Barke, Judith; van der Burgh, Johan; van Konijnenburg-van Cittert, Johanna H A; Collinson, Margaret E; Pearce, Martin A; Bujak, Jonathan; Heilmann-Clausen, Claus; Speelman, Eveline N; van Kempen, Monique M L; Reichart, Gert-Jan; Lotter, André F; Brinkhuis, Henk (2012): (Table 2) Distinctive microspore massula characteristics of Azolla arctica, Azolla jutlandica, Azolla sp. 1 and Azolla sp. 2 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.787096, In supplement to: Barke, J et al. (2012): Coeval Eocene blooms of the freshwater fern Azolla in and around Arctic and Nordic seas. Palaeogeography, Palaeoclimatology, Palaeoecology, 337-338, 108-119, https://doi.org/10.1016/j.palaeo.2012.04.002
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Project(s):
Coverage:
Latitude: 87.866580 * Longitude: 136.177350
Date/Time Start: 2004-08-27T00:00:00 * Date/Time End: 2004-08-27T00:00:00
Minimum Elevation: -1287.9 m * Maximum Elevation: -1287.9 m
Event(s):
302-M0004A (ACEX-M4A) * Latitude: 87.866580 * Longitude: 136.177350 * Date/Time: 2004-08-27T00:00:00 * Elevation: -1287.9 m * IGSN: IBCR0302RHVS001 * Penetration: 427.9 m * Recovery: 85.91 m * Location: Arctic Ocean * Campaign: Exp302 (Arctic Coring Expedition, ACEX) * Basis: CCGS Captain Molly Kool (Vidar Viking)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Description | Description | Barke, Judith | |||
| 2 | Azolla arctica | A. arctica | Barke, Judith | |||
| 3 | Azolla jutlandica | A. jutlandica | Barke, Judith | |||
| 4 | Azolla sp. | Azolla sp. | Barke, Judith | Azolla sp. 1 | ||
| 5 | Azolla sp. | Azolla sp. | Barke, Judith | Azolla sp. 2 |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
62 data points
Data
| 1 Description | 2 A. arctica | 3 A. jutlandica | 4 Azolla sp. (Azolla sp. 1) | 5 Azolla sp. (Azolla sp. 2) |
|---|---|---|---|---|
| Width of glochidia anchor-tips (A) | 4 - 5 µm | up to 8 µm | 8 - 9 µm | 6 - 7 µm |
| Width of glochidia shafts (B) | 2 - 2.5 µm | 5 - 8 µm | 3 - 4 µm | 3 µm |
| Width of lower part of glochidia stalks (C) | 1 µm | 2 µm | 2 µm | 2 µm |
| Length of glochidia flukes (D) | 2 - 3 µm | 6 µm | 5 µm | up to 5 µm |
| Length of glochidia fluke extensions (E) | 0.5 - 1.5 µm | 1.5 - 2.5 µm | 4 - 6 µm | 2 - 4 µm |
| Total length of glochidia (F) | 22 - 30 µm | 15 - 55 µm | 45 - 85 µm | 30 - 75 µm |
| Total length of glochidia (F) | 45 - 85 µm | |||
| Shape of glochidia anchor-tips | Rounded | Typically broad, flat and blunt ended | Obtusely rounded | Broad and flat to rounded to arrow head-shaped |
| Shape of glochidia fluke tips | Not recurved | Not recurved | Typically recurved | Straight; sometimes recurved |
| Attachment of glochidia stalks to massulae | Stalk width unchanged at attachment area | Stalk width widening slightly | Stalk expanding to wide | Stalk width widening slightly |
| Hairs on lower glochidia stalks (length) | Absent | Sometimes (2-5 µm) | Often (3 - 4) µm | Absent |
| Hairs on massulae (length) | 1 - 2 (3) µm | 2 - 5 µm | 3 - 4 µm | absent |
| Length oflaesurae | 2/3 radius | 1 /3 radius | 1 /2 radius | 1 /2 radius |