Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 32 for “"Echinoderms"”.
-
Post-larval development in deep-sea echinoderms
… ontogenesis of thirty species of deep-sea echinoderms, belonging to three classes (Ophiuroidea, Asteroidea and Echinoidea), is described using scanning electron microscopy. The life history of Ophiocten gracilis is also examined as a case study for future research on post-larval organisms. …
-
Palaeobiology of Palaeozoic medusiform stem group echinoderms.
The morphological details of both external and internal anatomy of a group of Palaeozoic fossil medusiform animals are described with the aid of text-figures and plates with explanatory drawings. This fossil group had a worldwide distribution with a stratigraphic range from the Lower Cambrian to …
-
Towards Deep-Sea Toxicology: Experimental Approaches With Echinoderms
… to<br/>contamination and disturbance. Echinoderms are integral components of deep-sea benthic<br/>communities and, by virtue of their abundance, they contribute significantly to deep-sea<br/>biogeochemical processes. As such, echinoderms can be considered relevant target organisms …
-
A revision of helicoplacoids and other early Cambrian echinoderms of North America
… contain the remains of several species of echinoderms, including helicoplacoids, the eocrinoids Gogia, Lepidocystis, and Kinzercystis, and the edrioasteroids Camptostroma and Stromatocystites. Camptostroma roddyi Ruedemann, 1933 is a large echinoderm from the Lower Cambrian Kinzers …
-
Multiscale Structures and Mechanics of Biomineralized Lattices in Hexactinellid sponges and Echinoderms
… marine animals (i.e., Hexactinellid sponges and Echinoderms) for systematic structural-mechanical study. Their biomineralized lattice skeletons exhibit three representative types of multiscale structures: 1) multiscale hierarchical structure: skeleton of Hexactinellid sponge such as Euplectella …
-
Evaluating the resilience of Antarctic echinoderms to Southern Ocean freshening: Short- and long-term responses
… to have poor osmoregulatory abilities, such as echinoderms which are strictly marine with no known freshwater species. In Antarctica, echinoderms are highly abundant and conspicuous, making up around 10‰ of benthic fauna. Many are endemic to Antarctica, having adapted to the low, stable …
-
Eocrinoidní ostnokožci ze středního kambria barrandienské oblasti
This thesis deals with the topic of eocrinoid echinoderms from the Barrandian area (Příbram- Jince Basin, mid-Cambrian, Drumian). The thesis is presented as a compilation of five published papers and an introduction. The introduction is an overview of current knowledge about eocrinoid echinoderms. …
-
Bioinformatics and Mass Spectrometry for Neuropeptide Characterization
… neuropeptide genes and gene products in insect, echinoderms and chordates along with neuropeptide processing predictors present generalized and successful approaches for neuropeptide discovery in any organism.
-
Ancient origins of the chordate forebrain: Conserved patterning of the anterior neuroectoderm in amphioxus
… the two non-chordate deuterostome phyla (echinoderms and hemichordates), in which the aGRN controls the development of the apical organ. Although clear homologs of the apical organ are not present in chordates, most aGRN genes are expressed in the vertebrate forebrain. In this PhD thesis I …
-
Keanekaragaman jenis echinodermata di Pantai Kondang Merak Kecamatan Donomulyo Kabupaten Malang
… him, both in the form of plants or animals. Echinoderms is one of the most important animals in the marine ecosystem of the coral reef and especially useful as one component in the food chain, is eating detritus and other small animals. Kondang Merak beach is a beach on the south coast of …
-
Nutritional limitation in populations of the Norway lobster, Nephrops norvegicus (L.) in the Firth of Clyde, Scotland
… molluscs, and to a lesser extent polychaetes and echinoderms. The proportion of bivalves was higher in the diet of N. norvegicus from south of Little Cumbrae than in the diet of N. norvegicus from south of Ailsa Craig which contained larger proportions of crustaceans and echinoderms. This appears …
-
Reproductive success in Antarctic marine invertebrates
… members of the Antarctic benthos. Three common echinoderms and one nemertean were sampled from sites adjacent to the British Antarctic Survey’s Rothera Research Station, Adelaide Island, on the West Antarctic Peninsula between 1997-2001. Reproductive patterns were determined by histological …
-
Novel Mechanisms in Zebrafish Otolith Nucleation, Tethering, and Dysfunction
… of biomineralization events in chordates and echinoderms, I demonstrate that it is evolutionarily conserved in zebrafish. The role and function of vertebrate Otolin-1 has been expanded by the characterization of hair-cell specific otolin-1b. Finally, I provide the groundwork for future studies …
-
The feeding ecology of deposit-feeding holothurians
The class Holothuroidea includes some 1200 echinoderms divided into six orders: Apodida, Aspidochirotida, Dactlyochirotida, Dendrochirotida, Elasipodida and Molpadiida.<br/><br/>With the exception of the apodids, holothurians typically have 5 ambulacral rows of tube feet. Modification and/or …
-
The palaeoenvironments and stratigraphy of the Lincolnshire Limestone Formation (Middle Jurassic: Bajocian) of Northamptonshire and southern Lincolnshire
… bryozoa, rare brachiopods and fragmentary echinoderms) has been recorded from several horizons within the complex stratigraphy sampled at Cowthick, three horizons at Clipsham, three of eight samples at Copper Hill, but is not known from Brauncewell. A low diversity microfauna of ostracods …
-
Microfacies analysis of the lower paleocene beda formation in Western Concession 59 and Block 59F, Sirte Basin, Libya /
… to dasycladacean algae, ostracods, molluscs, echinoderms, bryozoans and charophytes. Fecal pellets and pelloids, along with the biotic allochems, contributed greatly to the composition of the various microfacies. Dolomite, where present, is finely crystalline and an early replacement product. …
-
Taphonomy, palaeoecology and taxonomy of an ophiuroid-stylophoran obrution deposit from the Lower Devonian Bokkeveld Group, South Africa
… the admixture of skeletal debris and intact echinoderms present in the Karbonaatjies obrution bed reflects a complex history with significant time-averaging. This unique assemblage provides a taphonomic window into the marine ecosystems of the Early Devonian, including the structure of an …
-
Sexual biochemistry in the deep sea – the link between phytoplankton and abyssal holothurians
… carotenoid concentration in the ovaries of echinoderms increases reproductive output and larval survival. Carotenoids cannot be synthesised de novo by holothurians, only by phytoplankton. To examine the link between diet and reproduction in deep-sea holothurians, the pigment biochemistry of …
-
Ecotoxicological assessment of galaxolide and tonalide as contaminants of emerging concern in marine ecosystems
… from different trophic levels like microalgae, echinoderms, bivalves, shrimps, and fish. This diversification in the species allows assessing how organisms with different biological complexity can be affected. In addition, different endpoints were used for each species, taking as basis the …
-
Sequence Stratigraphy of Middle-Mississippian Carbonates of the Southern Appalachians: Tuscumbia Limestone, Tuscumbia, AL
… a spicule-rich mud facies (F3) with echinoderms (0-37%), sponge spicules (3-30%), silt grains (0- 25%), and solenoporoid algae (< 1%) between 0.25-4.75 meters in thickness was described. In outcrop, F3 exhibits mound-shaped geometry. Based on these observations, the F3 exposures of …
Page 1 of 2