Scale‐bearing chrysophytes from tropical Northeast India

Abstract

1990. Scale-bearing chrysophytes from tropical Northeast India. -Nord. J. Bot. 10: 343-354. Copenhagen. ISSN 0107-055x. This is the first publication describing scale-bearing Chrysophyceae from India by means of electron microscopy. 'henty seven such taxa are described from samples for ponds, rivers and thermal springs. 'henty of these are Mallomonas spp.: M . akrokomos, M. bronchartiana, M . caudata, M . ceylanica, M. costata, M. crassisquama, M. cyathellata var. cyathellata, M. cyathellata var. chilensis, M . cyathellata var. kenyana, M. gunata, M. heterospina, M . mangofera f. mangofera, M . mangofera f. foveata, M . mangoferea f. reticulata, M . matvienkoae f. matvienkoae, M . matvienkoae var. grandis, M. morrisonensis, M . peronoides, M . portae-ferreae, and M . tasmanica. Three are Synura taxa: S. curtispina, S. petersenii f. petersenii, and S. petersenii f. kufferathii. ' h o are Spiniferomonas species: S. coronacircumspina and S.enigmata. Paraphysomonas and Chrysosphaerella were each represented by one species: P. vestita and C. longispina. The water bodies from which these samples were taken were mostly eutrophic and nutrient rich. The majority of the taxa were obtained during the summer months when water temperatures were high. This contradicts the widely held belief that silica-scaled chrysophytes are mainly found in cold oligotrophic and mesotrophic waters. Mallomonas portae-ferreae and one unidentified species of Mallomonas were recorded also from thermal springs having water temperatures up to 50°C.

Morphological delineation and distribution patterns of four newly described species within theSynura peterseniispecies complex (Chrysophyceae, Stramenopiles)

“…All 12 isolated strains of S. hibernica originated from nutrient-poor localities, with conductivity values ranging between 23-87 µS cm −1 (Table 1). To our knowledge, all records of S. australiensis have been associated with clear, oligotrophic water bodies (Croome & Tyler, 1985;Cronberg, 1989Cronberg, , 1996Saha & Wujek, 1990;Wee et al, 1993;Hansen, 1996). The measured conductivity of these water samples was 10-123 µS cm −1 .…”

A lakeland from the dreamtime the second founders' lecture

“…However, claims of endemicity should be treated cautiously. Some species of Mallomonas and Synura regarded as Australian endemics (Croome & Tyler, 1983b-c, 1985a) have since been located in the tropics (Asmund & Kristiansen, 1986;Saha & Wujek, 1990). Illustrations and further details of unique Australian freshwater algae can be found in Tyler & Wickham (1988 and references).…”

Synurophyte Algae**This chapter is dedicated to my mother, Helen Jean Siver. THANKS, MOM.

“…In North America, rich and diverse floras of synurophytes have been documented from subtropical localities in Florida (Wujek, 1984a;Wujek and Bland, 1991;Siver and Wujek, 1993;Siver and Lott, 2006) and Louisiana (Wee et al, 1993). Similarly, even though scaled chrysophytes comprise a larger percentage of the annual phytoplanktonic biomass of oligotrophic and mesotrophic lakes (see the discussion below), ample studies demonstrate that large numbers of species also can be found in more eutrophic sites (Kristiansen, 1985(Kristiansen, , 1988b(Kristiansen, , 2005Hickel and Maass, 1989;Gutowski, 1989Gutowski, , 1997Saha and Wujek, 1990). For example, Kristiansen and Tong (1989) and Kristiansen (1985) recorded 40 and 33 taxa of scaled chrysophytes in highly eutrophic ponds in China and Denmark, respectively.…”

“…Based on literature records Siver (1991a) Conrad, and to a lesser extent, M. elongata, and M. pseudocoronata, to be more common in eutrophic localities. M. heterospina is often reported from dung or waterfowl-contaminated ponds (Harris and Bradley, 1957;Kristiansen, 1986;Siver, 1991a), and there appears to be ample evidence that M. matvienkoae (Saha and Wujek, 1990;Siver and Vigna, 1997) and M. oviformis (Wei and Yuan, 2001) are also common in eutrophic habitats. S. sphagnicola (Kristiansen, 1986;Siver, 1988a) and S. spinosa f. longispina Petersen & Hansen (Dürrschmidt, 1982;Siver, 1987) are other oligotrophic indicators, while S. curtispina (Petersen & Hansen) Asmund (Gutowski, 1989;Santos and Leedale, 1993;Siver and Marsicano, 1996) is often observed to tolerate eutrophic conditions.…”