Differences in abalone growth and morphology between locations with high and low food availability: morphologically fixed or plastic traits?
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Many species of sedentary marine invertebrates exhibit large spatial variation in their morphology, which allow them to occupy a broad geographic distribution and range of environmental conditions. However, the detection of differences in morphology amongst variable environments cannot determine whether these differences represent a plastic response to the local environment, or whether morphology is genetically fixed. We used a reciprocal transplant experiment to test whether ‘stunted’ blacklip abalone (Haliotis rubra) are the result of a plastic response to the environment or fixed genetic trait. Furthermore, we related environmental factors, that affect food availability (density of abalone, water movement, algal cover and reef topography), to differences in growth and morphology. Morphological plasticity was confirmed as the mechanism causing morphological variation in H. rubra. Individuals transplanted to sites with ‘non-stunted’ H. rubra grew significantly faster when compared to stunted controls, whilst individuals transplanted to stunted sites grew significantly slower compared to non-stunted controls. The growth response was greater for individuals transplanted from ‘non-stunted’ to ‘stunted’ sites, suggesting that the environmental stressors in morphologically ‘stunted’ habitat are stronger compared to locations of faster growing morphology. We propose that these differences are related to resource availability whereby low algal cover and topographic simplicity results in stunted populations, whereas high algal abundance and topographic complexity results in non-stunted populations.
KeywordsShell Length Native Site Plastic Response Shell Height Algal Cover
We would like to thank Associate Professor Andy Davis, Dr. Tim Ward, Erin Sautter and Ian Carlson for commenting on previous drafts of this article. We would also like to thank Andrew Hogg for extensive assistance with field and laboratory work and Neal Chambers, Dan Gorman, Kylie Howard, Alan Jones and David Sturges for assistance with diving. SARDI aquatic sciences provided funds for this research.
- Breen PA, Adkins BE (1982) Observations of abalone populations on the north coast of British Columbia, July 1980. Department of Fisheries and Oceans Resource Services Branch, 1633, Nanaimo, British ColumbiaGoogle Scholar
- Day RW, Fleming AE (1992) The determinants and measurement of abalone growth. In: Shepherd SA, Tegner MJ, Guzman Del Proo SA (eds) Abalone of the world: biology, fisheries and culture. Fishing News Books, Oxford, pp 141–168Google Scholar
- Dixon CD, Day RW (2004) Growth responses in emergent greenlip abalone to density reductions and translocations. J Shellfish Res 23:1223–1228Google Scholar
- Donovan DA, Taylor HH (2008) Metabolic consequences of living in a wave-swept environment: effects of simulated wave forces on oxygen consumption, heart rate, and activity of the shell adductor muscle of the abalone Haliotis iris. J Exp Mar Biol Ecol 354:231–240. doi: https://doi.org/10.1016/j.jembe.2007.11.011 CrossRefGoogle Scholar
- Ebert TA (1996) Adaptive aspects of phenotypic plasticity in echinoderms. Oceanol Acta 19:347–355Google Scholar
- Emmett B, Jamieson GS (1989) An experimental transplant of northern abalone, Haliotis kamtschatkana, in Barkley Sound, British Columbia. Fish Bull (Wash DC) 87:95–104Google Scholar
- Johannesson K, Kautsky N, Tedengren M (1990) Genotypic and phenotypic differences between Baltic and North-sea populations of Mytilus edulis evaluated through reciprocal transplantations 2. Genetic-variation. Mar Ecol Prog Ser 59:211–219. doi: https://doi.org/10.3354/meps059211 CrossRefGoogle Scholar
- Johnson MS, Black R (2000) Associations with habitat versus geographic cohesiveness: size and shape of Bembicium vittatum philippi (Gastropoda: Littorinidae) in the Houtman Abrolhos islands. Biol J Linn Soc Lond 71:563–580. doi: https://doi.org/10.1111/j.1095-8312.2000.tb01275.x CrossRefGoogle Scholar
- Palumbi SR (2003) Population genetics, demographic connectivity, and the design of marine reserves. Ecol Appl 13:S146–S158. doi: https://doi.org/10.1890/1051-0761(2003)013[0146:PGDCAT]2.0.CO;2 CrossRefGoogle Scholar
- Prince JD (2005) Combating the tyranny of scale for haliotids: micro-management for microstocks. Bull Mar Sci 76:557–577Google Scholar
- Saunders T, Mayfield S (2008) Predicting biological variation using a simple morphometric marker in the sedentary marine invertebrate Predicting biological variation using a simple morphometric marker in the sedentary marine invertebrate Haliotis rubra. Mar Ecol Prog Ser 366:75–89. doi: https://doi.org/10.3354/meps07563 CrossRefGoogle Scholar
- Tegner MJ (1992) Brood-stock transplants as an approach to abalone stock enhancement. In: Shepherd SA, Tegner MJ, Guzmán del Próo SA (eds) Abalone of the world: biology, fisheries and culture. Blackwell, Oxford, pp 461–473Google Scholar
- Worthington DG, Andrew NL, Hamer G (1995) Covariation between growth and morphology suggests alternative size limits for the blacklip abalone, Haliotis rubra, in New South Wales, Australia. Fish Bull (Wash DC) 93:551–561Google Scholar