Journal article
Extraordinarily high earthworm abundance in deposits of marine macrodetritus along two semi-arid beaches
Marine ecology. Progress series (Halstenbek), Vol.361, pp.181-189
2008
Abstract
Earthworms are common in most soil profiles; however, the abundance of earthworms varies greatly among habitats. The euryhaline earthworm Pontodrilus litoralis was recorded in extraordinarily high numbers in wrack material deposited on and beaches along the western Australian coastline. Based on worm abundance in 20 x 20 x 20 cm plots, we estimated worm densities to be as high as 4875 m(-2) at one site. Mean (SE) worm density was 3200 466 m(-2) for the north Leeman site, with a minimum density of 750 m(-2) at the Point Louise site (1940 475 m(-2)). Using estimates of consumption by earthworms from previous research, we calculated that earthworms could consume approximately 19 kg m(-2) yr(-1) of wrack material deposited at Point Louise and 31 kg m(-2) yr(-1) at north Leeman. The densities and associated potential consumption rates of worms recorded in the wrack habitat well exceed any records of worm populations in other natural systems, The only similar estimates are those from artificially created habitats, such as manure heaps. Stable isotope analyses suggest that the earthworms (mean delta C-13 -15.9 and delta N-15 6.9) were consuming the more ephemeral algal component (mean delta C-13 -21.5 and delta N-15 3.7) of the wrack in preference to the more persistent seagrass material (mean delta C-13 - 12.4 and delta N-15 2.1). The extraordinary densities of earthworms in wrack habitat have implications for the rate of wrack turnover along beach habitats and incorporation of marine-derived nutrients into what is essentially a nutrient-poor terrestrial coastal system. High earthworm densities in the wrack also indicate that wrack as a habitat is a potential hotspot for diversity and metabolism, probably exceeding records for other more stereotypically rich habitats, such as rainforests.
Details
- Title
- Extraordinarily high earthworm abundance in deposits of marine macrodetritus along two semi-arid beaches
- Authors/Creators
- Grey T. Coupland - Univ Western Australia, Fac Nat & Agr Sci, Sch Plant Biol M090, Crawley, WA 6009, AustraliaJustin I. McDonald - Univ Western Australia, Fac Nat & Agr Sci, Sch Plant Biol M090, Crawley, WA 6009, Australia
- Publication Details
- Marine ecology. Progress series (Halstenbek), Vol.361, pp.181-189
- Publisher
- Inter-Research
- Identifiers
- 991005575769107891
- Copyright
- © 2008 Inter-Research.
- Murdoch Affiliation
- Centre for Biosecurity and One Health
- Language
- English
- Resource Type
- Journal article
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- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.45 Soil Science
- 3.45.1113 Soil Fauna Dynamics
- Web Of Science research areas
- Ecology
- Marine & Freshwater Biology
- Oceanography
- ESI research areas
- Environment/Ecology