Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
41
datasets available to search
ShareScore release 0.9.0
Dataset results
41 results for “egg number”
Fig. 52 in Eggs, Ovariole Numbers, and Modes of Parasitism of Cleptoparasitic Bees, with Emphasis on Neotropical Species (Hymenoptera: Apoidea)
Fig. 52. Comparison frequency distributions for oocyte size (egg index) of cleptoparasitic bees that secrete their eggs in open host cells (dark outline), of those that introduce their eggs into cells that have already been sealed by the host (hatched), and of noneusocial, nonparasitic bees (gray). For further details, see text.
Figs. 45–50 in Eggs, Ovariole Numbers, and Modes of Parasitism of Cleptoparasitic Bees, with Emphasis on Neotropical Species (Hymenoptera: Apoidea)
Figs. 45–50. SEM micrographs of mature oocyte of Mesoplia rufipes. 45. Anterior end, frontal view. 46. Closeup of micropylar area showing plumelike sculpturing below micropyle. 47. Closeup of micropyle; note some pores filled with follicular debris. 48. Posterior end of oocyte, lateral view. 49. Closeup of chorion toward posterior end. 50. Closeup of chorion near anterior end showing incised, polygonal pattern with one or two nodules per polygon.
Fig. 57 in Eggs, Ovariole Numbers, and Modes of Parasitism of Cleptoparasitic Bees, with Emphasis on Neotropical Species (Hymenoptera: Apoidea)
Fig. 57. Diagrams of mature oocyte of Coelioxys novomexicana, lateral and dorsal/ventral views, respectively; anterior ends toward the left; position of micropyle as noted.
Fig. 54 in Eggs, Ovariole Numbers, and Modes of Parasitism of Cleptoparasitic Bees, with Emphasis on Neotropical Species (Hymenoptera: Apoidea)
Fig. 54. Cladogram showing bee phylogeny upon which has been plotted the cleptoparasitic taxa that oviposit into nest cells that have not yet been closed by the host female (O) and the cleptoparasitic taxa that oviposit in nest cells that had been closed by the host female (•). Genera of cleptoparasites appear beneath the higher taxon to which they belong. If no generic name is listed beneath a cleptoparasitic taxon, all included genera are assumed to be cleptoparasitic with the same mode of parasitism. For discussion, see text. Cladogram modified from Engel (2001) and Michener (2000).
Figs. 55, 56 in Eggs, Ovariole Numbers, and Modes of Parasitism of Cleptoparasitic Bees, with Emphasis on Neotropical Species (Hymenoptera: Apoidea)
Figs. 55, 56. SEM micrographs of mature oocyte of Stelis elongativentris. 55. Anterior end, frontal view. 56. Closeup of micropyle.
Data from: Female investment in offspring size and number shifts seasonally in a lizard with single-egg clutches
The timing of reproduction strongly influences reproductive success in many organisms. For species with extended reproductive seasons, the quality of the environment may change throughout the season in ways that impact offspring survival, and, accordingly, aspects of reproductive strategies may shift to maximize fitness. Life-history theory predicts that if offspring environments deteriorate through the season, females should shift from producing more, smaller offspring early in the season to fewer, higher quality offspring later in the season. We leverage multiple iterations of anole breeding colonies, which control for temperature, moisture, and food availability, to identify seasonal changes in reproduction. These breeding colonies varied only by the capture date of the adult animals from the field. We show that seasonal cohorts exhibit variation in key reproductive traits such as inter-clutch interval, egg size and hatchling size consistent with seasonal shifts in reproductive effort. Overall, reproductive effort was highest early in the season due to a relatively high rate of egg production. Later season cohorts produced fewer, but larger offspring We infer that these results indicate a strategy for differential allocation of resources through the season. Females maximize offspring quantity when environments are favorable, and maximize offspring quality when environments are poor for those offspring. Our study also highlights that subtle differences in methodology (such as capture date of study animals) may influence the interpretation of results. Researchers interested in reproduction must be conscious of how their organism's reproductive patterns may shift through the season when designing experiments or comparing results across studies.
FIGURE 2 in Egg Number Varies With Population Density; A Study Of Three Oribatid Mite Species In Orchard Habitats In Egypt
FIGURE 2:: Average population densities of the three studied species as a function of sampling time. Means are given with their standard errors. For each vegetation type, means were taken over three different sites (cf. Fig. 1) and three replicate samples within a site.
FIGURE 1 in Egg Number Varies With Population Density; A Study Of Three Oribatid Mite Species In Orchard Habitats In Egypt
FIGURE 1: Map of Al-Gharbia Governate in Egypt, indicating the three sampling areas (Tanta, Al Mahalla Al Kobra and Kafr Al Zayat). The inset shows the location of Al-Gharbia in Egypt. In each area, three orchards were sampled four times in a year. The same three types of orchard were selected in each area. The distance between locations varies from 19 to 38 km; the distance between sites within one location is 1-2 km.
FIGURE 3 in Egg Number Varies With Population Density; A Study Of Three Oribatid Mite Species In Orchard Habitats In Egypt
FIGURE 3: Relationship between population density and fecundity of the three studied species. The data (pooled over three samples per site) are for all sites, vegetation types and seasons together.
Data from: Female investment in offspring size and number shifts seasonally in a lizard with single-egg clutches
Open the record for dataset details and reuse information.
Data from: Worker survival and egg production– but not transcriptional activity– respond to queen number in the highly polygynous, invasive ant Tapinoma magnum
Open the record for dataset details and reuse information.
Data from: Cooperative breeding favours maternal investment in size over number of eggs in spiders
The transition to cooperative breeding may alter maternal investment strategies depending on density of breeders, extent of reproductive skew and allo-maternal care. Change in optimal investment from solitary to cooperative breeding can be investigated by comparing social species with non-social congeners. We tested two hypotheses in a mainly semelparous system: that social, cooperative breeders, compared to subsocial, solitarily breeding congeners, 1) lay fewer and larger eggs because larger offspring compete better for limited resources and become reproducers; 2) induce egg size variation within clutches as a bet-hedging strategy to ensure that some offspring become reproducers. Within two spider genera, Anelosimus and Stegodyphus, we compared species from similar habitats and augmented the results with a mini-meta-analysis of egg numbers depicted in phylogenies. We found that social species indeed laid fewer, larger eggs than subsocials, while egg size variation was low overall, giving no support for bet-hedging. We propose that the transition to cooperative breeding selects for producing few, large offspring because reproductive skew and high density of breeders and young create competition for resources and reproduction. Convergent evolution has shaped maternal strategies similarly in phylogenetically distant species and directed cooperatively breeding spiders to invest in quality rather than quantity of offspring.
Sperm numbers on the perivitelline layers of blue tit eggs are repeatable within a clutch, but independent of the occurrence of extra-pair paternity
In many socially monogamous bird species, females produce offspring sired by males other than their social partner. A large body of research has aimed to elucidate the evolutionary causes and consequences of such extra-pair paternity, but relatively little is known about the underlying behaviour. The number of sperm on the egg's perivitelline layers (PVL) is related to recent copulation activity and may thus give some insight into the female's mating behaviour. We used a simple technique that allowed us to remove embryonic cells from the blastoderm for DNA extraction whilst keeping the PVL intact for sperm counts. Using 243 eggs from 99 blue tits (Cyanistes caeruleus), we show that PVL sperm numbers were repeatable within clutches (r = 0.40 [95% CI: 0.25-0.53]). However, neither overall sperm numbers, nor changes in sperm numbers across the laying sequence differed between clutches that contained extra-pair sired eggs and those that did not. Our results therefore provide no evidence that females with and without extra-pair young differ in their copulation activity.
Sperm numbers on the perivitelline layers of blue tit eggs are repeatable within a clutch, but independent of the occurrence of extra-pair paternity
Open the record for dataset details and reuse information.
Data from: Cooperative breeding favours maternal investment in size over number of eggs in spiders
Open the record for dataset details and reuse information.
Numbers of sperm associated with the perivitelline layer of seabird (and other bird species) eggs
<p>Following copulation, females of many seabird species spend a prolonged period of time away from the colony, building up reserves for egg formation and incubation. Here, we report that the number of sperm associated with eggs of single-egg clutch seabirds was almost an order of magnitude greater than predicted from the relationship between ovum size and sperm numbers in multi-egg clutch non-seabirds. Sperm numbers were also several times greater than the estimated number necessary for maximal fertilisation success. Our results are consistent with three unusual features of seabird reproduction: (1) single egg clutches, (2) prolonged sperm storage, and (3) a lag period between the end of yolk formation and ovulation. We hypothesise that sperm release from storage is under precise temporal control in these species, with high sperm numbers acting as an insurance against infertility in single-egg clutches. If true, the lag period may have evolved to provide sufficient time for sperm to be released simultaneously from storage and accumulate at the site of fertilization prior to ovulation.</p>
Figure S1. Different factors observed in the reproduction of S. hirundinacea in 2021 at TEBAR, including total numbers and numbers based on egg type laid.
Open the record for dataset details and reuse information.
Figs. 5–8 in Eggs, Ovariole Numbers, and Modes of Parasitism of Cleptoparasitic Bees, with Emphasis on Neotropical Species (Hymenoptera: Apoidea)
Figs. 5–8. SEM micrographs of mature oocytes of Kelita tuberculata. 5. Entire oocyte, lateral view, anterior end toward left. 6. Closeup of micropyle, lateral view. 7. Entire oocyte, dorsal view. 8. Closeup of micropyle, dorsal view.
Data from: Mother and offspring fitness in an insect with maternal care: phenotypic trade-offs between egg number, egg mass and egg care
Open the record for dataset details and reuse information.
Numbers of sperm associated with the perivitelline layer of seabird (and other bird species) eggs
Open the record for dataset details and reuse information.
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
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.
International Brain Laboratory public data
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.