NR  Vol.5 No.10 , July 2014
How many donor colonies should be cross-fertilized for nursery farming of sexually propagated corals?
ABSTRACT
Coral reef restoration approaches have often utilized adult colonies as sources for fragments (i.e. clones) to be transplanted. Although restoration through this method is fast and cheap, it has been pointed out that it may reduce genetic diversity of the restored population. Low genetic diversity is a concern for reef restoration when seed fragments are raised asexually from only a few donor colonies. This can lead to lower fertilization rates among seed fragments, and reducing the longterm benefits of reef restoration in particular areas. Additionally, low genetic diversity can compound the effects of increased ocean temperature and other environmental stressors, further jeopardizing the health of a reef. An alternative approach through sexually propagated coral cultures and out-plantings can alleviate this problem. Sexually produced offsprings are more genetically diverse. They can be produced in far greater numbers than coral fragments and do not imply destructive methods. Ongoing research at the Akajima Marine Science Laboratory in Okinawa, Japan has helped to improve the production and maintenance of sexually propagated larval cultures. Our results show that crosses between gametes from 6 or more colonies will provide the highest fertilization rate (>95%). Based on the results, we suggest the use of 6 or more donor colonies for practical gamete fertilization in sexually derived coral culture.

Cite this paper
Iwao, K. , Wada, N. , Ohdera, A. and Omori, M. (2014) How many donor colonies should be cross-fertilized for nursery farming of sexually propagated corals?. Natural Resources, 5, 521-526. doi: 10.4236/nr.2014.510047.
References
[1]   Rinkevich, B. (2005) Conservation of Coral Reefs through Active Restoration Measures: Recent Approaches and Last Decade Progress. Environmental Science and Technology, 39, 4333-4342.
http://dx.doi.org/10.1021/es0482583

[2]   Heyward, A.J. and Babcock, R.C. (1986) Selfand Cross-Fertilization in Scleractinian Corals. Marine Biology, 90, 191-195.
http://dx.doi.org/10.1007/BF00569127

[3]   Willis, B., Babcock, R.C., Harrison, P.L. and Wallace, C.C. (1977) Experimental Hybridization and Breeding Incompatibilities within the Mating Systems of Mass Spawning Reef Corals. Coral Reefs, 16, S53-S65.
http://dx.doi.org/10.1007/s003380050242

[4]   Isomura, N., Baba, Y., Nagata, S., Nonaka, M. and Yamamoto, H.H. (2013) The Relationship between Genetic Similarity and Reproductive Success in the Branching Coral Acropora intermedia. Marine Biology Research, 9, 181-188.
http://dx.doi.org/10.1080/17451000.2012.707321

[5]   Baums, I.B. (2008) A Synopsis of Coral Restoration Genetics. In: Leewis, R.J. and Janse, M., Eds., Advances in Coral Husbandry in Public Aquariums. Public Aquarium Husbandry Series 2, Burgers’ Zoo, Arnhem, 335-338.

[6]   Hatta, M., Iwao, K., Taniguchi, H. and Omori, M. (2004) Seed Production. In: Omori, M. and Fujiwara, S., Eds., Manual for Restoration and Remediation of Coral Reefs, Nature Conservation Bureau, Ministry of the Environment, Tokyo, 14-28.

[7]   Guest, J.A., Heyward, A., Omori, M., Iwao, I., Morse, A. and Boch, C. (2010) Rearing Coral Larvae for Reef Rehabilitation. In: Edwards, A.J., Ed., Reef Rehabilitation Manual, Coral Reef Targeted Research & Capacity Building for Management Program, St. Lucia, 73-92.

[8]   Shearer, T.L., Porto, I. and Zubillaga, A.I. (2009) Restoration of Coral Populations in Light of Genetic Diversity Estimates. Coral Reefs, 28, 727-733.
http://dx.doi.org/10.1007/s00338-009-0520-x

[9]   Iwao, K., Omori, M., Taniguchi, H. and Tamura, M. (2010) Transplanted Acropora tenuis (Dana) Spawned First in Their Life 4 Years after Culture from Eggs. Galaxea, Journal of Coral Reef Studies, 12, 47.
http://dx.doi.org/10.3755/galaxea.12.47

[10]   Iwao, K. (2013) Reproduction of Outplanted Corals at Akajima Island. Midoriishi, 24, 24-25. (in Japanese)

 
 
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