Rapana venosa

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Rapana venosa
Rapana Black Sea 2008 G1.jpg
A live individual of Rapana venosa retracted into the shell, with the operculum closing the aperture
Rapana venosa 01.JPG
Five views of a shell of R. venosa
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Neogastropoda
Family: Muricidae
Genus: Rapana
Species:
R. venosa
Binomial name
Rapana venosa
(Valenciennes, 1846)
Synonyms [1]

Purpura venosaValenciennes, 1846 (basionym)
Rapana marginataValenciennes, 1846
Rapana pechiliensisGrabau & King, 1928
Rapana thomasianaCrosse, 1861

Contents

Rapana venosa, common name the veined rapa whelk or Asian rapa whelk, is a species of large predatory sea snail, a marine gastropod mollusc or whelk, in the family Muricidae, the rock shells.

This large sea snail has become an invasive species in many different localities around the world.

Shell description

Ventral (left) and dorsal (right) views of a shell of Rapana venosa Rapana venosa.jpg
Ventral (left) and dorsal (right) views of a shell of Rapana venosa
Apical view of the shell of Rapana venosa Rapana venosa shell 2.png
Apical view of the shell of Rapana venosa
Veined rapa whelk on the stamp of the Soviet Union The Soviet Union 1975 CPA 4480 stamp.jpg
Veined rapa whelk on the stamp of the Soviet Union

The shell of Rapana venosa is globose (rounded) and heavy, possessing a very short spire, a large body whorl, a strong columella and a deep umbilicus. The aperture is large and roughly ovate. Ornamentation is present externally as axial ribs, smooth spiral ribs ending in blunt knobs at both the shoulder and body whorl, and internally as small elongated teeth disposed along the outer lip margin. The external color varies from gray to reddish-brown, with dark brown dashes on the spiral ribs. Some specimens may have distinctive black/dark blue vein-like coloration patterns throughout the inner portions of the shell, usually originating from each individual tooth at the outer lip. A diagnostic feature for this species is the deep orange color found in the aperture and on the columella. The height of the shell can reach up to 180  mm (about 7 in). [2] [3]

Distribution

This species is native to the marine and estuarine waters of the western Pacific, from the Sea of Japan, Yellow Sea, East China Sea and the Bohai Sea. [2]

Rapana venosa is included in Russia's Red Book as threatened with extinction. The original known habitat for this species was the Far East, but since 1947 it has been found in the Black Sea, and its shell became a popular souvenir in Crimea. Recently this species has been found as an exotic in the Chesapeake Bay, on the eastern coast of the United States.

Nonindigenous distribution

According to some authors, it appears to be the case that the spreading of this species outside its natural range has been made possible by the planktonic larval stage being transported along with ballast water in the hulls of ships, or that egg masses may have been transported with products of marine farming. [4]

Rapa whelks were first found in the Black Sea in the 1940s. Within a decade this mollusk had spread along the Caucasian and Crimean coasts and moved into the Sea of Azov. From 1959 to 1972, its range extended into the northwest Black Sea, to the coastlines of Romania, Bulgaria and Turkey. These whelks have become established in the Adriatic and Aegean seas, and have also been found in the Tyrrhenian sea, [5] on the Northern Atlantic coast of France, and the southeast coast of South America, in Uruguay and the Rio de La Plata estuary (including Samborombon Bay), and in Argentina. [6] [7] In the United States the first specimen discovered was in August 1998 by members of the Virginia Institute of Marine Science (VIMS) Trawl Survey Group in Hampton Roads, Virginia. The species is now widely distributed and established in Chesapeake Bay. [2]

Rapana venosa is considered among the 100 worst alien species in Europe in the DAISIE European Invasive Alien Species Gateway, [8] one of two marine gastropods on the list. [8] It is considered as about the 52nd the worst alien species in Europe. [9]

Ecology

Habitat

Veined rapa whelks favor compact sandy bottoms, in which they can burrow almost completely. The native habitat of this species is a region of wide annual temperature ranges, comparable to other localities. Fleeing cold waters in the winter, this species may migrate to warmer, deeper waters, thereby evading cool surface waters. This fertile sea snail is extremely versatile, tolerating low salinities, water pollution and oxygen deficient waters. [2]

Feeding habits

Veined rapa whelks are carnivorous selective predatory gastropods whose main diet consists of a variety of other mollusk species, mainly epifaunal bivalves such as oysters ( Crassostrea virginica ) and mussels ( Mytilus galloprovincialis , Modiolus and Geukensia ), but also clams ( Anadara inaequivalvis , Chamelea gallina , Tapes philippinarum , Venus verrucosa , and the northern quahog Mercenaria mercenaria ). Prey are chosen by the whelk according to their species and size. [10] [11] [12] Most snails feed by drilling a hole into their bivalve prey, but rapa whelks usually smother their prey by wrapping around the hinged region of the shell and feed by introducing their proboscis between the opened valves. The whelk can also secrete a thick mucus that may or may not contain biotoxins to weaken the prey. [12] Shell drilling, however, is also not unknown in this species. [13]

Life cycle

A shell of Veined rapa whelk, side by side with its egg case Rapana venosa eggs.jpg
A shell of Veined rapa whelk, side by side with its egg case

Rapana venosa is dioecious, which means each individual organism belonging to this species is distinctly male or female. [11] In this species' native range, mating occurs for extended periods of time, mainly during the winter and spring. [3] It reproduces by internal fertilization, [14] after which it lays clusters of egg cases that resemble small mats of white to yellow shag carpet, [2] [3] mainly during spring and summer. [11] One adult female can lay multiple egg cases throughout the season. [8] Each cluster contains 50-500 egg cases, and each egg case may contain 200-1000 eggs. [3] The pelagic veliger larvae (a larval form common to various marine and fresh-water gastropod and bivalve mollusks) [15] then hatch, persisting in the water column for 14 to 80 days [11] and feeding primarily on plankton. [8] They eventually settle on the ocean floor where they develop into hard-shelled snails. Growth is rapid over the first year of life, and reproduction occurs from the second year onwards. Large specimens may be over ten years old. [2]

Reasons for the survival of this invasive species

It is known that the abundance of prey, the lack of competition from other gastropod species, as well as the absence of direct predators of R. venosa may be some of the factors that contributed to the successful establishment of new populations of this sea snail outside its native range. [3] The thick strong shell of the rapa whelk is arguably its strongest advantage over native whelks, because rapas can easily prey on local whelks, whereas local whelks are unable to successfully attack rapas. The thick shell also means that predators such as sea turtles are unable to feed on the invasive species, and can only feed on local whelk populations. It is suggested that once the rapa whelk reaches adulthood, it exists unchecked in the local population, and can consume and reproduce freely. [3] The Veined rapa whelk is also highly tolerant to wide variations in salinity and oxygen concentration, [11] a fact that may also help to explain its success as an invader of marine coastal and brackish ecosystems. In its native range Rapana venosa shows high temperature tolerance, being able to withstand temperatures varying from 4 to 27 °C (39.2 - 80.6 °F). [3]

Impact of introduction

Veined rapa whelks have caused significant changes in the ecology of bottom-dwelling organisms, and have become marine pests in the Black Sea. Although scientists are not completely aware of the impacts of the whelk, they are very concerned about its potential impact on native Bay species. Studies are currently under way to help determine the whelk's spread in Chesapeake Bay, so that scientists can develop a model that will define potential impacts to the Bay's ecosystem. [2]

Imposex

The imposex phenomenon has been observed in the veined rapa whelk in Chesapeake Bay. [16] Imposex is characterized by the development of masculine sexual organs in female individuals as a consequence of exposure to organic tin compounds, such as tributyltin (TBT). Such compounds are biocide and antifouling agents, commonly mixed in paints to prevent marine encrustations on boats and ships. For this reason, it is not uncommon for high concentrations of such compounds to be present in the sea water near shipyards and docking areas, consequently exposing the nearby marine life to its possibly harmful effects. [17] This unnatural development of male reproductive organs, however, has shown no negative effects on populations of this species, and no loss of reproductive capabilities of female R. venosa as a consequence of Imposex has been observed so far. [16]

Related Research Articles

<span class="mw-page-title-main">Muricidae</span> Family of molluscs

Muricidae is a large and varied taxonomic family of small to large predatory sea snails, marine gastropod mollusks, commonly known as murex snails or rock snails. With over 1,700 living species, the Muricidae represent almost 10% of the Neogastropoda. Additionally, 1,200 fossil species have been recognized. Numerous subfamilies are recognized, although experts disagree about the subfamily divisions and the definitions of the genera. Many muricids have unusual shells which are considered attractive by shell collectors and by interior designers.

<span class="mw-page-title-main">Whelk</span> Common name that is applied to various kinds of sea snail

Whelks are any of several carnivorous sea snail species with a swirling, tapered shell. Many are eaten by humans, such as the common whelk of the North Atlantic. Most whelks belong to the family Buccinidae and are known as "true whelks." Others, such as the dog whelk, belong to several sea snail families that are not closely related.

Imposex is a disorder in sea snails caused by the toxic effects of certain marine pollutants. These pollutants cause female sea snails to develop male sex organs such as a penis and a vas deferens.

<i>Urosalpinx cinerea</i> Species of gastropod

Urosalpinx cinerea, common name the eastern oyster drill, Atlantic oyster drill, or just Oyster Drill, is a species of small predatory sea snail, a marine gastropod mollusk in the family Muricidae, the murexes or rock snails.

<i>Dicathais</i> Genus of gastropods

Dicathais is a genus of predatory sea snails, marine gastropod molluscs in the family Muricidae, the rock snails. This genus is monotypic; the only species in it is Dicathais orbita, common name the white rock shell or cart-rut shell, found round the coasts of Australia and New Zealand.

<i>Rapana</i> Genus of gastropods

Rapana is a genus of large predatory sea snails, marine gastropod mollusks in the family Muricidae, the rock snails.

<i>Stramonita haemastoma</i> Species of gastropod

Stramonita haemastoma, common name the red-mouthed rock shell or the Florida dog winkle, is a species of predatory sea snail, a marine gastropod mollusc in the family Muricidae, the rock snails.

<i>Neptunea arthritica</i> Species of gastropod

Neptunea arthritica is a species of sea snail, a marine gastropod mollusk in the family Buccinidae, the true whelks.

<i>Nucella emarginata</i> Species of gastropod

Nucella emarginata, common name the emarginate dogwinkle, is a species of medium-sized predatory sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails.

<i>Nucella lamellosa</i> Species of gastropod

Nucella lamellosa, commonly known as the frilled dogwinkle or wrinkled purple whelk, is a species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails. This species occurs in the eastern Pacific Ocean, its range extending in the intertidal zone from the Aleutian Islands southward to central California.

<i>Nucella ostrina</i> Species of gastropod

Nucella ostrina, the northern striped dogwinkle, is a species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails. Other common names for this mollusk include emarginate dogwinkle, short-spired purple dogwinkle, striped dogwinkle, ribbed dogwinkle, emarginate whelk, ribbed rock whelk, rock thais, short-spired purple snail and rock whelk.

<i>Rapa rapa</i> Species of gastropod

Rapa rapa, common name the bubble turnip, is a species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails.

<i>Rapana rapiformis</i> Species of gastropod

Rapana rapiformis is a species of sea snail, a marine gastropod mollusc in the family Muricidae, the murex snails or rock snails.

<i>Rapa</i> (gastropod) Genus of gastropods

Rapa is a genus of sea snails, marine gastropod mollusks in the family Muricidae, the murex snails or rock snails.

<i>Kelletia kelletii</i> Species of gastropod

Kelletia kelletii, common name Kellet's whelk, is a species of large sea snail, a whelk, a marine gastropod mollusc in the family Buccinidae, the true whelks.

Venosa is a town and comune in Italy.

<i>Mytilaster minimus</i> Species of bivalve

Mytilaster minimus, the dwarf mussel or variable mussel, is a species of mussel from sea and brackish waters of the Mediterranean Sea.

<i>Tenguella marginalba</i> Species of gastropod

Tenguella marginalba is a species of sea snail, a marine gastropod mollusc in the family Muricidae, the murex snails or rock snails. It is commonly known as the mulberry whelk and is found in shallow waters in the Indo-Pacific and around the north and east coasts of Australia.

<i>Lirabuccinum dirum</i> Species of mollusc

Lirabuccinum dirum, commonly known as the dire whelk, the spindle shell or the spindle whelk, is a species of sea snail, a marine gastropod mollusk in the family Buccinidae, the true whelks. It used to be known as Searlesia dira and Buccinum dirum before being transferred to the genus Lirabuccinum.

Maritimimonas is a Gram-negative and aerobic genus of bacteria from the family of Flavobacteriaceae with one known species. Maritimimonas rapanae has been isolated from the gut of the whelk Rapana venosa from the South Sea in Korea.

References

This article incorporates public domain text (a public domain work of the United States Government) from reference [2]

  1. ↑ Rapana venosa (Valenciennes, 1846). Retrieved through: World Register of Marine Species  on 2 April 2010.
  2. 1 2 3 4 5 6 7 8 Myriah Richerson. 2008. Rapana venosa. USGS Nonindigenous Aquatic Species Database, Gainesville, FL. <https://nas.er.usgs.gov/queries/FactSheet.asp?speciesID=1018> Revision Date: 4/24/2006
  3. 1 2 3 4 5 6 7 Mann, R.; Occhipinti, A.; Harding, J. M., eds. (2004). Alien Species Alert: Rapana Venosa (veined whelk) (PDF). ICES Cooperative Research Report No 264. ICES. ISBN   978-87-7482-010-9. Archived from the original (PDF) on 2011-12-13. Retrieved 2012-01-31.
  4. ↑ Harding, J. M. (2001). Rapana venosa veined rapa whelk, Asian rapa whelk (PDF). Guide to Marine Invaders in the Gulf of Maine. Salem Sound Coastwatch.
  5. ↑ Paolini, P. (1987). "Nuova segnalazione di Rapana venosa (Valenciennes, 1846) (Gastropoda, Muricidae) nell'alto Tirreno". Quaderni del Museo di Storia Naturale di Livorno (in Italian). 8: 111–112. ISSN   1126-7801.
  6. ↑ Pastorino, G.; et al. (2000). "Rapana venosa (Valenciennes, 1846) (Mollusca: Muricidae): A new gastropod in South Atlantic waters". Journal of Shellfish Research. 19 (2): 897–899. ISSN   0730-8000.
  7. ↑ Giberto, D. A.; et al. (2006). "The invasive rapa whelk Rapana venosa (Valenciennes 1846): status and potential ecological impacts in the Río de La Plata Estuary, Argentina-Uruguay". Journal of Shellfish Research. 25 (3): 941–946. doi:10.2983/0730-8000(2006)25[919:TIRWRV]2.0.CO;2. hdl: 1834/1572 .
  8. 1 2 3 4 DAISIE European Invasive Alien Species Gateway. Rapana venosa. Last updated 30 October 2006, accessed 3 April 2010.
  9. ↑ Nentwig, Wolfgang; Bacher, Sven; Kumschick, Sabrina; Pyšek, Petr; Vilà, Montserrat (2017-12-18). "More than "100 worst" alien species in Europe". Biological Invasions. 20 (6): 1611–1621. doi: 10.1007/s10530-017-1651-6 . hdl: 10261/158710 . ISSN   1387-3547.
  10. ↑ Harding, J. M.; Mann, R.; Moeller, P.; Hsia, M. S. (2009). "Mortality of the veined rapa whelk, Rapana venosa, in relation to a bloom of Alexandrium monilatum in the York River, United States". Journal of Shellfish Research. 28 (2): 363–367. doi:10.2983/035.028.0219. S2CID   86752900.
  11. 1 2 3 4 5 Savini, D.; Occhipinti-Ambrogi, A. (2006). "Consumption rates and prey preference of the invasive gastropod Rapana venosa in the Northern Adriatic Sea". Helgoland Marine Research. 60 (2): 153–159. doi: 10.1007/s10152-006-0029-4 . ISSN   1438-3888.
  12. 1 2 "Rapana venosa (Valenciennes, 1846) (Mollusca, Gastropoda, Muricidae" (in Italian). Santa Croce, Venezia: Museo di Storia Naturale di Venezia. Archived from the original on 22 July 2011. Retrieved 2 April 2010.
  13. ↑ "Global Invasive Species Database". Rapana venosa (mollusc). National Biological Information Infrastructure (NBII) & IUCN/SSC Invasive Species Specialist Group (ISSG). 2006. Retrieved 2 April 2010.
  14. ↑ Saglam, H.; Duzgunes, E. (2007). "Deposition of egg capsule and larval development of Rapana venosa (Gastropoda: Muricidae) from the south-eastern Black Sea". Journal of the Marine Biological Association of the United Kingdom. 87 (4): 953–957. doi:10.1017/s0025315407056330. S2CID   86797777.
  15. ↑ Brusca, R. C.; Brusca, G. J. (2003). Invertebrates (2nd ed.). Sinauer Associates, Inc. p. 936. ISBN   978-0-87893-097-5.
  16. 1 2 Mann, R.; Harding, J. M.; Westcott, E. (2006). "Occurrence of imposex and seasonal patterns of gametogenesis in the invading veined rapa whelk Rapana venosa from Chesapeake Bay, USA" (PDF). Marine Ecology Progress Series. 310: 129–138. doi: 10.3354/meps310129 .
  17. ↑ Castro, Í. B.; et al. (2008). "Imposex in endemic volutid from Northeast Brazil (Mollusca: Gastropoda)" (PDF). Brazilian Archives of Biology and Technology. 51 (5): 1065–1069. doi: 10.1590/s1516-89132008000500024 . ISSN   1516-8913.

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