Intrinsic Rate of Increase over Different Generation Time Intervals of Insect and Mite Species with Overlapping Generations

Abou-Setta, M. M.; Childers, Carl C.

doi:10.1093/aesa/84.5.517

Cited by 13 publications

(12 citation statements)

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“…Since these prey are adequate for both larval development and adult reproduction, one can calculate and compare rm values obtained on diets of various prey types. Abbou-Setta & Childers (1991) proposed a procedure for simple estimation of rm without the need to measure lifetime fecundity and showed that it provided accurate results for various species of Coleoptera. The only parameters required are generation time and an estimate of fecundity and fertilty over the same period.…”

Section: Indexing the Suitability Of Complete Preymentioning

confidence: 99%

On the assessment of prey suitability in aphidophagous Coccinellidae

Michaud¹

2005

Eur. J. Entomol.

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Abstract. Empirical protocols for assessing the suitability of prey for aphidophagous coccinellids are examined and a modified scheme of categorization is presented. It is argued that prey suitability should be assessed independently for larval development and adult reproduction because of potentially divergent nutritional requirements between these life stages. A scheme is proposed for assessing prey suitability for larval development using conspecific eggs as a reference diet against which diets of various prey types can be compared both within and among coccinellid species. Among suitable prey (those that support ca. 100% survival of larvae to the adult stage), those that promote faster development and yield larger adults relative to a conspecific egg diet are considered "optimal" for larvae. Prey that yield viable adults with similar or reduced adult weight after a similar or extended period of development relative to a diet of conspecific eggs are classified as "adequate". Prey are "marginal" if they support the survival of some larvae, but significantly less than 100%. Supplementary water should be provided with any non-aphid diet (e.g. pollen and alternative sources of animal protein) given the potential for food-specific diet-drought stress interactions. For adults, suitable prey are classified as "adequate" if they support the production of viable eggs when fed as a monotypic diet, or "marginal" if they merely prolong adult life relative to a water source. Prey that comprise an optimal or adequate diet for both larval development and adult reproduction are termed "complete" and these can be indexed for relative suitability according to derived estimates of rm. Potential sources of error in diet evaluation studies are identified and discussed.

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Section: Indexing the Suitability Of Complete Preymentioning

confidence: 99%

On the assessment of prey suitability in aphidophagous Coccinellidae

Michaud¹

2005

Eur. J. Entomol.

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“…Alternatively, it focusses on the peak of oviposition, a relatively short interval early in the oviposi tion period when daily egg production is at a maximum (see Sabelis & Janssen, 1994). Conversely, eggs depos ited later than 2G after emergence do not contribute sig nificantly to rm (Abou-Setta & Childers, 1991), and hence rm can be estimated from information at G and 2G.…”

Section: Integrating Informationmentioning

confidence: 99%

Measuring and reporting life-cycle duration in insects and arachnids

Danks¹

2000

Eur. J. Entomol.

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Abstract. Some previous work on arthropod development is insufficiently detailed or incompletely reported. Much of the published information in this area is of limited use for the general analysis of life cycles. These difficulties arise primarily because many experiments do not control fully for the strain of the material (and even its specific identity) nor for rearing conditions, do not ade quately take account of the complexity of life cycles and their stages, or are restricted to only part of the life cycle. For example, 285 such factors as variable numbers of instars, sexual differences, abbreviated or hidden stages and dormancies may mean that the "average durations" reported apply to an unknown mixture of developmental types. Nor are experiments always designed or results reported and analysed in a logical and transparent manner. Undefined terms may obscure what actual developmental intervals were measured. Highly derived developmental or demographic measures may obscure core data. Statistical information may be inade quate. Such pitfalls are reviewed here, suggesting ways to ensure that results on the duration of development are both valid for spe cific studies and more widely useful. General experimental difficulties, recommended background information that should be provided, recommended life-cycle intervals and their terminology, and recommended ways to report numerical and statistical infor mation are briefly summarized in tabular form.

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“…It should be noted that the methods specifically apply to predatory mites, but probably also to organisms with similar life histories (e.g., spider mites and insects with comparable generation times). The first method reviewed is that of Abou-Setta and Childers (1991), and its precision is not impressive.…”

Section: Discussionmentioning

confidence: 99%

“…Estimating r m for part of the reproductive period Abou-Setta and Childers (1991) proposed to measure survival and oviposition of insect and mite species in time steps of a generation interval (G, Fig. 2).…”

Section: Methods For Estimating R M From Partial Life Tablesmentioning

confidence: 99%

Estimating intrinsic growth rates of arthropods from partial life tables using predatory mites as examples

et al. 2022

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The intrinsic rate of natural increase of a population (rm) has been in focus as a key parameter in entomology and acarology. It is considered especially important in studies of predators that are potential biological control agents of fast-growing pests such as mites, whiteflies and thrips. Life-table experiments under controlled laboratory conditions are standard procedures to estimate rm. However, such experiments are often time consuming and may critically depend on the precise assessment of the developmental time and the fecundity rate early in the reproductive phase. Using selected studies of predatory mites with suitable life-table data, we investigated whether and how measurements of growth rates can be simplified. We propose a new method for estimating rm from partial life tables, in which the researcher can choose a level of precision based on a stand-in measure of relative error. Based on this choice, the procedure helps the researcher to decide when a life-table experiment can be terminated. Depending on the chosen precision, significant amounts of experimental time can be saved without seriously compromising the reliability of the estimated growth parameter.

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Intrinsic Rate of Increase over Different Generation Time Intervals of Insect and Mite Species with Overlapping Generations

Cited by 13 publications

References 0 publications

On the assessment of prey suitability in aphidophagous Coccinellidae

On the assessment of prey suitability in aphidophagous Coccinellidae

Measuring and reporting life-cycle duration in insects and arachnids

Estimating intrinsic growth rates of arthropods from partial life tables using predatory mites as examples

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