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2,291 results for “life history”
Figure 1 in Interspecific differences in early life-history traits in crested newts (Triturus cristatus superspecies, Caudata, Salamandridae) from the Balkan Peninsula
Figure 1. Larval growth rate of four Triturus species.
Figure 1 in Life history of the spider Selenops occultus Mello-Leitão (Araneae, Selenopidae) from Brazil with notes on the natural history of the genus
Figure 1. Abundance data for each of the six groups of S. occultus for each collection date.
Figure 1 in Fly parasitism in Papuan frogs, with a discussion of ecological factors influencing evolution of life-history differences
Figure 1. Preserved specimen of Rana supragrisea showing enlarged swellings caused by three (two on right side, one on left) infesting larvae of Batrachomyia krausi. Apertures in the skin used to maintain larval access to air are clear on the right; larval respiratory spiracles project from the aperture on left.
FIG. 1 in Australian species of Chordodes (Nematomorpha) with a description of two new species, remarks on the genus Chordodes and its life history
FIG. 1. Protocol of the preparation applied to C. queenslandi and C. brevipilus.
Data from: Macronutrient intake and simulated infection threat independently affect life history traits of male decorated crickets
<p>Nutritional geometry has advanced our understanding of how macronutrients (e.g., proteins and carbohydrates) influence the expression of life history traits and their corresponding trade-offs. For example, recent work has revealed that reproduction and immune function in male decorated crickets are optimized at very different protein:carbohydrate (P:C) dietary ratios. However, it is unclear how an individual's macronutrient intake interacts with its perceived infection status to determine investment in reproduction or other key life history traits. Here, we employed a fully factorial design in which calling effort and immune function were quantified for male crickets fed either diets previously demonstrated to maximize calling effort (P:C = 1:8) or immune function (P:C = 5:1), and then administered a treatment from a spectrum of increasing infection cue intensity using heat-killed bacteria. Both diet and a simulated infection threat independently influenced the survival, immunity, and reproductive effort of males. If they called, males increased calling effort at the low infection cue dose, consistent with the terminal investment hypothesis, but interpretation of responses at the higher threat levels was hampered by the differential mortality of males across infection cue and diet treatments. A high protein, low carbohydrate diet severely reduced the health, survival, and overall fitness of male crickets. There was, however, no evidence of an interaction between diet and infection cue dose on calling effort, suggesting that the threshold for terminal investment was not contingent on diet as investigated here. </p>
Figure 1 in No rest for the weary: restricted resting behaviour of green turtles (Chelonia mydas) at a deep-neritic foraging area influences expression of life history traits
Figure 1. Generalised profiles for the six dive types as defined by Seminoff et al. (2006).
Fig. 1 in Observations on the Life History ofNemozoma championi(Wickham) (Coleoptera: Trogossitidae)
Fig. 1. Nemozoma championi collected from the Sandia Mountains of New Mexico.
Fig. 7 in Ecology and life history of an Amazon floodplain cichlid: the discus fish Symphysodon (Perciformes: Cichlidae)
Fig. 7. Length vs. weight plots for Symphysodon haraldi specimens parasitized with the isopod gill parasite Braga cichlae, and unparasitized specimens. All specimens are from a single colony of discus in Uxi Bay, lago Amanã.
Fig. 4 in Ecology and life history of an Amazon floodplain cichlid: the discus fish Symphysodon (Perciformes: Cichlidae)
Fig. 4. (right column) Testes and ovaries of Symphysodon haraldi at advancing stages of gonadal development. Photographs are from freshly sacrificed and dissected specimens, with the gonads outlined for clarity. The following modified version of Nikolsky's scale of reproductive maturity was utilized: 0. (immature): gonads thin and transparent; sex determination not possible (not illustrated). 1. (early development or resting): testes thin and translucent; ovaries thin and translucent-pink with transparent eggs. 2. (maturing): testes translucent white; ovaries enlarged with white eggs. 3. (mature): testes thick and white; ovaries enlarged with largest eggs yellow. 4. (pre-spawning): testes swollen and sperm-positor everted; ovaries swollen with largest eggs orange, swollen and approximately 1.4 mm in diameter, ovipositor everted. 5. (spent): testes flaccid; ovaries flac- cid with scattered eggs of various size classes (not illustrated).
Fig. 2 in Ecology and life history of an Amazon floodplain cichlid: the discus fish Symphysodon (Perciformes: Cichlidae)
Fig. 2. (a) Flood level and (b) electrical conductivity (EC) monitored in lago Amanã during the period 1995-1998. The timing of sampling in Uxi Bay is marked by A (1998) and B (1997). Dotted horizontal lines mark where shore-scrub (4m) and higher portions of blackwater igapó forest (10m) are inun- dated (Fig. 1). Dotted circles are speculated spawning events for the putative cohort groups 1a through 3 (refer to Fig. 8).
Fig. 6 in Life-history of the South American darter, Characidium pterostictum (Crenuchidae): evidence for small scale spatial variation in a piedmont stream
Fig. 6. Seasonal variation of mean condition factor (K) of Characidium pterostictum in the Lajeado river (southern Brazil). PA, upstream site; PB, downstream site. * In PA no specimen was captured in Summer.
Data from: Landscape, colonization and life history: their effects on genetic diversity in four sympatric species inhabiting a dendritic system
To what degree are patterns of genetic structure in fragmented systems the result of contemporary landscape vs. history? We examined the distribution of genetic diversity as a function of colonization history and contemporary landscape in four fish species inhabiting a hierarchically fragmented, unaltered system, the Kogaluk drainage (Labrador): lake trout, longnose sucker, round whitefish, and lake chub. The footprint of colonization history was still observable in the three species where this issue was examined regardless of the generations since their arrival. ABC analyses suggest colonization took place from the southwest. The species exhibit similar diversity patterns despite different Nes and generation intervals. Contemporary gene flow was largely negligible except for gene flow from a centrally located lake. These results suggest landscape has driven colonization history, which still has influence on genetic structuring. The species are widespread. Understanding how they behave in the pristine Kogaluk provides a baseline against which to evaluate how other anthropogenically perturbed systems are performing. Improved understanding of historical and contemporary processes is required to fully explain diversity patterns in complex metapopulations
Dataset for: Spatial and environmental effects on Coho Salmon life-history trait variation
<p>Adult size, egg mass, fecundity and mass of gonads are affected by trade-offs between reproductive investment and environmental conditions shaping the evolution of life-history traits among populations for widely distributed species. Coho salmon <i>Oncorhynchus kisutch</i> have a large geographic distribution and different environmental conditions are experienced by populations throughout their range. We examined the effect of environmental variables on female size, egg size, fecundity, and reproductive investment of populations of Coho Salmon from across British Columbia using an information theoretic approach. Female size increased with latitude and decreased with migration distance from the ocean to spawning locations. Egg size decreased with average intragravel temperature during incubation, migration distance, in larger rivers, but increased in rivers that were lake headed. Fecundity increased with latitude, warmer temperature during the spawning period, and river size, but decreased in rivers that were lake headed compared to rivers with tributary sources. Gonadal somatic index increased with latitude and decreased with migration distance. Latitude of spawning grounds, migratory distance and temperatures experienced by a population, but also hydrologic features – river size and headwater source – are influential in shaping patterns of reproductive investment, particularly egg size. The lack of an effect of latitude on egg size suggest that local optima for egg size may drive the positive relationship between egg number and latitude – a pattern that is partially off-set by larger female size and gonadal somatic index with latitude.</p>
Threatened salmon rely on a rare life history strategy in a warming landscape
<p>Rare phenotypes and behaviours within a population are often overlooked, yet they may serve a heightened role for species imperilled by rapid warming. In threatened spring-run Chinook salmon spawning at the southern edge of the species range, we show late-migrating juveniles are critical to cohort success in years characterized by droughts and ocean heatwaves. Late migrants rely on cool river temperatures over summer, increasingly rare due to the combined effects of warming and impassable dams. Despite the dominance of late migrants, other strategies played an important role in many years. Our results suggest that further loss of phenotypic diversity will have critical impacts on population persistence in a warming climate. Predicted thermally suitable river conditions for late migrants will shrink rapidly in the future and will be largely relegated above impassable dams. Reconnecting diverse habitat mosaics to support phenotypic diversity will be integral to the long-term persistence of this species.</p>
FIGURE 31 in Identification of early life-history stages of Caribbean Apogon (Perciformes: Apogonidae) through DNA Barcoding
FIGURE 31. Apogon sp. 2, adult, 21.1 mm SL, DNA # SAB 0603030, photograph by J. T. Williams.
FIGURE 21 in Identification of early life-history stages of Caribbean Apogon (Perciformes: Apogonidae) through DNA Barcoding
FIGURE 21. Apogon maculatus, adult, 38.0 mm SL, DNA # BLZ 4170, photograph by L. Weigt.
FIGURE 19 in Identification of early life-history stages of Caribbean Apogon (Perciformes: Apogonidae) through DNA Barcoding
FIGURE 19. Apogon pseudomaculatus, juvenile, 19.0 mm SL, DNA # CUR 8079, photograph by C. Baldwin.
FIGURE 14 in Identification of early life-history stages of Caribbean Apogon (Perciformes: Apogonidae) through DNA Barcoding
FIGURE 14. Apogon lachneri, juvenile, 21.0 mm SL, DNA # BLZ 5265, photograph by J. Mounts.
FIGURE 10 in Identification of early life-history stages of Caribbean Apogon (Perciformes: Apogonidae) through DNA Barcoding
FIGURE 10. Apogon phenax, adult, 32.0 mm SL, DNA # BLZ 5268, photograph by J. Mounts.
FIGURE 9 in Identification of early life-history stages of Caribbean Apogon (Perciformes: Apogonidae) through DNA Barcoding
FIGURE 9. Apogon planifrons, larva, 9.5 mm SL, DNA # BLZ 7126, photograph by J. Mounts.
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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.