<< Previous Next >>

Corbicula fluminalis


Corbicula fluminalis
Photo Information
Copyright: Roberto Innocenzi (cobra112) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2093 W: 75 N: 6382] (43366)
Genre: Animals
Medium: Color
Date Taken: 2010-01-29
Categories: Molluscs
Camera: Nikon D40X, Sigma 105mm 1:2.8 EX DG Macro
Photo Version: Original Version
Date Submitted: 2010-01-29 5:12
Viewed: 4095
Points: 34
[Note Guidelines] Photographer's Note
Kingdom: Animalia

Phylum: Mollusca

Class: Bivalvia

Subclass:Heterodonta

Order: Veneroida

Suborder:Sphaeriacea

Superfamily:Corbiculoidea

Family: Corbiculidae

Genus: Corbicula

Species:C. fluminea

Corbicula fluminea is a species of freshwater clam, an aquatic bivalve mollusk in the family Corbiculidae. This species is of originally mainly Asian origin and thus it is often commonly called Asian clam or Asiatic Clam In the aquarium and koi pond trade it is often called Golden Clam or Golden Freshwater Clam. In Southeast Asia it is known as the prosperity clam or good luck clam. This species has been introduced into many parts of the world, including North America and Europe. Right after reaching maturity these clams produce eggs, followed by sperm. Even later, they produce eggs and sperm simultaneously. They can self-fertilize, and release up to 2,000 juveniles per day, and more than 100,000 in a lifetime. Juveniles are only 1mm long when discharged, and take one to four years to reach maturity. At this time they are about one centimeter long. Adults can reach a length of about 5 cm. The outside of the shell is normally yellow-green with concentric rings. The color can flake, leaving white spots. The shells are lightly purple on the inside. They feed primarily on phytoplankton (algae), which they filter from the sandy or muddy bottom of streams, lakes, or canals. "An invasive clam, Corbicula fluminea, appeared at Lake Tahoe in 2002 in spotty numbers. But in the past two years, densities of the inch-long clam have jumped 100-fold. Waste from the clams, in turn, has helped trigger blooms of bright green algae". Researchers have recently found that since the early 1990's Lake Tahoe and other California and Nevada lakes have been warming at twice the rate of the surrounding atmosphere.. The USGS has concluded, C. fluminea is likely to continue to expand it's North American range until it reaches it's lower temperature tolerance. Recently German researchers have determined that a "strong, positive effect of moderate winter warming on the clams' fitness is probably one reason for the recent invasion success of C. fluminea in the northern hemisphere. The primary economic/social impact of the invasion of C. fluminea has been billions of dollars in costs associated with clogged water intake pipes, associated with power plants, among others. Ecologically C. fluminea contributes to declines and replacement of highly vulnerable, already threatened native clams. This clam originally occurs in Russia, Thailand, the Philippines, China, Taiwan, Korea, Japan, but also in parts of Africa. C. fluminea was probably brought to North America at the latest in 1924, by Asian immigrants who used the clams as a food source. The clams are abundant in the Albemarle region of North Carolina, as well as other areas along the east coast. It was first found in the Rhine in the late 1980s and subsequently found its way into the Danube through the Rhine-Main-Danube Canal. It reached the Elbe in 1998 at the latest. It is non-indigenous in Elbe in Bohemia (Czech Republic) since 2000 and it is spreading is now in rivers of Portugal, like Minho River. There are in fact two species present in introduced populations, C. fluminea and Corbicula fluminalis. However, the two species are often mixed together. The names themselves are sometimes confused in the literature (e.g. by being called '"Corbicula fluminata"). Care needs to be taken in order to properly distinguish the two species. The ratio of width and height in C. fluminea is on average 1.1. In C. fluminalis it is smaller (0.97); still, there is much variation and considerable overlap in shape. Most easily, they can be distinguished by the amount of ribs on the shell; C. fluminea has 7 to 14 ribs per cm, C. fluminalis 13 to 28[. This character is already clearly recognizable (albeit only by direct comparison) in very small (5 mm diameter) specimens. In addition, when viewed from the side (looking at the opening between the shells), C. fluminalis is rounder, almost heart-shaped, while C. fluminea has a slightly flatter shape like a teardrop with a notched broad end. Small specimens of C. fluminalis are almost spherical, while those of C. fluminea are decidedly flattened. All these differences except the rib number are a consequence of C. fluminalis having a markedly more swollen, pointed and protruding umbo (the oldest part of the shell valves, close to the ligament holding them together).

boreocypriensis, Hormon_Manyer, anel, jimmj63 has marked this note useful
Only registered TrekNature members may rate photo notes.
Add Critique [Critiquing Guidelines] 
Only registered TrekNature members may write critiques.
Discussions
None
You must be logged in to start a discussion.

Critiques [Translate]

  • Great 
  • lousat Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 6595 W: 89 N: 15659] (65489)
  • [2010-01-29 5:43]

Ciao Roby,penso che avrai spiazzato tutti con questa conchiglia di fiume...una bella sorpresa che su TN mancava,anche se gli esseri acquatici sono da sempre poco apprezzati qui...invece per me e' un'ottimo contributo e soprattutto un soggetto fresco di stagione,ideale per esercitarsi con la nuova lente...bravo,buona serata,Luciano

  • Great 
  • hansh Gold Star Critiquer/Gold Note Writer [C: 277 W: 1 N: 741] (2762)
  • [2010-01-29 6:58]

Hello Roberto.

A nice capture of this shelf.
I can't help you with the ID but your photo looks very nice and sharp.

Gr. Hans

Ciao Roberto,
la tua identificazione potrebbe essere quella giusta dal momento che si tratta di una conchiglia di acqua dolce presente in pianura Padana, la macro è suggestiva per la particolare luce radente che hai colto, la definizione è ottima, molto bella annche la composizione che mostra due conchiglie con una prospettiva diversa.
Grazie e complimenti
Ciaom Maurizio

hello Roberto
great sharpness and good details
beautiful shell
greeting lou

Hello Cobra,

A beautiful capture with lovely colors, shapes & details. Well taken & presented.

TFS & regards.

Umar

  • Great 
  • horias Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 837 W: 58 N: 2084] (11033)
  • [2010-01-29 8:12]

Roberto
Wonderful capture,great sharp details and interesting shot!
Horia

Ciao Roberto,
Una composizione strana e interessante, suficentemente elementi conunción è abbastanza diversificata per generare la sensazione di un paesaggio molto piccolo. Buono lavoro, grande manipolazione della luce e dell'ombra. TFS / regards, Jesús

  • Great 
  • nglen Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 2883 W: 30 N: 9683] (36145)
  • [2010-01-29 11:16]

Hi Roberto. I to would not now the ID. but you have taken a fine close up showing the shells markings.Which you have taken with fine detail and warm colours. well taken TFS.
Nick..

  • Great 
  • siggi Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 3097 W: 109 N: 12399] (52850)
  • [2010-01-29 12:00]

Hello Roberto,
I like the design and the way you have produced here. Nice effect and a very good shot.Best regards Siggi

Hello Roberto
Lovely capture and very interesting habitat for this specimen!
Congratulation!
Mariana

Original especie poco vista por aquí y mejor trabajo con el color.
Buen fin de semana Roberto.

Ciao amico Roberto,

Great capture of this wonderful shell of a lamellibranch from very nice vantage point with perfect focus, excellent DOF, great clarity and delightful composition.
TFS and have a nice night and WE MF!
Cheers,

Bayram

Ciao Roberto,
Unique and very interesting capture, nice underwater shot with great DOF, details and sharpness. Pleasant image to my eyes.
Grazie (e forza Milan!), Ladislao

Ciao Roberto, che strana cosa che hai tirato fuori, strana ma bella, grande esercizio con la nuova lente, ne vedremo delle belle, bravo, ciao Silvio
PS allenati che sarà dura:) grrrr:)

  • Great 
  • foozi Gold Star Critiquer/Gold Note Writer [C: 2791 W: 0 N: 6696] (25839)
  • [2010-01-31 4:38]

Hi Roberto,
very special presentation in good light. The pattern and clarity is great. I love the way you preserve the sand and its surroundings.
Very sharp shot.

regards,
Foozi

  • Great 
  • anel Gold Star Critiquer/Gold Note Writer [C: 3053 W: 3 N: 8715] (40574)
  • [2010-01-31 4:51]

Bonjour Roberto,
Une très belle image de coquillages fluviatiles, un sujet très peu montré sur TN. Surprise de lire qu'il s'agit d'une espèce asiatique..il y a de plus en plus de créatures d'autres continents dans nos rivières, ici par example des crabes d'origine américaine. L'image est de grande beauté, la lumière sur le coquillage met en valeur ses rayures d'une manière presque tridimensionnelle. Bravo
Bon dimanche
Anne

ciao roberto

ti confermo quello che hai scritto su questo mollusco invasivo, ne ho pescati alcuni esemplari nel lago di annecy, in savoia, dalle acque particolarmente limpide. ne sono ststi segnalati anche in scozia, dove evidentemente qualcuno li ha portati.
quelle che ho io sono leggermente più scuri (è solo il periostraco) ma le dimensioni sono simili.

gran bella foto, appena riesco illustro un altro esempio di specie invasiva, questa volta marina.

ciao, giacomo

Calibration Check
















0123456789ABCDEF