Morphological Variation of<i>Keratella cochlearis</i>(Rotatoria) in a Shallow, Eutrophic Subtropic Chinese Lake

Xi, Yi-Long; Jin, Hongjun; Xie, Ping; Huang, Xiang-Fei

doi:10.1080/02705060.2002.9663919

Cited by 9 publications

(6 citation statements)

References 6 publications

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“…are common Niu 2007 and. Polymorphic morphotypes of Keratella species were also found in both field and laboratory studies (Gilbert and Stemberger 1984, Stemberger and Gilbert 1987, Xi et al 2002E-mail: ylxi 1965@yah0o.c0m.cn 2005. Morphological variation in polymorphic rotifer species can be induced by different environmental conditions, such as temperature and food concentration, and may be accompanied by altered physiology, life history, or behavior (Sarma and Rao 1987, Sanoamuang 1993, Hansen et al 1997.…”

Section: Effects Of Temperature On Survival Reproduction and Morphomentioning

confidence: 88%

“…Polymorphism was widely pronounced in planktonic rotifers, especially in species of Brachionus and Keratella (Nayar 1965, Gilbert 1999, Xi et al 2002, Green 2005, Yin and Niu 2007, Athibai and Sanoamuang 2008. In natural water bodies, several morphotypes of Brachionus calycijlorus have been reported (Koste 1978, Pontin 1978, Kutikova and Femando 1995, Li et al 2008).…”

Section: Effects Of Temperature On Survival Reproduction and Morphomentioning

confidence: 93%

“…Morphological variation in polymorphic rotifer species can be induced by different environmental conditions, such as temperature and food concentration, and may be accompanied by altered physiology, life history, or behavior (Sarma and Rao 1987, Sanoamuang 1993, Hansen et al 1997. The posterior spine length of Keratella cochlearis was negatively correlated with water temperature (Hillbricht-Ilkowska 1983, Bielanska-Grajner 1995, Eloranta 1982, Dieguez et al 1998, Xi et al 2002, Green 2005, and the posterior spines in Brachionus caudatus f. apsteini were induced by low temperature (Athibai and Sanoamuang 2008).…”

Section: Effects Of Temperature On Survival Reproduction and Morphomentioning

confidence: 97%

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Effects of Temperature on Survival, Reproduction, and Morphotype in Offspring of TwoBrachionus calyciflorus(Rotifera) Morphotypes

Xiang

Zhang

et al. 2010

Journal of Freshwater Ecology

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Two-spined and unspined Brachionus calycijlorus were cultured at 15 C , 2072, 25'C, and 30'C to investigate their differences in life expectancy at hatching, average lifespan, generation time, net reproductive rate, intrinsic rate of population increase, proportion of mictic offspring, and proportion of spined offspring. Life history parameters between the two B. calyc~jlorus morphotypes differed with temperature. At 15"C, the unspined rotifer had a higher intrinsic rate of population increase than the two-spined rotifer. At 20%, the proportion of spined offspring produced by the two-spined rotifer was higher than that produced by the unspined rotifer. At both 25% and 30eC, the two-spined rotifer had a longer average lifespan than the unspined rotifer. At 30°C, net reproductive rate of the two-spined rotifer was higher than that of the unspined rotifer. The responses in average lifespan, net reproductive rate, intrinsic rate of population increase, and proportion of spined offspring to increasing temperature differed between the two morphotypes. When the temperature increased from 20°C to 30aC, the rate of reduction of average lifespan of unspined rotifers was higher than that of two-spined rotifers. The net reproductive rate of the two-spined rotifer at 3072 was the highest, but the net reproductive rates of unspined rotifer at all the four temperatures were similar. When the temperature increased from 15°C to 20C, the intrinsic rate of population increase of the unspined rotifer decreased faster than that of the two-spined rotifer. The proportion of spined offspring produced by the two-spined rotifer at all temperatures were similar, but the proportion of spined offspring produced by the unspined rotifer at 15 C was higher than that at 20°C, and both of them were similar with those at 25°C and 30'C. At all the four temperatures, each morphotype of B. calyciflorus produced two-spined and unspined offspring. At 25'C, two-spined rotifer also produced single-spined offspring.

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Section: Effects Of Temperature On Survival Reproduction and Morphomentioning

confidence: 88%

Section: Effects Of Temperature On Survival Reproduction and Morphomentioning

confidence: 93%

Section: Effects Of Temperature On Survival Reproduction and Morphomentioning

confidence: 97%

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Effects of Temperature on Survival, Reproduction, and Morphotype in Offspring of TwoBrachionus calyciflorus(Rotifera) Morphotypes

Xiang

Zhang

et al. 2010

Journal of Freshwater Ecology

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“…Additionally, as the most abundant taxa in Lake Longwo, Lake Fengming, and Lake Yinhu, K. cochlearis should be investigated more because of the two morphological forms of K. cochlearis cochlearis and K. cochlearis tecta, the former is considered as oligotrophic and cold-water species (Hillbricht-Ilkowska, 1983), and the latter is influenced by the degree of eutrophication (Xi et al, 2002). Notably, L. aculeate, L. doryssa, and L. inermis were observed only in Lake Yinhu, which was likely to be related to the submerged macrophytes in this lake, because it has been shown that the genera Lecane inhabited in Table 1 for the symbols of rotifer species; SD transparency, TN total nitrogen, TP total phosphorus, Wt Water temperature) Hydrobiologia (2011) 661:303-316 311 macrophyte-associated water body (Duggan et al, 2001b;Green, 2003;Kuczyńska-Kippen, 2009).…”

Section: Discussionmentioning

confidence: 99%

Comparative analysis of rotifer community structure in five subtropical shallow lakes in East China: role of physical and chemical conditions

Wen

Qian

et al. 2010

Hydrobiologia

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Worldwide, there have been few comparative studies on rotifer communities in subtropical lakes. We studied changes in rotifer community structure over 1 year and its relationship to several physicochemical variables in five subtropical shallow lakes in East China, covering a nutrient gradient from mesotrophy to moderate eutrophy. In these lakes, the genera Brachionus, Lecane, and Trichocerca dominated the rotifer species composition, and Polyarthra dolichoptera, Keratella cochlearis, Filinia longiseta, T. pusilla, and Anuraeopsis fissa were the dominant species. With increased nutrient loading, total rotifer abundance and species dominance increased, indicating that rotifer abundance might be a more sensitive indicator of trophic state than species composition. Comparative analyses of the six rotifer community indices calculated in this study and redundancy analysis (RDA) revealed that the two slightly eutrophic lakes and the other two moderately eutrophic lakes exhibited a high degree similarity in community structure. This suggests that the trophic state of a lake determines the rotifer community structure. In contrast, in the two moderately eutrophic lakes, the mass ratios of TN:TP and the contents of TP suggested N-limitation and cyanobacteria dominance in phytoplankton communities might be possible. In these lakes TN played a more important role in shaping the rotifer community according to stepwise multiple regression and RDA. RDA analysis also suggested that rotifer species distribution was strongly associated with trophic state and water temperature, with water temperature being the most important factor in determining seasonality.

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“…In monogonont rotifers, cryptic species complexes have been described for species such as Brachionus plicatilis (Gómez & Serra, 1995;Gómez & Snell, 1996;Gómez et al, 2002), B. calyciflorus (Schröder & Walsh, 2007;Xi et al, 2011), Epiphanes senta (Gilbert & Walsh, 2005), Lecane spp. (García-Morales & Elías-Gutiér-rez, 2013), Polyarthra dolichoptera (Obertegger et al, 2014), Synchaeta spp.…”

Section: Introductionmentioning

confidence: 99%

High diversity in Keratella cochlearis (Rotifera, Monogononta): morphological and genetic evidence

2016

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Rotifers are ubiquitous freshwater animals for which many complexes of cryptic species (i.e. distinct species that are morphologically difficult to distinguish) are described. Keratella cochlearis occurs globally and shows a wide phenotypic diversity indicating the potential presence of a species complex. We sampled lakes of the Trentino-South Tyrol region (Italy) and investigated mitochondrial genetic diversity in K. cochlearis in relation to detailed lorica measurements. We sequenced the mitochondrial cytochrome c oxidase subunit I and used the generalised mixed Yule coalescent approach, Poisson tree process model and automatic barcode gap discovery to delimit mitochondrial groups, associated with putative evolutionary significant units (ESUs). Based on 248 sequences, eight putative ESUs were indicated that could only partially be delimited by lorica morphology. Specifically, several morphological characteristics (i.e. spinelets, bended median ridge, and posterior spine) were found in specimens of different putative ESUs, and thus, these characters seem to be of poor discriminatory value. Furthermore, different putative ESUs of K. cochlearis were found in the same lake. We conclude that the high mitochondrial genetic diversity may be linked to tolerance of K. cochlearis to varying environmental conditions.

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Morphological Variation ofKeratella cochlearis(Rotatoria) in a Shallow, Eutrophic Subtropic Chinese Lake

Cited by 9 publications

References 6 publications

Effects of Temperature on Survival, Reproduction, and Morphotype in Offspring of TwoBrachionus calyciflorus(Rotifera) Morphotypes

Effects of Temperature on Survival, Reproduction, and Morphotype in Offspring of TwoBrachionus calyciflorus(Rotifera) Morphotypes

Comparative analysis of rotifer community structure in five subtropical shallow lakes in East China: role of physical and chemical conditions

High diversity in Keratella cochlearis (Rotifera, Monogononta): morphological and genetic evidence

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