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.
29
datasets available to search
ShareScore release 0.9.0
Dataset results
29 results for “adult sex ratio”
Causes and consequences of an unusually male-biased adult sex ratio in an unmanaged feral horse population
Open the record for dataset details and reuse information.
Data from: Replicated origin of female biased adult sex ratio in introduced populations of the Trinidadian guppy (Poecilia reticulata).
Open the record for dataset details and reuse information.
Data from: Variation in adult sex ratio alters the association between courtship, mating frequency and paternity in the lek-forming fruitfly Ceratitis capitata.
The intensity with which males deliver courtship and the frequency with which they mate are key components of male reproductive success. However, we expect the strength of the relationship between these traits and a male's overall paternity to be strongly context dependent, e.g. to be altered significantly by the extent of post-mating competition. We tested this prediction in a lekking insect, Ceratitis capitata (medfly). We examined the effect of manipulating the sex ratio from male- to female-biased (high and low male competition, respectively) on courtship behaviour, mating frequency and paternity of focal males. Under high male competition, focal males delivered significantly more courtship but gained lower paternity than under lower competition. Paternity was positively associated with mating frequency and small residual testes size. However, the association between mating frequency and paternity was significantly stronger under low competition. We conclude that manipulation of sex ratio significantly altered the predictors of mating success and paternity. The relationship between pre- and post-mating success is therefore plastic and alters according to the prevailing level of competition. The results highlight the importance of post-copulatory processes in lekking species and illuminate selection pressures placed on insects such as medflies that are mass reared for pest control.
Effects of biases in adult sex ratio and male body condition on the alternative reproductive tactics of a gift-giving spider
<p>This dataset contains raw data from the manuscript entitled "<span>Adult sex ratio and male body condition affect alternative reproductive tactics in a spider", from </span>Daniel Heimerl, Pavla Dudová, Karoline Wacker, Elisa Schenkel, Garance Despréaux, Cristina Tuni, accepted for publication in the journal Behavioral Ecology<span>, </span></p> <p>The study investigates how biases in adult sex ratios can affect mating tactics in a spider. Sex ratio variation can alter the intensity of sexual selection by enhancing competition for mates. Under intense competition males increase their investment in behaviors to outcompete rivals (e.g., fighting). Yet, given that in male-biased environments mating opportunities are rare males may alternatively reduce costly courtship and/or adopt alternative reproductive tactics (ARTs). Males of the spider <i>Pisaura mirabilis</i> adopt different mating tactics, offering females genuine nuptial gifts (prey), nutritionally worthless gifts (prey leftovers) or no gifts.</p> <p>To test whether behavioral shifts between gift tactics are triggered by changes in the competitive environment, we established replicate spider populations under natural conditions (field enclosures) at varying adult sex ratios (male-biased, female-biased and equal) and sampled gift tactics (no gift, genuine and worthless gifts) repeatedly over time. We additionally explored how male individual traits, such as body size and condition, affect the expression of ARTs.</p> <p>In male-biased populations males produced more gifts but of low quality, suggesting competition to trigger increased mating effort to ensure mate acquisition and fertilizations, but through a worthless gift tactic. Production of gifts and of genuine gifts was favored by high body condition, pointing to energetic limitations as being central for male reproductive capacity. We hence highlight two co-existing mechanisms at play to explain ARTs in this system, the competitive social environment where expression of gift tactics is based on optimal-decision making to overcome competition, and a conditional strategy linked to the individual's energetic state.</p>
Fig. 1 in Sex ratios in juveniles and adults of Dichroplus maculipennis (Blanchard) and Borellia bruneri (Rehn) (Orthoptera: Acrididae)
Fig. 1. (A), (B), (E)–(H) Dichroplus maculipennis. (A) Adult female. (B) Juvenile female. (E) and (F) Male external genitalia, dorsal (E) and lateral (F) views. (G) and (H) Juvenile female external genitalia, dorsal (G) and lateral (H) views. (C), (D), (I)–(L) Borellia bruneri. (C) Adult female. (D) Juvenile female. (I) and (J) Male external genitalia, dorsal (I) and lateral (J) views. (K) and (L) Juvenile female external genitalia, dorsal (K) and lateral (L) views.
Data from: Persistence of an extreme male-biased adult sex ratio in a natural population of polyandrous bird
In a number of insects, fishes and birds the conventional sex roles are reversed: males are the main care provider whereas females focus on matings. The reversal of typical sex roles is an evolutionary puzzle, because it challenges the foundations of sex roles, sexual selection and parental investment theory. Recent theoretical models predict that biased parental care may be a response to biased adult sex ratios (ASRs). However, estimating ASR is challenging in natural populations, because males and females often have different detectabilities. Here we use demographic modelling with field data from 2101 individuals, including 579 molecularly sexed offspring, to provide evidence that ASR is strongly male-biased in a polyandrous bird with male-biased care. The model predicts 6.1 times more adult males than females (ASR = 0.860, proportion of males) in the Kentish plover Charadrius alexandrinus. The extreme male-bias is consistent between years, and concordant with experimental results showing strongly biased mating opportunity toward females. Based on these results we conjecture that parental sex role reversal may occur in populations that exhibit extreme male-biased ASR.
Data from: Persistence of an extreme male-biased adult sex ratio in a natural population of polyandrous bird
Open the record for dataset details and reuse information.
Data from: Variation in adult sex ratio alters the association between courtship, mating frequency and paternity in the lek-forming fruitfly Ceratitis capitata.
Open the record for dataset details and reuse information.
Effects of biases in adult sex ratio and male body condition on the alternative reproductive tactics of a gift-giving spider
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.