The Effects of Partitions on the Growth Rates of Crowded Rana pipiens Tadpoles

John, Kenneth R.; Fenster, David

doi:10.2307/2424110

Cited by 41 publications

(27 citation statements)

References 8 publications

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“…Growth rates of amphibian larvae decline with crowding [67,[77][78][79], and in such cases the sigmoid growth curve assumes a righthand shift. Such density effects have been attributed to (i) interference competition [80,81], (ii) interference and exploitation compe tition [82], (iii) simple interaction [83], (iv) growth inhibitors [84][85][86] and (v) food limita tions [59,79,87], The right-hand shift of the sigmoid growth curve indicates that the initial density of the larvae functions as a negative modulator of growth kinetics. In other words, the growth of an individual larva is inhibited cooperatively by the remaining members of the group.…”

Section: Aquatic Growth Phase and Environmental Influencementioning

confidence: 99%

Growth in Amphibians

Hota¹

1994

Gerontology

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The complex life history of many amphibians has been designed to take advantage of the resources of two completely different habitats. The aquatic free-living amphibian larva is different from the terrestrial adult regarding morphology, physiology and behavioural patterns. Therefore, in the lifetime of an individual amphibian, two discontinuous growth stanzas are exhibited. The sigmoid growth model fits well with both stanzas. The rapid growth of the larval amphibian can be described by the double exponential Gompertz equation, whereas the slow growth process of the transformed amphibian can be described by the von Bertalanffy growth model. The bulk of amphibian growth occurs in the terrestrial phase and is not independent of size, age, sex and environmental conditions. The endocrine regulation of growth in amphibians is unique in the sense that the mechanism of pituitary action is different in aquatic and terrestrial phases.

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Section: Aquatic Growth Phase and Environmental Influencementioning

confidence: 99%

Growth in Amphibians

Hota¹

1994

Gerontology

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“…Competition mechanisms in tadpoles have been variously attributed to social interactions (Gromko, Mason & Smith-Gill 1973;John & Fenster 1975), food limitation (Savage 1952;DeBenedictis 1974;Seale 1980; Morin & Johnson 1988;Murray 1990), or water-borne growth-inhibitors (Richards 1958(Richards , 1962Rose 1960;Licht 1967;Steinwascher 1979a,b). Reports of growth inhibitors as mediators of competition in tadpoles are confined to laboratory studies where the density of tadpoles used is often artificially high.…”

Section: Introductionmentioning

confidence: 99%

Interspecific Competition in Tadpoles: Growth Inhibition and Growth Retrieval in Natterjack Toads, Bufo calamita

Griffiths¹,

Edgar²,

Wong³

1991

The Journal of Animal Ecology

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“…However, before food competition causes negative effects, it seems that "social stress" becomes decisive (Adolph, 1931;Alford and Crump, 1982). Gromko et al (1973) and John and Fenster (1975) assumed that behavioral interactions and their influence on the hormonal control of growth account for the crowding effect. For a wide spectrum of anurans, unfavorable growth conditions like an increased physical harshness (Warner et al 1991), a restriction in food supply (Hota and Dash, 1981;Semlitsch, 1987;Alford and Harris, 1988), or an increased population density (Dash and Hota, 1980;Pandian and Marian, 1985;Warner et aI., 1991) cause slower growth rates, a delay of metamorphosis, and a reduction in transformation size (Wilbur and Collins, 1973).…”

Section: Discussionmentioning

confidence: 99%

Life Cycle Strategies and Physiological Adjustments of Reedfrog Tadpoles (Amphibia, Anura, Hyperoliidae) in Relation to Environmental Conditions

Schmuck¹,

Geise²,

Linsenmair³

1994

Copeia

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The relationship between different degrees of intraspecific crowding of reedfrog tadpoles and their physiological responses to a deterioration of the natal pond water quality was examined under laboratory conditions. Tadpoles that were reared at a lower density metamorphosed significantly earlier than those raised at a higher density. As density increases, the average body length at metamorphosis decreases. However, at low tadpole density, a significantly higher diversity of body size classes among freshly metamorphosed froglets was observed than under more crowded conditions. Mortality increased during metamorphic climax and was inversely correlated with the tadpole density.In ephemeral ponds, an accumulation of nitrogenous wastes from metabolic processes and/or a concentration by evaporation in prolonged rainless periods can pose a considerable chemical stress to reedfrog tadpoles. Hyperolius viridiflavus ommatostictus responded to an increasing ammonia concentration with an activity increase of the ornithine cycle (intensified urea synthesis). hi contrast, Hyperolius marmoratus taeniatus exhibited a strong tolerance against high ammonia levels.A deterioration of the natal pond water quality caused H. v. ommatostictus and H. v. nitidulus tadpoles to adjust to harsher climatic conditions at the time of metamorphosis. This physiological preadjustment enabled the froglets to start feeding and growing immediately after metamorphosis even at low air humidity and rare precipitation events. In contrast, froglets that were raised in daily refreshed water exhibited high mortality rates if subjected to identical conditions. As one possible indicator of the actual climatic conditions prevailing in the surrounding terrestrial habitat, fluctuations in the water ammonia level are discussed.

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The Effects of Partitions on the Growth Rates of Crowded Rana pipiens Tadpoles

Cited by 41 publications

References 8 publications

Growth in Amphibians

Growth in Amphibians

Interspecific Competition in Tadpoles: Growth Inhibition and Growth Retrieval in Natterjack Toads, Bufo calamita

Life Cycle Strategies and Physiological Adjustments of Reedfrog Tadpoles (Amphibia, Anura, Hyperoliidae) in Relation to Environmental Conditions

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