<i>Craticula widouensis</i>, a new diatom (Bacillariophyta) species of a Sahelian temporary pond (North Senegal)

Beauger, Aude; Wetzel, Carlos E.; Peiry, Jean‐Luc; Voldoire, Olivier; Éctor, Luc

doi:10.1080/23818107.2019.1623715

Cited by 4 publications

(1 citation statement)

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“…This increase of ammonium could have two reasons: (1) the direct impact of the cattle with their urine and excrements as they defecate occasionally directly into the pond or in its immediate surroundings (Figure 2b), or (2) the result of a process of incomplete degradation of organic matter [46]. The sediment depth in the pond (reaching 40 cm in the deepest part), the reduced water volume, and the lack of water input contribute to the bacteriological decomposition of soluble organic substances, increasing in this way the ammonium nitrogen concentration only in this shallow pond compared to another pond [47]. Associated with this high ammonium concentration, different mesotrophic to hypereutrophic species were present: Neidium affine, Nitzschia palea, N. palea var.…”

Section: Discussionmentioning

confidence: 99%

Temporal Evolution of Diatoms in a Temporary Pond Situated in the Massif du Sancy Mountains (Massif Central, France) and Description of a New Pinnularia Species

et al. 2020

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A floristic survey was performed on a temporary pond, “Laqui du Seignavoux”, situated in the Mont-Dore massif of the French Massif Central, between 2017 and 2019. Except in 2017, each year, we performed four sampling campaigns from April/May to December. Water samples and diatoms were collected. The temporary pond evolved from a poorly mineralized ecosystem due to snow, inducing oligotrophic and oligosaprobic water, well oxygenated in spring, to a more mineralized, less oxygenated, eutrophic–hypereutrophic, and polysaprobic environment in summer. This change in abiotic conditions was found to be linked to the presence of cattle, beginning in May, that trample and excrete in the pond, leading to higher ammonium and nitrate concentrations. During this period, the dominant species were Pinnularia sp., Nitzschia palea, and Nitzschia palea var. tenuirostris. In spring and winter, different species of Eunotia dominated the community such as Eunotia pseudogroenlandica. Finally, light microscopy (LM) and scanning electron microscopy (SEM) observations on a new species of the genus Pinnularia from the temporary pond are presented and the ecological preferences are discussed.

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Section: Discussionmentioning

confidence: 99%