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462 results for “investment”
Failure to mate enhances investment in behaviors that may promote mating reward and impairs the ability to cope with stressors via a subpopulation of Neuropeptide F receptor neurons
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Age predicts risky investment better than residual reproductive value
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Fighting investment of Neolamprologus pulcher after receiving single, reinforcing, and contradictory contest experiences
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Data from: Genetic variation in reproductive investment across an Ephemerality gradient in Daphnia pulex
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Seeds of success: a conservation and restoration investment in the future of US lands
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Elevated temperature increases reproductive investment in less preferred mates in the invasive European corn borer moth
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Data from: Patterns of annual and seasonal immune investment in a temporal reproductive opportunist
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Evolutionary consequences of pesticide exposure include transgenerational plasticity and potential terminal investment transgenerational effects
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Wolbachia-infected ant colonies have increased reproductive investment and an accelerated life cycle
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Maternal investment and early thermal conditions affect performance and antipredator responses
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Effects of inbreeding and elevated rearing temperatures on strategic sperm investment
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Data from: Effects of female-specific selection for reproductive investment on male fertility traits
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Data from: breeding under pressure: corticosterone is associated with reproductive investment under fluctuating predation risk in a long-lived sea duck
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The super-rich and cropland expansion via direct investments in agriculture
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Raw data from: Dysregulation of host-control causes interspecific conflict over host investment into symbiotic organs
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Data from: Modification of reproductive schedule in response to pathogen exposure in a wild insect: support for the terminal investment hypothesis
<p>Trade-offs in the time and energy allocated to different functions, such as reproductive activities, can be driven by alterations in condition which reduce resources, often in response to extrinsic factors such as pathogens or parasites. When individuals are challenged by a pathogen they may either reduce reproduction as a cost of increasing defence mechanisms, or alternatively, modify reproductive activities so as to increase fecundity thereby minimizing the fitness costs of earlier death, a behaviour consistent with the terminal investment hypothesis (TIH). The TIH predicts that individuals with decreased likelihood of future reproduction will maximize current reproductive effort, which may include shifts in reproductive timing. We examined how wild, adult female click beetles <i>(Agriotes obscurus) </i>responded after exposure to the fungal pathogen<i>Metarhizium brunneum</i>. Field-collected beetles exposed to a high concentration of <i>M. brunneum </i>died earlier and in greater numbers than those exposed to a low concentration. Using a multi-variate approach we examined the impact of pathogen challenge on lifespan and a suite of reproductive traits. Stepdown regression analysis showed that only female lifespan differed among the fungal treatments. Fungal-induced reductions in lifespan drove changes in the reproductive schedule, characterized by a decrease in preoviposition period. Moving the start of egg laying forward allowed the females to offset the costs of a shortened lifespan. These changes suggest that there is a threshold for terminal investment which is dependent on strength of the survival threat. From an applied perspective, our findings imply that exposing adult click beetles to <i>M. brunneum </i>to reduce their population densitymight not succeed and is an approach that needs further investigation.</p>
Code and data associated with 'The web architecture, dynamics, and silk investment in the social spider, Stegodyphus sarasinorum'
<p>Location of the main files and folders relevant to the paper:</p> <p>All R based analyses were done with a combination of a Windows 8 laptop and a Linux Mint 19.2 Cinnamon.<br> The nparLD analyses require R version 2.15.3, and the other analyses were done with R version<br> 3.4.4. Multiple versions of R can be installed and run on the same system using the Rbuild and Renv packages. Please see the parts of the Rmd files describing the nparLD analyses to see how this was done.</p> <p>## Silk investment and topology related analyses are in the folder 'web-construction FINAL round- raw data/analysis-FINALround/analysis-results/feb_2016_Rmdfiles/</p> <p>R Markdown notebook files and associated HTML outputs used to replicate figures and results in paper:</p> <p>### Pore-size and coordination number analysis</p> <p>- beleyur_et_al_topology_analyses.Rmd</p> <p>### Silk investment and per-capita analyses</p> <p>- beleyur_et_al_silk_analyses.Rmd</p> <p>### Weight-loss analysis</p> <p>- weight_loss_analysis.Rmd</p> <p>### nparLD analysis scripts</p> <p>- poresize_CN_nparLD.R<br> - silk_nparLD.R</p> <p>## Coordination number and pore size calculations</p> <p>Code and data used to quantify the coordination number and pore size in 'AllResults.zip' - a combination of raw images, .mat data files and .m files that can be analysed using the MATLAB platform.</p> <p>All data and code in 'AllResults.zip'</p> <p> </p> <p>## Raw data location:</p> <p>'web-construction FINAL round- raw data/pics-till 11th March/pics by date and batch/'</p> <p>All raw JPG images are placed according to their batch (A-J), and group size. Please note that not all webs can be finally analysed as having the labelled group size because despite all efforts spiders somehow managed to move between colonies in some cases! Please refer to the actual colonies used in the manuscript, these webs have definitely been built by the specified number of spiders.</p> <p>## Hand-cropped images of only web with retreat</p> <p>'web-construction FINAL round- raw data/pics-till 11th March/cropped_photos_in_one_place/'</p> <p>These are TIF files made after manual cropping of the web pictures. Please see the note above explaining how to choose the webs with valid group sizes.</p> <p> </p> <p> </p> <p> </p> <p> </p> <p> </p>
Data for: Maternal glucocorticoid levels during incubation predict breeding success, but not reproductive investment, in a free-ranging bird
<p>The hormone corticosterone (CORT) has been hypothesized to be linked with fitness, but the directionality of the relationship is unclear. The "CORT-fitness hypothesis" proposes that high levels of CORT arise from challenging environmental conditions, resulting in lower reproductive success (a negative relationship). In contrast, the "CORT-adaptation hypothesis" suggests that, during energetically demanding periods, CORT will mediate physiological or behavioural changes that result in increased reproductive investment and success (a positive relationship). During two breeding seasons, we experimentally manipulated circulating CORT levels in female tree swallows (<i>Tachycineta bicolor</i>) prior to egg laying, and measured subsequent reproductive effort, breeding success, and maternal survival. When females were recaptured during egg incubation and again during the nestling stage, the CORT levels were similar among individuals in each treatment group, and maternal treatment had no effect on indices of fitness. By considering variation among females, we found support for the "CORT-adaptation hypothesis"; there was a significant positive relationship between CORT levels during incubation and hatching and fledging success. During the nestling stage CORT levels were unrelated to any measure of investment or success. Within the environmental context of our study, relationships between maternal glucocorticoid levels and indices fitness vary across reproductive stages.</p>
Late-life reproduction in an insect: terminal investment, reproductive restraint or senescence
<p>1. The Terminal Investment, Reproductive Restraint or Senescence theories may explain individual late-life patterns of reproduction. The terminal investment hypothesis predicts that individuals increase reproductive allocation late in life as prospects for future survival decrease. The other two hypotheses predict reduced reproduction late in life, but for different reasons. Under the Reproductive Restraint hypothesis, individuals restrain their reproductive effort to sustain future survival and gain more time for reproducing, whereas under the Senescence process, reproduction is constrained because of somatic deterioration. While these hypotheses imply that reproduction is costly, they should have contrasted implications in terms of survival after late reproduction and somatic maintenance.</p> <p>2. Testing these hypotheses requires proper consideration of the effects of age-dependent reproductive effort on post-reproduction survival and age-related somatic functions. We experimentally tested these three hypotheses in females of the mealworm beetle, Tenebrio molitor, an iteroparous and income breeder insect. We manipulated their age-specific allocation into reproduction and observed the effects of this manipulation on their late life- fecundity, post-reproduction survival and immunocompetence as a measurement of somatic protection.</p> <p>3. We found that females exhibit age-related declines in fecundity and that this reproductive senescence is accelerated by a cost of early reproduction. The cost of reproduction had no significant effect on female longevity and their ability to survive a bacterial infection, despite that some immune cells were depleted by reproduction. We found that female post-infection survival deteriorated with age, which could be partly explained by a decline in some immune parameters. Importantly, females did not increase their reproductive effort late in life at the expense of their late-life post-reproduction survival.</p> <p>4. Late-life reproduction in T. molitor females is senescing and not consistent with a terminal investment strategy. Rather, our results suggest that females allocate resources according to a priority scheme favouring longevity at the expense of reproduction, which is in line with the reproductive restraint hypothesis.</p> <p>5. Such a priority scheme also shows that a relatively short-lived insect can evolve life history strategies hitherto known only in long-lived animals. This puts in perspective the role of longevity in the evolution of life history strategies. </p>
Eye size and investment in frogs and toads correlate with adult habitat, activity pattern and breeding ecology
<p></p><p>Frogs and toads (Amphibia: Anura) display diverse ecologies and behaviours, which are often correlated with visual capacity in other vertebrates. Additionally, anurans exhibit a broad range of relative eye sizes, which have not previously been linked to ecological factors in this group. We measured relative investment in eye size and corneal size for 220 species of anurans representing all 55 currently recognized families and tested whether they were correlated with six natural history traits hypothesized to be associated with the evolution of eye size. Anuran eye size was significantly correlated with habitat, with notable decreases in eye investment among fossorial, subfossorial and aquatic species. Relative eye size was also associated with mating habitat and activity pattern. Compared to other vertebrates, anurans have relatively large eyes for their body size, indicating that vision is probably of high importance. Our study reveals the role that ecology and behaviour may have played in the evolution of anuran visual systems and highlights the usefulness of museum specimens, and importance of broad taxonomic sampling, for interpreting macroecological patterns.</p><p></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)
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.