The Intrinsic Rate of Natural Increase of an Insect Population

Birch, L. C.

doi:10.2307/1605

Cited by 2,169 publications

(1,425 citation statements)

References 23 publications

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“…Parameter c for G. occidentalis at 15°C was constrained to be equal to or greater than zero because the unconstrained model estimate was otherwise negative. We constructed fertility life tables (Birch 1948) for the three mite species and estimated demographic parameters in SAS/STAT 9.1 using the program developed by Maia et al (2000). The demographic parameters estimated were net reproductive rate (Ro), intrinsic rate of increase (r m ), mean generation time (T), and doubling time (Dt).…”

Section: Statistical Analysesmentioning

confidence: 99%

Influence of temperature on the reproductive and demographic parameters of two spider mite pests of vineyards and their natural predator

Stavrinides

Mills

2010

BioControl

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We evaluated the influence of temperature on demographic parameters of two common vineyard pests, the Pacific spider mite, Tetranychus pacificus McGregor, and the Willamette spider mite, Eotetranychus willamettei (McGregor) (Acari: Tetranychidae). Additionally, we investigated the effects o f temperature on their shared predator, the western predatory mite, Galendromus occidentalis (Nesbitt) (Acari: Phytoseiidae). The intrinsic rate of increase (r m ) was higher for T. pacificus than E. willamettei at 15 and 28°C, but similar at 22°C. G. occidentalis achieved a higher r m than T. pacificus from 15 to 28°C, but the difference was significant only at 22°C. At 34°C, the r m for both T. pacificus and G. occidentalis was negative, while E. willamettei did not develop at this temperature. Prey species did not affect demographic parameters of G. occidentalis. These results suggest that higher temperatures favor T. pacificus over the less damaging E. willamettei, and may also reduce the effectiveness of G. occidentalis.

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Section: Statistical Analysesmentioning

confidence: 99%

Influence of temperature on the reproductive and demographic parameters of two spider mite pests of vineyards and their natural predator

Stavrinides

Mills

2010

BioControl

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“…The calculation of r basing upon Lotka's formula Jelmzdx= 1 has been discussed in Birch (1948), Birch, Dobzhansky, Elliott and Lewontin (1963) and Dobzhansky, Lewonti and Pavlovsky (1964). The formula used to calculate ri,, in this study was:…”

Section: Materials and Techniquesmentioning

confidence: 99%

Chromosomal polymorphism and capacity for increase under near optimal conditions

Ohba

1967

Heredity

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“…Para a elaboração da tabela de vida de fertilidade, os parâmetros foram calculados baseando-se em Birch (1948). Os dados foram processados via SAS (SAS Institute 1999-2001, adaptando o modelo descrito por Maia et al (2000), o qual utiliza o método "Jackknife" para estimar intervalos de confi ança das médias dos tratamentos e permite comparações entre pares de tratamentos empregando-se o teste t.…”

Section: Methodsunclassified

Biologia de Tetranychus mexicanus (McGregor) (Acari: Tetranychidae) em três espécies de Annonaceae

Sousa¹,

Gondim²,

Lofego³

2010

Neotrop. entomol.

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-The mite Tetranychus mexicanus (McGregor) is considered a pest of a variety of plant species in the Americas. Although this mite apparently causes economic damage to Annonaceae, little is known about its biology. Here we studied the biology of T. mexicanus on soursop (Annona muricata), sweetsop (Annona squamosa) and araticum (Annona coriaceae). The fi rst two species are the most important economical Annonaceae species in northeast Brazil; araticum is commonly found in the region, but not commercially explored. The mites were collected in the fi eld from leaves of A. muricata and maintained in the laboratory for six months on detached leaves of A. muricata, A. squamosa and A. coriaceae, respectively, before observations started. Tetranychus mexicanus developed more slowly on A. squamosa than on the two other hosts, but oviposition was considerably lower on A. coriaceae. As indicated by the calculated life table parameters, biotic potential was higher on A. muricata than on the other hosts. Despite the observed differences in the T. mexicanus biology on the different evaluated hosts, development and reproduction were satisfactory in all of the hosts used.

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The Intrinsic Rate of Natural Increase of an Insect Population

Cited by 2,169 publications

References 23 publications

Influence of temperature on the reproductive and demographic parameters of two spider mite pests of vineyards and their natural predator

Influence of temperature on the reproductive and demographic parameters of two spider mite pests of vineyards and their natural predator

Chromosomal polymorphism and capacity for increase under near optimal conditions

Biologia de Tetranychus mexicanus (McGregor) (Acari: Tetranychidae) em três espécies de Annonaceae

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