The first discovery of an encysted chrysophyte in Africa: Dinobryon sertularia Ehrenb. from Cameroon

Lenarczyk

2020

Sci Rep

Self Cite

The chrysophyte genus Dinobryon Ehrenberg consists of 44 taxa, which occur in freshwaters, rarely marine waters, mostly in temperate regions of the world. The taxa of Dinobryon produce characteristic solitary or dendroid colonies and resting stages called stomatocysts. Only 20 Dinobryon taxa have information on produced stomatocysts and only four stomatocysts are reliably linked with vegetative stages using modern identification standards employing scanning electron microscopy (SEM) analyses. In this study, an encysted material of Dinobryon pediforme (Lemmermann) Steinecke was collected in two lakes in contrasting regions of Poland. Light microscopy (LM) and scanning electron microscopy (SEM) analyses revealed that Dinobryon pediforme produces stomatocyst #61, Piątek J. that is described here as new morphotype following the International Statospore Working Group (ISWG) guidelines. This raises to five the number of reliable links between vegetative stages of Dinobryon species and corresponding stomatocysts. Phenotypic similarities between Dinobryon species and their stomatocysts, analysed for five reliably established links, showed no relationships in size and shape between loricas and stomatocysts belonging to the same species. The morphological characters of loricas and stomatocysts mapped onto the phylogenetic tree of the five Dinobryon species revealed only little congruence between their morphology and phylogenetic relationships.

Section: Methodsmentioning

confidence: 86%

“…A good example might be the case of D. sertularia, which was recorded many times from all continents except Antarctica, while its stomatocyst -stomatocyst 48, Piątek J. 2012 21 was recorded only from Africa.…”

Section: Discussionmentioning

confidence: 99%

Assessing morphological congruence in Dinobryon species and their stomatocysts, including a newly established Dinobryon pediforme–stomatocyst connection

Lenarczyk

2020

Sci Rep

Self Cite

“…This may be compared with observations on chrysophytes in other African samples, from ponds of Cameroon, Nigeria and Zimbabwe, for which some basic ecological data are known. Therein, the chrysophytes were found in water reservoirs with similar temperatures (between 22-29 °C in Lake Kariba, around 30 °C in two other ponds in Zimbabwe- Cronberg & Hickel 1985, Cronberg 1988b, 1989bbetween 26-33 °C in Lekki Lagoon, Nigeria-Wujek et al 2003-200429.5 °C in small pond in Cameroon-Piątek et al 2012), pH (between 7.26-8.15 in Lake Kariba, Zimbabwe-Cronberg 1989bbetween 6.1-7.7 in Lekki Lagoon, Nigeria-Wujek et al 2003-20047.8 in small pond in Cameroon- Piątek et al 2012), with similar (35 µS•cm -1 in small pond in Cameroon- Piątek et al 2012), but usually with much higher electrolytic conductivity (640-1230 µS•cm -1 in Lake Kariba, Zimbabwe-Cronberg 1989b; 200-1000 µS•cm -1 in Lekki Lagoon, Nigeria- Wujek et al 2003Wujek et al -2004. Interestingly, similar environmental conditions (pH between 5.8-6.8, conductivity between 12-82 µS•cm -1 ) were detected in several Nigerian rivers that have diverse assemblages of chrysophyte species (Wujek et al 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Stomatocysts are species-specific, but only 10-15% of them are conclusively linked with living chrysophytes (e.g. Smol 1984, Cronberg 1988a, 1989a, 1992, 1995, Kristiansen 1989, Siver 1991, Cronberg & Laugaste 2005, Coradeghini & Vigna 2008, Kim & Kim 2008, Piątek & Kowalska 2008, Findenig et al 2010, Piątek et al 2012, mainly because of difficulty with findings of encysting chrysophytes in nature and culture experiments.…”

Section: Introductionmentioning

confidence: 99%

Morphological variability of new chrysophyte stomatocyst forming a single-cyst assemblage in a low-conductivity tropical lake in the Guineo-Congolian rainforest

2014

Phytotaxa

Self Cite

Morphological variation of the chrysophyte stomatocyst found in surface sediments of a small, shallow lake in the Guineo-Congolian rainforest in eastern Cameroon, is described, illustrated and discussed. Neither living cells nor scales of chrysophytes were observed in the lake. The stomatocyst cannot be assigned to any known cyst and is described as new to science (stomatocyst #49) using International Statospore Working Group (ISWG) guidelines. This is the third report of stomatocysts in Africa, and the second from the tropical part of this continent. Some basic ecological information on the sampling site is provided and compared with similar data from other sampling sites of chrysophytes in Africa.

“…B. Hansen, both newly recorded in Cameroon and Central Africa (Piątek & Mossebo 2008), encysted specimens of Dinobryon sertularia Ehrenb. representing the first finding of an encysted chrysophyte in Africa (Piątek et al 2012), as well as a new chrysophyte stomatocyst (stomatocyst 49 J. Piątek & Piątek 2014).…”

Section: Introductionmentioning

confidence: 99%

Mallomonas Camerunensis Sp. Nov. (Chrysophyceae, Stramenopiles) From A Shallow Puddle In The Guineo-Congolian Rainforest (Cameroon)

Polish Botanical Journal

2015

Self Cite

Abstract.A new silica-scaled chrysophyte species, Mallomonas camerunensis J. Piątek, is described and illustrated from a shallow puddle in the Guineo-Congolian rainforest in Cameroon. This species belongs to section Papillosae and series Papillosa. differs from them in several morphological characters warranting recognition as a distinct species. The dome of M. camerunensis is clearly delimited and ornamented with papillae and ribs. The scales lack an anterior submarginal rib, while the posterior rim and V-rib are smooth and unornamented. The shield is thickly ornamented with papillae (18-22 papillae per scale width). The species is described and illustrated using light microscopy and scanning electron microscopy.