Sex, Molecules, and Gene control : Ecophysiological and evolutionary aspects of key sponge species from Antarctic shallow waters and the deep sea
Very little is known about the ecophysiological aspects of Porifera (sponges) from Antarctica and North Atlantic, even though they are keystone components of these habitats. Being the earliest diverging metazoan lineage, sponges also play a fundamental role in our understanding of animal evolution....
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Uppsala universitet, Farmakognosi
2020
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ftuppsalauniv:oai:DiVA.org:uu-423108 2023-05-15T13:44:12+02:00 Sex, Molecules, and Gene control : Ecophysiological and evolutionary aspects of key sponge species from Antarctic shallow waters and the deep sea Koutsouveli, Vasiliki 2020 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-423108 eng eng Uppsala universitet, Farmakognosi Uppsala Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Pharmacy, 1651-6192 288 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-423108 urn:isbn:978-91-513-1059-6 info:eu-repo/semantics/openAccess Porifera Demospongiae Geodia spp Phakellia ventilabrum reproduction gametogenesis Antarctica deep sea sponge grounds histology molecular machinery electron microscopy RNA-seq proteomics lipidomics Natural Sciences Naturvetenskap Doctoral thesis, comprehensive summary info:eu-repo/semantics/doctoralThesis text 2020 ftuppsalauniv 2023-02-23T21:54:26Z Very little is known about the ecophysiological aspects of Porifera (sponges) from Antarctica and North Atlantic, even though they are keystone components of these habitats. Being the earliest diverging metazoan lineage, sponges also play a fundamental role in our understanding of animal evolution. The main focus of this thesis was to study several aspects of the reproduction of sponges from the Antarctic shallow waters and the North Atlantic deep-sea sponge grounds and to describe the molecular toolkit that regulates their gametogenesis from an evolutionary perspective. In paper I, the reproductive strategy of six demosponge species commonly found in the shallow waters of Antarctica was examined with histological analyses. All species were brooders and although they reproduced during similar periods of the year, differences in their reproductive strategies might have allowed their coexistence in a habitat with annual food limitation events and low temperature. In paper II, the reproductive strategy of five species of the genus Geodia, a keystone genus of boreo-arctic sponge grounds, was assessed with histological analyses. All species were gonochoristic and oviparous, reproducing during similar periods (1-2 cycles annually) and with a high reproductive effort. The abundant lipid yolk and bacterial symbionts in their oocytes might enhance embryonic survival in the water column. Slight differences in reproductive strategies among species indicate specific adaptations for their successful colonization. This is the most detailed description of the reproductive biology of deep-sea Geodia sponges, providing essential information for the design of adequate conservation strategies in these vulnerable areas. In paper III, the genes and proteins regulating the oogenesis and spermatogenesis of the same five Geodia spp. were identified with RNA-seq and proteomic analyses and it was concluded that the molecular toolkit behind the main stages of gametogenesis is conserved across Metazoa. This is the most comprehensive ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Antarctica Arctic North Atlantic Uppsala University: Publications (DiVA) Antarctic Arctic The Antarctic |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
Porifera Demospongiae Geodia spp Phakellia ventilabrum reproduction gametogenesis Antarctica deep sea sponge grounds histology molecular machinery electron microscopy RNA-seq proteomics lipidomics Natural Sciences Naturvetenskap |
spellingShingle |
Porifera Demospongiae Geodia spp Phakellia ventilabrum reproduction gametogenesis Antarctica deep sea sponge grounds histology molecular machinery electron microscopy RNA-seq proteomics lipidomics Natural Sciences Naturvetenskap Koutsouveli, Vasiliki Sex, Molecules, and Gene control : Ecophysiological and evolutionary aspects of key sponge species from Antarctic shallow waters and the deep sea |
topic_facet |
Porifera Demospongiae Geodia spp Phakellia ventilabrum reproduction gametogenesis Antarctica deep sea sponge grounds histology molecular machinery electron microscopy RNA-seq proteomics lipidomics Natural Sciences Naturvetenskap |
description |
Very little is known about the ecophysiological aspects of Porifera (sponges) from Antarctica and North Atlantic, even though they are keystone components of these habitats. Being the earliest diverging metazoan lineage, sponges also play a fundamental role in our understanding of animal evolution. The main focus of this thesis was to study several aspects of the reproduction of sponges from the Antarctic shallow waters and the North Atlantic deep-sea sponge grounds and to describe the molecular toolkit that regulates their gametogenesis from an evolutionary perspective. In paper I, the reproductive strategy of six demosponge species commonly found in the shallow waters of Antarctica was examined with histological analyses. All species were brooders and although they reproduced during similar periods of the year, differences in their reproductive strategies might have allowed their coexistence in a habitat with annual food limitation events and low temperature. In paper II, the reproductive strategy of five species of the genus Geodia, a keystone genus of boreo-arctic sponge grounds, was assessed with histological analyses. All species were gonochoristic and oviparous, reproducing during similar periods (1-2 cycles annually) and with a high reproductive effort. The abundant lipid yolk and bacterial symbionts in their oocytes might enhance embryonic survival in the water column. Slight differences in reproductive strategies among species indicate specific adaptations for their successful colonization. This is the most detailed description of the reproductive biology of deep-sea Geodia sponges, providing essential information for the design of adequate conservation strategies in these vulnerable areas. In paper III, the genes and proteins regulating the oogenesis and spermatogenesis of the same five Geodia spp. were identified with RNA-seq and proteomic analyses and it was concluded that the molecular toolkit behind the main stages of gametogenesis is conserved across Metazoa. This is the most comprehensive ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Koutsouveli, Vasiliki |
author_facet |
Koutsouveli, Vasiliki |
author_sort |
Koutsouveli, Vasiliki |
title |
Sex, Molecules, and Gene control : Ecophysiological and evolutionary aspects of key sponge species from Antarctic shallow waters and the deep sea |
title_short |
Sex, Molecules, and Gene control : Ecophysiological and evolutionary aspects of key sponge species from Antarctic shallow waters and the deep sea |
title_full |
Sex, Molecules, and Gene control : Ecophysiological and evolutionary aspects of key sponge species from Antarctic shallow waters and the deep sea |
title_fullStr |
Sex, Molecules, and Gene control : Ecophysiological and evolutionary aspects of key sponge species from Antarctic shallow waters and the deep sea |
title_full_unstemmed |
Sex, Molecules, and Gene control : Ecophysiological and evolutionary aspects of key sponge species from Antarctic shallow waters and the deep sea |
title_sort |
sex, molecules, and gene control : ecophysiological and evolutionary aspects of key sponge species from antarctic shallow waters and the deep sea |
publisher |
Uppsala universitet, Farmakognosi |
publishDate |
2020 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-423108 |
geographic |
Antarctic Arctic The Antarctic |
geographic_facet |
Antarctic Arctic The Antarctic |
genre |
Antarc* Antarctic Antarctica Arctic North Atlantic |
genre_facet |
Antarc* Antarctic Antarctica Arctic North Atlantic |
op_relation |
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Pharmacy, 1651-6192 288 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-423108 urn:isbn:978-91-513-1059-6 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766198776659181568 |