Hydropy and ultrastructure of egg envelopes in Aleochara bilineata (Coleoptera, Staphylinidae)

Gauvin, Marie‐Josée; Boivin, Guy; Nénon, Jean‐Pierre

doi:10.1007/s004350000033

Cited by 5 publications

(6 citation statements)

References 15 publications

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“…After counting, pictures of oocytes from each female were immediately taken with a microscope (200× magnification) and the software Image‐Pro ® Plus 5.1. The length (L) and width (W) were measured to estimate the volume (V) of each oocyte by the equation describing the volume of an ellipsoid V = π(W 2 *L)/6 (Gauvin et al., 2001). The volume of up to 10 oocytes was measured for each female (62 females) to estimate the mean oocyte volume.…”

Section: Methodsmentioning

confidence: 99%

Gamete number and size correlate with adult size in the egg parasitoid Trichogramma euproctidis

Durocher-Granger¹,

Martel²,

Boivin³

2011

Entomologia Experimentalis Et Applicata

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International audienceIn parasitoids, the size of the adult is influenced by the size and quality of the host in which it develops. Body size is generally positively correlated with several adult fitness proxies (fecundity, longevity, and mating capacity). The initial resources available to an individual can influence gamete production (sperm and oocytes), and the number and quality of gametes produced directly influence the expected fitness of both males and females. Gamete production in relation to adult body size was quantified in Trichogramma euproctidis (Girault) (Hymenoptera: Trichogrammatidae), a short-lived egg parasitoid of lepidopteran species. To avoid host quality variation, male and female parasitoids of different body sizes were produced using superparasitism by allowing mated and virgin female parasitoids to oviposit on Trichoplusia ni Hu¨bner (Lepidoptera: Noctuidae) eggs. Seminal vesicles and ovaries of their offspring were dissected to count oocytes and to measure sperm length and oocytes volume. Tibia length was also measured to estimate body size. The number of oocytes, volume of oocytes, maternal investment index [= (number of oocytes * mean volume of oocytes) ⁄ 10 000] and sperm length were all significantly positively correlated to body size. These results show that initial resources acquired during larval stage induce phenotypic plasticity in gamete production in both male and female T. euproctidis. Whereas number of sperm and oocytes can influence the fitness of males and females through increased mating capacity and fecundity, variation in gamete size (sperm length and oocyte volume) could also affect the fitness of an individual through sperm and larval competition

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Section: Methodsmentioning

confidence: 99%

Gamete number and size correlate with adult size in the egg parasitoid Trichogramma euproctidis

Durocher-Granger¹,

Martel²,

Boivin³

2011

Entomologia Experimentalis Et Applicata

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“…Eggs were treated as prolate spheroids, i.e., tridimensional ellipsis with polar axis diameter higher than the equatorial axis one (Supplementary File 1), as previously considered for mosquito (Sota and Mogi, 1992) and beetle (Gauvin et al, 2001) eggs. Equation of the prolate spheroid surface area is 2Ápa 2 Á(1 + b/aeÁsin À1 Áe), where ''a" is half the egg width, ''b" is half the egg length and ''e" is the eccentricity of the spheroid, calculated through the formulae: e 2 = 1 À a 2 /b 2 .…”

Section: Measurement Of Egg Length Width Area and Volumementioning

confidence: 99%

Physical features and chitin content of eggs from the mosquito vectors Aedes aegypti, Anopheles aquasalis and Culex quinquefasciatus: Connection with distinct levels of resistance to desiccation

Farnesi

Menna-Barreto

Martins

et al. 2015

Journal of Insect Physiology

102

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Mosquito eggs are laid in water but freshly laid eggs are susceptible to dehydration, if their surroundings dry out at the first hours of development. During embryogenesis of different mosquito vectors the serosal cuticle, an extracellular matrix, is produced; it wraps the whole embryo and becomes part of the eggshell. This cuticle is an essential component of the egg resistance to desiccation (ERD). However, ERD is variable among species, sustaining egg viability for different periods of time. While Aedes aegypti eggs can survive for months in a dry environment (high ERD), those of Anopheles aquasalis and Culex quinquefasciatus in the same condition last, respectively, for one day (medium ERD) or a few hours (low ERD). Resistance to desiccation is determined by the rate of water loss, dehydration tolerance and total amount of water of a given organism. The ERD variability observed among mosquitoes probably derives from diverse traits. We quantified several attributes of whole eggs, potentially correlated with the rate of water loss: length, width, area, volume, area/volume ratio and weight. In addition, some eggshell aspects were also evaluated, such as absolute and relative weight, weight/area relationship (herein called surface density) and chitin content. Presence of chitin specifically in the serosal cuticle as well as aspects of endochorion external surface were also investigated. Three features could be related to differences on ERD levels: chitin content, directly related to ERD, the increase in the egg volume during embryogenesis and the eggshell surface density, which were both inversely related to ERD. Although data suggest that the amount of chitin in the eggshell is relevant for egg impermeability, the participation of other yet unidentified eggshell attributes must be considered in order to account for the differences in the ERD levels observed among Ae. aegypti, An. aquasalis and Cx. quinquefasciatus.

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“…Egg length ( a ) and width ( b ) were measured under stereomicroscope equipped with Elements 3.0 software (Nikon SMZ-800, www.nikon.com ). The surface area ( S ) of these ellipsoid eggs was calculated as S = 4π ab ; the volume ( V ) was calculated as V = (1/6)π ab 2 ( Gauvin et al. 2001 ).…”

Section: Methodsmentioning

confidence: 99%

“…Micropyle, aeropyle, water vapor uptake, and cold tolerance of eggs had been studied ( Yoder and Denlinger 1992 , Cônsoli et al. 1999 , Gauvin et al. 2001 , Shintani and Ishikawa 2007 , Sukontason et al.…”

mentioning

confidence: 99%

Adaptation of the Egg of the Desert Beetle, Microdera punctipennis (Coleoptera: Tenebrionidae), to Arid Environment

Wang

Shi

Hou

et al. 2014

Journal of Insect Science

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Microdera punctipennis Kaszab (Coleoptera: Tenebrionidae) is an endemic species in Guerbantonggut desert in China. To explore the ways that M. punctipennis egg adapts to dry desert environment, morphological characteristics of the egg was investigated along with the egg of the nondesert beetle Tenebrio molitor (Coleoptera: Tenebrionidae). Water loss rate and survival rate of these eggs under different dry treatments (relative humidity0, 10, and 20%) were measured to evaluate the desiccation resistance of the eggs at different developmental stages (day 0, 2, and 5 eggs). Our results showed that the 50-egg weight in T. molitor was heavier than M. punctipennis , while the 50-first-instar larva weight in T. molitor was almost the same as in M. punctipennis . The water loss rate of M. punctipennis egg under dry conditions was significantly lower than T. molitor , and the egg survival rate was significantly higher than T. molitor . The estimated developmental threshold temperature of M. punctipennis egg was 18.30°C, and the critical thermal maximum of M. punctipennis egg is above 39°C. These features partly account for the adaptability of M. punctipennis to desert environment in egg stage.

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Hydropy and ultrastructure of egg envelopes in Aleochara bilineata (Coleoptera, Staphylinidae)

Cited by 5 publications

References 15 publications

Gamete number and size correlate with adult size in the egg parasitoid Trichogramma euproctidis

Gamete number and size correlate with adult size in the egg parasitoid Trichogramma euproctidis

Physical features and chitin content of eggs from the mosquito vectors Aedes aegypti, Anopheles aquasalis and Culex quinquefasciatus: Connection with distinct levels of resistance to desiccation

Adaptation of the Egg of the Desert Beetle, Microdera punctipennis (Coleoptera: Tenebrionidae), to Arid Environment

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