Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

Growth and Regeneration Rates in Thinly Encrusting Demospongiae from Temperate Waters

Avril L. Ayling
Biological Bulletin
Vol. 165, No. 2 (Oct., 1983), pp. 343-352
DOI: 10.2307/1541200
Stable URL: http://www.jstor.org/stable/1541200
Page Count: 10
  • Subscribe ($19.50)
  • Cite this Item
Growth and Regeneration Rates in Thinly Encrusting Demospongiae from Temperate Waters
Preview not available

Abstract

Thinly encrusting species of subtidal sponge grow at slow but measurable rates over natural surfaces by lateral spreading. Of the eleven species studied here, Aplysilla rosea had the highest undisturbed rate of growth and Microciona sp. the lowest with an overall negative change in size. Using the mean growth rate it can be estimated that the largest sponge patches observed in the field may be over seventy years old. Growth rates of individual patches were varied but this variation was not synchronous within a species nor did it show any regular temporal pattern. Similarly, no relation between the normal thickness of the species, the wet weight, or true organic content of the species with undisturbed rates of growth could be found. However, the mean patch size of the species was correlated with the undisturbed growth rates. If the tissues of the sponges were damaged, rapid regeneration was initiated at rates many times greater than the undisturbed growth rate of the species. It was also found that even very small sponge patches could recover after almost all living tissue was scraped from the rock.

Page Thumbnails

  • Thumbnail: Page 
343
    343
  • Thumbnail: Page 
344
    344
  • Thumbnail: Page 
345
    345
  • Thumbnail: Page 
346
    346
  • Thumbnail: Page 
347
    347
  • Thumbnail: Page 
348
    348
  • Thumbnail: Page 
349
    349
  • Thumbnail: Page 
350
    350
  • Thumbnail: Page 
351
    351
  • Thumbnail: Page 
352
    352