Entanglement in or ingestion of anthropogenic debris in marine and estuarine environments - key threatening process listing

NSW Scientific Committee - final determination

The Scientific Committee, established by the Threatened Species Conservation Act, has made a Final Determination to list the Entanglement in or ingestion of anthropogenic debris in marine and estuarine environments as a KEY THREATENING PROCESS in Schedule 3 of the Act. Listing of key threatening processes is provided for by Part 2 of the Act.

The Scientific Committee has found that:

1. Anthropogenic debris in marine and estuarine environments (usually known as marine debris) is defined as pollution by human-generated objects (Faris and Hart 1996). Marine debris is mostly comprised of fishing gear, packaging materials, convenience items and raw plastics (Pruter 1987). The major sources of marine debris are from ship waste, recreational activities, aquaculture industry and both urban and rural discharges into rivers, estuaries and coastal areas (Faris and Hart 1996, Frost and Cullen 1997, Herfort 1997).

2. There is an increasing quantity of marine debris entering the marine environment every year (Laist 1987, Jones 1995). In particular, the use of plastics in the fishing industry has become more widespread in the last four decades and this has resulted in large quantities of debris entering marine and estuarine environments (Henderson 2001).

3. Marine debris may be transported long distances by oceanic currents and is concentrated at convergence fronts and in coastal waters (Shaw and Mapes 1979, Carr 1987). These marine areas are also highly productive ecosystems that support high densities of marine species and leads to their exposure to marine debris (Carr 1987).

Marine debris is known to entangle and be ingested by marine, estuarine and pelagic vertebrate species. Entanglement and ingestion may occur either accidentally while feeding or scavenging, or deliberately if marine debris is mistaken for prey items (Laist 1987). It can also be regurgitated by adult birds as food for hatchlings (Cooper 1995, Huin and Croxall 1996). Sub-lethal effects of entanglement or ingestion of marine debris may reduce an individual's fitness and ability to successfully reproduce, catch prey and avoid predation (Ryan 1990, Pemberton et al. 1992).

4. Detrimental effects of entanglement with marine debris include strangulation, increased drag, lacerations, infection and loss of limbs. Ingestion of marine debris may lead to the blockage and/or perforation of an individual's digestive system (Prendergast and Johnson 1996), or potentially, poisoning by polychlorinated biphenyls (PCBs). High levels of PCBs can suppress an individual's immunity or reproductive ability (Hutchinson and Simmonds 1992), and amounts of ingested plastic have been positively correlated with levels of PCBs in seabirds (Ryan et al. 1988).

5. Several studies have investigated the impact of marine debris on seals in Australian waters. A study of the New Zealand Fur-seal, Arctocephalus forsteri, population on Kangaroo Island found 0.8% of the population suffers entanglements each year (Page et al. 2003). In Tasmanian waters between 1989 and 1993, 136 Australian Fur-seals, A. pusillus, were observed with plastic neck collars (Pemberton et al. 1992). Observations of juvenile Australian Fur-seals on Montague Island found entanglement around the neck by rope, strap or portions of trawl net on seven occasions (Shaughnessy et al. 2001).

6. Records of injured and dead marine wildlife are kept by NSW National Parks & Wildlife Service (K. Waples, pers. comm.) and Taronga Zoo (L. Hall, pers. comm.). These databases show a wide variety of marine vertebrates are impacted by entanglement in line, the presence of hooks in the mouth or gut, wounds caused by line or net and gastric impaction by plastic bodies. A study of 173 estuaries along the NSW coast found at least 10% of the Australian Pelican, Pelicanus conspicillatus, population to be suffering from entanglement by fishing line (L. Ferris pers. comm.). Overseas studies show that most albatross and giant-petrel species ingest plastic debris and regurgitate it as food for their offspring (Fry et al. 1987, Ryan 1987, Sileo et al. 1990, Huin and Croxall 1996, Robertson 1998).

7. Cases of entanglement with and ingestion of marine debris have been recorded in the following species and populations that are threatened in NSW:

Endangered Species

  • Caretta caretta Loggerhead Turtle
  • Diomedea exulans Wandering Albatross
  • Macronectes giganteus Southern Giant-petrel

Vulnerable Species
  • Chelonia mydas Green Turtle
  • Dermochelys coriacea Leathery Turtle
  • Diomedea gibsoni Gibson's Albatross
  • Diomedea melanophris Black-browed Albatross
  • Arctocephalus pusillus Australian Fur-seal
  • Arctocephalus forsteri New Zealand Fur-seal
  • Megaptera novaeangliae Humpback Whale
  • Physeter catadon Sperm Whale

Endangered Population
  • Little Penguin, Eudyptula minor, population in the Manly Point Area.

8. Entanglements with and ingestion of marine debris are likely to affect the following species that are threatened in NSW:

Endangered Species

  • Sterna albifrons Little Tern
  • Thinornis rubricollis Hooded Plover
  • Dugong dugong Dugong
  • Balaenoptera musculus Blue Whale

Vulnerable Species
  • Charadrius leschenaulti Greater Sand-plover
  • Charadrius mongolus Lesser Sand-plover
  • Diomedea antipodensis Antipodean Albatross
  • Diomedea cauta Shy Albatross
  • Haematopus fuliginosus Sooty Oystercatcher
  • Haematopus longirostris Pied Oystercatcher
  • Limosa limosa Black-tailed Godwit
  • Pandion haliaetus Osprey
  • Phoebetria fusca Sooty Albatross
  • Eubalaena australis Southern Right Whale

9. Entanglement with and ingestion of marine debris could cause the following species or populations that are not threatened to become threatened in NSW:

  • Numenius madagascariensis Eastern Curlew
  • Numenius phaeopus Whimbrel
  • Limosa lapponica Bar-tailed Godwit
  • Puffinus gavia Fluttering Shearwater

10. In view of the above the Scientific Committee is of the opinion that Entanglement in or ingestion of anthropogenic debris in marine and estuarine environments adversely affects two or more threatened species or populations, or could cause species or populations that are not threatened to become threatened.

 

Associate Professor Paul Adam
Chairperson
Scientific Committee

Proposed Gazettal date: 13/2/04
Exhibition period: 13/02/04 - 26/03/04

 

References:

Carr A (1987) Impact of non-degradable marine debris on the ecology and survival outlook of sea turtles. Marine Pollution Bulletin 18, 352-356.

Cooper JM (1995) Fishing hooks associated with albatrosses at Bird Island, South Georgia, 1992/1993. Marine Ornithology 23, 17-21.

Faris J, Hart K (1996) Seas of Debris: A Summary of the Third International Conference on Marine Debris. Miami, Florida, 8-13 May 1994. p54. National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Seattle.

Frost A, Cullen M (1997) Marine debris on northern New South Wales beaches (Australia): Sources and role of beach usage. Marine Pollution Bulletin 34, 348-352.

Fry DM, Fefer SI, Sileo L (1987) Ingestion of plastic debris by Laysan Albatrosses and Wedge-tailed Shearwaters in the Hawaiian Islands. Marine Pollution Bulletin 18, 339-343.

Henderson JR (2001) A pre- and post-MARPOL Annex V summary of Hawaiian monk seal entanglements and marine debris accumulation in the Northwestern Hawaiian Islands, 1982-1988. Marine Pollution Bulletin 42, 584-589.

Herfort A (1997) 'Marine debris on beaches in New South Wales with a special focus on fishing debris'. Ocean Watch Australia, Sydney.

Huin N, Croxall JP (1996) Fishing gear, oil and marine debris associated with seabirds at Bird Island South Georgia 1993/94. Marine Ornithology 24, 19-22.

Hutchinson J, Simmonds M (1992) Escalation of threats to marine turtles, Oryx 26, 95-102.

Jones MM (1995) Fishing debris in the Australian marine environment. Marine Pollution Bulletin 30, 25-33.

Laist DW (1987) Overview of the biological effects of lost and discarded plastic debris in the marine environment. Marine Pollution Bulletin 18, 319-326.

Page B, McKenzie J, McIntosh R, Baylis A, Morissey A, Calvert N, Hasse T, Berris M, Dowie D, Shaughnessy PD, Goldsworthy SD (2003) A summary of Australian sea lion and New Zealand fur seal entanglements in marine debris pre- and post-implementation of Australian Government fishery bycatch policies. The Australian Marine Sciences Association Annual Conference 2003, Brisbane, Queensland, 9 - 11th July 2003.

Pemberton D, Brothers NP, Kirkwood R (1992) Entanglement of Australian Fur Seals in man-made debris in Tasmanian waters. Wildlife Research 19, 151-159.

Prendergast R, Johnson S (1996) Plastic pollution and the Australian fur-seal (Arctocephalus pusillus doriferus): research and public education. In Proceedings of the ARAZPA/ASZK conference, Perth, Western Australia, April 1995. (Ed E. Read) pp. 148-155. (Perth Zoo, Perth)

Pruter AT (1987) Sources, quantities and distribution of persistent plastics in the marine environment. Marine Pollution Bulletin 18, 305-310.

Robertson CJR (1998) Factors influencing breeding performance of the Northern Royal Albatross. In 'The Albatross: Biology and Conservation'. (Eds G Robertson and R Gales) pp. 99-104. (Surrey Beatty and Sons: Chipping Norton, NSW)

Ryan PG (1987) The incidence and characteristics of plastic particles ingested by seabirds. Marine and Environmental Research 23, 175-206.

Ryan PG (1990) The effects of ingested plastic and other marine debris on seabirds. pp. 623-634 In 'Proceedings of the Second International Conference on Marine Debris', (Eds RS Shomura and ML Godfrey), April 2-7, 1989. Honululu, Hawaii. U.S. Department of Commerce, NOAA Technical Memorandum. NMFS, NOAA-TM-NMFS-SWFC-154.

Ryan PG, Connell S, Gardner B (1988) Plastic ingestion and PCBs in seabirds: is there a relationship? Marine Pollution Bulletin 19, 174-176.

Shaughnessy PD, Briggs SV, Constable R (2001) Observations on seals at Montague Island, New South Wales. Australian Mammalogy 23, 1-7.

Shaw DG, Mapes GA (1979) Surface circulation and the distribution of pelagic tar and plastic. Marine Pollution Bulletin 10, 160-162.

Sileo L, Sievert PR and Samuel MD (1990) Causes of mortality of albatross chicks at Midway Atoll. Journal of Wildlife Diseases 26, 329-338.

 

Bibliography:

Derraik JGB (2002) The pollution of the marine environment by plastic debris: a review. Marine Pollution Bulletin 44, 842-852.

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Page last updated: 28 February 2011