AUXOSPORULATION OF THE FRESHWATER DIATOM<i>AULACOSEIRA HERZOGII</i>IN LAKE BANANI, BANGLADESH

Jewson, David H.; Khondker, Moniruzzaman; Rahman, Mujibur; Lowry, Stephen F.

doi:10.1080/0269249x.1993.9705270

Cited by 24 publications

(8 citation statements)

References 8 publications

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“…Bangladesh, because of its geographical location holds adequate reserves of freshwater but due to excessive population pressure very few of her water bodies retain good water quality and aquatic biodiversity. A number of limnological investigations have been carried out in some man-made lakes situated in and around Dhaka metropolis (1)(2)(3)(4) to evaluate their water quality and biodiversity. Urban based man-made lakes are usually created for meeting the demands of emergency water supply and to fulfil aesthetic and environmental needs.…”

Section: Introductionmentioning

confidence: 99%

Limnology of a conserved man-made lake in Bangladesh. I. Physical and chemical factors

Begum

Khondker

Islam

2012

Dhaka Univ. J. Biol. Sci

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Limnological investigation on a conserved man-made lake located in the Safipur Ansar and VDP Academy, Gazipur district has been carried out between July, 2008 and May, 2009. Thirteen limnological parameters were measured mostly at fortnight intervals and their annual and seasonal fluctuations were observed. The lake water was slightly alkaline in nature having a monthly mean pH range 7.26 -7.91. The water temperature varied from 18 -32°C. Soluble reactive phosphorus, soluble reactive silicate and nitrate nitrogen ranged from 9.22 -154.57 μg/l, 2.52 -17.06 and 0.17 -187 mg/l, respectively.

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Section: Introductionmentioning

confidence: 99%

Limnology of a conserved man-made lake in Bangladesh. I. Physical and chemical factors

Begum

Khondker

Islam

2012

Dhaka Univ. J. Biol. Sci

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“…Similarly, a small difference between inducible and asexual cells was also found in Aulacoseira herzogii (Lemmermann) Simonsen (Jewson et al 1993). Valve diameter differences between the non-induced cells and AMCs were also statistically significant; even though means of valve diameters differed by only about 1 mm.…”

Section: Sexualized and Asexual Cell Morphology And Developmentmentioning

confidence: 56%

“…The frequency and magnitude of sexual episodes in natural waters is a poorly understood aspect of diatom biology and only a few reports are available for natural populations (Jewson 1992a,b, Waite and Harrison 1992, Jewson et al 1993, Crawford 1995. Compared to those studies, our inductions, in particular the fall induction of the clone PB001, are higher.…”

Section: Discussion Sexualizationmentioning

confidence: 78%

Autogamic reproductive behavior and sex cell structure in Thalassiosira angulata (Bacillariophyta)

Mills

Kaczmarska²

2006

Botanica Marina

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Our understanding of diatom reproduction is limited, especially for marine planktonic centric diatoms. This project aimed to elucidate sexual behavior and gametogenesis in the mediophycean diatom, Thalassiosira angulata, and to determine the fine structure of its reproductive cells. A monoclonal culture of T. angulata was successfully induced and enumerated, and all stages of auxosporulation documented. Spermatogenesis was absent in all inductions. Nuclear behavior of the auxospore mother cell (AMC) during auxosporulation indicated that reproduction was autogamic. In our clone, reproduction began with a differentiating mitosis and subsequent pervalvar expansion of the AMC, a meiocyte. The smaller cell often continued normal vegetative growth. In the AMC, meiosis I was acytokinetic and resulted in one viable haploid and one pycnotic nucleus. Meiosis II resulted in the production of two viable haploid nuclei, which we postulate later fused to produce the zygotic nucleus. Cell expansion was observed in very young AMCs both prior to and following autosyngamy. The initial cell valves were produced after at least two acytokinetic and pycnotic mitotic divisions, after which the cell was capable of undergoing its first normal mitosis involving production of two sibling hypovalves.

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“…Edlund and Stoermer () characterized this reproductive strategy in diatoms as asynchronous sexuality under good growth conditions. Jewson, Khondker, Rahman, and Lowry () observed similar auxosporulation conditions in A . herzogii .…”

Section: Diatoms As the Next Model Organism In Resurrection Ecologymentioning

confidence: 69%

Paleolimnology and resurrection ecology: The future of reconstructing the past

Burge

Edlund

Frisch

2017

Evolutionary Applications

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Paleolimnologists have utilized lake sediment records to understand historical lake and landscape development, timing and magnitude of environmental change at lake, watershed, regional and global scales, and as historical datasets to target watershed and lake management. Resurrection ecologists have long recognized lake sediments as sources of viable propagules (“seed or egg banks”) with which to explore questions of community ecology, ecological response, and evolutionary ecology. Most researchers consider Daphnia as the primary model organism in these efforts, but many other aquatic biota, from viruses to macrophytes, similarly produce viable propagules that are incorporated in the sediment record but have been underutilized in resurrection ecology. The common goals shared by these two disciplines have led to mutualistic and synergistic collaborations—a development that must be encouraged to expand. We give an overview of the achievements of paleolimnology and the reconstruction of environmental history of lakes, review the untapped diversity of aquatic organisms that produce dormant propagules, compare Daphnia as a model of resurrection ecology with other organisms amenable to resurrection studies, especially diatoms, and consider new research directions that represent the nexus of these two fields.

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AUXOSPORULATION OF THE FRESHWATER DIATOMAULACOSEIRA HERZOGIIIN LAKE BANANI, BANGLADESH

Cited by 24 publications

References 8 publications

Limnology of a conserved man-made lake in Bangladesh. I. Physical and chemical factors

Limnology of a conserved man-made lake in Bangladesh. I. Physical and chemical factors

Autogamic reproductive behavior and sex cell structure in Thalassiosira angulata (Bacillariophyta)

Paleolimnology and resurrection ecology: The future of reconstructing the past

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