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Algae count event

Phycology Section: ecology and taxonomy of freshwater algae, particularly diatoms

 


Diatom Count Report
 
C O U N T E V E N T

NEON00297 DT1 A, official count
 
count method: 600 Valves (300 Cells)
slide: NEON00297 DT1 A
    from subsample: NEON00297 DT1
        from sample: NEON00297
 
View results for COUNT EVENT MEASURED ATTRIBUTE(S): 1

   valves (cema_id: 202817 ma_id: 2)

count_event_id: 66721
taxonomy: ANSP-2011
person: Marco Cantonati ... person_id=796
 
started_on: 11/14/2016 12:00:00 AM
estimated_hours: 3.000000000
microscope_optivar_lens_id: 87
source_table: dtm
institution_address_id: 1
 
added on: 4/24/2017 5:33:00 PM, added by: pboylan
modified on: 4/24/2017 5:33:00 PM, modified by: pboylan
 
1 QUALIFIER:

  Qualifier Code: TaxaNote
  Description: Notes taken about the taxa for a count; older data typically includes information such as beginning and end scan coordinates, unusual taxa, etc.
  Comments: Counting transect along median line of coverslip. Counting discrete, successive, non overlapping fields of view along the transect. Going down (as seen under the microscope). start x=97.6, y=20.2; end=97,6, y=12.2 Observed species (= seen while qualitatively scanning the slide but not encountered during the 600 valves count): Cymbella tumida Navicula parablis Observations on individual taxa: - In the counts I kept separated dwarf forms of Achnanthidium exiguum var. constrictum. These differ by small size, subrostrate ends, and extremely weak constriction, and might represent a separate taxon. In this count: Achnanthidium exiguum var. constrictum = 19 valves Achnanthidium exiguum var. constrictum DWARF = 3 - There is a preponderance of small specimens of Achnanthidium jackii but even the smallest R valves consistently have a butterfly-shaped central area (acutely-angled fascia). This species is more easily recognizable in other slides of the same series (e.g., NEON00336). - Gomphosphenia sp. 1 NEON Puerto Rico is a distinct new species that wil be described soon (a draft of the MS is in preparation, plates already exist). Nomenclatural updates (with respect to the ANSP 2011 list): Cocconeis placentula var. euglypta, nowadays generally referred to as Cocconeis euglypta Ehrenberg (see Romero & Jahn 2013). Gomphonema parvulum: This is a species complex. Denticula kuetzingii. This was shown by Tujii & Williams (2006) to be a Nitzschia: Nitzschia denticula. Nitzschia sinuata var. delognei is nowadays usually referred to as Nitzschia solgensis.
 

 


 
Counts version 3.2 - last revision 6/17/2017
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