Spatial Distribution of Bursatella leachii

January 23, 1999
From: Ment Nguyen

Hi Dr. (:
I'm studying about the spatial distribution of sea slugs. From the gathered information about the distribution of the slugs within a ten-meter square plot over a ten-day period, the sea slugs tend to be close together (approx. 8 cm apart) around midnight. As it approaches the afternoon, the distance increases to approx. 350 cm apart between these sea slugs, and as the day draws to an end, the sea slugs become close again. I have a few ideas : the amount of oxygen in the water during certain periods of the day when there is only respiration or respiration/photosynthesis occurring, the temperature and its effect on oxygen levels in the water, and perhaps competition for food? I'm not exactly sure, and your input would be greatly appreciated. Thanks so much!
Ment Nguyen

Mentoz@geocities.com

Nguyen, M., 1999 (Jan 23) Spatial Distribution of Bursatella leachii. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/506

Dear Ment,
I thought I recognised the question! Have a look at my answer to Leah Wiesenfeld's message in July 1998. She asked the same question. Is this a class exercise? If so, have you got a reference to a publication where this research was described?

The problem is there is not enough information to make any suggestions. Were the slugs in an enclosed pool or in the open sea? When the slugs in the 10m square quadrat change from being 8cm apart to 350cm apart where do all the slugs that no longer fit in the 10m square go? Are the researchers suggesting the slugs aggregate close together at night then spread out during the day? More importantly in a study like this I don't think one 10m square quadrat is enough. Were there other quadrats that also showed this phenomenon or what?
I think you should ask your teacher for more information.
Best wishes,
Bill Rudman.

Rudman, W.B., 1999 (Jan 23). Comment on Spatial Distribution of Bursatella leachii by Ment Nguyen. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/506

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