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161 results for “octopus”
Octopus maya SPAdes preassembly
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Octopus maya decontaminated FSCR
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Octopus americanus SPAdes preassembly
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Octopus mimus SPAdes preassembly
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[OBSOLETE] OCTOPUS Database v.2: The SahulArch TL collection
<p>Database of published thermoluminescence (TL) ages for archaeological records from Sahul. Sample locations were obfuscated within a radius of 25 km and spatial data includes sample locations as circular polygons. The data uses the WGS84/Pseudo-Mercator (EPSG: 3857) projected coordinate reference system. Sample metadata is comprehensive and includes bibliographic, contextual, and sample preparation and measurement related information.</p>
[OBSOLETE] OCTOPUS Database v.2: The SahulArch Radiocarbon collection
<p>Database of published radiocarbon ages for archaeological records from Sahul. Sample locations were obfuscated within a radius of 25 km and spatial data includes sample locations as circular polygons. The data uses the WGS84/Pseudo-Mercator (EPSG: 3857) projected coordinate reference system. Sample metadata is comprehensive and includes bibliographic, contextual, and sample preparation and measurement related information.</p>
[OBSOLETE] OCTOPUS Database v.2: The SahulArch OSL collection
<p>Database of published optically stimulated luminescence (OSL) ages for archaeological records from Sahul. Sample locations were obfuscated within a radius of 25 km and spatial data includes sample locations as circular polygons. The data uses the WGS84/Pseudo-Mercator (EPSG: 3857) projected coordinate reference system. Sample metadata is comprehensive and includes bibliographic, contextual, and sample preparation and measurement related information.</p>
Data from: Persistent genetic signatures of historic climatic events in an Antarctic octopus
Repeated cycles of glaciation have had major impacts on the distribution of genetic diversity of the Antarctic marine fauna. During glacial periods, ice cover limited the amount of benthic habitat on the continental shelf. Conversely, more habitat and possibly altered seaways, were available during interglacials when the ice receded and the sea level was higher. We used microsatellites and partial sequences of the mitochondrial cytochrome oxidase c subunit 1 (MT-CO1) gene to examine genetic structure in the direct-developing, endemic Southern Ocean octopod Pareledone turqueti Joubin, 1905 sampled from a broad range of areas that circumvent the Antarctic continent. We find that, unusually for a species with poor dispersal potential, P. turqueti has a circumpolar distribution and is also found off the islands of South Georgia and Shag Rocks. The overriding pattern of spatial genetic structure can be explained by hydrographic (with ocean currents both facilitating and hindering gene flow) and bathymetric features. The Antarctic Peninsula region displays a complex population structure, consistent with its varied topographic and oceanographic influences. Genetic similarities between the Ross and Weddell Seas, however, are interpreted as a persistent historic genetic signature of connectivity during the hypothesized Pleistocene Western Antarctic Ice Sheet collapses. A calibrated molecular clock indicates two major lineages within P. turqueti, a continental lineage and a subAntarctic lineage, that diverged in the mid-Pliocene with no subsequent gene flow. Both lineages survived subsequent major glacial cycles. Our data are indicative of potential refugia around the Antarctic continent within the Ross Sea, Weddell Sea and off Adélie Land, with mean age of mtDNA diversity within these main continental lineages coinciding with Pleistocene glacial cycles.
Figure 3 in Diversity in the diet of the predator Octopus cyanea in the coral reef system of Moorea, French Polynesia
Figure 3. Correlates of diversity in the diet of Octopus cyanea at each of five sampling sites. Dietary diversity (as midden species richness) was positively correlated with diversity of substrate types across the site (top) and with increasing octopus density (bottom). Each point represents all octopuses at a single site. N indicates the number of prey individuals represented by remains at each site.
Figure 1 in Diversity in the diet of the predator Octopus cyanea in the coral reef system of Moorea, French Polynesia
Figure 1. Locations of four nearshore fringing reef sites surveyed for octopuses on the island of Moore'a, adjacent to Tahiti, French Polynesia. The Gump site was located at the Richard B. Gump South Pacific Research Station. Insets indicate the spatial arrangements of dens at two sites: circles indicate dens by marker ID; connecting lines indicate the distance to adjacent dens (in metres, not to scale). Blank line maps of Tahiti and Moorea, and globe used with permission from WorldAtlas.com and FreeUSandWorldmaps.com; den inset by TL.
Figure 2 in Octopus mimicking its follower reef fish
Figure 2. (A) When moving alone, the octopus Octopus insularis adopts the bicolour pattern (taken from a video frame) similar to that of Cephalopholis fulva (B).
Figure 1 in Octopus mimicking its follower reef fish
Figure 1. (A) Octopus insularis (centre) followed by 10 Cephalopholis fulva. (B) While moving backwards jet-propelled, the octopus (centre) matches the bicolour contrasting pattern of the accompanying C. fulva, becoming inconspicuous within the fish group (taken from a video frame). (C) Detail of another fish–octopus group, showing the octopus matching another colour pattern (uniform brown) of C. fulva.
Figure 1. A in The den ecology and the effects of fishing pressure on the distribution of Octopus cyanea (Octopodidae: Mollusca) in Rodrigues lagoon, Rodrigues, Mauritius
Figure 1. A map of the geographical location of the island of Rodrigues showing the four protected areas in the north and north west (solid lines) and the approximate area of Ile aux Fous (nonprotected, dotted line).
Figure 3. A in The den ecology and the effects of fishing pressure on the distribution of Octopus cyanea (Octopodidae: Mollusca) in Rodrigues lagoon, Rodrigues, Mauritius
Figure 3. A schematic diagram of a transect set-up and the search path that was used for recording the octopus dens and the invertebrate benthos. The blue circle indicates the position of the painted rock, a marker to allow a second transect within 100 m of the first one to be measured. The dashed lines show the position of the outer tape measures which marked out the sample area, the small arrows show the direction each surveyor looked either side of the inner belt transect (2 m either side), the red lines show the position of the inner three transects that were used for recording, the long arrows show the direction each surveyor swam along each transect and the small numbers show the distance along the bottom tape measure that the three inner transects were placed.
Figure 5 in The den ecology and the effects of fishing pressure on the distribution of Octopus cyanea (Octopodidae: Mollusca) in Rodrigues lagoon, Rodrigues, Mauritius
Figure 5. Figure with the average plus standard error of the number of counted holes per region for the first sampling occasion (a) and the second sampling occasion(b). White = Area 1 (Ile aux Fous), stripes = Area 2 (Anse aux Anglais), black = Area 3 (Grand Bassin).
Figure 2. A in The den ecology and the effects of fishing pressure on the distribution of Octopus cyanea (Octopodidae: Mollusca) in Rodrigues lagoon, Rodrigues, Mauritius
Figure 2. A map of the 12 survey locations within the Rodrigues lagoon, with labels for each station number (square = stations 1A-1D, stars = stations 2A-2D, triangles = stations 3A-3D). The grey dashed line shows the edge of the fringing lagoon. The sites were chosen based on specific coral biotopes as determined during ground-truthing surveys (Turner and Chapman 2004) The location of the Shoals Rodrigues base centre is shown to illustrate that the sites were also chosen because of proximity to the base.
Figure 4 in The den ecology and the effects of fishing pressure on the distribution of Octopus cyanea (Octopodidae: Mollusca) in Rodrigues lagoon, Rodrigues, Mauritius
Figure 4. The total number of octopus observed per station in the lagoon over the course of two different sampling periods with a 23-day gap between sampling; 1 = Ile aux Fous (moderate fishing pressure), 2 = Anse aux Anglais (high fishing pressure) and 3 = Grand Bassin (low fishing pressure).
Octopus rubescens SPAdes preassembly
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Octopus rubescens decontaminated FSCR
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Population genomics of an Octopus species identify oceanographic barriers and inbreeding patterns: Demultiplexed reads of 71 Octopus insularis individuals
<p>Coastal marine ecosystems are highly productive and important for global fisheries. To mitigate over-exploitation and to establish efficient conservation management plans for species of economic interest, it is necessary to identify the oceanographic barriers that condition divergence and gene flow between populations with those species, and that determine their relative amounts of genetic variability. Here, we present the first population genomic study of an <em>Octopus</em> species, <em>Octopus</em> <em>insularis</em>, which was described in 2008 and is distributed in coastal and oceanic island habitats in the tropical Atlantic Ocean, Gulf of Mexico and the Caribbean Sea. Using genomic data, we identify the South Equatorial current as the main barrier to gene flow between southern and northern parts of the range, followed by discontinuities in the habitat associated with depth. We find that genetic diversity of insular populations significantly decreases after colonization from the continental shelf, also reflecting low habitat availability. Using demographic modelling, we find signatures of a stronger population expansion for coastal relative to insular populations, consistent with estimated increases in habitat availability since the Last Glacial Maximum. The direction of gene flow is coincident with unidirectional currents and bidirectional eddies between otherwise isolated populations. Together, our results show that oceanic currents and habitat breaks are determinant in the diversification of coastal marine species where adults have a sedentary behavior but paralarvae are dispersed passively, shaping standing genetic variability within populations. Lower genetic diversity within insular populations implies that these are particularly vulnerable to current human exploitation and selective pressures, calling for the revision of their protection status.</p>
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International Brain Laboratory public data
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OpenNeuro
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