Startseite Effects of density and substrate type on recruitment and growth of Pyropia torta (Rhodophyta) gametophytes
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Effects of density and substrate type on recruitment and growth of Pyropia torta (Rhodophyta) gametophytes

  • Jan M. Conitz EMAIL logo , Robert Fagen und Michael S. Stekoll
Veröffentlicht/Copyright: 29. Oktober 2013

Abstract

Does density affect recruitment and growth in the annual, blade phase of Pyropia sp., does self-thinning occur, and does substrate affect recruitment? These questions were investigated in laboratory-cultured Pyropia torta, a naturally occurring species in Alaska with mariculture potential. Three density levels were produced from conchospores. Measurements were made, initially at settlement and germination and, subsequently, at approximately 3-week intervals, in 12 randomly selected cultures from each density level. Settled spores, germlings, or growing blades were counted microscopically and standardized to unit area. Blade surface area was measured microscopically using image analysis software. Three density levels were still distinct at germination, but the high and medium levels were not significantly different. The germination rate of conchospores was highest at the medium density level, suggesting facilitation at moderate densities but inhibition at higher densities. Significant self-thinning occurred at each density level but differed among levels, while overall blade growth was about 10-fold greater at low density than at the other two levels. In a separate experiment, counts of attached spores per unit area on artificial substrate materials were greatest on materials with interstitial spaces large enough to trap spores until they become firmly attached.


Corresponding author: Jan M. Conitz, Juneau Center, School of Fisheries and Ocean Sciences, University of Alaska Fairbanks, 17101 Point Lena Loop Road, Juneau, AK 99801, USA, e-mail:

This research was supported, in part, by a Saltonstall-Kennedy funding (NA76FD0035) administered through NOAA, U.S. Department of Commerce. We thank S. Lindstrom for assistance with this research, including algal identification. We also thank C. Good and S. Hall for their assistance in the laboratory. Finally, we would like to express appreciation for the editorial review and helpful comments from two anonymous reviewers which greatly improved this manuscript.

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Received: 2013-7-9
Accepted: 2013-9-23
Published Online: 2013-10-29
Published in Print: 2013-12-01

©2013 by Walter de Gruyter Berlin Boston

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