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39 results for “male density”
Figure 1 in Effect of Pupal Holding Density on Emergence Rate, Flight Ability, and Yield of Sterile Male Mediterranean Fruit Flies (Diptera: Tephritidae)
Figure 1. Emergence rate (top) and flight ability (bottom) for Hawaii- and Guatemaladerived flies when held at loadings of 250, 350, or 450 ml per eclosion tower tray. Bar heights represent mean values over all trays for a given density (15 dates X 6 trays per loading amount per date = 90 trays total), and error bars represent 1 SE.
Figure 2 in Effect of Pupal Holding Density on Emergence Rate, Flight Ability, and Yield of Sterile Male Mediterranean Fruit Flies (Diptera: Tephritidae)
Figure 2. Estimated numbers of fliers produced per tower (top) and ratios of number of fliers produced to number of pupae placed per tower (bottom) in relation to the pupal loading level per constituent tray. Hawaii-derived flies were used exclusively; towers contained 52 trays. Symbols represent means over 33 towers per loading level (3 towers per test day x 11 test days); error bars represent ± 1 SE.
Data from: The effect of operational sex ratio and density on the strength of sexual selection against mutant males in Drosophila melanogaster
<p>Higher male:female operational sex ratio (OSR) is often assumed to lead to stronger sexual selection on males. Yet, this premise has been directly tested by very few studies, with mixed outcomes. We investigated how OSR affects the strength of sexual selection against two deleterious alleles, a natural <em>ebony</em> mutant and a transgenic <em>GFP</em> insertion, in <em>Drosophila melanogaster. </em>To this end, we estimated the relative paternity share of homozygous mutant males competing against wildtype males under different OSRs (1:2, 1:1, 2:1). We also manipulated the mating pool density (18, 36 or 54 individuals), and assessed paternity over three consecutive days, during which the nature of sexual interaction changed. The strength of sexual selection against the <em>ebony</em> mutant increased with OSR, became weaker after the first day and was little affected by density. In contrast, sexual selection against the <em>GFP</em> transgene was markedly affected by density: at the highest density it increased with OSR, but at lower densities it was strongest at 1:1 OSR, remaining strong throughout the experiment. Thus, while OSR can strongly affect the strength of sexual selection against "bad genes", it does not necessarily increase monotonically with male:female OSR. Furthermore, the pattern of relationship between OSR and the strength of sexual selection can be locus-specific, likely reflecting the specific phenotypic effects of the mutation.</p>
Local male breeding density affects extra‐pair paternity in a south temperate population of grass wrens Cistothorus platensis
<p>Demographic factors can affect the frequency of extra-pair paternity (EPP) in birds, as the distribution and availability of potential mates in both space and time influence the rate of encounters between females and males. Over three breeding seasons, we intensively studied the breeding system of a south temperate population of grass wrens <i>Cistothorus platensis</i> by genotyping 73 broods (319 nestlings) and estimating EPP rates for those broods. Using five different radii (80, 160, 240, 320, and 400 m) around each nest with assigned paternity, we examined the effects of local breeding synchrony, male breeding density, and adult sex ratio (ASR) on the EPP rate. The majority of extra-pair offspring (~80%) were sired by neighboring males. Neither local breeding synchrony nor ASR consistently explained the EPP rate variation as their effects were only statistically significant within 320 m and 400 m. However, the EPP rate increased as the local male breeding density increased within every radius category, strongly suggesting that neighboring male abundance might play an important role in the extra-pair mating behavior in this species. Our study also highlights the relevance of using a local scale approach when studying mating behavior.</p>
Table S1. Mean longevity of gamma-sterilized male Ae. aegypti post-treatment by density, temperature, and duration factors
<p>This Table descibe mean longevity of gamma-sterilized male <em>Ae</em>. <em>aegypti</em> post-treatment by density, temperature, and duration factors.</p>
Population density does not affect seasonal regulation of reproductive physiology in male water voles
<p>Most small rodent species display cyclic fluctuations in their population density. The mechanisms behind these cyclical variations are not yet clearly understood. Density-dependent effects on reproductive function could affect these population variations. The fossorial water vole ecotype, Arvicola terrestris, undergoes a multi-year cycle dynamic with outbreak peaks. Here, we monitored different water vole populations over three years, in spring and autumn, to evaluate whether population density be related to male reproductive physiology. Our results show an effect of season and inter-annual factors in testes mass, plasmatic testosterone level, and androgen-dependent seminal vesicles mass. By contrast, population density does not affect any of these parameters, thus suggesting a lack of modulation of population dynamics of population density.</p>
Data from: On the expression of male harm in <em>Drosophila melanogaster</em>: impacts of density and structural complexity of the mating environment
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Data from: The effect of operational sex ratio and density on the strength of sexual selection against mutant males in Drosophila melanogaster
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Local male breeding density affects extra‐pair paternity in a south temperate population of grass wrens Cistothorus platensis
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Population density does not affect seasonal regulation of reproductive physiology in male water voles
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Data and code for: Decline in offspring quantity but not quality from successive matings in male rainforest <em>Drosophila</em>, with no evidence for genetic divergence in male mating behaviour along climatic and density gradients
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Neuron soma size and density measurements in male and female adult rat nucleus accumbens shell, nucleus accumbens core, and caudate-putamen disaggregated by sex and estrous cycle phase
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Fragility fractures and bone mineral density in male patients affected by type 1 and type 2 myotonic dystrophy
<p>Abstract</p> <p>Myotonic dystrophy is a multisystemic disorder affecting skeletal muscle. Male patients have an increased risk of fractures and develop a number of endocrine/metabolic impairments known to adversely affect bone health. The aim of this study was primarily to determine the occurrence of fragility fractures and the bone mineralization status (lumbar spine, hip and total body by dual X-ray absorptiometry) in 36 male patients affected with type 1 myotonic dystrophy and 13 male patients affected with type 2 myotonic dystrophy. Fragility fractures occurred in 15 type 1 and 7 type 2 myotonic dystrophy in non-classical osteoporotic sites, such as metatarses. Hip osteopenia was the most frequent finding, particularly in type 2 (n = 6) than type 1 myotonic dystrophy patients (n = 1), while osteoporosis was rare. Patients with type 1 myotonic dystrophy presented higher total body bone mass density than patients with type 2 myotonic dystrophy and healthy controls and lumbar spine was associated positively with the severity of the disease. Gonadic failure, with low testosterone and reduced INSL3 levels, visceral adiposity and insulin resistance correlated with reduced body mass index in both type 1 and type 2 myotonic dystrophic patients. The independent determinant of fragility fractures were low total body mass index, low blood testosterone and low global muscle mass.</p>
Distribution. Now restricted to the Channel Country of SW Queensland and the Lake Eyre Basin in NE South Australia. Descriptive notes. Head-body 95-120 mm, tail 105-160 mm, ear 23-29 mm, hindfoot 32-37 mm; weight 30-50 g. The Fawn Hopping Mouse has body form typical of hopping mice, with very long hindfeet, long tail with distal brush of longer hairs, very long ears, and large protruberant eyes. Dorsal fur is of variable color, from pale pinkish fawn to gray; ventral fur white. Unlike most other hopping mice, it has no throat pouch, but males have a glandular area of naked skin on the chest. Habitat. Occurs in low shrublands and tussock grasslands on stony ("gibber") plains and claypans. Shows marked habitat segregation from the Dusky Hopping Mouse (N. fuscus), which is closely associated with sandy substrates. Food and Feeding. The Fawn Hopping Mouse is mostly granivorous, but also eats other plant material (stems, leaves) and occasionally invertebrates. It uses succulent, salt-adapted plants around edges of claypans as a source of water. Breeding. Reproduction is probably largely opportunistic and aseasonal, with high reproductive output from near-continuous breeding after periods of high rainfall; reported littersize is 1-5, most commonly three; gestation period 38-43 days for nonlactating females. Females may mature later than other hopping mice, with reproductive maturity reached at about six months. Activity patterns. Terrestrial and nocturnal. Fawn Hopping Mice shelter during day in burrow systems that are typically simpler and shallower than those of other hopping mice. Movements, Home range and Social organization. Fawn Hopping Mice generally live singly or in small groups; typically uncommon within range, but population density may increase by an order of magnitude following periods of high rainfall. Status and Conservation. Classified as Near Threatened on The IUCN Red List. The Fawn Hopping Mouse has shown marked decline in range (estimated at greater than 50%), and presumably population size, since European settlement of Australia. This is mostlikely due to predation by the introduced house cat and Red Fox (Vulpes vulpes), and to habitat degradation associated with pastoralism. Bibliography. Brazenor (1934), Burbidge et al. (2008), Finlayson (1939), Gould (1853), Jackson & Groves (2015), Murray et al. (1999), Ogilby (1892), Thomas (1921h), Van Dyck & Strahan (2008), Waite (1898), Watts & Aslin (1981), Woinarski et al. (2014), Wood Jones (1925). in Muridae
Distribution. Now restricted to the Channel Country of SW Queensland and the Lake Eyre Basin in NE South Australia. Descriptive notes. Head-body 95-120 mm, tail 105-160 mm, ear 23-29 mm, hindfoot 32-37 mm; weight 30-50 g. The Fawn Hopping Mouse has body form typical of hopping mice, with very long hindfeet, long tail with distal brush of longer hairs, very long ears, and large protruberant eyes. Dorsal fur is of variable color, from pale pinkish fawn to gray; ventral fur white. Unlike most other hopping mice, it has no throat pouch, but males have a glandular area of naked skin on the chest. Habitat. Occurs in low shrublands and tussock grasslands on stony ("gibber") plains and claypans. Shows marked habitat segregation from the Dusky Hopping Mouse (N. fuscus), which is closely associated with sandy substrates. Food and Feeding. The Fawn Hopping Mouse is mostly granivorous, but also eats other plant material (stems, leaves) and occasionally invertebrates. It uses succulent, salt-adapted plants around edges of claypans as a source of water. Breeding. Reproduction is probably largely opportunistic and aseasonal, with high reproductive output from near-continuous breeding after periods of high rainfall; reported littersize is 1-5, most commonly three; gestation period 38-43 days for nonlactating females. Females may mature later than other hopping mice, with reproductive maturity reached at about six months. Activity patterns. Terrestrial and nocturnal. Fawn Hopping Mice shelter during day in burrow systems that are typically simpler and shallower than those of other hopping mice. Movements, Home range and Social organization. Fawn Hopping Mice generally live singly or in small groups; typically uncommon within range, but population density may increase by an order of magnitude following periods of high rainfall. Status and Conservation. Classified as Near Threatened on The IUCN Red List. The Fawn Hopping Mouse has shown marked decline in range (estimated at greater than 50%), and presumably population size, since European settlement of Australia. This is mostlikely due to predation by the introduced house cat and Red Fox (Vulpes vulpes), and to habitat degradation associated with pastoralism. Bibliography. Brazenor (1934), Burbidge et al. (2008), Finlayson (1939), Gould (1853), Jackson & Groves (2015), Murray et al. (1999), Ogilby (1892), Thomas (1921h), Van Dyck & Strahan (2008), Waite (1898), Watts & Aslin (1981), Woinarski et al. (2014), Wood Jones (1925).
Fig. 3 in Effects of Female and Male Density on their Mating Performance and Female Post-Mating Reproductive Fitness in Plagiodera versicolora (Laicharting) (Coleoptera: Chrysomelidae)
Fig. 3. Effect of female and male density on female post-mating fecundity and the egg hatching rate. A–B) Female fecundity, C–D) Egg hatching rate. Different letters indicate significant differences from each other at P <0.05 (n = 29–40). The top and bottom of each box represent the upper and lower Quartiles, respectively; the horizontal line represents the median; the vertical lines extend to the minimum and maximum values within 1.5 times the inter-Quartile range.
Fig. 2 in Effects of Female and Male Density on their Mating Performance and Female Post-Mating Reproductive Fitness in Plagiodera versicolora (Laicharting) (Coleoptera: Chrysomelidae)
Fig. 2. Effect of female and male density on the female post-mating duration of the egg-laying period and longevity. A–B) Female longevity, C–D) Duration of egg laying. Different letters indicate significant differences from each other at P <0.05 (n = 29–40). The top and bottom of each box represent the upper and lower Quartiles, respectively; the horizontal line represents the median; the vertical lines extend to the minimum and maximum values within 1.5 times the inter-quartile range.
Fig. 1 in Effects of Female and Male Density on their Mating Performance and Female Post-Mating Reproductive Fitness in Plagiodera versicolora (Laicharting) (Coleoptera: Chrysomelidae)
Fig. 1. Effect of female and male density on time from pairing to successful mating and mating duration of Plagiodera versicolora. A–B) Time from pairing to successful mating, C–D) Mating duration. Different letters indicate significant differences from each other at P <0.05 (n = 30–41). The top and bottom of each box represent the upper and lower Quartiles, respectively; the horizontal line represents the median; the vertical lines extend to the minimum and maximum values within 1.5 times the inter-Quartile range.
Fig. 4 in Effects of Female and Male Density on their Mating Performance and Female Post-Mating Reproductive Fitness in Plagiodera versicolora (Laicharting) (Coleoptera: Chrysomelidae)
Fig. 4. Effect of female and male density on the female post-mating number of egg clutches and the number of eggs per clutch. A–B) Number of egg clutches, C–D) Number of eggs per clutch. Different letters indicate significant differences from each other at P <0.05 (n = 29–40). The top and bottom of each box represent the upper and lower Quartiles, respectively; the horizontal line represents the median; the vertical lines extend to the minimum and maximum values within 1.5 times the inter-Quartile range.
Fig. 3 in Effect of Group Density on the Physiology and Aggressive Behavior of Male Brandt's Voles (Lasiopodomys brandtii)
Fig. 3. Duration of male Brandt's voles (Lasiopodomys brandtii) engaging in aggressive behavior during a 30-min period in the three-voles and the five-voles groups. Error bars indicate standard error. Same letters indicate no significant differences between age groups at P <0.05 (n = 12).
Fig. 2 in Effect of Group Density on the Physiology and Aggressive Behavior of Male Brandt's Voles (Lasiopodomys brandtii)
Fig. 2. Concentration of corticosterone (CORT) (A) and testosterone (T) (B) in the serum of male Brandt's voles (Lasiopodomys brandtii) in the three-voles and the five-voles groups. Error bars indicate standard error. *indicates significant differences between two groups at P <0.05 (n = 6).
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
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The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.