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• W2775113313 abstract "The goal of this thesis was to detail spatial andtemporal organic particulate dynamics at an integratedmulti-trophic aquaculture (IMTA) site on the west coast ofVancouver Island, Canada. To accomplish this goal, in-situ opticalmeasurements of particulate scattering (bp), particulatebackscattering (bbp) and the particulate backscattering ratio(bbp:bp) were collected in conjunction with discrete sampling forparticulate organic carbon (POC) and chlorophyll a (chl a)concentrations. These measurements were performed over threeseasons (autumn, winter and summer) at reference sites and at siteswithin and directly adjacent to the fish component of the IMTAsystem. Chapter 2 of this thesis focused on the examination ofbio-optical relationships over various timescales (seasonally,daily and within-day) to describe temporal and vertical particulatevariability and to assess the effectiveness of bio-optical methodsfor environmental monitoring. Autumn showed low bio-opticalmagnitudes with distinct lower cage increases possibly attributableto aquaculture derived wastes. In spring, sampling was performedover diatom bloom conditions, dominating the bio-opticalmeasurements. During summer, an Emiliania Huxleyi bloom likelyoccurred, strongly enhancing bbp and bbp:bp magnitudes in thethermally stratified upper water column. Throughout theseconditions, bp was predominantly influenced by chl a suggestingsensitivity to phytoplankton concentrations. While bbp wasconditioned by chl a during the diatom bloom, it was also highlysensitive to the presence of inorganic and likely detritalmaterials. Finally, bbp:bp was sensitive to particulatecompositions, showing low values (< 0.010) in diatom dominatedwaters and high values when refractive coccoliths were likelypresent. Notably, in autumn, bbp:bp was conditioned by detritalparticles and along with bbp, showed post-feeding lower cageincreases suggesting that these parameters could be usefulcandidates for particulate waste tracking during low ambientparticle conditions. In chapter 3, the temporal, vertical andhorizontal dispersion of the aquaculture derived particulate wastesare detailed. Autumn was the only period to show waste signals,likely due to their quick dilution into the particulate rich fieldsin spring/summer. During this period, post-feeding particulatewaste increases were focused at the bottom of the cage withpossible vertical sinking towards the seafloor. Minimal horizontaldispersion towards the scallop portion of the system was observed;however, more comprehensive sampling over differing hydrographicregimes is necessary to characterize waste dispersion. Based on ourtemporally limited autumn results, the most appropriate placementof uptake species for waste assimilation would be directly belowthe studied cage. Our results highlight the need for highspatial and temporal resolution methods for particulate monitoringwithin IMTA settings as discrete sampling may miss “patchy” wastedispersal streams. The bio-optical measurements…" @default.
• W2775113313 created "2017-12-22" @default.
• W2775113313 creator A5080645344 @default.
• W2775113313 date "2014-01-01" @default.
• W2775113313 modified "2023-09-28" @default.
• W2775113313 title "Spatial and temporal particulate variability at an integrated multi-trophic aquaculture (IMTA) site in Kyuquot Sound, British Columbia, using bio-optical methods" @default.
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