On choice of substrate and habitat in brachionid rotifers

Pejler, Birger; Bērziņš, Bruno

doi:10.1007/978-94-009-0465-1_16

Cited by 24 publications

(3 citation statements)

References 26 publications

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“…More mobile forms are expected to be less dependent on their substrate than those less mobile (e.g. Pejler, 1962;Pejler & Berzins, 1989). Cyr & Downing (1988b) considered the differences in numbers of macroinvertebrates between various macrophyte associations to be a result of the joint impact of a suite of factors, including plant morphology, surface texture, epiphytic algal growth and community composition, nutrient content of plant tissues, and presence of defensive chemicals.…”

Section: Discussionmentioning

confidence: 99%

The influence of macrophytes on the spatial distribution of littoral rotifers

et al. 2001

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1. The effect of macrophytes on the spatial distribution of littoral rotifers was examined in Lake Rotomanuka, New Zealand (37°55′S, 175°19′E). Total rotifer abundances and those of abundant species, were compared between three macrophyte species, Myriophyllum propinquum, Eleocharis sphacelata and Egeria densa, and spatially across a littoral transect in relation to these species. 2. The abundances of many species, for example Euchlanis dilatata, Lecane closterocerca and L. lunaris, differed significantly between macrophyte species. More planktonic forms, Ascomorpha saltans, Keratella cochlearis and Synchaeta oblonga, however, showed no significant preference for macrophyte species. 3. Differences in rotifer abundances were evident even when different species of macrophyte grew in close proximity to one another, indicating that variations in physical and chemical conditions, which occur in the littoral of Lake Rotomanuka, could be largely discounted for much of the variation between macrophyte species. 4. Variation in rotifers between macrophytes was probably the result of a number of factors, including differences in macrophyte morphology, macrophyte age, epiphytic algal growths and the differential effects of predation by invertebrates and fish between macrophytes. 5. Variability of rotifer abundances spatially across the ecotone was less marked than between macrophyte species. The species of macrophyte occurring, and therefore the community composition and distribution of macrophyte species in the littoral, appears to be a major influence in the spatial structuring of rotifer communities in the littoral region of lakes.

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Section: Discussionmentioning

confidence: 99%

The influence of macrophytes on the spatial distribution of littoral rotifers

et al. 2001

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“…Pejler (1980) summarized studies on variation in the genus Keratella . Relationships between temperature, water fecundity and occurrence of different morphological forms of Keratella cochlearis were recorded by Pejler 1962 ;Hillbricht-Ilkowska 1972Ruttner-Kolisko, 1972, 1974, Lindstrom & Pejler, 1975Eloranta, 1982 ;Pejler & Berzins 1989 . Interesting observations by Hillbricht-Ilkowska (1983) in Lake Biwa showed that not only temperature, but also concentration of food influence the length of the posterior spine of Keratella cochlearis . Pejler (1957Pejler ( , 1962 in Swedish Lakes, Nauwerk (1978) in Lake Ontario, and Hofmann (1980Hofmann ( , 1983 in Holstein Lakes did not notice transitional forms during their investigations on morphological variation in Keratella cochlearis .…”

Section: Introductionmentioning

confidence: 98%

Influence of temperature on morphological variation in populations of Keratella cochlearis (Gosse) in Rybnik Reservoir

Biela�ska-Grajner¹

1995

Hydrobiologia

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Morphological changes in a population of Keratella cochlearis were investigated in a reservoir of changed temperature and high trophy . Four morphological forms were distinguished : Keratella cochlearisf. cochlearis, K cochlearis varr tecta f. micracantha, K cochlearis varr tecta f. typica and K. cochlearis f. macracantha . A correlation between the length of the lorica and the posterior spine, and the temperature of water was observed . These four forms of Keratella cochlearis occurred during the entire period of investigations .

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“…It sharply decreased to the lowest reading in winter season in two rayahs. Pejler and Bērziņš (1989) and Koste (1978) believed that, Keratella cochlearis is one of the most common representatives of the family Brachionidae and is known to inhabit a diverse range of waters. The dominant result of Keratella cochlearis agreed with ( Pace et al, 1992;Van Dijk and Van Zanten, 1995;May and Bass, 1998;Burger et al, 2002;Khalifa,2014 andBendary, 2016).…”

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confidence: 99%

Comparative analysis of rotifer community in two Rayahs of River Nile, Egypt

2017

Journal of Egyptian Academic Society for Environmental Developm

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The rotifer communities were determined in El-rayah El-Nasery and El-rayah El-Tawfeky (Egypt) as small branches of River Nile by tracking seasonally variations in diversity and population density. It was found that the annual density of rotifers in El-Rayah El-Nasery (5442000 Ind. /m³) was higher than that in El-Rayah El-Tawfeky (3680000 Ind./m³).The highest density of rotifer occurring in spring season but the lowest density occurring in winter season in the two rayahs. A total of 40 rotifer species were identified in the present study. The highest number of species and richness was observed in summer and the lowest number and richness was recorded in winter season. Of these species, Prolides sp, Keratella cochlearis ,k. tropica, Brachionus calyciflorus, B. caudatus, Polyarthra vulgaris, Philodina roseola and Tricocerca pusilla were abundant. 148Gamal M. El-Shabrawy et al. MATERIALS AND METHODS Sites study:Rayahs are the main channels of fresh water from Damietta and Rosetta branches, which are vital for irrigation, navigation, fishing and other domestic uses in Egypt. Two rayahs were investigated in this study;1-El-Rayah El-Towfiky which starts from the Damietta branch at el-Kanater station and extends into the middle and the east of Delta heading north parallel to the Damietta branch until Mansoura city at station (T5) and then heading East ward within Dakahlia governorate even Manzalah city. This rayah extends with average length of 180-200 Km from El-Kanater and with average width 40-50 m and its average depth 2-3 m. this rayah characterized by existence of many water plants and electricity stations on its beaches which include large water stations such as: Banha station and small water stations which heavily scattered on both sides of Rayah. This Rayah branched at the Mansoura city into sub-main branches: the first one: extending north to Damietta city, it is characterized by a lack of water and lack of breadth (little width); almost water disappears in Faraskour city. So the water samples are not collected from this branch. The second: run east to Dekerness, El-Gamalia and El-Manzalah. This branch ends into Manzalah Lake previously but now it doesn't reach it. Also this branch is characterized with abundantly water as compared with the first branch. Seven samples were collected from this branch. 2-El-Rayah El-Nassery starts from the Rosetta branch at El-Kanater and runs in the West ofDelta where it is heading northwest in the direction of Nubaria canal, and meet it at Kanater Pauline (Kom Hamada), then heading to the northwest even Mediterranean Sea breaking Mariot Lake. The length of This Rayah could be up to 200 Km from El-Kanater and with average width 40-50 m and its average depth 2-3 m. This rayah characterized by existence of many water plants and electricity stations on its beaches especially on El Nubaria canal. Eight samples were taken from this rayah. Fig (1): Map of El-Rayah El-Tawfeky and El-Rayah El-Nasery demonstratingthe collected Stations. 149Comparative analysis of rotifer community in t...

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On choice of substrate and habitat in brachionid rotifers

Cited by 24 publications

References 26 publications

The influence of macrophytes on the spatial distribution of littoral rotifers

The influence of macrophytes on the spatial distribution of littoral rotifers

Influence of temperature on morphological variation in populations of Keratella cochlearis (Gosse) in Rybnik Reservoir

Comparative analysis of rotifer community in two Rayahs of River Nile, Egypt

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