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Bacillaria paxillifer

(No common name)

Conservation Status

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Population Analysis

  • For the 6,696 species in the Class Bacillariophyceae, we average 23.58 observations each in our database; for Bacillaria paxillifer, we have 1,285 observations. Compared to other species in this Class, this species is moderately common.
  • A two-sample t-test can be used to determine whether the trend in observations of Bacillaria paxillifer is the same as the trend in observations of Bacillariophyceae. Is this species just as common, as a proportion of all observations, as it once was? The answer is no, changes in observation rate of this species significantly differ from changes in observation rate of its Class. (t=27.221, p<0.001)
  • How do observation rates of Bacillaria paxillifer differ from those of Bacillariophyceae? To answer this, we examined the percentage of observerations for Bacillariophyceae that were observations of Bacillaria paxillifer each year. We then correlated this percentage with observation year. If observations of Bacillaria paxillifer are becoming more common relative to other species of Bacillariophyceae, the correlation should be positive, but if it is becoming less common, the correlation should be negative. In fact, the correlation is negative (r=-.65), with a negative slope (m = -.235), suggesting that Bacillaria paxillifer may be in decline relative to other species of Bacillariophyceae. This correlation is statistically significant. (F = 27.91, p<.05)
  • The scatter chart to the right shows the percentage of all observations for Bacillariophyceae each year that were observations of Bacillaria paxillifer.

Taxonomy

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  • Domain: Eukaryota Whittaker & Margulis,1978 - eukaryotes
    • Kingdom: Chromista T. Cavalier-Smith, 1981 - Chromists
      • Subkingdom: Chromobiota Cavalier-Smith, 1991
        • Infrakingdom: Heterokonta (Cavalier-Smith, 1986) Cavalier-Smith, 1995 - Heterokonts

Unambiguous Synonyms:

  1. Bacillaria paradoxa J.F. Gmelin
  2. Nitzschia paradoxa (J.F. Gmelin) Grunow
  3. Nitzschia paxillifer (O.F. Müller) Heiberg
  4. Vibrio paxillifer O.F. Müller

Notes:

Name Status: Accepted Name. Latest taxonomic scrutiny: Guiry M.D..

Physical Description

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Distribution

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Similar Species

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Members of the genus Bacillaria:

There are approximately 9 species and subspecies in this genus: B. cistula · B. cursoria · B. paxillifer · B. paxillifera · B. seriata · B. sociale · B. tabellaris · B. viridis · B. vulgaris

More Info

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Notes

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Contributors:

Data Sources:

Accessed through GBIF Data Portal May 14, 2008:

  • Institute of Marine and Coastal Sciences, Rutgers University: Bay of Fundy Species List (OBIS Canada)
  • Institute of Marine and Coastal Sciences, Rutgers University: Continuous Plankton Recorder database
  • Institute of Marine and Coastal Sciences, Rutgers University: MICROBIS database (CoML)
  • Institute of Marine and Coastal Sciences, Rutgers University: NODC WOD01 Plankton Database
  • Institute of Marine and Coastal Sciences, Rutgers University: Taxonomic Information Sytem for the Belgian coastal area
  • International Census of Marine Microbes: MICROBIS database
  • National Chemical Laboratory: IndOBIS, Indian Ocean Node of OBIS
  • NLBIF: Limnodata

Identifiers:

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Last Revised: May 29, 2008