|Researched by||Dr Harvey Tyler-Walters||Refereed by||Dr Matt Bentley|
|Other common names||-||Synonyms||-|
Arenicola marina is the familiar lugworm, much prized as bait by anglers. This sedentary polychaete has a firm, cylindrical body divided into a thoracic and an abdominal region. The head is small, with no appendages or eyes although a rough proboscis may be visible. The thoracic region consists of 19 parapodia bearing segments (with chaetae), of which the last 13 bear bushy gills. The abdominal region is narrower and consists of many segments lacking chaetae and gills. Apart from the head, each segment is divided by 5 rings (annuli). Adults reach between 12 and 20 cm in length and vary in colour from pink to dark pink, red, green, dark brown or black. Digs a U or J-shaped burrow (20-40 cm deep) with characteristic depressions at the head end (the 'blow hole') and a cast of defaecated sediment at the tail end. Feeds on detritus and micro-organisms in ingested sediment. The cast is large and often the colour of clean sand. Tolerates salinities down to 12 psu. Preyed on by flatfish and wading birds, which may 'nip' off the tail as it deposits casts. May be confused with Arenicola defodiens (the black lug) which is generally darker (usually black), longer (up to 270mm), burrows deeper (usually 40-70cm), rarely forms a 'blow hole', produces a finer, neater cast, prefers more exposed coasts rather than estuaries and differs in the number of annuli between the first 4 pairs of chaetae bearing segments and in the shape of the gills.
Arenicola defodiens sp. nov. has recently been distinguished from Arenicola marina on the basis of the morphology of the gills, the annulation pattern between the first 4 chaetigerous segments, size, burrow depth, cast type and shape, colour, absence of a feeding depression and genetic polymorphism (see Cadman & Nelson-Smith, 1993). These two species may represent the 'laminarian' and 'littoral' forms respectively referred to by earlier authors.
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|Phylum||Annelida||Segmented worms e.g. ragworms, tubeworms, fanworms and spoon worms|
|Class||Polychaeta||Bristleworms, e.g. ragworms, scaleworms, paddleworms, fanworms, tubeworms and spoon worms|
|Typical abundance||Moderate density|
|Male size range||120-200mm|
|Male size at maturity|
|Female size range||Medium(11-20 cm)|
|Female size at maturity|
|Growth form||Vermiform segmented|
|Growth rate||See additional text|
|Body flexibility||High (greater than 45 degrees)|
|Characteristic feeding method||Sub-surface deposit feeder, Surface deposit feeder|
|Typically feeds on||Micro-organisms (bacteria), benthic diatoms, meiofauna, and detritus.|
Distomid cercariae and Coccidia.
|Is the species harmful?||No|
|Physiographic preferences||Strait / sound, Sea loch / Sea lough, Ria / Voe, Estuary, Isolated saline water (Lagoon), Enclosed coast / Embayment|
|Biological zone preferences||Lower eulittoral, Mid eulittoral, Sublittoral fringe, Upper eulittoral|
|Substratum / habitat preferences||Fine clean sand, Mixed, Muddy gravel, Muddy sand, Saltmarsh, Sandy mud|
|Tidal strength preferences||Moderately Strong 1 to 3 knots (0.5-1.5 m/sec.), Strong 3 to 6 knots (1.5-3 m/sec.), Very Strong > 6 knots (>3 m/sec.), Very Weak (negligible), Weak < 1 knot (<0.5 m/sec.)|
|Wave exposure preferences||Moderately exposed, Sheltered, Very sheltered|
|Salinity preferences||Full (30-40 psu), Reduced (18-30 psu), Variable (18-40 psu)|
|Other preferences||No text entered|
|Migration Pattern||Non-migratory / resident|
|Reproductive type||Gonochoristic (dioecious)|
|Reproductive frequency||Annual episodic|
|Fecundity (number of eggs)||100,000-1,000,000|
|Generation time||1-2 years|
|Age at maturity||1-2 years (see additional text)|
|Season||See additional text|
|Life span||5-10 years|
|Duration of larval stage||Not relevant|
|Larval dispersal potential||1 km -10 km|
|Larval settlement period||Not relevant|
This MarLIN sensitivity assessment has been superseded by the MarESA approach to sensitivity assessment. MarLIN assessments used an approach that has now been modified to reflect the most recent conservation imperatives and terminology and are due to be updated by 2016/17.
|Removal of the substratum would remove the Arenicola marina population. McLusky et al. (1983) examined the effects of bait digging on blow lug populations in the Forth estuary. Dug and infilled areas and unfilled basins left after digging re-populated within 1 month, whereas mounds of dug sediment took longer and showed a reduced population. Basins accumulated fine sediment and organic matter and showed increased population levels for about 2-3 months after digging. Overall recovery is generally regarded as rapid. However, Fowler (1999) pointed out that recovery may take longer on a small pocket beach with limited possibility of recolonization from surrounding areas. Therefore, if all the available substratum occupied by this species is removed, recovery may be protracted and a rank of high has been given. However, where the affected population is isolated or severely reduced (e.g. by long-term mechanical dredging), then recovery may be extended.|
|Tolerant||Not relevant||Not sensitive||Not relevant|
|Arenicola marina is a sub-surface deposit feeder that technically derives the sediment it ingests from the surface. It rapidly reworks and mixes sediment. It is unlikely to be perturbed by smothering by 5cm of sediment. However, it is likely to be intolerant of smothering by impermeable materials.|
|Low||Immediate||Not sensitive||Very low|
|Arenicola marina is unlikely to be perturbed by increased concentrations of suspended sediment since it lives in sediment and is probably adapted to re-suspension of sediment by wave action or during storms. Increased siltation by fine materials, however, may modify the nature of the substratum and render it unsuitable for the Arenicola marina. Decreases in siltation, however may result in reduced food supply for the blow lug which is partly dependant on organic particles and detritus collected on the sediment surface for food. Therefore a rank of low intolerance has been reported.|
|Not relevant||Not relevant||Not relevant||Not relevant|
|Arenicola marina is protected from desiccation because it lives in a deep, water filled burrow. However, early larvae live on mucilaginous tubes on the surface of the substratum on the upper shore and are likely to be more vulnerable to desiccation. Increased desiccation may depress the upper limit of their distribution and potentially increase mortality, however no information on this factor was found.|
|Changes in emergence will probably not affect Arenicola marina directly. However, changes in emergence regime will alter the water retention and content of the sediment. Decreased emergence is likely to increase the extent of the population higher on the shore. Increased emergence, however, will increase the emersion time and hence the risk of hypoxia and anoxia (see deoxygenation). It is likely to result in a depressed upper limit of the species on the shore, especially in juveniles.|
|Changes in water flow rate are unlikely to affect Arenicola marina directly since it lives in a deep burrow. However, water flow rate and other hydrodynamics factors have a significant effect on the distribution of sediments of different grain size on sedimentary shores. Increased water flow deposits coarser sediments whereas reduced water flow rates will deposit finer sediments. Therefore, changes in water flow rate are likely to change the distribution and extent of Arenicola marina populations.|
|Species dwelling in or on the surface of the sediment are likely to be affected by increased temperatures and direct sunlight, however, deeper burrowing species like Arenicola marina are protected from direct effects. Increased temperatures may affect infauna indirectly, by stimulating increased bacterial activity, increased oxygen consumption and therefore depletion of oxygen from the interstitial waters resulting in reduced oxygen levels (hypoxia) or absence of oxygen (anoxia) (see deoxygenation) in the sediment (Hayward, 1994).
Wilde & Berghuis (1979) reported 20% mortality of juveniles reared at 5 °C, negligible at 10 and 15 °C but 50% at 20 °C and 90% at 25 °C. Sommer et al. (1997) examined sub-lethal effects of temperature and suggested a critical upper and lower temperature of 20 °C and 5 °C respectively in North Sea specimens. Above or below these critical temperatures specimens resort to anaerobic respiration. Sommer et al. (1997) noted that specimens could not acclimate to a 4 °C increase above the critical temperature. Therefore, Arenicola marina is probably intolerant of a short term acute change in temperature of 5 °C although it is unlikely to be directly affected due to its infaunal habit.|
Temperature change may adversely affect reproduction. For example, spawning can be inhibited in gravid adults maintained above 15 °C (Bentley & Pacey, 1992; Watson et al., 2000). Temperature change may affect maturation, spawning time and synchronisation of spawning and reproduction in the long-term (Watson et al., 2000). Therefore, temperature change may affect recruitment in the long term and an intolerance of 'intermediate' has been recorded.
|Low||Immediate||Not sensitive||Very low|
|Increased turbidity may reduce benthic diatom productivity and reduce this source of food for Arenicola marina. However, Arenicola marina also feeds on meiofauna, bacteria and organic particulates in the sediment, and is unlikely to be affected significantly.|
|The hydrodynamic regime has a significant effect on the distribution of sediments of different particle sizes and the slope of the shore. Decreases in wave exposure may increase accretion and hence increase the area of intertidal flat available to Arenicola marina. Conversely increased wave exposure may increase erosion, especially at the bottom of the shore, decreasing the extent of the available habitat for this species. The larval nursery areas may be particularly intolerant especially since the larvae inhabit the top few centimetres of the substratum. Similarly, increased wave action will increase sperm dilution and hence fertilization success, with potentially adverse effects on the population in the long term (Watson et al., 2000).|
|Tolerant||Not relevant||Not sensitive||Not relevant|
|Arenicola marina may respond to vibrations from predators or bait diggers by retracting to the bottom of their burrow. Strong vibrations may interfere with feeding. However, it is unlikely to sensitive to noise per se.|
|Tolerant||Not relevant||Not sensitive||Not relevant|
|Arenicola marina lives in a burrow and therefore in permanent darkness. Although it can emerge to migrate to other areas its visual range is probably very limited.|
|Arenicola marina lives in sediment to a depth of 20-40 cm and is therefore protected from most sources of abrasion and physical disturbance caused by surface action. However, it is likely be damaged by any activity (e.g. anchors, dredging) that penetrates the sediment.|
|Displacement from the sediment is likely to expose Arenicola marina to an increased risk of predation. However, once on the substratum surface Arenicola marina is capable of burrowing back into the sediment and passive migration to suitable sediment (see extraction).|
|The xenobiotic ivermectin (used to control parasitic infestations in livestock including sea lice in fish farms), degrades slowly in marine sediments (half life >100 days). Ivermectin was found to produce a 10 day LC50 of 18µg ivermectin /kg of wet sediment in Arenicola marina. Sub-lethal effects were apparent between 5 - 105 µg/kg. Cole et al. (1999) suggested that this indicated a high intolerance. Naphthalene (a poly-aromatic hydrocarbon, PAH) was found to accumulate from the water column rather than sediment, however it was nearly completely lost from Arenicola marina within 24 hrs (Cole et al. 1999). Bryan & Gibbs (1991) reviewed the reported effects on tributyl tin (TBT). They reported that Arenicola cristata larvae were unaffected by 168 hr exposure to 2000 ng TBT/ l seawater and was probably relatively tolerant. However, given this species intolerance to ivermectin an intolerance of high has been reported.|
|Low||Very high||Very Low||Moderate|
|Arenicola marina is presently used routinely as a standard bioassay organism for assessing the toxicity of marine sediments (Bat & Raffaelli, 1998). At high concentrations of Cu, Cd or Zn the blow lug left the sediment (Bat & Raffaelli, 1998). Bryan (1984) suggested that polychaetes are fairly resistant to heavy metals, based on the species studied. Short term toxicity in polychaetes was highest to Hg, Cu and Ag, declined with Al, Cr, Zn and Pb whereas Cd, Ni, Co and Se the least toxic. Exposure to 10 ppm Cd in seawater halted feeding in Arenicola marina although they continued at 1 ppm (Rasmussen et al., 1998). Rasmussen et al., (1998) pointed out that bioturbation by the blow lug increases the rate of uptake of Cd from the water to the sediment, however, where sediments were already contaminated, bioturbation ensured that some fraction of the contaminant would be mobilised to the surface sediment and the environment. Arenicola marina was found to accumulate As, Cd, Sb, Cu, and Cr when exposed to pulverised fuel ash (PFA) in sediments (Jenner & Bowmer, 1990). Jenner & Bowmer (1990) also noted 95% mortality when exposed to 100% PFA for 90 days and 75% exposed to 50% PFA for the same period, however, the above mortality may have been due to the unsuitability of PFA as a substrate rather than the heavy metal contamination.
The following toxicities have been reported in Arenicola marina:|
|Suchanek (1993) reviewed the effects of oil spills on marine invertebrates and concluded that, in general, on soft sediment habitats, infaunal polychaetes, bivalves and amphipods were particularly affected. Hailey (1995) cited substantial kills of Nereis, Cerastoderma, Macoma, Arenicola and Hydrobia as a result of the Sivand oil spill in the Humber estuary in 1983. Levell (1976) examined the effects of experimental spills of crude oil and oil: dispersant (BP1100X) mixtures on Arenicola marina. Single spills caused 25-50% reduction in abundance and additional reduction in feeding activity. Up to 4 repeated spillages (over a 10 month period) resulted in complete eradication of the affected population either due to death or migration out of the sediment. Levell (1976) noted that recolonization was inhibited but not prevented. Prouse & Gordon (1976) examined the effects of surface fuel oil contamination and fuel oil : sediment mixtures on the blow lug in the laboratory. They found that blow lug was driven out of the sediment by waterborne concentration of >1 mg/l or sediment concentration of >100 µg/g. Worms forced out of sediment may be able to migrate out of affected area but will be exposed to severe predation risk, especially in daylight. Seawater oil concentrations of 0.7 mg oil /l reduced feeding after 5hrs and all worms exposed for 22hrs to 5mg/l oil left the sediment and died after 3 days. However, their sample size, in this experiment, was very small (6 worms). Sediment concentration >10µg/g could reduce feeding activity. Therefore, an intolerance of intermediate has been reported. Arenicola marina can recolonize sediment relatively quickly, within 1 month (see 'Extraction'). However contaminated sediments would probably take longer to recover, so that a recovery of high has been reported.|
|No information||Not relevant||No information||Not relevant|
|Kennedy et al. (1988) reported levels of 137Cs in Arenicola sp. of 220-440 Bq/kg from the Solway Firth. However, there is little evidence on the biological effects of radionuclides on marine species (Cole et al.,1999).|
|The abundance and biomass of Arenicola marina increases with increased organic content in their favoured sediment (Longbottom, 1970; Hayward, 1994). Therefore, moderate nutrient enrichment may be beneficial. However, increasing nutrient enrichment may result in a well studied succession from the typical sediment community, to a community dominated by opportunist species (e.g. capitellids) with increased abundance but reduced species richness and eventually to abiotic anoxic sediments (Pearson & Rosenberg, 1978). Indirect effects may include algal blooms and the growth of algal mats (e.g. of Ulva sp.) on the surface of the intertidal flats. Algal mats smother the sediment, reducing water and oxygen exchange and resulting in localised hypoxia and anoxia when they die. Algal blooms have been implicated in mass mortalites of lugworms, e.g. in South Wales where up to 99% mortality was reported (Holt et al. 1995; Olive & Cadman, 1990; Boalch, 1979). Feeding lug worm were present, and exploitable by bait diggers within 1 month, suggesting rapid recovery, probably by migration from surrounding areas or juvenile nurseries. However, Cryer et al. (1987) reported no recovery for 6 months over summer after mortalities due to bait digging.|
|Once the salinity of the overlying water drops blow about 55% seawater (about 18psu) Arenicola marina stops irrigation, and compresses itself at the bottom of its burrow. It raises its tails to the head of the burrow to 'test' the water at intervals, about once an hour. Once normal salinities return they resume usual activity (Shumway & Davenport, 1977; Rankin & Davenport,1981; Zebe & Schiedek, 1996). This behaviour, together with their burrow habitat, enabled the lugworm to maintain its coelomic fluid and tissue constituents at a constant level, whereas individuals exposed to fluctuating salinities outside their burrow did not (Shumway & Davenport, 1977). Environmental fluctuations in salinity are only likely to affect the surface of the sediment, and not deeper organisms, since the interstital or burrow water is little affected. However, lugworms may be affected by low salinities at low tide after heavy rains. Arenicola marina was able to osmoregulate intracellular and extracellular volume within 72 - 114 hrs by increased urine production and increased amino acid concentration in response to hypo-osmotic shock (low salinity) (see Zebe & Schiedek, 1996). Arenicola marina exposed to hyper-osmotic shock (47 psu) loose weight, but are able to regulate and gain weight within 7-10 days (Zebe & Schiedek, 1996). However, Arenicola marina is unable to tolerate salinities below 24 psu and is excluded from areas influenced by freshwater runoff or input (e.g. the head end of estuaries) where it is replaced by Hediste diversicolor (Hayward, 1994). |
Arenicola marina in the Baltic are more tolerant of reduced salinity. For example, Barnes (1994) reports that Arenicola marina occurs at salinities down to 18 psu in Britain, but survives as low as 8 psu in the Baltic, whereas Shumway & Davenport (1977) reported that this species cannot survive less than 10 psu in the Baltic. The reported salinity tolerance in the Baltic is probably a local adaptation.
|Arenicola marina is subject to reduced oxygen concentrations regularly at low tide and is capable of anaerobic respiration. Transition from aerobic to anaerobic metabolism takes several hours and is complete within 6-8 hrs, although this is likely to be the longest period of exposure at low tide. Fully aerobic metabolism is restored within 60 min once oxygen is returns (Zeber & Schiedek, 1996). This species was able to survive anoxia for 90 hrs in the presence of 10 mmol/l sulphide in laboratory tests (Zeber & Schiedek, 1996). Hydrogen sulphide (H2S) produced by chemoautotrophs within the surrounding anoxic sediment and may, therefore, be present in Arenicola marina burrows. Although the population density of Arenicola marina decreases with increasing H2S, Arenicola marina is able to detoxify H2S in the presence of oxygen and maintain low internal concentration of H2S. At high concentrations of H2S in the lab (0.5, 0.76 and 1.26 mmol/l) the lugworm resorts to anaerobic metabolism (Zeber & Schiedek, 1996). At 16 °C Arenicola marina survived 72 hrs of anoxia but only 36 hrs at 20 °C. Tolerance of anoxia was also seasonal, and in winter anoxia tolerance was reduced at temperatures above 7 °C. Juveniles have a lower tolerance of anoxia but are capable of anaerobic metabolism (Zebe & Schiedek, 1996). However, Arenicola marina has been found to be unaffected by short periods of anoxia and to survive for 9 days without oxygen (Borden, 1931 and Hecht, 1932 cited in Dales, 1958; Hayward, 1994). Therefore, this species is likely to have a low intolerance if exposed to oxygen concentration as low as 2mg/l.|
|No information||Not relevant||No information||Not relevant|
|Ashworth (1904) recorded the presence of distomid cercariae and Coccidia in Arenicola marina from the Lancashire coast. However, no information concerning infestation or disease related mortalities was found.|
|No information||Not relevant||No information||Not relevant|
|No non-native species likely to compete with Arenicola marina were found.|
|Fowler (1999) reviewed the effects of bait digging on intertidal fauna, including Arenicola marina. Diggers have been reported to remove 50 or 70% of the blow lug population. Heavy commercial exploitation in Budle Bay in winter 1984 removed 4 million worms in 6 weeks, reducing the population from 40 to <1 per m². Recovery occurred within a few months by recolonization from surrounding sediment (Fowler, 1999). However, Cryer et al. (1987) reported no recovery for 6 months over summer after mortalities due to bait digging. Mechanical lugworm dredgers have been used in the Dutch Wadden Sea where they removed 17-20 million lugworm/year. However, when combined with hand digging the harvest represented only 0.75% of the estimated population in the area. A near doubling of the lugworm mortality in dredged areas was reported, resulting in a gradual substantial decline in the local population over a 4 year period. The effects of mechanical lugworm dredging is more severe and can result in the complete removal of Arenicola marina (Beukema, 1995; Fowler, 1999). Beukema (1995) noted that the lugworm stock recovered slowly reaching its original level in at least three years. McLusky et al. (1983) examined the effects of bait digging on blow lug populations in the Forth estuary. Dug and infilled areas and unfilled basins left after digging re-populated within 1 month, whereas mounds of dug sediment took showed a reduced population. Basins accumulated fine sediment and organic matter and showed increased population levels for about 2-3 months after digging. Overall recovery is generally regarded as rapid. However, Fowler (1999) pointed out that recovery may take longer on a small pocket beach with limited possibility of recolonization from surrounding areas. Therefore, if adjacent populations are available recovery will be rapid and a rank of 'very high' has been given. However where the affected population is isolated or severely reduced (e.g. by long-term mechanical dredging), then recovery may be extended.|
|Mechanical dredging for shellfish such as cockles (Cerastoderma edule) probably damages or kills Arenicola marina where they co-occur. However, no direct evidence was found. Mechanical harvesting of shellfish and bait in the intertidal is likely to have indirect effects by causing pits or trenches in the sediment. (Moore, 1991; Gubbay & Knapman, 1999). These can potentially form channels that increase local erosion of the sediment and hence loss of intertidal habitat for Arenicola marina.|
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|National (GB) importance||-||Global red list (IUCN) category||-|
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Last Updated: 17/04/2008