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The Significance of the pH in the Development of Mosquito Larvae

Published online by Cambridge University Press:  06 April 2009

Malcolm E. MacGregor
Malcolm E. MacGregor
Affiliation:
(Wellcome Bureau of Scientific Research.)
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Extract

1. Previous work by the writer drew attention to the fact that the pH index of natural waters was in some manner correlated with the presence or absence of particular mosquito larvae.

2. The observation led other investigators to study this hypothesis, and a short summary of their published records is given.

3. The actual significance of the pH index was, however, obscure, and the present work has been undertaken to attempt to demonstrate the actual significance of the pH in mosquito breeding-places.

4. By gradually eliminating first one and then another of the interacting factors, the writer has been able to demonstrate (a) that if the pH of the normal environment is changed the development of the larvae is adversely affected; (b) that under bacteriologically sterile conditions the foregoing statement is no longer true; and (c) that consequently the acid or alkaline reaction of the medium, within ordinary limits, has no direct effect upon the development of the larvae.

5. Nevertheless, it is shown that the influence of the pH. is of unquestionable importance and that its significance lies in the fact that, under natural conditions, it indicates the favourable or unfavourable association of chemical and biological factors in the breeding-places upon which the successful or unsuccessful development of the larvae depends.

6. It may therefore be stated that although the pH index is not an infallible guide, it does in the majority of instances provide a reliable index as to whether the necessary combination of chemical and biological factors in any given water are such that they will permit the development of the larvae of particular species. Some species find their optimum conditions for development in waters which are acid, others in waters which are alkaline, and it can be shown that to alter the pH of such waters is often to bring about a complete change in the biological group associations, which frequently means the acquired abnormal dominance of factors unfavourable to a particular species of larvae. Clearly, the system is to some extent elastic, and in rare instances what are in general acidophile larvae may be found in waters showing alkalinity.

7. The chief conclusion is, however, that in most instances in various localities the larvae of certain species do actually show a restriction to waters exhibiting a pH index within a definite short range, and that the pH index is consequently often a reliable index also as to whether the chemical and biological group associations will favour or preclude the successful development of such larvae.

8. A new technique is described for the production of a high percentage of successful cultures of Aëdes argenteus larvae and pupae under bacteriologically sterile conditions.

9. The phase of “suspended development” has been investigated and is found to have its probable explanation in the temporary or complete disappearance of micro-organisms on which the conversion of the organic materials of the environment, to a suitable larval diet, depends.

Type
Research Article
Information
Parasitology , Volume 21 , Issue 1-2 , May 1929 , pp. 132 - 157
Copyright
Copyright © Cambridge University Press 1929

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References

Atkin, E. E. and Bacot, A. W. (1916–1917). The Relation between the hatching of the Eggs and the Development of the Larvae of Stegomyia fasciata (Aëdes calopus), and the presence of Bacteria and Yeasts. Ibid. 9, 482–536.CrossRefGoogle Scholar
Atkins, W. R. G. (1923). The Hydrogen-ion Concentration of the Soil and Natural Waters in Relation to Diseases other than Bacterial. Parasitology, 15, 205–210 (June).CrossRefGoogle Scholar
Barber, M. A. (1927). The Food of Anopheline Larvae—Food Organisms in pure Culture. Publ. Health Repts. 42, 1494–1510. Washington, D.C. (3 June).CrossRefGoogle Scholar
Barber, M. A. and Komp, W. H. W. (1922). The Hydrogen-ion Concentration of Waters in relation to Anopheline Production. Trans. 4th Conf. Malaria Field Workers,Chattanooga, Ten.,Nov. 14–16, 1922. Publ. Health Bull. No. 137. (Summarised in Public Health Engineering Abstracts, J–712, Washington, D.C.)Google Scholar
Batchinsky, P. E. (1927). Zur Biologie der Larven von Anopheles und Culex im Zusammenhang mit der Methode der biologischen Analyse von Kolkwitz-Marsson, etc. [In Russian.] Abstr. in Rev. Appl. Ent. B. 15, 153.Google Scholar
Beklemishev, V. and Metrofanova, Y. U. (1926). On the Ecology of the Larvae of Anopheles maculipennis Meigen. The Problem of Distribution. [In Russian.] Bull. Inst. Recherches biol. et Sta. biol. Univ. Perm. 4, 285–332, 2 figs. (18 May. With summary in English, pp. 332–7.)Google Scholar
Buxton, P. A. (1924). Applied Entomology of Palestine, being a Report to the Palestine Government. Bull. Ent. Res. 14, 289–340, 5 plates, 9 figs., 1 map. (March.).CrossRefGoogle Scholar
Buxton, P. A. and Hopkins, C. H. E. (1927). Researches in Polynesia and Melanesia; an Account of Investigations in Samoa, Tonga, the Ellice Oroup and the New Hebrides, in 1924,1925. Parts I–IV. 260 pp., 12 plates, 43 figs. Published by The London School of Hygiene and Tropical Medicine. (July.)Google Scholar
Catanei, A. (1925). Anophèles de hautes régions de la Corse. Présence d'A. bifurcatus, L., et d'A. plumbeus, H. et S., dans l'île. Bull. Soc. Path. Exot. 18, 655–9.Google Scholar
Darling, S. T. (1925). Entomological Research in Malaria: Discussion on the relative Importance in transmitting Malaria of Anopheles quadrimaculatus, punctipennis and crucians and Advisability of differentiating between these species hi applying Control Measures. Southern Med. J. 18, 446–8, 452–6. Birmingham, Ala. (June).CrossRefGoogle Scholar
Domagalla, Juday and Peterson, (1925). The Forms of Nitrogen found in certain Lake Waters. J. Biol. Chem. 63.Google Scholar
Ferguson, E. W. (1925). Mosquito Surveys hi some inland Towns of New South Wales. Rep. Direct. Publ. Health. N.S.W. 1925, pp. 188–193. Sydney.Google Scholar
Gordon, R. M. (1922). Notes on the Bionomics of Stegomyia calopus Meigen in Brazil. Part II. Ann. Trop. Med. and Parasitology, 16, 425–439, 8 tables, 2 figs. (30 Dec.)CrossRefGoogle Scholar
Guyénot, E. (1917). Recherches expérimentales sur la vie aseptique et le développement d'un organisme en fonction du milieu. Thèse, Faculté des Sciences, Paris, 1927. 330 pp. 4 plates. Also Bull. Sci. France et Belgique, 51.Google Scholar
Hacker, P. H. (1923). Annual Report, Malaria Bureau, F.M.S.Google Scholar
Hamlyn-Harris, R. (1927). Notes on the Breeding-places of two Mosquitoes hi Queensland. Bull. Ent. Res. 17, 411–14 (June).CrossRefGoogle Scholar
Hamlyn-Harris, R. (1928). Notes on the breeding habits of Culex fatigans Wied., and its Associated Mosquitoes in Queensland. Proc. Royal Soc. of Queensland, 40, No. 8, pp. 91–103.CrossRefGoogle Scholar
Harold, C. H. H. (1926). Studies on Mosquito Bionomics. J. Roy. Army Med. Corps, 46, 81–94, 180–7, 11 refs. (Aug. and Sept.)Google Scholar
Harvey, H. W. (1925). Oxidation in Sea Water. J. Mar. Biol. Assoc. 13, Pt 3.CrossRefGoogle Scholar
Harvey, H. W. (1926). Nitrate in Sea. J. Mar. Biol. Assoc. 14, Pt 1.CrossRefGoogle Scholar
Harvey, H. W. (1927). Fundamental Problems relating to River Pollution. Nature (26 March).CrossRefGoogle Scholar
Keilin, D. (1927). Fauna of a Horse-chestnut Tree (Aesculus hippocastanum). Dipterous Larvae and their Parasites. Parasitology, 19, 368–374 (19 Dec.).CrossRefGoogle Scholar
Lamborn, W. A. (1922). Some Problems of the Breeding-places of the Anophelines of Malaya. Bull. Ent. Res. 13, Pt 1.Google Scholar
Lamborn, W. A. (1922). The Bionomics of Some Anophelines. Bull. Ent. Res. 13, Pt 2.CrossRefGoogle Scholar
MacGregor, M. E. (1916). Resistance of the Eggs of Stegomyia fasciata (Aëdes calopus) to conditions Adverse to Development. Bull. Ent. Res. 7, Pt 1 (May).CrossRefGoogle Scholar
MacGregor, M. E. (1921). The Influence of the Hydrogen-ion Concentration in the Development of Mosquito Larvae. Parasitology, 13, 348–351 (Nov.).CrossRefGoogle Scholar
MacGregor, M. E. (1924). Report on the Anophelines of Mauritius, and on certain Aspects of Malaria in the Colony, ivith Recommendations for a New Anti-Malaria Campaign, 48 pp. 2 plates, 33 figs., 4 maps. London.Google Scholar
MacGregor, M. E. (1926). Some Effects of Electric Current on Mosquito Development. Bull. Ent. Res. 16, Pt 4 (March).CrossRefGoogle Scholar
Morishita, H. (1925). Experimental Observations on the Habits of Culex fatigans with special reference to the Influence of Hydrogen-ion concentration upon its Development. [In Japanese.] J. Med. Soc. Formosa, No. 247, 37 pp. Taihoku. (With summary in English.)Google Scholar
Nikitinshii, V. (1926). Life and Physico-chemical Regime of the Turf-pit and Conditions of Development of Anopheles maculipennis in it. [In Russian.] Russ. J. Trop. Med. 1926, pp. 13–15. Moscow.Google Scholar
Northrop, and Loeb, (1916). Nutrition and Evolution. J. Biol. Chem. 27, 309–312.Google Scholar
Paterson, N. F. (1925). The Effects of Changes of Hydrogen-ion Concentrations on Culicine Mosquito Larvae. S. Afric. J. Sci. 22, 311–317. Johannesburg (Nov.).Google Scholar
Rudolfs, W. (1925). The Food of Mosquito Larvae. Proc. 12th Ann. Meeting New Jersey Mosquito Extern. Assoc. Atlantic City, 1925, pp. 25–33. New Brunswick, N.J.Google Scholar
Russell, H. (1927). Notes on the Reaction of the Breeding-places of Anophelines in Macedonia. Bull. Ent. Res. 18, 155–8 (Dec.).CrossRefGoogle Scholar
Scharff, J. W. (1927). Notes on Practical Measures of Malaria Prevention from the Point of View of Mosquito Control. Malayan Med. J. 2, 49–56. Singapore (June).Google Scholar
Senior-White, R. (1926). Physical Factors in Mosquito Ecology. Bull. Ent. Res. 16, 187–248, 8 diagrams. (Jan.)CrossRefGoogle Scholar
Van Thiel, P. H. (1928). La nourriture des larves de l'Anopheles maculipennis en rapport avec le problème de l'existence de la variété atroparvus. Bull. Soc. Path. Exot. 21, No. 7.Google Scholar
Walton, C. L. and Wright, W. R. (1926). Hydrogen-ion Concentration and the Distribution of Limnaea truncatula and L. peregra, with a Note bearing on Mosquitoes. Parasitology, 18, 363–7 (Dec.).CrossRefGoogle Scholar
Williamson, K. B. (1924). Annual Report of the Malaria Bureau, Institute for Medical Research, Federated Malay States, for the Year 1924. F.M.S. Ann. Rep. Med. Dept. 1924, pp. 25–28. Kuala Lumpur.Google Scholar
Williamson, K. B. (1927). Malayan Med. J. ii, Pts 2 and 3.Google Scholar
Williamson, K. B. (1928). Mosquito Breeding and Malaria in Relation to the Nitrogen Cycle. Bull.Ent. Res. 18, Pt 4 (May).CrossRefGoogle Scholar
Young, C. J. (1926). Notes on the Bionomics of Stegomyia calopus Meigen in Brazil. Part I. Ann. Trop. Med. and Parasitol. 16, 389–406 (30 Dec.).CrossRefGoogle Scholar