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119 results for “Southeastern Pacific”
Lagrangian trajectories tracking the origin and fate of a hydrothermal plume observed in the southeastern Pacific sector of the Southern Ocean
<p>A dataset of Lagrangian trajectories which were used to estimate the origin and fate of a hydrothermal plume in the southeastern Pacific sector of the Southern Ocean observed during the DY111 CUSTARD cruise. All variables have long names and units. These files have been used for the analysis in Birchill and Baker et al. ‘Pathways and timescales of Southern Ocean hydrothermal iron and manganese transport’ with further information about the methodology available in the paper. There are five forward-tracking experiments from suspected vent sites (CUSTARD_NEPR.nc, CUSTARD_SEPR.nc, CUSTARD_PAR.nc, CUSTARD_WCR.nc and CUSTARD_ECR.nc) included in the paper and one forward-tracking experiment that was not included in the paper (CUSTARD_EM.nc) as no trajectories crossed our sampling site. There was one backward-tracking experiment undertaken from the Ocean Observatories Initiative (OOI) station at which the hydrothermal signal was observed (CUSTARD_OOI_backward.nc).</p>
Population genomic analyses reveal hybridization and marked differences in genetic structure and demographic history of Scurria limpet sister species with parapatric distributions across the southeastern pacific
<p>The study of sister species that occur in parapatry around biogeographic transition zones can help understand the evolutionary processes that underlie the changes in species composition across biogeographic transition zones. The South Eastern Pacific (SEP) coast is a highly productive coastal system that exhibits a broad biogeographic transition zone around 30–35ºS. Here, we present a comparative genome-wide analysis of the sister species <em>Scurria viridula</em> and <em>Scurria zebrina</em>, that occur in parapatry and whose poleward and equatorward range edges intersect in the 30–35ºS SEP biogeographic transition zone. We sampled 118 specimens sourced from nine sites from Tocopilla (22ºS) to Chiloé (41ºS) including one site where both species overlap and analyzed over 8,000 biallelic single nucleotide polymorphisms. We found evidence of hybridization between these species in the contact zone and found significant but contrasting population structures for both species. Our results indicate that the genetic structure in <em>S. viridula</em>, which is currently expanding its range poleward, follows a simple isolation-by-distance model with no traces of natural selection (no evidence of outlier loci). In contrast, <em>S. zebrina</em>, which finds its equatorward range edge at the transition zone, displayed a pronounced genetic break approximately at 32-34ºS, along a region of marked environmental heterogeneity in association with a semi-permanent coastal upwelling regime. For <em>S. zebrina</em>, we also found 43 outlier loci associated with this genetic break, with a significant proportion of them clustering in a single linkage group. This marked difference in the presence of outlier loci between species suggests that they could be responding differently to local environmental challenges found at their overlapping geographic range edges, thus providing important new insights about genomic changes around biogeographic transition zones in sister species and the forces that shape genetic diversity in intertidal marine species. </p>
Strong nuclear and mitochondrial genetic structure of <em>Mazzaella laminarioides</em> in the southeastern Pacific revealed by intensive sampling
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Body size variation in polyplacophoran mollusks: geographic clines and community structure along the Southeastern Pacific
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Population genomic analyses reveal hybridization and marked differences in genetic structure and demographic history of Scurria limpet sister species with parapatric distributions across the southeastern pacific
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Pinpointing genetic breaks in the southeastern Pacific: phylogeography and genetic structure of Pyura chilensis, a commercially important tunicate
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The role of island physiography and oceanographic factors in shaping species richness and turnover of nesting seabird assemblages on islands across the southeastern Pacific
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FIGURE 6 in A new species of Eunice Cuvier, 1817 (Polychaeta: Eunicidae) from the slope of the Desventuradas Islands and seamounts of the Nazca Ridge, southeastern Pacific Ocean
FIGURE 6. Different habitats (S22, SF9 and SFX) for Eunice decolorhami n. sp. a) habitat at S22 with predominance of fine sand; b, c) bottom at SF9 and SFX, dominated by coarse calcareous sediments produced by foraminiferous tests, debris of deepsea corals, holopelagic gastropod shells and rhodoliths, with scattered rocky outcrops.
FIGURE 1 in A new species of Eunice Cuvier, 1817 (Polychaeta: Eunicidae) from the slope of the Desventuradas Islands and seamounts of the Nazca Ridge, southeastern Pacific Ocean
FIGURE 1. Location of the stations sampled between 22 October and 1 November 2016 in the CIMAR 22 cruise. Red triangles represent the collection points of the material examined. (Credits: Ariadna Mecho (ESMOI)).
FIGURE 4. Eunice decolorhami n in A new species of Eunice Cuvier, 1817 (Polychaeta: Eunicidae) from the slope of the Desventuradas Islands and seamounts of the Nazca Ridge, southeastern Pacific Ocean
FIGURE 4. Eunice decolorhami n. sp.: a) anterior end, lateral view (paratype SCBUCN 6856); b) chaetiger 3, anterior view (AV); c) chaetiger 8, AV; d) chaetiger 36, AV (paratype); e) chaetiger 48, AV; f) posterior chaetiger, near posterior end, PV; g) limbate chaeta; h) pectinate chaeta; i) falciger chaeta; j) aciculum; k, l) anterior hooded hooks; m) middle hooded hook; n) posterior hooded hook; o) maxillary complex.
FIGURE 2. Eunice decolohami n in A new species of Eunice Cuvier, 1817 (Polychaeta: Eunicidae) from the slope of the Desventuradas Islands and seamounts of the Nazca Ridge, southeastern Pacific Ocean
FIGURE 2. Eunice decolohami n. sp.: a) anterior end, dorsal view (paratype MNHNCL ANN-15036); b) same, ventral view; c) anterior end, lateral view (holotype); d) chaetigers 7–8 (holotype); e) chaetiger 15, posterior view (paratype MNHNCL ANN- 15036); f) chaetiger 36, anterior view (paratype MNHNCL ANN-15036); g) chaetiger 80, anterior view (paratype MNHNCL ANN-15036); h) falciger chaeta; i) pectinate chaeta; j) subacicular hooded hook, lateral view; j´) same, frontal view; k) pygidium, dorsal view (paratype MNHNCL ANN-15036).
Data from: Heterogeneity of ecological patterns, processes and funding of marine manipulative field experiments conducted in Southeastern Pacific coastal ecosystems
Ecological manipulative experiments conducted in marine coastal ecosystems have substantially improved ecological theory during the last decades, and have provided useful knowledge for the management and conservation of coastal ecosystems. Although different studies report global trends in ecological patterns worldwide, Southeastern Pacific coastal ecosystems have been poorly considered. Given that the SE Pacific coast encompasses diverse coastal ecosystems, consideration of studies conducted along this range can shed light on the heterogeneity of processes regulating coastal communities. We reviewed the biotic interactions and habitat type considered, as well as the complexity in terms of spatial and temporal extent of manipulative field experimental studies conducted along the SE Pacific coast from 0°S to 56° S (Ecuador to Chile). We test the effect of funding reported by different studies as a main factor limiting experimental complexity. From field ecological studies published from 1970 to 2016, we found that 81 studies were truly manipulative, in which one or multiple factors were "manipulated". Around 77% of these studies were located between 21°S to 40°S, and conducted in intertidal rocky habitats. An increase in experimental studies was observed between 2010 and 2015, especially focused on herbivore-alga interactions, although we found that both the temporal and spatial extent of these studies have shown a decrease in recent decades. Funding grant amount reported had a positive effect on elapsed time of field experiments, but no effect was observed on spatial extent or in the biotic interactions considered. Elapsed time of experiments was different among the main biotic interactions considered i.e. herbivory, predation, and competition. We suggest that to further progress in applied ecological knowledge, it will be necessary to consider pollution and urbanization processes explicitly using a field experimental framework. This information could improve our understanding of how ecosystems present along the SE Pacific coast respond to climate change and increased levels of human interventions.
Data from: Contrasting definitive hosts as determinants of the genetic structure in a parasite with complex life cycle along the Southeastern Pacific
The spatial genetic structure (and gene flow) of parasites with complex life cycles, such as digeneans, has been attributed mainly to the dispersion ability of the most mobile host, which most often corresponds to the definitive host (DH). In this study, we compared the genetic structure and diversity of adult Neolebouria georgenascimentoi in two fish species (DHs) that are extensively distributed along the Southeastern Pacific (SEP). The analysis was based on the cytochrome oxidase subunit I gene sequences of parasites collected between 23°S and 45°S. In total, 202 sequences of N. georgenascimentoi in Pinguipes chilensis isolated from 9 sites and 136 sequences of Prolatilus jugularis from 5 sites were analyzed. Our results showed that N. georgenascimentoi is a species complex that includes three different parasite species; however, in this study, only group 1 and 2 found in P. chilensis and P. jugularis, respectively, were studied because they are widely distributed along the coastline. Group 1 parasites had two common haplotypes with wide distribution and unique haplotypes in northern sites. Group 2 had only one common haplotype with wide distribution and a large number of unique haplotypes with greater genetic diversity. Both groups have experienced recent population expansion. Only group 1 exhibited a genetic structure that was mainly associated with a biogeographic break at approximately 30°S along the SEP. Our finding suggests that host access to different prey (=intermediate hosts) could affect the genetic structure of the parasite complex discovered here. Consequently, difference between these patterns suggests that factors other than DH dispersal are involved in the genetic structure of autogenic parasites.
FIGURE 2 in A review of the Hexactinellida (Porifera) of Chile, with the first record of Caulophacus Schulze, 1885 (Lyssacinosida: Rossellidae) from the Southeastern Pacific Ocean
FIGURE 2. Caulophacus chilense sp. nov. spicules. A. Three dermal pinules including two normal hexactine forms and one uncommon pentactine form (all pinules to same scale). B. Two atrial hexactine pinules. C. A choanosome diactin, whole and enlargements of the tip and center. D. Hypodermal pentactin, whole and enlarged tangential ray end. E. Two whole hypoatrial pentactins showing different lengths of proximal rays, and enlargements of the ray ends. F. Choanosomal hexactin, whole and enlargement of a ray end and the coarsely spined central area. G. Discohexactin and enlarged ray end (all whole microscleres at same scale). H. Hemidiscohexaster. I. Discohexaster A. J. Small thin-rayed discohexaster B shown from LM since this form was not encountered in SEM surveys.
FIGURE 1 in A review of the Hexactinellida (Porifera) of Chile, with the first record of Caulophacus Schulze, 1885 (Lyssacinosida: Rossellidae) from the Southeastern Pacific Ocean
FIGURE 1. Caulophacus chilense sp. nov. A. The holotype, dried. B. The upper body. C. Surface of the atrial or top surface. D. Close-up image of the irregular atrial lattice. E. Surface of the derma or lower body surface with radiating subdermal strands of diactins. F. Close-up of the more regular dermal lattice of pinular hexactins supported by a coarser lattice of hypodermal pentactins.
FIGURE 13 in A review of the Munidopsidae Ortmann, 1898 (Decapoda, Galatheoidea) in Chilean waters, including new records for the Southeastern Pacific
FIGURE 13. Graphical representation of the distribution of the Chilean Munidopsis species reported here. Dots represent the approximate latitudinal locality of material collected by different authors detailed in the text. Vertical lines represent the overall estimated latitudinal range of the species in the southeastern Pacific. Not to scale, intended for didactic use.
FIGURE 12. Munidopsis villosa chilensis Bahamonde, 1964 in A review of the Munidopsidae Ortmann, 1898 (Decapoda, Galatheoidea) in Chilean waters, including new records for the Southeastern Pacific
FIGURE 12. Munidopsis villosa chilensis Bahamonde, 1964, paratype female, 44 mm cl, MNHNS 10064. a; anterior region of carapace, b; lateral view of entire animal; c, right cheliped; d, dorsal view of entire animal; e, telson. Scale = 1 mm.
FIGURE 10. Munidopsis tanneri Faxon, 1893 in A review of the Munidopsidae Ortmann, 1898 (Decapoda, Galatheoidea) in Chilean waters, including new records for the Southeastern Pacific
FIGURE 10. Munidopsis tanneri Faxon, 1893. Male cl 21.20 mm (a–e), MUAP(CD)-0175, (f–g), male cl 21.44 mm. a, anterior region of carapace; b, lateral view of carapace; c, lateral view of first five abdominal somites; d, left cheliped; e, third pereiopod, with detail of dactyl; f, left cheliped, g carpus of left cheliped. Scale = 1 mm.
FIGURE 11. Munidopsis trifida Henderson, 1888 in A review of the Munidopsidae Ortmann, 1898 (Decapoda, Galatheoidea) in Chilean waters, including new records for the Southeastern Pacific
FIGURE 11. Munidopsis trifida Henderson, 1888. (a–g), MUAP(CD)-0341 Male cl 17.75 mm, (h) MUAP(CD)-0471, male cl 12.06 mm. a, anterior region of carapace; b, lateral view of carapace; c, lateral view of abdomen; d, right cheliped; e, carpus and merus of right cheliped; f, third left pereiopod; g, detail of carpus of third pereiopod; h, right cheliped. Scale = 1 mm.
FIGURE 9. Munidopsis subsquamosa Henderson, 1888 in A review of the Munidopsidae Ortmann, 1898 (Decapoda, Galatheoidea) in Chilean waters, including new records for the Southeastern Pacific
FIGURE 9. Munidopsis subsquamosa Henderson, 1888, ovigerous female cl 18.28 mm, MUAP(CD)-0468: a, anterior region of carapace; b, lateral view of carapace; c, lateral view of abdomen; d, left cheliped; e, carpus and merus of left cheliped; f, third left pereiopod; g, dactyl of third pereiopod; h, detail of ventrodistal spine of propodus of third pereiopod. Scale = 1 mm.
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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.