Show simple item record

dc.contributor.authorPriest, Justin T.
dc.date.accessioned2021-10-22T17:30:43Z
dc.date.available2021-10-22T17:30:43Z
dc.date.issued2020-08
dc.identifier.urihttp://hdl.handle.net/11122/12318
dc.descriptionThesis (M.S.) University of Alaska Fairbanks, 2020en_US
dc.description.abstractEnvironmental conditions influence the presence, species composition, abundance, and growth of fish species in the nearshore Arctic ecosystem. With ongoing shifts in Arctic conditions due to climate change, how fish communities and individual species respond to such changes to environmental variability more broadly is unknown. This study analyzed catch and length data from a long-term fish monitoring project near Prudhoe Bay, Alaska, 2001-2018, to quantify the effects of environmental variables on the overall fish community and on the juveniles of two important whitefishes, Arctic Cisco Coregonus autumnalis and Broad Whitefish Coregonus nasus. Abundance data (n = 1.78 million fish) from daily sampling (July-August) at four stationary sampling locations showed distinct shifts in fish community metrics. Since 2001, annual species richness has significantly increased by one species per decade while water temperature warmed by over 1.4°C. The species composition based on biweekly catch data has significantly changed across years, with distinct variations among sample locations and throughout the season. Species composition was significantly affected by both salinity and water temperature. The effects of environmental conditions on growth showed that water temperature was positively and linearly associated with increases in growth for juvenile whitefish, while salinity negatively affected growth of age-0 Arctic Cisco. Changes in the abundance of juvenile whitefishes were related to both water temperature and salinity. Results from all analyses suggest that species positively associated with observed warming in the aquatic environment are generalist species such as Broad Whitefish. This study concluded that continued climate change, and especially Arctic warming, will likely increase growth, change the species composition, and alter abundance in the Arctic nearshore ecosystem. These changes will have impacts on subsistence harvests and on upper trophic level species that prey on nearshore fishes.en_US
dc.description.sponsorshipHilcorp Alaska, BP Exploration Alaska, University of Alaska Foundationen_US
dc.description.tableofcontentsGeneral introduction -- Chapter 1: Effects of environmental variables on a nearshore Arctic fish community, 2001-2018 -- Chapter 2: Effects of nearshore water temperature and salinity on the growth and abundance of two juvenile Arctic whitefishes -- General conclusion.en_US
dc.language.isoen_USen_US
dc.subjectMarine fishesen_US
dc.subjectEnvironmenten_US
dc.subjectAlaskaen_US
dc.subjectArctic Coasten_US
dc.subjectPrudhoe Bayen_US
dc.subjectWhitefishesen_US
dc.subjectArctic ciscoen_US
dc.subjectBroad whitefishen_US
dc.subject.otherMaster of Science in Fisheriesen_US
dc.titleLong-term shifts in community structure, growth, and relative abundance of nearshore Arctic fishes: a response to changing environmental conditionsen_US
dc.typeThesisen_US
dc.type.degreemsen_US
dc.identifier.departmentDepartment of Fisheriesen_US
dc.contributor.chairSutton, Trent M.
dc.contributor.committeeMueter, Franz J.
dc.contributor.committeeRaborn, Scott W.
refterms.dateFOA2021-10-22T17:30:44Z


Files in this item

Thumbnail
Name:
Priest_J_2020.pdf
Size:
3.960Mb
Format:
PDF

This item appears in the following Collection(s)

Show simple item record