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58 results for “arctic ecology”
FIGURE 10 in Morphological development, distribution and ecology of the arctic oribatid mite Hermannia scabra (Acari: Oribatida: Hermanniidae) and synonymy of Hermannia gigantea
FIGURE 10. Hermannia scabra (L. Koch, 1879), larva: A—dorsal view (legs omitted); B—ventral view (gnathosoma and legs except trochanters omitted). Scale bar 100 μm.
FIGURE 8 in Morphological development, distribution and ecology of the arctic oribatid mite Hermannia scabra (Acari: Oribatida: Hermanniidae) and synonymy of Hermannia gigantea
FIGURE 8. Hermannia scabra (L. Koch, 1879), adult, microscope images: A—lateral view; B—ventral view; C—lateral view.
FIGURE 7 in Morphological development, distribution and ecology of the arctic oribatid mite Hermannia scabra (Acari: Oribatida: Hermanniidae) and synonymy of Hermannia gigantea
FIGURE 7. Hermannia scabra (L. Koch, 1879), adult, SEM micrographs: A—part of tuberculate prodorsal surface with bothridial and exobothridial setae and bothridium; B—part of tuberculate notogastral surface with notogastral seta d1. Scale bars 20 μm.
FIGURE 23 in Morphological development, distribution and ecology of the arctic oribatid mite Hermannia scabra (Acari: Oribatida: Hermanniidae) and synonymy of Hermannia gigantea
FIGURE 23. Map on distribution of Hermannia scabra (L. Koch, 1879) and H. nodosa Michael, 1888 in the Arctic (designations: dark blue circle—H. scabra, red circle—H. nodosa; full circles—original data, see Appendix, circles with white center—literature data; on Trägardh 1900, 1931; Nordenskiöld 1901; Thor 1937; Hammer 1944, 1955; Sellnick 1949; Dalenius 1950, 1960; Eglitis 1954; Karppinen 1971; Behan 1978; Woas 1978; Gjelstrup & Søchting 1979; Golosova et al. 1983; Colloff 1988; Gjelstrup, Solhøy 1994; Brodo 2000; Eitminaviciute 2003; Krivolutsky et al. 2003; Chernov 2004; Seniczak et al. 2017b); * marks record "Novaya Zemlya" without detalization (Krivolutsky et al. 2003).
FIGURE 4 in Morphological development, distribution and ecology of the arctic oribatid mite Hermannia scabra (Acari: Oribatida: Hermanniidae) and synonymy of Hermannia gigantea
FIGURE 4. Hermannia scabra (Koch, 1879), adult, SEM micrographs: A—dorsal view; B—ventral view. Scale bars 100 μm.
FIGURE 15 in Morphological development, distribution and ecology of the arctic oribatid mite Hermannia scabra (Acari: Oribatida: Hermanniidae) and synonymy of Hermannia gigantea
FIGURE 15. Hermannia scabra (L. Koch, 1879), larva (A–C) and protonymph (D): A—leg I, right, antiaxial view; B—leg II, right, dorsoantiaxial view; C—leg III, left, antiaxial view; D—leg IV, left, antiaxial view. Scale bars 50 μm.
FIGURE 3 in Morphological development, distribution and ecology of the arctic oribatid mite Hermannia scabra (Acari: Oribatida: Hermanniidae) and synonymy of Hermannia gigantea
FIGURE 3. Hermannia scabra (L. Koch, 1879), adult: A—leg I, without trochanter, right, antiaxial view; B—leg II, without trochanter, right, antiaxial view; C—leg III, left, antiaxial view; D—leg IV, right, antiaxial view. Scale bar 100 μm.
FIGURE 12 in Morphological development, distribution and ecology of the arctic oribatid mite Hermannia scabra (Acari: Oribatida: Hermanniidae) and synonymy of Hermannia gigantea
FIGURE 12. Hermannia scabra (L. Koch, 1879), tritonymph: A—dorsal view (legs omitted); B—posterior part of body, lateral view. Scale bar 100 μm.
FIGURE 19 in Morphological development, distribution and ecology of the arctic oribatid mite Hermannia scabra (Acari: Oribatida: Hermanniidae) and synonymy of Hermannia gigantea
FIGURE 19. Hermannia scabra (L. Koch, 1879), tritonymph (A), slightly deformed, and larva (B), SEM micrographs: A—lateral view; B—part of sternal region with folds and epimeral setae 1a and 2a. Scale bars 100 μm (A), 10 μm (B).
FIGURE 11 in Morphological development, distribution and ecology of the arctic oribatid mite Hermannia scabra (Acari: Oribatida: Hermanniidae) and synonymy of Hermannia gigantea
FIGURE 11. Hermannia scabra (L. Koch, 1879), larva (A–C, F, E) and protonymph (D): A—anterior part of body, lateral view (gnathosoma and legs except trochanters omitted); B—posterior part of body, lateral view; C, D—subcapitulum, ventral view; E—palp, left, paraxial view; F—chelicera, right, antiaxial view. Scale bars 100 μm (A, B), 20 μm (C, D, F), 10 μm (E).
FIGURE 1 in Morphological development, distribution and ecology of the arctic oribatid mite Hermannia scabra (Acari: Oribatida: Hermanniidae) and synonymy of Hermannia gigantea
FIGURE 1. Hermannia scabra (L. Koch, 1879), adult: A—dorsal view; B—subcapitulum, ventral view; C—palp, left, antiaxial view; D—chelicera, left, paraxial view. Scale bars 100 μm (A), 50 μm (B, D), 20 μm (C).
FIGURE 22 in Morphological development, distribution and ecology of the arctic oribatid mite Hermannia scabra (Acari: Oribatida: Hermanniidae) and synonymy of Hermannia gigantea
FIGURE 22. Hermannia scabra (L. Koch, 1879), dissected larva (A–D, F, H) and dissected protonymph (E, G), microscope images: A—rostrum; B—part of prodorsal surface with ribs and rostral and lamellar setae; C—bothridial, exobothridial and interlamellar setae and bothridium; D, E—part of gastronotic region with folds, tuberculate swellings of folds and gastronotic setae d1; F—part of gastronotic region with tuberculate-reticulate surface at opening of opisthonotal gland and gastronotic setae f2; G—part of subcapitular mentum with subcapitular setae; H—part of leg femora II with reticulate surface and seta d.
FIGURE 17 in Morphological development, distribution and ecology of the arctic oribatid mite Hermannia scabra (Acari: Oribatida: Hermanniidae) and synonymy of Hermannia gigantea
FIGURE 17. Hermannia scabra (L. Koch, 1879), larva, slightly deformed, SEM micrographs: A—dorsal view; B—ventral view. Scale bars 50 μm (A), 100 μm (B).
FIGURE 14 in Morphological development, distribution and ecology of the arctic oribatid mite Hermannia scabra (Acari: Oribatida: Hermanniidae) and synonymy of Hermannia gigantea
FIGURE 14. Hermannia scabra (Koch, 1879), nymphs: A, B, C—anogenital region of proto-, deuto- and tritonymphs, respectively. Scale bar 50 μm.
FIGURE 21 in Morphological development, distribution and ecology of the arctic oribatid mite Hermannia scabra (Acari: Oribatida: Hermanniidae) and synonymy of Hermannia gigantea
FIGURE 21. Hermannia scabra (L. Koch, 1879), larva (A–C), deutonymph (D–F) and tritonymph (G–I), microscope images: A, D, G—dorsal view; B, E, H—lateral view; C, F, I—ventral view.
FIGURE 5 in Morphological development, distribution and ecology of the arctic oribatid mite Hermannia scabra (Acari: Oribatida: Hermanniidae) and synonymy of Hermannia gigantea
FIGURE 5. Hermannia scabra (L. Koch, 1879), adult, SEM micrographs: A—anterior view; B—posterior view. Scale bars 200 μm (A), 100 μm (B).
Data from - Ecological insights from three decades of animal movement tracking across a changing Arctic
<p>We provide here the data used in analysis of 3 test cases, presented in the manuscript "Ecological insights from three decades of animal movement tracking across a changing Arctic". We utilized the new Arctic Animal Movement Archive (AAMA), a growing collection of 201 standardized terrestrial and marine animal tracking studies from 1991–present. The AAMA supports public data discovery, preserves fundamental baseline data for the future, and facilitates efficient, collaborative data analysis. With three AAMA-based case studies, we document climatic influences on the migration phenology of eagles, geographic differences in adaptive response of caribou reproductive phenology to climate change, and species-specific changes in terrestrial mammal movement rates in response to increasing temperature. </p>
Data from: Latitudinal variation in ecological opportunity and intraspecific competition indicates differences in niche variability and diet specialization of Arctic marine predators
Individual specialization (IS), where individuals within populations irrespective of age, sex, and body size are either specialized or generalized in terms of resource use, has implications on ecological niches and food web structure. Niche size and degree of IS of near-top trophic-level marine predators have been little studied in polar regions or with latitude. We quantified the large-scale latitudinal variation of population- and individual-level niche size and IS in ringed seals (Pusa hispida) and beluga whales (Delphinapterus leucas) using stable carbon and nitrogen isotope analysis on 379 paired ringed seal liver and muscle samples and 124 paired beluga skin and muscle samples from eight locations ranging from the low to high Arctic. We characterized both within- and between-individual variation in predator niche size at each location as well as accounting for spatial differences in the isotopic ranges of potential prey. Total isotopic niche width (TINW) for populations of ringed seals and beluga decreased with increasing latitude. Higher TINW values were associated with greater ecological opportunity (i.e., prey diversity) in the prey fish community which mainly consists of Capelin (Mallotus villosus) and Sand lance (Ammodytes sp.) at lower latitudes and Arctic cod (Boreogadus saida) at high latitudes. In beluga, their dietary consistency between tissues also known as the within-individual component (WIC) increased in a near 1:1 ratio with TINW (slope = 0.84), suggesting dietary generalization, whereas the slope (0.18) of WIC relative to TINW in ringed seals indicated a high degree of individual specialization in ringed seal populations with higher TINWs. Our findings highlight the differences in TINW and level of IS for ringed seals and beluga relative to latitude as a likely response to large-scale spatial variation in ecological opportunity, suggesting species-specific variation in dietary plasticity to spatial differences in prey resources and environmental conditions in a rapidly changing ecosystem.
Data from: Ground ice melt in the high Arctic leads to greater ecological heterogeneity
1. The polar desert biome of the Canadian high Arctic Archipelago is currently experiencing some of the greatest mean annual air temperature increases on the planet, threatening the stability of ecosystems residing above temperature-sensitive permafrost. 2. Ice wedges are the most widespread form of ground ice, occurring in up to 25% of the world's terrestrial near-surface, and their melting (thermokarst) may catalyze a suite of biotic and ecological changes, facilitating major ecosystem shifts. 3. These unknown ecosystem shifts raise serious questions as to how permafrost stability, vegetation diversity, and edaphic conditions will change with a warming high Arctic. Ecosystem and thermokarst processes tend to be examined independently, limiting our understanding of a coupled system whereby the effect of climate change on one will affect the outcome of the other. 4. Using in-depth, comprehensive field observations and a space-for-time approach, we investigate the highly structured landscape that has emerged due to the thermokarst-induced partitioning of microhabitats. We examine differences in vegetation diversity, community composition, and soil conditions on the Fosheim Peninsula, Ellesmere Island, Nunavut. We hypothesize that: (i) greater ice wedge subsidence results in increased vegetation cover due to elevated soil moisture, thereby decreasing the seasonal depth of thaw and restricting groundwater outflow; (ii) thermokarst processes result in altered vegetation richness, turnover, and dispersion, with greater microhabitat diversity at the landscape scale; (iii) shifts in hydrology and plant community structure alter soil chemistry. 5. We found that the disturbance caused by melting ice wedges catalyzes a suite of environmental and biotic effects: topographical changes, a new hydrological balance, significant species richness and turnover changes, and distinct soil chemistries. Thermokarst areas favour a subset of species unique from the polar desert and are characterized by greater species turnover (β-diversity) across the landscape. 6. Synthesis. Our findings suggest that projected increases of thermokarst in the polar desert will lead to the increased partitioning of microhabitats, creating a more heterogeneous high arctic landscape through diverging vegetation communities and edaphic conditions, resulting in a wetland-like biome in the high Arctic that could replace much of the ice-rich polar desert.
Data from: Ice-cover is the principal driver of ecological change in High Arctic lakes and ponds
Recent climate change has been especially pronounced in the High Arctic, however, the responses of aquatic biota, such as diatoms, can be modified by site-specific environmental characteristics. To assess if climate-mediated ice cover changes affect the diatom response to climate, we used paleolimnological techniques to examine shifts in diatom assemblages from ten High Arctic lakes and ponds from Ellesmere Island and nearby Pim Island (Nunavut, Canada). The sites were divided a priori into four groups ("warm", "cool", "cold", and "oasis") based on local elevation and microclimatic differences that result in differing lengths of the ice-free season, as well as about three decades of personal observations. We characterized the species changes as a shift from Condition 1 (i.e. a generally low diversity, predominantly epipelic and epilithic diatom assemblage) to Condition 2 (i.e. a typically more diverse and ecologically complex assemblage with an increasing proportion of epiphytic species). This shift from Condition 1 to Condition 2 was a consistent pattern recorded across the sites that experienced a change in ice cover with warming. The "warm" sites are amongst the first to lose their ice covers in summer and recorded the earliest and highest magnitude changes. The "cool" sites also exhibited a shift from Condition 1 to Condition 2, but, as predicted, the timing of the response lagged the "warm" sites. Meanwhile some of the "cold" sites, which until recently still retained an ice raft in summer, only exhibited this shift in the upper-most sediments. The warmer "oasis" ponds likely supported aquatic vegetation throughout their records. Consequently, the diatoms of the "oasis" sites were characterized as high-diversity, Condition 2 assemblages throughout the record. Our results support the hypothesis that the length of the ice-free season is the principal driver of diatom assemblage responses to climate in the High Arctic, largely driven by the establishment of new aquatic habitats, resulting in increased diversity and the emergence of novel growth forms and epiphytic species.
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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.