“Whoa! It’s like Spotify but for academic articles.”

Instant Access to Thousands of Journals for just $40/month

Try 2 weeks free now

Sexual Reproduction of the Antarctic Brown Alga Ascoseira mirabilis (Ascoseirales, Phaeophyceae)

Abstract Gametes of the antarctic brown alga Ascoseira mirabilis were studied at King George Island, South Shetland Islands. Mature field plants exuded gametangial masses through the ostioles of their conceptacles in a similar way to other conceptacle-bearing brown algae. Motile isogametes differ from the Ectocarpus-type by their flagellar activity-pattern and lack of eye-spots and phototaxis. Hormosirene, a low-molecular volatile hydrocarbon was obtained from gametes. Zygotes were formed without gamete attraction, and bio-assays showed no response of Ascoseira gametes to synthetic hormosirene. Introduction Ascoseira mirabilis Skottsberg is a large brown alga endemic to the Antarctic Peninsula and neighbouring Islands. Due to its unique morphological and repro* düctive characters it is treated as the only member of the monotypic order Ascoseirales, which has no evident close relationship to other Phaeophyceaen orders (Moe and Henry 1982). The nature of chain-like reproductive structures in the conceptacles of Ascoseira was unknown until Clayton (1987) established that they are gametangiä. She observed sexual fusions between isogametes. Thus, the life history of Ascoseira consists of a succession of diploid sporophytes. Immediately following meiosis aggregates of eight gametophytes are formed within the meiosporangiuin. Each gametophyte consists of a degenerated residual cell and one gamete. A similar http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Botanica Marina de Gruyter

Loading next page...

You’re reading a free preview. Subscribe to read the entire article.

DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy unlimited access and
personalized recommendations from
over 12 million articles from more than
10,000 peer-reviewed journals.

All for just $40/month

Try 2 weeks free now

Explore the DeepDyve Library

How DeepDyve Works

Spend time researching, not time worrying you’re buying articles that might not be useful.

Unlimited reading

Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.

Stay up to date

Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.

Organize your research

It’s easy to organize your research with our built-in tools.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from Springer, Elsevier, Nature, IEEE, Wiley-Blackwell and more.

All the latest content is available, no embargo periods.

See the journals in your area

Simple and Affordable Pricing

14-day free trial. Cancel anytime, with a 30-day money-back guarantee.

Monthly Plan

  • Read unlimited articles
  • Personalized recommendations
  • Print 20 pages per month
  • 20% off on PDF purchases
  • Organize your research
  • Get updates on your journals and topic searches


Best Deal — 25% off

Annual Plan

  • All the features of the Professional Plan, but for 25% off!
  • For the normal price of 10 articles elsewhere, you get one full year of unlimited access to articles.

billed annually