Overview

Distribution

Gulf of St. Lawrence (unspecified region), Magdalen Islands (from Eastern Bradelle valley to the west, as far as Cape North, including the Cape Breton Channel), lower St. Lawrence estuary, Prince Edward Island (from the northern tip of Miscou Island, N.B. to Cape Breton Island south of Cheticamp, including the Northumberland Strait and Georges Bay to the Canso Strait causeway), western slope of Newfoundland, including the southern part of the Strait of Belle Isle but excluding the upper 50m in the area southwest of Newfoundland and including the southwestern slope of NL; Cobscook Bay to Cape Cod
  • North-West Atlantic Ocean species (NWARMS)
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Source: World Register of Marine Species

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Ecology

Habitat

infralittoral and circalittoral of the Gulf and estuary
  • North-West Atlantic Ocean species (NWARMS)
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Source: World Register of Marine Species

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Depth range based on 24 specimens in 1 taxon.
Water temperature and chemistry ranges based on 11 samples.

Environmental ranges
  Depth range (m): 0 - 62
  Temperature range (°C): 2.228 - 27.099
  Nitrate (umol/L): 0.086 - 10.807
  Salinity (PPS): 27.809 - 39.009
  Oxygen (ml/l): 4.657 - 7.473
  Phosphate (umol/l): 0.085 - 0.640
  Silicate (umol/l): 1.887 - 7.273

Graphical representation

Depth range (m): 0 - 62

Temperature range (°C): 2.228 - 27.099

Nitrate (umol/L): 0.086 - 10.807

Salinity (PPS): 27.809 - 39.009

Oxygen (ml/l): 4.657 - 7.473

Phosphate (umol/l): 0.085 - 0.640

Silicate (umol/l): 1.887 - 7.273
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Dispersal

Depth range

0-20
  • Schotte, M., B.F. Kensley, and S. Shilling. (1995 onwards). World list of Marine, Freshwater and Terrestrial Crustacea Isopoda. National Museum of Natural History Smithsonian Institution: Washington D.C., USA.
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Source: World Register of Marine Species

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Associations

Plant / grows inside
Limnoria lignorum grows inside submerged timber of Trees

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Wikipedia

Limnoria lignorum

Limnoria lignorum, commonly known as the gribble, is a species of isopod in the family Limnoriidae. It is found in shallow water in the North Atlantic and North Pacific Ocean where it tunnels into wood and attacks and destroys submerged wooden structures.

Description[edit]

Limnoria lignorum grows to a maximum length of 5.6 mm (0.22 in) but a more usual size range is 1 to 4 mm (0.04 to 0.16 in). It is a yellowish colour and is about three times as long as it is broad.[2] It has a woodlouse-like body with fourteen segments. It bores its way into wood to a depth of about 12 mm (0.5 in).[3]

Distribution[edit]

Limnoria lignorum is found in the boreal and temperate seas of the northern Atlantic Ocean and North Sea and it is also known from the west coast of North America. Its range extends from Norway southwards to France,[4] and from the Gulf of St Lawrence southwards to Cobscook Bay and Cape Cod. Its depth range is from the littoral zone to a depth of about 20 m (66 ft)[1] It is unclear from exactly where it originated because it has spread widely, aided in its dispersal by tunnelling into the hulls of wooden ships and inside floating driftwood. It was first described by the German zoologist Martin Rathke in 1799 from a location is Norway.[2]

Biology[edit]

Gribbles tunnelling

Limnoria lignorum is a wood borer and in favourable conditions can be present in large numbers, with densities of as many as four hundred individuals per 1 cu in (16.4 cm3) of wood. The isopods are very small and the damage is at first confined to near the surface of the wood. The tunnels are about 1 mm (0.04 in) in diameter and usually follow the line of less-lignified material. As the upper layer of wood crumbles away under this onslaught, deeper parts of the timber are attacked and in time, pilings and other wooden structures are eaten away.[5]

Limnoria lignorum ingest wood fragments as they burrow. They do not seem to house bacteria in their gut that are able to digest lignin, as is the case in some other wood-boring species, and seem to rely on their cellulolytic enzymes to digest cellulose. They may also feed on fungal hyphae directly or may consume them indirectly in wood that is already softened as a result of attack by fungi and bacteria.[6]

The eggs of Limnoria lignorum are retained by the female in the brood pouch under her thorax. The eggs hatch directly into mancae, juveniles that are miniature versions of the adult, which means there is no free-living larval stage to aid dispersal of this species. It has been shown that the water temperature influences reproductive processes. Little tunnelling or reproduction takes place during the winter but activity starts earlier in the year and continues later, and the young develop more rapidly under the warmer conditions that exist near the exit of a water cooling system.[7]

References[edit]

  1. ^ a b Schotte, Marilyn (2013). "Limnoria lignorum (Rathke, 1799)". World Register of Marine Species. Retrieved 2014-03-19. 
  2. ^ a b "Limnoria lignorum". Invasive Species Compendium. CABI. 2013-09-25. Retrieved 2014-03-19. 
  3. ^ "Gribble". Encyclopædia Britannica. Retrieved 2014-03-19. 
  4. ^ de Kluijver, M. J.; Ingalsuo, S. S. "Limnoria lignorum". Macrobenthos of the North Sea: Crustacea. Marine Species Identification Portal. Retrieved 2014-03-19. 
  5. ^ Johnson, Martin W. (1935). "Seasonal Migrations of the Wood-Borer Limnoria lignorum (Rathke) at Friday Harbor, Washington". Biological Bulletin 69 (3): 427–438. JSTOR 1537402. 
  6. ^ Daniel, G.; Nilsson, T.; Cragg, S. (1991). "Limnoria lignorum ingest bacterial and fungal degraded wood". Holz als Roh- und Werkstoff 49 (12): 488–490. doi:10.1007/BF02619480. 
  7. ^ Eltringham, S. K. (1967). "The Effects of Temperature on the Development of Limnoria Eggs (Isopoda: Crustacea)". Journal of Applied Ecology 4 (2): 521–529. JSTOR 2401353. 
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