5 research outputs found

    Annual changes in serum calcium and inorganic phosphate levels and correlation with gonadal status of a freshwater murrel, Channa punctatus (Bloch)

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    Adult Channa punctatus murrels of both sexes (60-80 g) were collected locally from Ramgarh Lake during the second week of every month (10 individuals of each sex/month) throughout the year. Blood samples were collected and analyzed for serum calcium and phosphate levels by the methods of Trinder (1960) and Fiske and Subbarow (1925), respectively. Gonads were fixed to judge the state of maturation of the fish. Males exhibited no change in serum calcium levels throughout the year in correlation with testicular maturation. However, serum phosphate levels exhibited a rise in correlation with the increased gonadosomatic index. Females showed marked seasonal changes in serum calcium and phosphate levels which were associated with ovarian maturation (vitellogenesis)

    The problem and promise of coproduction: Politics, history, and autonomy

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    Interest in coproduction has continued to grow since Elinor Ostrom introduced the concept to the development scholarship two decades ago. The idea that multiple actors often interact to coproduce public goods and services helped shift development thinking away from one-size-fits-all policy prescriptions based on free market principles to a more nuanced position that recognizes organizational and institutional diversity. However, while Ostrom’s concept of coproduction provides a useful starting point to think about how states and societies interact to deliver public goods and services, it fails to capture the complexity and significance of the process. The diverse scholarship that has extended and critiqued her work has provided a fuller picture. Yet, important gaps remain. The principal aim of this article is to fill some of these gaps and expand the boundaries of coproduction research and analysis. Drawing on qualitative research on water services and management in Ecuador, it focuses on two interrelated issues that are overlooked or underdeveloped in the existing literature. The first relates to the history of coproduction. The article shows that coproduction is more deeply rooted in capitalist development than commonly believed, and historical events have a significant bearing on contemporary politics. The second concerns autonomy. The essay shows that coproduction simultaneously promotes engagement with and autonomy from the state, and that this tension generates political struggle and change. More broadly, the article casts fresh light on the politics of public goods and services in the Global South, especially on the political impact of collective social participation in the process

    Groundwater estuaries of salt lakes: buried pools of endemic biodiversity on the western plateau, Australia

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    Subterranean or groundwater estuaries occur in porous and cavernous substrates where groundwater abuts the ocean. Like surface estuaries, they are strongly stratified, temporally and hydrochemically heterogeneous environments that support complex hydrogeochemical and biological processes and ecological communities. Here, we contend that groundwater estuaries also occur where groundwater flow approaches salt lakes and provide evidence in the context of groundwater (valley or phreatic) calcretes in palaeovalleys of the arid western plateau of Australia. The calcrete groundwater estuaries display marked and complex physico-chemical gradients along, across and through the groundwater flow path. From the first principles and the density differences between water bodies, we may expect the form and dynamics of the saltwater front to mimic that of marine estuaries but with the dynamic and temporal response to changing hydrology heavily dampened, and driven by the episodic groundwater recharge and lake filling typical of arid regions. The calcrete aquifers support diverse biological communities of obligate groundwater animals, largely endemic to a given calcrete body. These communities comprise both macro and microinvertebrates, predominantly a suite of crustacean higher taxa, and a great diversity of diving beetles (Dytiscidae) isolated in the calcrete aquifers between ca. 5 and 8 million years ago. © 2009 Springer Science+Business Media B.V.W. F. Humphreys, C. H. S. Watts, S. J. B. Cooper, R. Leij
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