AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Limnoria lignorum [WoRMS] | |
Authority | (Rathke, 1799) | |
Family | Limnoriidae | |
Order | Isopoda | |
Class | Malacostraca | |
Phylum | Arthropoda | |
Synonym (?) | ||
Sub-species level (?) | Not entered |
Native origin (?) | Ocean: Pacific |
Life form / Life stage (?) |
|
Sociability / Life stage (?) |
|
Reproductive frequency (?) | Iteroparous |
Reproductive type (?) | Sexual References: Eltringham, S. K., Hockley, A. R. 1961. Migration and reproduction of the wood‐boring isopod, Limnoria, in Southampton water. Limnology and Oceanography, 6(4), pp. 467-481. Comments: These wood-boring organisms are generally found in heterosexual pairs. Females tend to position themselves at the head of a tunnel with the male behind. The number of eggs laid can be from 10 to 23 eggs, but numbers vary from region to region. The eggs are incubated in a brood pouch formed of four pairs of overlapping oostegites. Once hatched, parents (usually the females) remain in the inner regions of the burrows to protect their brood. Juveniles are thus well sheltered from any adverse outside influences and benefit from this form of extended parental care. |
Developmental trait (?) | Brooding Direct development References: Eltringham, S. K., Hockley, A. R. 1961. Migration and reproduction of the wood‐boring isopod, Limnoria, in Southampton water. Limnology and Oceanography, 6(4), pp. 467-481. Comments: The eggs of L. 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. Females of this species carry around 22 large eggs in their marsupium or pouch between the front legs. The eggs are nearly 1/4 the width of the body. They do not hatch into a larval stage but instead hatch like small adults which begin burrowing. Therefore gribble colonies in wood are quite localized and spread slowly across the wood surface as they reproduce and start more burrows. |
Characteristic feeding method / Life stage (?) |
References (not structured): Daniel, G., Nilsson, T., Cragg, S. 1991. Limnoria lignorum ingest bacterial and fungal degraded wood. Holz als Roh-und werkstoff, 49(12), pp. 488-490. Comments: L. lignorum ingest wood fragments as they burrow. They do not seem to house bacteria in their gut that are able to digest lignin. 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 |
Mobility / Life stage (?) |
Comments: L. 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 in3 (16.4 cm3) of wood. It bores its way into wood to a depth of about 12 mm. |
Salinity tolerance range (?) | Exact range: 6 - 16 References: Eltringham, S. K. 1961. The effect of salinity upon the boring activity and survival of Limnoria (Isopoda). Journal of the Marine Biological Association of the United Kingdom, 41(3), pp. 785-797. Comments: Low salinity was the direct cause of reduced boring activity and boring ceased below 10‰. Over 15-20 days a salinity of 6‰ proved fatal for Limnoria. Eltringham (1961a) found no reduction in survival in concentrated salinities up to a value of 48‰, the highest salinity examined. Although no long-term experiments were conducted, generally, areas with uniformly low salinities (below 10‰) and those having wide ranges of salinity (0-35‰) are considered as unfavorable for the development and establishment of Limnoria. |
Habitat modifying ability potential (?) | Allogenic ecosystem engineers References: Daniel, G., Nilsson, T., Cragg, S. 1991. Limnoria lignorum ingest bacterial and fungal degraded wood. Holz als Roh-und werkstoff, 49(12), pp. 488-490. Comments: 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. |
Toxicity / Life stage (?) | Not relevant |
Bioaccumulation association (?) | Unknown Comments: Not available. |
Known human health impact? | Known Comments: Harmless. |
Known economic impact? | Known References: CABI (2023) Limnoria lignorum (gribble). Available at: https://www.cabidigitallibrary.org/doi/10.1079/cabicompendium.109146 (Accessed: 13 August 2024). Comments: Since the nineteenth century the damage caused by this species to wooden structures has been considered as a serious economic issue and since the mid-twentieth century the species has been viewed as a serious pest. In many areas, such as Kamchatka (Avacha Bay), the Barents Sea (Kola Bay), Vladivostok and the Sea of Japan (De-Casri Bay) L. lignorum has been reported as destroying wooden constructions at a rate of 0.4-1.4 cm per year. |
Known measurable environmental impact? | Known References: CABI (2023) Limnoria lignorum (gribble). Available at: https://www.cabidigitallibrary.org/doi/10.1079/cabicompendium.109146 (Accessed: 13 August 2024). Comments: Limnorids process wood debris, releasing energy stored in submerged wood and drift wood. Colonies create a complex of interconnecting tunnels, which usually have a series of pinhole-sized punctures along their length, are about 1 mm in diameter and may be found just below the surface of the infected wood. These tunnels are numerous and give the wood a characteristic lace-like appearance and a sponge-like structure. The tunnels of the borer create niches for other organisms including annelids, marine tardigrades and other small crustaceans. |
Included in the Target Species list? | No References: HELCOM, 2009. Alien Species and Ballast Water [PDF] Available at: https://archive.iwlearn.net/helcom.fi/stc/files/shipping/Table_2_Alienspecies_%20lists_2009.pdf [Accessed 1 July 2024]. |
Association with vessel vectors (?) | Biofouling References: CABI (2023) Limnoria lignorum (gribble). Available at: https://www.cabidigitallibrary.org/doi/10.1079/cabicompendium.109146 (Accessed: 13 August 2024). |
Created by | Aleksas Narščius, 2016-09-02 |
Last update by | Sandra Gečaitė, 2024-08-13 |