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Chamaepinnularia thermophila (Bacillariophyceae): synonymy with Navicula tongatensis Hustedt and update of its geographic distribution and ecology Cover

Chamaepinnularia thermophila (Bacillariophyceae): synonymy with Navicula tongatensis Hustedt and update of its geographic distribution and ecology

Oceanological and Hydrobiological Studies
Volume 48 (2019): Issue 2 (June 2019)
By: Giuseppina Grazia Lai,  Luc Ector,  Bachisio Mario Padedda,  Antonella Lugliè and  Carlos Eduardo Wetzel  
Open Access
|Jun 2019

Figures & Tables

Figure 1

Geographic location and photo of the San Giovanni Su Anzu thermo-mineral spring (Sardinia, Italy)
Geographic location and photo of the San Giovanni Su Anzu thermo-mineral spring (Sardinia, Italy)

Figure 2(a–v)

Fig. 2(a–t). Light microscopy (LM). Chamaepinnularia thermophila from the San Giovanni Su Anzu spring. Fig. 2(u–v). Scanning electron microscopy (SEM). Chamaepinnularia thermophila from the San Giovanni Su Anzu spring. Fig. 2(u–v): external views. Valves showing the straight raphe, with distal ends bent toward the same side, the central silica nodule and striae slightly radiate. Fig. 2v: internal view. Valve showing three large areolae interrupted by the silica deposition along the apical plane
Fig. 2(a–t). Light microscopy (LM). Chamaepinnularia thermophila from the San Giovanni Su Anzu spring. Fig. 2(u–v). Scanning electron microscopy (SEM). Chamaepinnularia thermophila from the San Giovanni Su Anzu spring. Fig. 2(u–v): external views. Valves showing the straight raphe, with distal ends bent toward the same side, the central silica nodule and striae slightly radiate. Fig. 2v: internal view. Valve showing three large areolae interrupted by the silica deposition along the apical plane

Figure 3(a–u)

Fig. 3a: Reproduction of the holotype material illustrated in Hustedt (1962) – Fig. 1345: a, b 2000/1, c, d 1000/1. Fig. 3(b–q): Light microscopy (LM). Navicula tongatensis Hustedt 1962 from his original material. Fig. 3(r–u): Scanning electron microscopy (SEM). Navicula tongatensis Hustedt 1962 from his original material. Fig. 3r: external view. Frustule showing unperforated girdle bands. Fig. 3(s–t): external views. Valves showing the radiate striae composed of three or four areolae and the straight raphe, with distal ends bent toward the same side. Fig. 3u: internal views. Valves showing the areolae interrupted by the silica deposition along the apical plane
Fig. 3a: Reproduction of the holotype material illustrated in Hustedt (1962) – Fig. 1345: a, b 2000/1, c, d 1000/1. Fig. 3(b–q): Light microscopy (LM). Navicula tongatensis Hustedt 1962 from his original material. Fig. 3(r–u): Scanning electron microscopy (SEM). Navicula tongatensis Hustedt 1962 from his original material. Fig. 3r: external view. Frustule showing unperforated girdle bands. Fig. 3(s–t): external views. Valves showing the radiate striae composed of three or four areolae and the straight raphe, with distal ends bent toward the same side. Fig. 3u: internal views. Valves showing the areolae interrupted by the silica deposition along the apical plane

Figure 4

Seasonal abundance of Chamaepinnularia thermophila on the three investigated substrates from the San Giovanni Su Anzu spring (Sardinia, Italy)
Seasonal abundance of Chamaepinnularia thermophila on the three investigated substrates from the San Giovanni Su Anzu spring (Sardinia, Italy)

Figure 5

Species composition based on five most abundant taxa associated with Chamaepinnularia thermophila for each substrate and season. Acronyms of the species: ADMI = Achnanthidium minutissimum (Kützing) Czarnecki; CFEU = Cocconeis feuerbornii Hustedt; CFON = Caloneis fontinalis (Grunow) Cleve-Euler; GOMS = Gomphonema sp.; HLMO = Halamphora montana (Krasske) Levkov; NAMP = Nitzschia amphibia Grunow; NCIN = Navicula cincta (Ehrenberg) Ralfs; NINC = Nitzschia inconspicua Grunow; PROH = Planothidium rostratoholarcticum Lange-Bertalot & Bąk; SNIG = Sellaphora nigri (De Notaris) C.E.Wetzel & Ector; SSGE = Sellaphora saugerresii (Desmazières) C.E.Wetzel & D.G.Mann; UULN = Ulnaria ulna (Nitzsch) Compère
Species composition based on five most abundant taxa associated with Chamaepinnularia thermophila for each substrate and season. Acronyms of the species: ADMI = Achnanthidium minutissimum (Kützing) Czarnecki; CFEU = Cocconeis feuerbornii Hustedt; CFON = Caloneis fontinalis (Grunow) Cleve-Euler; GOMS = Gomphonema sp.; HLMO = Halamphora montana (Krasske) Levkov; NAMP = Nitzschia amphibia Grunow; NCIN = Navicula cincta (Ehrenberg) Ralfs; NINC = Nitzschia inconspicua Grunow; PROH = Planothidium rostratoholarcticum Lange-Bertalot & Bąk; SNIG = Sellaphora nigri (De Notaris) C.E.Wetzel & Ector; SSGE = Sellaphora saugerresii (Desmazières) C.E.Wetzel & D.G.Mann; UULN = Ulnaria ulna (Nitzsch) Compère

Figure 6

Map of Chamaepinnularia thermophila sites in various parts of the world. Brown circles: Quaternary sections; orange circles: thermal waters (springs and well); uncolored circles: unknown type
Map of Chamaepinnularia thermophila sites in various parts of the world. Brown circles: Quaternary sections; orange circles: thermal waters (springs and well); uncolored circles: unknown type

Physical and chemical variables of the sites with Chamaepinnularia thermophila (including the new site of the San Giovanni Su Anzu spring in Sardinia, Italy), relative abundance of the species and occurrence on different substrates

VariablesUnitsCountry
GuadalupeMartiniqueSardinia
Spring sites
Chute du CarbetLa LiseSucrerieSan Giovanni Su Anzu
Temperature°C44.944.926.429.3–30
DischargeIs- 1 0.489–0.651
Mean water depthcm 6–7.3
pH 6.517.337.927.26–7.30
Alkalinitymeq l-1 3.8–4.7
ConductivityμS cm-1 1558570–590
Dissolved Oxygen 7.077.2–8.7
Oxygen saturation% saturation 89.295–114
BOD5mg O2 l-1 1.0–3.3
Cl 36827.5 42.5–46.1
Total hardnessmg CaCO3 l-1 235–235
Reactive phosphorus 16–24
Total phosphorusμg P l-1 37–78
N-NO2-μg N l–1 4–6
N-NO32001140 2448–2932
N-NH4 3–8
Total nitrogen 3743–6244
Reactive silicamg Si l–111072 7.53–8.65
Suspended solidsmg l–1 0–1.8
Br- < D.L.0.4
Ca2+18813.4 44–44
F <D.L.–0.1
Fe2+ 0.04–0.04
HCO3-125132 254.4–274.5
K+243.89 1.7–2.2
Mg2 +64.94.84 30.4–30.9
Mn2 +n.d.0.011 0.04–0.05
Na+116.241.9 26–27.3
SO42 -3035.69 8.0–9.8
% C. thermophila 10–50%< 10%550.9–10.8
Substrate cobcob/mac/sed

Main characteristics and the type locality of Navicula thermophila and Navicula tongatensis reported in the original descriptions of the species

Navicula thermophila Manguin in Bourrelly & Manguin 1952Navicula tongatensis Hustedt 1962
Valve outlineellipticlinear-elliptic
Endscapitatesub-capitate
Raphe straight, filiform
Striaeradiate, more spaced in the middleslightly radiate, more spaced in the middle
Central areasub-quadratic
Length (μm)7.2–8.06.0–8.0
Width (μm)2.5–3.02.5
Striae/10 μm29–3026–28
Type localityhot-salt springthermal well
DOI: https://doi.org/10.1515/ohs-2019-0011 | Journal eISSN: 1897-3191 | Journal ISSN: 1730-413X
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Language: English
Page range: 105 - 115
Submitted on: Sep 8, 2018
Accepted on: Oct 26, 2018
Published on: Jun 3, 2019
Published by: University of Gdańsk
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year
Keywords:
Chamaepinnularia tongatensis,
Navicula thermophila,
species distribution,
ecology,
springs,
thermo-mineral waters
Related subjects:
Chemistry,
Chemistry, other,
Geosciences,
Geosciences, other,
Life sciences,
Life sciences, other

© 2019 Giuseppina Grazia Lai, Luc Ector, Bachisio Mario Padedda, Antonella Lugliè, Carlos Eduardo Wetzel, published by University of Gdańsk
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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