Habitat structure, degradation and management effects on coral reef fish communities

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Yahya, Saleh A.S.1972-Stockholms universitet,Zoologiska institutionen (author)

Habitat structure, degradation and management effects on coral reef fish communities

BookEnglish2011

Publisher, publication year, extent ...

Stockholm :Department of Zoology, Stockholm University,2011
46 s.
electronicrdacarrier

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LIBRIS-ID:oai:DiVA.org:su-62187
ISBN:9789174473605
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-62187URI

Supplementary language notes

Language:English
Summary in:English

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SwePubSwePub

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Subject category:vet swepub-contenttype
Subject category:dok swepub-publicationtype

Notes

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 4: Manuscript.
Coral reefs are among the most diverse and productive ecosystems on earth, and are critical to the survival of tropical marine ecosystems and sustenance of local human populations. However, coral reefs are quite vulnerable to disturbances, both natural and anthropogenic. This thesis looks at how coral reef communities have responded to climactic disturbances, particularly the 1997-98 El Niño Southern Oscillation (ENSO) and subsequent coral bleaching and mortality that affected much of the Indian Ocean, including the coastal waters of Tanzania, where the study was conducted. In particular, it investigates the effects of coral bleaching, habitat degradation and reef spatial arrangement on reef fish assemblages. Habitat structural complexity and spatial arrangement of reefs had an effect on reef fish communities. Fish communities showed patterns in distribution among habitats and between patch and continuous reefs. Fishes preferred live to bleached/dead or eroded coral, but trophic groups reacted differently to patch and continuous reefs. There were slight changes in fish abundance and significant changes in fish diversity on experimental, bleached branching Acropora coral plots over a period of one year. While fish abundance on one site increased shortly after a bleaching event, 6 years later fish abundance had decreased significantly. Conversely, coral reef communities in northern Tanzania had changed little over an 8-year period, with minor changes associated with the 1997-98 ENSO and the presence or absence of fisheries management. The coral reefs in the region were found to show high variability in community structure and responses of associated fish and invertebrate communities. The findings of this thesis indicate the importance of habitat structure and spatial arrangement of reefs, the detrimental effects of coral bleaching, and the possibility that some reefs and some (generalist) reef fish taxa may exhibit resilience to climate change.

Subject headings and genre

NATURVETENSKAP Biologi Ekologi hsv//swe
NATURAL SCIENCES Biological Sciences Ecology hsv//eng
NATURVETENSKAP Biologi Zoologi hsv//swe
NATURAL SCIENCES Biological Sciences Zoology hsv//eng
fish assemblages
climate change
coral degradation
Indian Ocean
patch reefs
coral bleaching
resilience
zoologisk ekologi
Animal Ecology

Added entries (persons, corporate bodies, meetings, titles ...)

Gullström, Martin,DrStockholms universitet,Zoologiska institutionen (thesis advisor)
Nylin, Sören,ProfessorStockholms universitet,Zoologiska institutionen (thesis advisor)
Jiddawi, Narriman,DrUniversity of Dar es Salaam (thesis advisor)
Mgaya, Yunus,ProfessorUniversity of Dar es Salaam (thesis advisor)
Rosenqvist, Gunilla,ProfessorNorwegian University of Science and Technology (NTNU), Department of Biology (opponent)
Stockholms universitetZoologiska institutionen (creator_code:org_t)

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NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Ecology

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