Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    On auxospore formation inCaloneis and the nature ofAmphiraphia (Bacillariophyta) (1989)
    Springer
    Plant systematics and evolution 163 (1989), S. 43-52 
    Details
    ISSN: 1615-6110
    Keywords: Diatoms ; Amphiraphia ; Amphiraphidales ; Caloneis ; Auxospore formation ; initial cell structure ; perizonium structure ; sexual reproduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Amphiraphia Chen & Zhu, together with theAmphiraphiaceae andAmphiraphidales, should be abandoned, sinceAmphiraphia cells are the heterovalvar initial cells ofCaloneis. WhenCaloneis reproduces sexually two cells pair and become surrounded by a two-layered capsule of mucilage. Each cell produces two gametes and these become rearranged within the gametangial frustule before plasmogamy. The gametes are amoeboid and fusion is isogamous. Following plasmogamy the zygote contracts, becomes ellipsoidal, and lays down a primary perizonial band. This is a complete, wide hoop, while subsequent perizonial bands are narrow and open.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00936152
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The species concept in diatoms: Evidence for morphologically distinct, sympatric gamodemes in four epipelic species (1989)
    Springer
    Plant systematics and evolution 164 (1989), S. 215-237 
    Details
    ISSN: 1615-6110
    Keywords: Diatoms ; Caloneis ; Cymatopleura ; Neidium ; Sellaphora ; Infraspecific variation ; microevolution ; reproductive isolation ; species concepts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Reproductive isolation is demonstrated between morphologically distinct, sympatric demes of four epipelic diatom species inhabiting a small pond. The six demes ofSellaphora pupula, four of them allogamous, one probably autogamous, and one apparently asexual, differ morphologically with respect to size, shape, stria density and pattern. In the pond,Caloneis silicula, Cymatopleura solea, andNeidium ampliatum each contain two allogamous demes, differing principally in size. There are intrinsic barriers to hybridization between the demes, which operate at the earliest stages of sexual reproduction. Such gamodemes are perhaps best treated taxonomically as separate species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00940439
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...