2.50
Hdl Handle:
http://hdl.handle.net/10547/337116
Title:
Aspects of the biology of polar pycnogonids
Authors:
Richards, Peter Robin
Abstract:
The internal morphology of fixed specimens of Antarctic pycnogonids WDS examined. Theories postulated during the course of these histological studies were then tested and modified by observations on live material and specimens fixed specially for histochemistry on visits both to the Arctic and d Antarctic. Live material was also transported back to Britain from these regions and cultured in refrigerated marine aquaria. The digestive system was studied in considerable detail. It is suggested that digestion is intracellular with gut cells changing their morphology during their lifetime. Embryo cells develop into Absorptive cells which at some stage take up a glandular appearance but not a glandular function. There are therefore two gut cell types, 'Embryo' and 'Absorptive/glandular'; this is in disagreement with some previous authors who separate the latter. The rele of the gut cell in the light of present day lysosome theory is discussed and a re-interpretation of work by previous authors suggested. It is found that the digestive process is slow and the prey tastes of the species studied, catholic. Furthermore, it is found that some species can survive for long periods without appearing to feed. Suggestions are made as to the significance and mechanisms of these phenomena. Mass transport in the body cavities is considered flnd compared with that of Hydra, an animal with which previous authors have made comparisons; - their philosophy is questioned. Blood flow, heartbeat and intestine movements are also considered and suggestions for future studies made. The role of blood itself is studied a possible clotting system described. Preliminary experiments on blood electrophoresis and chromatography indicate that such techniques may be useful in clarifying some complexities of pycnogonid classification and might provide a means by which future workers in the field might better link nutritional state, mass transport, digestion and external environment conditions.
Citation:
Richards, P.R. (1976) 'Aspects of the biology of polar pycnogonids'. PhD thesis. Luton College of Technology.
Publisher:
University of Bedfordshire
Issue Date:
Oct-1976
URI:
http://hdl.handle.net/10547/337116
Type:
Thesis or dissertation
Language:
en
Description:
Submitted to the Council for National Academic Awards in fulfilment of the requirements for the degree of Doctor of Philosophy.
Appears in Collections:
PhD e-theses

Full metadata record

DC FieldValue Language
dc.contributor.authorRichards, Peter Robinen
dc.date.accessioned2014-12-12T11:39:04Z-
dc.date.available2014-12-12T11:39:04Z-
dc.date.issued1976-10-
dc.identifier.citationRichards, P.R. (1976) 'Aspects of the biology of polar pycnogonids'. PhD thesis. Luton College of Technology.en
dc.identifier.urihttp://hdl.handle.net/10547/337116-
dc.descriptionSubmitted to the Council for National Academic Awards in fulfilment of the requirements for the degree of Doctor of Philosophy.en
dc.description.abstractThe internal morphology of fixed specimens of Antarctic pycnogonids WDS examined. Theories postulated during the course of these histological studies were then tested and modified by observations on live material and specimens fixed specially for histochemistry on visits both to the Arctic and d Antarctic. Live material was also transported back to Britain from these regions and cultured in refrigerated marine aquaria. The digestive system was studied in considerable detail. It is suggested that digestion is intracellular with gut cells changing their morphology during their lifetime. Embryo cells develop into Absorptive cells which at some stage take up a glandular appearance but not a glandular function. There are therefore two gut cell types, 'Embryo' and 'Absorptive/glandular'; this is in disagreement with some previous authors who separate the latter. The rele of the gut cell in the light of present day lysosome theory is discussed and a re-interpretation of work by previous authors suggested. It is found that the digestive process is slow and the prey tastes of the species studied, catholic. Furthermore, it is found that some species can survive for long periods without appearing to feed. Suggestions are made as to the significance and mechanisms of these phenomena. Mass transport in the body cavities is considered flnd compared with that of Hydra, an animal with which previous authors have made comparisons; - their philosophy is questioned. Blood flow, heartbeat and intestine movements are also considered and suggestions for future studies made. The role of blood itself is studied a possible clotting system described. Preliminary experiments on blood electrophoresis and chromatography indicate that such techniques may be useful in clarifying some complexities of pycnogonid classification and might provide a means by which future workers in the field might better link nutritional state, mass transport, digestion and external environment conditions.en
dc.language.isoenen
dc.publisherUniversity of Bedfordshireen
dc.subjectC161 Marine Biologyen
dc.subjectAntarcticen
dc.subjectpycnogonidsen
dc.subjectArcticen
dc.subjectinternal morphologyen
dc.titleAspects of the biology of polar pycnogonidsen
dc.typeThesis or dissertationen
dc.type.qualificationnamePhDen_GB
dc.type.qualificationlevelPhDen
dc.publisher.institutionUniversity of Bedfordshireen
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