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295 results for “Fecundity”
Fig. 4 in Dependence of daily oviposition activity and total fecundity on body mass in the house cricket Acheta domesticus (L.) (Insecta: Orthoptera)
Fig. 4: Total fecundity (mean + sd) measured for female crickets belonging to mass category (MC) 1, 2, and 3. Asterisks indicate highly significant differences between adjacent mean values (p <0.001).
Fig. 3 in Dependence of daily oviposition activity and total fecundity on body mass in the house cricket Acheta domesticus (L.) (Insecta: Orthoptera)
Fig. 3: Temporal course of daily fecundity (mean + sd) in Acheta domesticus and its dependence on body mass. Three mass categories (MC) have been distinguished: MC1 ‒ 600-800 mg, MC2 ‒ 801- 100 mg, MC3 ‒ 1001-1200 mg; (a) 1st to 7th day of oviposition period; (b) 8th to 14th day; (c) 15th to 21st day, (d) 22nd to 28th day, (e) 29th to 35th day. Between most adjacent values significant differences (p <0.05) could be determined.
Fig. 2 in Dependence of daily oviposition activity and total fecundity on body mass in the house cricket Acheta domesticus (L.) (Insecta: Orthoptera)
Fig. 2: Equipment for the culture of the house cricket Acheta domesticus: (a) climate chamber with plastic boxes containing cricket nymphs, (b) glass vessels containing adults separated by gender, (c) small oviposition vessels for the investigation of daily fecundity.
Fig. 2 in Reproductive period, fecundity and histology of gonads of two cheirodontines (Ostariophysi: Characidae) with different reproductive strategies - insemination and external fertilization
Fig. 2. Scanning Electron Micrography of an oocyte of Compsura heterura from an ovary critical-point dried and crushed with a needle on a stub, showing the spermatozoa observed over an oocyte (a), and an amplified image of these spermatozoa (b).
Fig. 6 in Reproductive period, fecundity and histology of gonads of two cheirodontines (Ostariophysi: Characidae) with different reproductive strategies - insemination and external fertilization
Fig. 6. Distribution of the absolute frequencies of the standard lengths of females of Odontostilbe pequira in the first (September/October) and second (January/February) reproductive periods.
Fig. 1 in Reproductive period, fecundity and histology of gonads of two cheirodontines (Ostariophysi: Characidae) with different reproductive strategies - insemination and external fertilization
Fig. 1. Histology of ovaries of Compsura heterura at different stages of maturation: maturing (a, b), mature (c, d) and semispent (e, f). Black arrow - follicular cells, EZ and white arrow - spermatozoa, FV - post-ovulatory follicles, M - micropile, N - nucleus, NU - nucleolus, OR - early primary growth oocytes, PV - Previtellogenic oocytes, V - vitellogenic oocyte, ZR - radiate zone. Magnification 10x (a, e), 20x (b, c), 100x (d, f).
Fig. 3 in Reproductive period, fecundity and histology of gonads of two cheirodontines (Ostariophysi: Characidae) with different reproductive strategies - insemination and external fertilization
Fig. 3. Histology of testis of Compsura heterura (a, c, d) and Odontostilbe pequira (b) at different stages of maturation: immature (a), maturing (b, c, d) mature (e, f). Arrow - cell division, C - spermatocytes, C1 - primary spermatogonia, C2 - secondary spermatogonia, ET - spermatids, EZ - spermatozoa, G - spermatogonia. Magnification 40x (a, c), 100x (b, d), 20x (e, f).
Fig. 7 in Reproductive period, fecundity and histology of gonads of two cheirodontines (Ostariophysi: Characidae) with different reproductive strategies - insemination and external fertilization
Fig. 7. Relation between absolute fecundity and standard length of females of Compsura heterura (a), from rio Ceará- Mirim, RN, and of Odontostilbe pequira (b) from rio Ibicuí- Mirim, RS.
Data for: Brood parasitism of Hooded Warblers by Brown-headed Cowbirds: Severe impact on individual nests but modest consequences for seasonal fecundity and conservation
<div> <div> <div> <div> <p>Brood parasitism by Brown-headed Cowbirds (<em>Molothrus ater</em>) often has pronounced negative effects on host nests. However, the extent to which parasitism reduces annual reproduction and presents conservation challenges for host species is unclear. We address this issue with data from a color-banded population of Hooded Warblers (<em>Setophaga citrina</em>) in Pennsylvania, where Hooded Warblers have increased dramatically despite frequent nest parasitism. Our analysis is based on both an extensive dataset (8 years, 847 nests) on the per-nest impacts of cowbird parasitism, and female-based stochastic simulations that accurately reflect the reproductive biology and parasitism rate (30%) of our study population. Cowbird parasitism has multiple negative consequences for Hooded Warbler nests, including: (1) reduced host clutch size, (2) increased nest abandonment, (3) increased risk of complete failure due to predation, and (4) in surviving nests increased egg loss, hatching failure, and nestling mortality. We estimate that parasitism reduces success of Hooded Warbler nests 68%, from 1.29 to 0.41 fledglings per nest. For females and populations, however, the consequences of nest parasitism are considerably less extreme; female annual fecundity decreases 25% for each nesting attempt parasitized, and population-level fecundity drops 5.6% for each 10% increase in the frequency of parasitism. These more modest impacts are attributable to: (1) steep declines in rates of cowbird parasitism as the nesting season progresses, (2) rapid re-nesting following abandonment or failure of parasitized nests, and (3) regular double brooding, with second broods initiated in late June and July when the incidence of cowbird parasitism is low. Our results help resolve the paradox of how cowbird parasitism can have both severe consequences for individual host nests but more modest and sustainable conservation impacts on the seasonal fecundity of females and populations. They further underscore the importance of determining population-level effects of brood parasites before investing in costly management efforts.</p> </div> </div> </div> </div>
Effects of mycotoxin treatment on fly survival, development time, thorax length, fecundity, and longevity in four mycophagous Drosophila species
<p>Many mycophagous Drosophila species have adapted to tolerate high concentrations of mycotoxins, an ability not reported in any other eukaryotes. Although an association between mycophagy and mycotoxin tolerance has been established in many Drosophila species, the genetic mechanisms of the tolerance are unknown. This study presents the inter- and intraspecific variation in the mycotoxin tolerance trait. We studied the mycotoxin tolerance in four Drosophila species from four separate clades within the immigrans-tripunctata radiation from two distinct locations. The effect of mycotoxin treatment on 20 isofemale lines per species was studied using seven gross phenotypes: survival to pupation, survival to eclosion, development time to pupation and eclosion, thorax length, fecundity, and longevity. We observed interspecific variation among four species, with D. falleni being the most tolerant, followed by D. recens, D. neotestacea, and D. tripunctata, in that order. The results also revealed geographical variation and intraspecific genetic variation in mycotoxin tolerance. This report provides the foundation for further delineating the genetic mechanisms of the mycotoxin tolerance trait.</p>
Data from: Insights from a 31-year study demonstrate an inverse correlation between recreational activities and red deer fecundity, with body weight as a mediator
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Data from: Trait-fitness associations via fecundity and competition in a two-million-year-long fossil record
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Data belonging to the article: Estimating pre-harvest density, adult sex ratio and fecundity of white-tailed deer using wildlife cameras
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Data and code for: A supergene controlling social structure in Alpine ants also affects the dispersal ability and fecundity of each sex
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Evolution of size-fecundity relationship in medaka fish from different latitudes
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Selection for male weapons boosts female fecundity, eliminating sexual conflict in the bulb mite
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Data for: Brood parasitism of Hooded Warblers by Brown-headed Cowbirds: Severe impact on individual nests but modest consequences for seasonal fecundity and conservation
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Effects of mycotoxin treatment on fly survival, development time, thorax length, fecundity, and longevity in four mycophagous Drosophila species
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UCSB SONGS Mitigation Monitoring: Reef Survey - Fish Fecundity, Feeding, and Somatic Growth
These data describe annual estimates of the fecundity, gut fullness, and somatic growth of five fish species at three subtidal reefs collected as part of the San Onofre Nuclear Generating Station (SONGS) Mitigation Monitoring Program. Data collection began in 2009 at an artificial reef (Wheeler North Reef in Orange County, CA) and two natural reference reefs (San Mateo Kelp in Orange County, CA and Barn Kelp in San Diego County, CA). Fish were collected annually at each reef between May and October.
Trade-offs between seed size and biotic interactions contribute to coexistence of co-occurring species that vary in fecundity
<p>Despite theoretical advances, the ecological factors and functional traits that enable species varying in seed size and fecundity to coexist remain unclear. Given inherent fecundity advantages, why don't small-seeded species dominate communities?</p> <p>In perennial grasslands, we evaluated whether small-seeded species are less tolerant of competition from the community dominant bunchgrass than large-seeded species but also less vulnerable to seed predation by mice. We also explored whether trade-offs involving competitive tolerance include two other functional traits, height and leaf mass per area (LMA). We added seeds of 17 forb species to plots where bunchgrass competition and rodent seed predation were manipulated across sites varying in bunchgrass productivity and thus competitive intensity. Seeds were added at densities mimicking interspecific variation in fecundity among target species.</p> <p>Standardizing for differences in fecundity (i.e. seed input; which enabled us to evaluate inherent interspecific differences in susceptibility to biotic interactions), bunchgrass competition more greatly reduced recruitment and establishment of small vs. large-seeded species, whereas rodent seed predation more greatly reduced the recruitment of large- versus small-seeded species. Plant height and LMA were unrelated to the competition effect size.</p> <p>Small-seeded species abundance decreased across sites increasing in bunchgrass productivity, whereas this was not the case for large-seeded species. For adult plants but not seedlings, community weighted functional trait means (CWM) for seed size, height, and LMA increased in plots with versus without bunchgrass competition and the CWM for seed size and height also increased at sites with greater bunchgrass productivity (for adults only). In contrast, rodent seed predation had no significant effects on CWM seed size.</p> <p>At the end of the experiment, adult abundance positively correlated with plant fecundity in plots lacking bunchgrass, indicating the inherent advantages accrued to high fecundity small-seeded species. However, with bunchgrass competition, abundances were equalized across species due to reduced competitive tolerance of high fecundity small-seeded species.</p> <p>Synthesis: Our results suggest that coexistence among subordinate forb species varying in seed size and fecundity is in-part due to a trade-off involving competitive tolerance and fecundity, mediated by seed size and associated functional traits.</p>
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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)
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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.