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584 results for “larval stages”
Figure 7 in Husbandry, captive breeding, larval development and stages of the Malayan horned frog Megophrys nasuta (Schlegel, 1858) (Amphibia: Anura: Megophryidae)
Figure 7. Megophrys nasuta larvae in stages 30 to 34. Photos: M. Wildenhues.
Figure 6 in Husbandry, captive breeding, larval development and stages of the Malayan horned frog Megophrys nasuta (Schlegel, 1858) (Amphibia: Anura: Megophryidae)
Figure 6. Megophrys nasuta larvae in stages 25 to 29. Photos: M. Wildenhues.
Figure 9 in Husbandry, captive breeding, larval development and stages of the Malayan horned frog Megophrys nasuta (Schlegel, 1858) (Amphibia: Anura: Megophryidae)
Figure 9. Megophrys nasuta larvae in stages 41 to 46. Photos: M. Wildenhues.
Figure 1 in Molecular identification of Haemaphysalis sulcata (Acari: Ixodidae) larval stages collected using the Berlese funnel in Northern Iran
Figure 1. Dorsal aspect of a tick larvae sample collected in this study.
Fig. 1 in Description of immature stages of Laccobius kunashiricus, with a key to genera of the Laccobiini based on larval characters (Coleoptera: Hydrophilidae)
Fig. 1. Egg-case of Laccobius kunashiricus Shatrovskiy, 1984. Arrow indicates egg-case.
Fig. 3 in New data on the early stages and behaviour of the endangered species Callophrys mystaphia (Lepidoptera: Lycaenidae) and its first larval parasitoid, Cotesia sp. (Hymenoptera: Braconidae)
Fig. 3. Larvae of Callophrys mystaphia Miller, 1913 on host plant from various perspectives.
Fig. 5 in New data on the early stages and behaviour of the endangered species Callophrys mystaphia (Lepidoptera: Lycaenidae) and its first larval parasitoid, Cotesia sp. (Hymenoptera: Braconidae)
Fig. 5. Larvae of Callophrys mystaphia Miller, 1913 forming 'feeding windows' on the host plant.
Ornamented species incur higher male mortality in the larval stage
<p>Life-cycle stages are not always capable of evolving independently from each other, but it remains unclear if evolving to meet the demands of one stage actually imposes costs on other stages. Male ornamentation is a useful trait in which to test this potential evolutionary constraint because ornaments improve reproduction in the adult stage but can require the expression of risky traits in the juvenile stage. Here, I compared larval mortality between populations of ornamented and non-ornamented dragonfly species. Since males produce more exaggerated melanin wing ornaments than females, I tested if larval mortality of males is higher in populations of species that have evolved adult male wing ornamentation. My analyses reveal larval mortality is more male-biased in species that have evolved male ornamentation. These findings indicate that evolving to optimize mating for the adult stage imposes a cost to survival in the larval stage. Thus, this study reveals that evolution in one life-cycle stage can shape fitness differences in other stages over macroevolutionary timescales.</p>
Figure 3 in DESCRIPTION OF THE LARVAE OF CRICOTOPUS FESTIVELLUS (KIEFFER 1906) AND CRICOTOPUS DIVERSUS (BOESEL 1983) WITH KEYS TO DISCRIMINATION OF LARVAL, PUPAL AND ADULT STAGES (DIPTERA: CHIRONOMIDAE) Abstract
Figure 3. Cricotopus festivellus; lateral tufts on segment 6 and 7. Veluwerandmeer, 5 October 2016.
Data for: Behavioral evidence of olfactory imprinting during embryonic and larval stages in lake sturgeon
<p>Many migratory fishes are thought to navigate to natal streams using olfactory cues learned during early life stages. However, direct evidence for early-life olfactory imprinting is largely limited to Pacific salmon, and other species suspected to imprint show life history traits and reproductive strategies that raise uncertainty about the generality of the salmonid-based conceptual model of olfactory imprinting in fishes. Here, we studied early-life olfactory imprinting in lake sturgeon (<em>Acipenser fulvescens</em>), which have a life cycle notably different from Pacific salmon, but are nonetheless hypothesized to home via similar mechanisms. We tested one critical prediction of the hypothesis that early-life olfactory imprinting guides natal homing in lake sturgeon: that exposure to odorants during early-life stages results in increased activity when exposed to those odorants later in life. Lake sturgeon were exposed to artificial odorants (phenethyl alcohol and morpholine) during specific developmental windows and durations (limited to the egg, free-embryo, exogenous feeding larvae, and juvenile stages), and later tested as juveniles for behavioral responses to the odorants that were demonstrative of olfactory memory. Experiments revealed that lake sturgeon reared in stream water mixed with artificial odorants for as little as 7 days responded to the odorants in behavioral assays over 50 days after the initial exposure, specifically implicating the free-embryo and larval stages as critical imprinting periods. Our study provides evidence for olfactory imprinting in a non-salmonid fish species, and supports further consideration of conservation tactics such as stream-side rearing facilities that are designed to encourage olfactory imprinting to targeted streams during early life stages. Continued research on lake sturgeon can contribute to a model of olfactory imprinting that is more generalizable across diverse fish species and will inform conservation actions for one of the world's most imperiled fish taxonomic groups.</p>
Data for: Behavioral evidence of olfactory imprinting during embryonic and larval stages in lake sturgeon
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Data from: Larval developmental histories, phenotypes, and stage-specific fitness of a temperate reef fish (<em>Forsterygion lapillum</em>)
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Heat tolerance in tropical Lepidoptera varies with microclimate, life stage, and larval feeding strategy
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Ornamented species incur higher male mortality in the larval stage
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Data from: Metabarcoding on planktonic larval stages: an efficient approach for detecting and investigating life cycle dynamics of benthic aliens
High-throughput sequencing (HTS) technologies offer new promise to support surveillance programs targeting marine non-indigenous species (NIS). Metabarcoding might surpass traditional monitoring methods, for example through its ability to detect rare species, a key feature in early detection of NIS. Another interest of this approach is the identification of organisms difficult to identify based on morphology only (e.g., early developmental stages), making it relevant in the context of management programs. Because many marine benthic NIS have a bi-phasic bentho-pelagic life cycle, targeting their pelagic larval stages in zooplankton may allow early detection and assessment of their establishment and potential spread. We illustrate this approach with an analysis of bulk-DNA retrieved from a time-series of zooplankton samples collected over 22 months in one bay in Brittany (France). Using HTS of amplicons obtained with two markers (COI and 18S) and a metabarcoding approach, 12 NIS were identified and their temporal larval dynamics were monitored. Importantly, we chose to focus on a closed list of species, from four metazoan classes encompassing 52 NIS reported within the study area or nearby seas, with molecular references available or obtained locally for 42 of them. The use of a custom-designed database allowed the detection of three NIS otherwise not detected when using public databases. Interestingly, NIS known to have a short-lived larval stage were detected (e.g., the bryozoan Bugula neritina or the tunicate Corella eumyota). For two molluscs Ruditapes philippinarum and Crepidula fornicata, metabarcoding results were compared to those obtained using traditional methods (i.e., barcoding of individual larvae and morphology, respectively) to show the reliability of the approach in detecting and assessing the extent of their reproductive periods. Our results also revealed that the Pacific oyster Crassostrea gigas, a notorious invasive species, failed to reproduce in the study bay, showing that metabarcoding on larval stages also provides information regarding the establishment success (or failure) of NIS. While metabarcoding has its limitations and biases, this study demonstrates its effectiveness for surveillance of targeted NIS, notably to support management strategies like the European Marine Strategy Framework Directive (MSFD).
FIGURE 6 in Morphological descriptions of the larval and first juvenile stages of the decorator crab Camposcia retusa (Latreille, 1829) from laboratory-reared material
FIGURE 6. Camposcia retusa first crab: A) maxilliped III; B) sternum; C)–G) pereiopods 1–5; H) pleopods 1–5; and I) pleon and telson (dorsal view). Scale bars: A, H and I: 150 µm; B–G: 300 µm.
FIGURE 4 in Morphological descriptions of the larval and first juvenile stages of the decorator crab Camposcia retusa (Latreille, 1829) from laboratory-reared material
FIGURE 4. Camposcia retusa megalopa: A–E) pereiopods 1–5; F) sternum; G)–J) pleopods 1–5; and K) pleon, telson and uropods (dorsal view). Scale bars: A–E and G–K: 150 µm; F: 300 µm.
FIGURE 2. Camposcia retusa zoea II in Morphological descriptions of the larval and first juvenile stages of the decorator crab Camposcia retusa (Latreille, 1829) from laboratory-reared material
FIGURE 2. Camposcia retusa zoea II: A) lateral view; B) antennule; C) antenna; D) mandible; E) maxillule; F) maxilla; G) maxilliped I; H) maxilliped II; I) maxilliped III; J) pereiopods 1–5; and K) pleon and telson (dorsal view). Scale bars: A and K: 300 µm; G, H, I and J: 150 µm; B, C, D, E and F: 75 µm.
FIGURE 5 in Cancrion khanhensis sp. nov. (Crustacea: Isopoda: Entoniscidae) infesting Monomia haanii (Stimpson, 1858) (Crustacea: Brachyura: Portunidae) from Nha Trang Bay, Khanh Hoa, Vietnam, with remarks on larval stages of entoniscids and description of a new family, genus and two new species of hyperparasites
FIGURE 5. Female of Stellatoniscus tentaculus gen. nov., sp. nov. A, immature female (stage I); B, immature female (stage II); C, immature female (stage III); D, mature female. Scale bars: A–C = 1 mm; D = 5 mm.
FIGURE 4 in Cancrion khanhensis sp. nov. (Crustacea: Isopoda: Entoniscidae) infesting Monomia haanii (Stimpson, 1858) (Crustacea: Brachyura: Portunidae) from Nha Trang Bay, Khanh Hoa, Vietnam, with remarks on larval stages of entoniscids and description of a new family, genus and two new species of hyperparasites
FIGURE 4. Cryptoniscus larva of Cancrion khanhensis sp. nov. A, habitus, ventral view, dashed lines indicate missing parts; B, pereopod 1; C, pleopod 1; D, left uropod. Scale bars: A = 100 µm; B, C, D = 10 µm.
ScienceDex guides
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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.