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.
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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- Colpomenia bullosa crust (Phaeophyceae) stressed less by grazing than by abiotic factors in high intertidal rockpools in southeast Australia
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Artikel in diesem Heft
- Masthead
- Masthead
- Research articles
- Ecological dynamics of Zostera marina (eelgrass) in three adjacent bays in Atlantic Canada
- Historical and present distribution of Zostera marina in the high north (Troms County, northern Norway) – a decline over the last century
- Tolerance to air exposure: a feature driving the latitudinal distribution of two sibling kelp species
- Colpomenia bullosa crust (Phaeophyceae) stressed less by grazing than by abiotic factors in high intertidal rockpools in southeast Australia
- Assessment of Fucus virsoides distribution in the Gulf of Trieste (Adriatic Sea) and its relation to environmental variables
- Long-term changes in sublittoral macroalgal assemblages related to water quality improvement
- Linking macroalgal δ15N-values to nitrogen sources and effects of nutrient stress on coral condition in an upwelling region
- Non-coralline crustose algae associated with maerl beds in Portugal: a reappraisal of their diversity in the Atlantic Iberian beds
- Hydrolithon abyssophila sp. nov. (Hydrolithoideae, Corallinales), a bisporic coralline from the insular shelf edge of Puerto Rico and the Virgin Islands (US)
- The first record of Grateloupia subpectinata from the New Zealand region and comparison with G. prolifera, a species endemic to the Chatham Islands
- Neosiphonia baliana sp. nov. and N. silvae sp. nov. (Rhodomelaceae, Rhodophyta) from Bali, Indonesia
- Effects of density and substrate type on recruitment and growth of Pyropia torta (Rhodophyta) gametophytes
- Morphology and life stages of the potentially pinnatoxin-producing thecate dinoflagellate Vulcanodinium rugosum from the tropical Mexican Pacific
- Short communication
- Fungal endophytes of the seagrasses Halodule wrightii and Thalassia testudinum in the north-central Gulf of Mexico