Wachstumsmessungen an Sphodromantis bioculata Burm

Przibram, Hans

doi:10.1007/bf02189254

Cited by 8 publications

(8 citation statements)

References 6 publications

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“…The negative slope of the linear regression decreases with declining feeding level (see Table 2 for sample sizes). results show that growth in bridge spiders follows a regular geometric progression that we described as an exponential growth function (post-moult weight over instar), which would be consistent with Dyar's (1890) and Przibram and Megušar's (1912) widely accepted assumption that growth ratios of successive instars are constant. However, a more detailed analysis of growth ratios for successive instars revealed decreasing growth ratios with later moults.…”

Section: Growth Models For Bridge Spider Developmentsupporting

confidence: 88%

“…Here, we introduce the growth parameters developmental growth rate, growth coefficient, and intermoult ageing rate to compare entire growth trajectories for arthropods with varying instar numbers. The developmental growth rate F G describes body weight increases between moults; the postulated growth rate of 2.0 (Przibram & Megušar, 1912) was only found under low feeding conditions. Depending on feeding conditions, F G can be larger (high food) or lower (very low food) than 2.0.…”

Section: Growth Models For Bridge Spider Developmentmentioning

confidence: 99%

“…The idea of growth rules goes back to Dyar (1890) who proposed that arthropods grow with a regular geometrical progression; a pattern known as Dyar's rule. Later Przibram and Megušar (1912) and Cole (1980) determined growth ratios (i.e. the size of one instar divided by the size of the preceding instar) to be 1.26 based on linear size and 2.0 based on weight.…”

Section: Introductionmentioning

confidence: 99%

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Developmental strategies in an invasive spider: constraints and plasticity

Kleinteich

Schneider

2010

Ecological Entomology

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1. Growth defines the major life‐history traits such as size, weight, and age at maturity that determine an organism's fitness. Different models have been developed to describe growth by means of geometric progressions (e.g. Dyar's rule). However, growth forced along a geometric trajectory might constrain a plastic response to variable environmental conditions (e.g. food availability). 2. The present study investigated growth patterns under varying food conditions in the bridge spider, Larinioides sclopetarius, an extremely successful species in colonising urban habitats. 3. In L. sclopetarius growth ratios of successive instars were not constant but decreased over development. Instead, these spiders' growth is well described by a developmental growth rate (weight gain per moult) and a growth coefficient (weight gain per development time), both of which are based on a geometric progression. All developmental parameters, including developmental growth rate and growth coefficient as well as the intermoult duration and the number of instars, highly depend on food availability in L. sclopetarius and thus show plasticity. 4. Our study shows that geometric growth patterns do not necessarily preclude plasticity and that the parameters of geometric growth are affected by developmental plasticity. We suggest that their high developmental plasticity may facilitate bridge spiders' success in invading urban habitats.

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Section: Growth Models For Bridge Spider Developmentsupporting

confidence: 88%

Section: Growth Models For Bridge Spider Developmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Developmental strategies in an invasive spider: constraints and plasticity

Kleinteich

Schneider

2010

Ecological Entomology

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“…They report that the average of the mean length ratios in successive instars for the 74 structures measured is 1.286 for Ectobius Zapponicus and 1.250 for E. panzeri, again close to Przibram's Rule. Przibram's Rule is an extension of Dyar's Rule (Dyar, 1890) in that the latter refers to increments in linear dimensions of holometabolous insects, while the former relates increments in linear dimensions in successive instars of hemimetabolous insects to increments in weight (Przibram & MeguSar, 1912;Cole, 1980). If Przibram's Rule applies to male 2. rufipes, then the observation of Peckham & Peckham (1 889) may mean that the 'two forms of male' found in this species result from males maturing at two different instars.…”

Section: Introductionmentioning

confidence: 99%

Przibram's Rule and male body‐size dimorphism in Zygoballus rufipes (Araneae: Salticidae)

Faber

1994

Journal of Zoology

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Przibram's Rule of growth in hemimetabolous insects is derived from average values for the ratios of mean weights (2–09) and mean lengths (1–29) of successive instars in mantids. Adult males of the jumping spider Zygoballus rufipes Peckham & Peckham (Araneae, Salticidae) were shown to be dimorphic, while adult females were monomorphic. The male body weight distribution was bimodal, with two distinct body‐size classes (morphs). A method was developed for testing the null hypothesis that an observed ratio of two means is equivalent to a previously derived null ratio. The observed ratio of mean weights for the two male morphs of Z. rufipes (2–12) was not significantly different from the value for Przibram's Rule for weight (2–09), suggesting that males matured at two different instars. The body‐size dimorphism found in males was consistent with the existence of two size‐based alternative life‐history strategies.

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“…Dyar (as mentioned by Usinger, 1942) suggested that the sclerotized parts of the insect body increase in size in a more or less regular geometrical progression during successive instars, there being a growth factor for each species representing the increase in size at each moult. Przibram (Przibram and Megusar, 1912) has extended this principle and gives a theoretical progression factor of 1-26 (the cube root of 2) for insects in general.…”

Section: (B) Progrission In Growthmentioning

confidence: 99%

VARIATION IN THE ADULT AND IMMATURE STAGES OF NYSIUS HUTTONI WHITE (HETEROPTERA: LYGAEIDAE) WITH A NOTE ON THE VALIDITY OF THE GENUS BRACHYNYSIUS USINGER

Eyles¹

1960

Transactions of the Royal Entomological Society of London

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Wachstumsmessungen an Sphodromantis bioculata Burm

Cited by 8 publications

References 6 publications

Developmental strategies in an invasive spider: constraints and plasticity

Developmental strategies in an invasive spider: constraints and plasticity

Przibram's Rule and male body‐size dimorphism in Zygoballus rufipes (Araneae: Salticidae)

VARIATION IN THE ADULT AND IMMATURE STAGES OF NYSIUS HUTTONI WHITE (HETEROPTERA: LYGAEIDAE) WITH A NOTE ON THE VALIDITY OF THE GENUS BRACHYNYSIUS USINGER

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