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498 results for “Columbia”
FIGURE 4 in Re-description of Azygokeras columbiae Koeller & Littlepage, 1976 (Calanoida: Aetideidae) and musculature of the male grasping antennule
FIGURE 4. Azygokeras columbiae male: A, mandible; B, maxilliped; C, leg 2, posterior surface, remainder of exopod missing; D, leg 5, posterior surface, note right endopod bent. Scale bars represent 0.1 mm.
FIGURE 1 in Re-description of Azygokeras columbiae Koeller & Littlepage, 1976 (Calanoida: Aetideidae) and musculature of the male grasping antennule
FIGURE 1. Azygokeras columbiae female: A, anterior head, lateral view; B, posterior prosome and urosome, lateral view; C, antennule, segments I–XVI; D, antennule, segments XVII-XXIII; E, antennule, segments XXIV–XXVIII; F, antennule, segments XXVII–XXVIII; G, antenna exopod; H, leg 1, basis and segment 1 of exopod and endopod, outer seta of basis indicated with arrow. Scale bars represent 0.1 mm.
FIGURE 12. A–D in The Ascidiacea collected during the 2017 British Columbia Hakai MarineGEO BioBlitz
FIGURE 12. A–D: Pyuridae; E, F: Molgulidae. A: Halocynthia aurantium 10 cm in length; B: Halocynthia igaboja; C: Boltenia villosa; D: Pyura haustor; E: Molgula pacifica whole animal left side, tunic removed; F: M. pacifica close-up of siphons. Scale bars: B, 5 mm; C, 5 mm; D, 5 mm; E, 1.6 mm.
FIGURE 11. Styelidae. A in The Ascidiacea collected during the 2017 British Columbia Hakai MarineGEO BioBlitz
FIGURE 11. Styelidae. A: Cnemidocarpa finmarkiensis about 2 cm in width; B: Metandrocarpa dura; C: M. taylori; D: Styela gibbsii 1.7 cm in length; E: S. montereyensis, longest one 8 cm; F: S. truncata 2 cm in length. Scale bars: B, 1 mm; C, 2.5 mm. A and F photos by G. Paulay.
FIGURE 8. Aplousobranchia, Ritterellidae. A–C in The Ascidiacea collected during the 2017 British Columbia Hakai MarineGEO BioBlitz
FIGURE 8. Aplousobranchia, Ritterellidae. A–C: Ritterella pulchra. A, whole colony; B, enlargement of one lobe of living colony; C, one zooid. D–G: Ritterella rubra. D, E: two lobes of same colony; F: one zooid; G; enlargement of thorax of same zooid. Scale bars: A, 0.7 cm; B, 1 mm; C, 4 mm; D, 5 mm; E: 7 mm; F, 1.2 mm. Photo D by G. Paulay.
FIGURE 10. Figure 10. Phlebobranchia. A, B in The Ascidiacea collected during the 2017 British Columbia Hakai MarineGEO BioBlitz
FIGURE 10. Figure 10. Phlebobranchia. A, B: Ascidia columbiana. A: whole animal right side, anterior on the right. Arrows indicate oral siphon opening (on right) and atrial opening above. B: anterior end around oral opening showing tunic papillations. C: Ascidia paratropa 9 cm in length; D: Ciona savignyi 6.2 cm in length; E: Chelyosoma productum 1.5 cm in diameter; F: Corella inflata about 3 cm in length; G: Corella willmeriana about 3 cm in length; H: Perophora annectens. Scale bars: A, 1.5 cm; B, 2 mm; H, 4 mm. C, D, F, G photos by G. Paulay.
FIGURE 6 in The Ascidiacea collected during the 2017 British Columbia Hakai MarineGEO BioBlitz
FIGURE 6. Aplousobranchia, Holozoidae, various color morphs of Distaplia occidentalis. A: small mushroom-shaped colony. B–D: flat colonies. E: flat encrusting colony with protruding capitate heads. F: brood sac removed from tunic. Arrow indicates location of attachment to zooid. G: tadpole. Scale bars: A, 1 cm; B, 1 cm; C, 1.25 mm; D, 1.7 cm; E, 1 cm; F, 0.85 mm; G, 0.4 mm. D and E photos by G. Paulay.
FIGURE 7. Aplousobranchia. A, B in The Ascidiacea collected during the 2017 British Columbia Hakai MarineGEO BioBlitz
FIGURE 7. Aplousobranchia. A, B: Holozoidae, Distaplia smithi. A: whole colony. B: enlargement of part of same colony. Scale bars: A, 1.7 cm; B, 0.5 cm. Photo A by G. Paulay.
FIGURE 4. Aplousobranchia, Didemnidae. A–C in The Ascidiacea collected during the 2017 British Columbia Hakai MarineGEO BioBlitz
FIGURE 4. Aplousobranchia, Didemnidae. A–C: Diplosoma listerianum. A: colony on Scyra acutifrons; B, C: close-ups of zooids from two different color morphs. D–F: Trididemnum alexi. D: colony on living scallop; E: same colony closeup with amphipod Polycheria osborni burrowed into tunic surface; F: tunic spicules. Scale bars: A, 1 cm; B, 1.5 mm; C, 1.3 mm; D, 1.6 cm; E, 3.2 mm; F, 35 µm. Photos B and D by G. Paulay.
FIGURE 9. Aplousobranchia. A–D in The Ascidiacea collected during the 2017 British Columbia Hakai MarineGEO BioBlitz
FIGURE 9. Aplousobranchia. A–D: Clavelinidae. A: Clavelina huntsmani. B–D: Pycnoclavella stanleyi. B: expanded orange thoraxes extended beyond sandy tubes. C: thoraxes partially contracted. Photo includes four zooids of orange Metandrocarpa taylori. D: zooids fully contracted; only a bit of orange is visible. E, F: Euherdmaniidae, Euherdmania claviformis. E: zooids fully retracted into long sand-encrusted tubes. F: In this colony the anterior portions of the tubes not sand-encrusted, though the colorless zooid thoraxes are partially contracted. Scale bars: A, 7 mm; B, 2 mm; C, 4 mm; D, 1 cm; E, 1.2 cm; F, 1 cm. A, B, D, F photos by G. Paulay.
FIGURE 5. Didemnidae. A–E in The Ascidiacea collected during the 2017 British Columbia Hakai MarineGEO BioBlitz
FIGURE 5. Didemnidae. A–E: Didemnum sp. 1, undescribed species. A: whole colony on kelp holdfast. B: detail of tunic surface showing one cloacal opening. C: bifurcated testis from a zooid showing numerous coils of the sperm duct; D: tunic spicules. E: two cryptically colored lamellarid nudibranchs above a colony piece from which they were collected. F, G: Didemnum sp. 2. F: numerous small colonies or pieces of same colony; G: two cross sections of a different colony showing distribution of spicules. Scale bars: A, 1 cm; B, 1.5 mm; C, 0.1 mm; D, 20 µm; E, 1 cm.; F, 9 mm; G, 4 mm.
FIGURE 2. Aplousobranchia, Polyclinidae. A–D, Aplidium kottae. A, B in The Ascidiacea collected during the 2017 British Columbia Hakai MarineGEO BioBlitz
FIGURE 2. Aplousobranchia, Polyclinidae. A–D, Aplidium kottae. A, B: part of colony; C: siphons of a single zooid; D: tad- pole. E: Aplidium californicum. F–H: Aplidium sp. F, G: part of colony; H: zooid. Scale bars: A, 1.4 cm; B, 0.7 cm; C, 34 µm; D, 143 µm; E, 0.7 cm; F, 1 cm; G, 4 mm; H, 1 mm.
FIGURE 3. Aplousobranchia, Polycitoridae. A, B in The Ascidiacea collected during the 2017 British Columbia Hakai MarineGEO BioBlitz
FIGURE 3. Aplousobranchia, Polycitoridae. A, B: Cystodytes lobatus. A: whole colony, photo G. Paulay; B: small part of tunic showing disc–shaped spicules. C: Eudistoma purpuropunctatum 10 cm in width. D–F: Eudistoma ritteri. D: separated lobes of a colony; E: part of a different colony; F: thorax of single zooid showing the siphons and the three rows of stigmata. Scale bars: A, 1 cm; B, 0.5 mm; D, 1.3 cm; E, 0.5 cm; F, 1 mm.
FIGURE 1. A in The Ascidiacea collected during the 2017 British Columbia Hakai MarineGEO BioBlitz
FIGURE 1. A: Map of the central British Columbia coast with the Calvert Island region in red box. B: western part of Calvert Island with the Hakai Institute circled in yellow. Map and photo courtesy of Matt Whalen.
Data from: Multi-parametric study of behavioural modulation in demersal decapods at the VENUS cabled observatory in Saanich Inlet, British Columbia, Canada
Understanding biological rhythms in benthic ecosystems and their modulation by habitat cycles has important implications for resource and ecosystem management. The recent development of permanent, multi-sensor seafloor observatories in deep-water environments provides opportunities for the in situ investigation of the behaviour of benthic organisms in relation to habitat variability. This paper describes a multi-disciplinary investigation at the VENUS observatory platform in Saanich Inlet, an intermittently anoxic fjord (Vancouver Island, Canada). A remotely operated digital camera (103 m depth) was used to document changes in the abundance of shrimp (Spirontocaris spp.) and the squat lobster (Munida quadrispina), as well as bacterial mat coverage (Beggiatoa spp.). These data were used as proxies of diel rhythms related to day–night and internal tidal cycles. Seafloor photos were acquired hourly during consecutive days, before, during and after oxygen intrusion events in the fall of 2009. In order to relate biological fluctuations to habitat cycles, bottom water pressure, temperature, dissolved oxygen, and nitrate data were also acquired from the observatory database. Periodogram analysis showed a weak internal-tide-associated rhythmicity for Spirontocaris spp. that was absent in M. quadrispina and in bacterial mat coverage. Waveform analysis confirmed the absence of any day–night fluctuation in all tested species. However, a rapid intrusion of oxygenated water at the study site influenced visual counts of species, possibly blurring detectable activity rhythms. Temperature and nitrate fluctuations were more accentuated during spring tides but cross-correlation analysis indicated an absence of species responses to these habitat variables. Results are discussed within the context of the complex oceanographic dynamics of Saanich Inlet and with respect to understanding the ecological consequences of expanding hypoxia in the global ocean.
Data from: Population genetic structure of the western cherry fruit fly Rhagoletis indifferens (Diptera: Tephritidae) in British Columbia, Canada
1. Population connectivity and movement are key ecological parameters influencing the impact of pests, and are important considerations in control strategies. For many insects, these parameters are difficult to assess directly, although they may be assessed indirectly using population genetic data. 2. We used microsatellite markers to examine population genetic structure of the western cherry fruit fly, the main pest of cherry crops in western North America, in British Columbia, Canada, and make inferences about connectivity and potential for movement among populations. 3. Comparing populations from four geographical regions (separated by up to approximately 400 km), we found significant genetic differentiation both among and within regions. Using populations as the units of analysis, we observed significant isolation by distance (IBD) at larger spatial scales but not below approximately 20 km. By contrast, using individual flies as the units of analysis, we found significant IBD at scales as small as < 100 m. We saw no evidence of genetic differentiation among populations sampled from different species/varieties of plants. 4. Our results suggest that the movement of individual flies is limited, although high levels of gene flow are maintained at scales of up to 20 km, possibly through combined effects of stepping-stone gene flow and large population sizes.
The Burgess Shale paleocommunity with new insights from Marble Canyon, British Columbia
<p>The middle (Wuliuan Stage) Cambrian Burgess Shale is famous for its exceptional preservation of diverse and abundant soft-bodied animals through the "thick" Stephen Formation. However, with the exception of the Walcott Quarry (Fossil Ridge) and the stratigraphically older Tulip Beds (Mount Stephen) which are both in Yoho National Park (British Columbia), quantitative assessments of the Burgess Shale have remained limited. Here we first provide a detailed quantitative overview of the diversity and structure of the Marble Canyon Burgess Shale locality based on 16,438 specimens. Located 40 km southeast of the Walcott Quarry in Kootenay National Park (British Columbia), Marble Canyon represents the youngest site of the "thick" Stephen Formation. We then combine paleoecological datasets from Marble Canyon, Walcott Quarry, Tulip Beds and for the first time, the Raymond Quarry, which lies ca. 20 m directly above the Walcott Quarry, to yield a combined species abundance dataset of 77,179 specimens encompassing 234 taxa. Material from the Tulip Beds comes from talus slopes whereas material from all the other localities was collected in situ and comes from stratigraphically constrained intervals<b> </b>of at least 2 m.<b> </b>Marble Canyon shows significant temporal changes in both taxonomic and ecological groups, suggesting periods of stasis followed by rapid turnover patterns at local and short temporal scales. At wider geographic and temporal scales, the different Burgess Shale sites occupy distinct areas in multivariate space. Overall, this suggests that the Burgess Shale palaeocommunity is far patchier than previously thought and varies at both local and regional scales through the "thick" Stephen Formation. This underscores that our understanding of Cambrian diversity and ecological networks, particularly in early animal ecosystems, remains limited and highly dependent on new discoveries.</p>
FIGURE 1 in Validity of Lampetra pacifica (Petromyzontiformes: Petromyzontidae), a brook lamprey described from the lower Columbia River Basin
FIGURE 1. Map of localities discussed in text. Type localities are indicated by species labels, and numbers correspond with identifiers in Table 1. Stars are localities for populations of L. pacifica; dots are localities for populations of L. richardsoni. The Tualatin River (4) includes three sampling sites, including McKay Creek.
FIGURE 3 in Validity of Lampetra pacifica (Petromyzontiformes: Petromyzontidae), a brook lamprey described from the lower Columbia River Basin
FIGURE 3. Percent sequence divergence (Kimura 2-parameter, K2P) in 1191 bp cyt b within and between Lampetra richardsoni and L. pacifica populations, including type localities (with*). All populations except the type locality of L. richardsoni (Smith Creek, Cultus Lake, BC) are in the Columbia Basin (see Map, Fig. 1). Tualatin specimens were from McKay Creek. Numbers of specimens in parentheses.
Fig. 1 in Autumn Activity of AdultAgriotes lineatus(Linnaeus) (Coleoptera: Elateridae) in Southwestern British Columbia
Fig. 1. Site from which Agriotes lineatus samples were acquired and its state of cultivation. A = Garden area of bare soil and crop residue from where beetles were observed and collected in 2013; B = Permanent grass area from where soil cores were extracted (four cores per dot) in 2014; C = Forage crop in 2013 and 2014; D = Forage crop in 2013, tilled and planted to blueberry in summer 2014, dots within polygon indicate position of pitfall traps in 2014 and 2015; E = Greenhouses.
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
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OpenNeuro
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