1,721,592 research outputs found
Movie S1 Stomatopod collapse Klompmaker et al 2017
No full textMovie S1 Stomatopod collapse Klompmaker et al 201
Table S1. metadata full experiment Klompmaker et al 2017
No full textTable S1. metadata full experiment Klompmaker et al 201
Table S3. Full experiment data. Klompmaker et al 2017 final
No full textTable S3. Full experiment data. Klompmaker et al 2017 fina
Table S2. Measurements specimens. Klompmaker et al 2017
No full textTable S2. Measurements specimens. Klompmaker et al 201
Geovõrgud sidumata kihtides – projekteerimine ja toimivus
No full textJörg Klompmaker, BBG Bauberatung Geokunststoffe GmbH & Co. (Saksamaa, ettekanne ingliskeelne
Seasonal NDVI by year and ZIP code
No full textWe used Landsat 7 (Collection 1 Tier 1 DN values, representing scaled, calibrated at sensor radiance) and 8 (Collection 1 Tier 1 Operational Land Imager DN values, representing scaled, calibrated at sensor radiance) images for the entire US. Landsat 7 and 8 images are generated every 16 days at 30m resolution. Landsat images were used from 2000 till winter 2013, Landsat 8 images were used from spring 2013. We created cloud-free Landsat composites for the winter (December-February), spring (March-May), summer (June-August) and fall (September-November) for the years 2000-2016 using GEE (function ee.Algorithms.Landsat.simpleComposite). We calculated spatially weighted average NDVI values for each zip code in the US, after setting negative NDVI values to zero
Predator–prey interactions based on drillholes: a case study of turritelline gastropods from the Pleistocene Szekou Formation of Taiwan
No full textDrillholes on shells provide a useful way to investigate prey and predator relationships. The current study documents predator–prey interactions exemplified by a faunal assemblage of the fossil gastropod Turritella cingulifera from the Pleistocene Szekou Formation in Hengchun Peninsula, Taiwan. All recognisable skeletal and shell fragments that are larger than 3 mm in size were collected and recorded. Processed bulk sediments (5.24 kg) contained 1462 molluscan shells, including 824 specimens of T. cingulifera, and 27 non-molluscan invertebrates. In the current study, approximately 41.6% (609/1462) of molluscs are drilled with at least one hole. Drilling intensities (DIs) regardless of shell completeness in all gastropods, bivalves and the turritelline gastropod T. cingulifera are 0.546, 0.060 and 0.413, respectively. DI on turritellids is significantly lower than that on other gastropods (χ2= 21.039, P < 0.001). Furthermore, the percentage of drillholes that occur in multiply drilled specimens is 34.7% (95/275) for turritelline gastropods based on complete to nearly complete specimens (n = 588). Our study shows no significant preference of drillhole position either on the suture or on the whorl (χ2= 0.055, P = 0.814). Most drillholes are located in whorls two to four proximal to the aperture. Drillhole diameters of the shells with one drillhole and ones with multiple drillholes are 1.0 and 0.5 mm on average, and the results of Mann–Whitney tests indicate that they are significantly different (P < 0.001). The first turritelline gastropod shell with an incomplete drillhole from Taiwan is documented here. The dominant drilling predators were naticids based on the drillhole morphology and the presence of naticids in the same assemblage. No apparent prey size selectivity is observed, so a ‘size refugium’ does not exist for the turritellids in the current study
Systematics, phylogeny, and taphonomy of ghost shrimps (Decapoda): a perspective from the fossil record
No full textGhost shrimps of Callianassidae and Ctenochelidae are soft-bodied, usually heterochelous decapods representing major bioturbators of muddy and sandy (sub)marine substrates. Ghost shrimps have a robust fossil record spanning from the Early Cretaceous (~ 133 Ma) to the Holocene and their remains are present in most assemblages of Cenozoic decapod crustaceans. Their taxonomic interpretation is in flux, mainly because the generic assignment is hindered by their insufficient preservation and disagreement in the biological classification. Furthermore, numerous taxa are incorrectly classified within the catch-all taxon Callianassa. To show the historical patterns in describing fossil ghost shrimps and to evaluate taphonomic aspects influencing the attribution of ghost shrimp remains to higher level taxa, a database of all fossil species treated at some time as belonging to the group has been compiled: 250 / 274 species are considered valid ghost shrimp taxa herein. More than half of these taxa (160 species, 58.4%) are known only from distal cheliped elements, i.e., dactylus and / or propodus, due to the more calcified cuticle locally. Rarely, ghost shrimps are preserved in situ in burrows or in direct association with them, and several previously unpublished occurrences are reported herein. For generic assignment, fossil material should be compared to living species because many of them have modern relatives. Heterochely, intraspecific variation, ontogenetic changes and sexual dimorphism are all factors that have to be taken into account when working with fossil ghost shrimps. Distal elements are usually more variable than proximal ones. Preliminary results suggest that the ghost shrimp clade emerged not before the Hauterivian (~ 133 Ma). The divergence of Ctenochelidae and Paracalliacinae is estimated to occur within the interval of Hauterivian to Albian (133–100 Ma). Callichirinae and Eucalliacinae likely diverged later during the Late Cretaceous (100–66 Ma), whereas Callianassinae did not appear before the Eocene (56 Ma)
- …
