/1542413. JSTOR   1542413. PMID   29304577.
  11. 1 2 3 van de Koppel, J.; Gascoigne, J. C.; Theraulaz, G.; Rietkerk, M.; Mooij, W. M.; Herman, P. M. J. (2008). "Experimental Evidence for Spatial Self-Organization and Its Emergent Effects in Mussel Bed Ecosystems" (PDF). Science. 322 (5902): 739–742. Bibcode:2008Sci...322..739V. doi:10.1126/science.1163952. PMID   18974353. S2CID   2340587.
  12. 1 2 Nehls, Georg; Witte, Sophia; Büttger, Heike; Dankers, Norbert; Jansen, Jeroen; Millat, Gerald; Herlyn, Mark; Markert, Alexandra; Kristensen, Per Sand; Ruth, Maarten; Buschbaum, Christian; Wehrmann, Achim (2009). "Beds of blue mussels and Pacific oysters" (PDF). In Marencic, Harald; de Vlas, Jaap (eds.). Quality Status Report 2009. Wilhelmshaven: Common Wadden Sea Secretariat.[ permanent dead link ]
  13. 1 2 Côté, Isabelle M; Jelnikar, Eva (1999). "Predator-induced clumping behaviour in mussels (Mytilus edulis Linnaeus)". Journal of Experimental Marine Biology and Ecology. 235 (2): 201–211. doi:10.1016/S0022-0981(98)00155-5.
  14. ↑ Downing, John A.; Downing, William L. (1992). "Spatial Aggregation, Precision, and Power in Surveys of Freshwater Mussel Populations". Canadian Journal of Fisheries and Aquatic Sciences. 49 (5): 985–91. doi:10.1139/f92-110. S2CID   85413789.
  15. ↑ Stokstad, E. (2006). "EVOLUTION: Native Mussel Quickly Evolves Fear of Invasive Crab". Science. 313 (5788): 745a. doi:10.1126/science.313.5788.745a. PMID   16902097. S2CID   5987050.
  16. ↑ Petraitis, Peter S. (June 1987). "Immobilization of the Predatory Gastropod, Nucella lapillus, by Its Prey, Mytilus edulis". Biological Bulletin. 172 (3): 307–14. doi:10.2307/1541710. JSTOR   1541710.
  17. ↑ Freeman, Aaren S.; Meszaros, John; Byers, James E. (2009). "Poor phenotypic integration of blue mussel inducible defenses in environments with multiple predators". Oikos. 118 (5): 758–766. doi:10.1111/j.1600-0706.2008.17176.x. ISSN   1600-0706.
  18. ↑ Robert Butler (1999) The Great Blue Heron (in Google Books)
  19. ↑ Wight, Patty (29 August 2016). "Blue Mussels in Decline in Gulf of Maine". www.mainepublic.org.
  20. ↑ Vasich, Tom (9 August 2016). "Why are New England's wild blue mussels disappearing?". UCI News.
  21. ↑ Doney, Scott C.; Busch, D. Shallin; Cooley, Sarah R.; Kroeker, Kristy J. (2020). "The Impacts of Ocean Acidification on Marine Ecosystems and Reliant Human Communities". Annual Review of Environment and Resources. 45: 83–112. doi: 10.1146/annurev-environ-012320-083019 .
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