Patterns in the abundance of hyperbenthic zooplankton and colonization of marine benthic invertebrates on the seafloor of Saanich Inlet, a seasonally hypoxic fjord

Dinning, Kristin M.; Meta×as, Anna

doi:10.1111/j.1439-0485.2012.00517.x

Cited by 10 publications

(5 citation statements)

References 49 publications

(61 reference statements)

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“…Although hypoxia is known to alter composition by eliminating sensitive organisms while supporting the proliferation of a few tolerant species due to physiological, behavioral, and/or spatiotemporal recruitment adaptations (Dau er 1993), perhaps the large increase in the presence of tolerant organisms in this study was magnified by the reduction in the higher trophic level predators (i.e. fish) (Matabos et al 2012, Dinning & Metaxas 2013, Sperling et al 2013.…”

Section: Discussionmentioning

confidence: 84%

Spatial and temporal variation in nearshore macrofaunal community structure in a seasonally hypoxic estuary

Froehlich¹,

Hennessey²,

Essington³

et al. 2015

Mar. Ecol. Prog. Ser.

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Low dissolved oxygen (DO), or hypoxia, has emerged as a key threat to marine and estuarine ecosystems worldwide. While deep, offshore severe hypoxia (< 2 mg l −1 ) can cause mortality, the non-lethal impact of lower DO on the shallow nearshore (≤30 m) community is not well understood, despite the importance of the habitat for numerous species. We evaluated the sublethal influence of hypoxia on the nearshore, subtidal community of Hood Canal, Washington, USA, a seasonally hypoxic estuary. We compared 2 regions (southern impacted and northern reference) by using underwater monitoring to record weekly videos of benthic mobile species at transects at 3 depths (10, 20, and 30 m). We found the community composition was significantly different between the 2 regions; the south was primarily composed of hypoxia-tolerant invertebrates and fewer fish species compared to the northern site. Relative to other predictors, DO performed moderately well in describing the occurrence of the most abundant species. Additionally, tolerant species displayed almost a 3-fold increase in presence below a mean (± SE) DO tolerance threshold of 3.77 ± 0.27 mg l −1 , while more sensitive species declined. The magnitude in change towards more tolerant species was also greater in the south. Ultimately, comparing our findings to long-term DO trends in Hood Canal revealed the potential for a more persistent low DO state in the southern reaches. This study provides insight into the complex regional differences in community structure and potential sensitivity of nearshore communities to other perturbations in estuarine systems.

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Section: Discussionmentioning

confidence: 84%

Spatial and temporal variation in nearshore macrofaunal community structure in a seasonally hypoxic estuary

Froehlich¹,

Hennessey²,

Essington³

et al. 2015

Mar. Ecol. Prog. Ser.

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“…Bacterial mat, euphausiid swarms, chaetognath swarms, amphipod swarms, copepod swarms, worm tubes and settling phytoplankton blooms were recorded as presence–absence data. Plankton identity was confirmed from trapped individuals on the nearby VIP platform [ 45 ]. Species abundances were standardized to densities (individuals m −2 ) by pooling counts from both images at a time point and dividing by the combined area of the images (2.7 m 2 ) covered in the field of view.…”

Section: Methodsmentioning

confidence: 99%

Drivers of temporal beta diversity of a benthic community in a seasonally hypoxic fjord

2018

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Global expansion of oxygen-deficient (hypoxic) waters will have detrimental effects on marine life in the Northeast Pacific Ocean (NEP) where some of the largest proportional losses in aerobic habitat are predicted to occur. However, few in situ studies have accounted for the high environmental variability in this region while including natural community-assembly dynamics. Here, we present results from a 14-month deployment of a benthic camera platform tethered to the VENUS cabled observatory in the seasonally hypoxic Saanich Inlet. Our time series continuously recorded natural cycles of deoxygenation and reoxygenation that allowed us to test whether a community from the NEP showed hysteresis in its recovery compared to hypoxia-induced decline, and to address the processes driving temporal beta diversity under variable states of hypoxia. Using high-frequency ecological time series, we reveal (i) differences in the response and recovery of the epibenthic community are rate-limited by recovery of the sessile species assemblage; (ii) both environmental and biological processes influence community assembly patterns at multiple timescales; and (iii) interspecific processes can drive temporal beta diversity in seasonal hypoxia. Ultimately, our results illustrate how different timescale-dependent drivers can influence the response and recovery of a marine habitat under increasing stress from environmental change.

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“…While Saanich Inlet is a long-time, well-studied fjord, the VENUS observatory supports the investigation of small temporal scale processes. Therefore, recent research using this technology provided new insights in zooplankton ecology (Dinning and Metaxas 2012;Sato et al 2013), phytoplankton production (Price and Pospelova 2011), and nitrogen cycle (Manning et al 2010).…”

Section: Introductionmentioning

confidence: 99%

The VENUS cabled observatory as a method to observe fish behaviour and species assemblages in a hypoxic fjord, Saanich Inlet (British Columbia, Canada)

Matabos

Piechaud

MontignyFrançois

et al. 2015

Can. J. Fish. Aquat. Sci.

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Studies reporting processes that may shape marine benthic communities under the seasonal scale are rare at depths >50 m. In this study, the use of the VENUS multidisciplinary cabled observatory provided 2-month high-resolution data combining quantitative biology and environmental data in Saanich Inlet, a seasonally hypoxic fjord located on Vancouver Island (British Columbia, Canada). An ecological module equipped with a camera acquired a 3 min video clip every half hour during 2 months at 97 m depth in the oxygen fluctuation zone of the fjord. Results highlighted the role of the tidal cycle on species activity rhythms and confirmed the influence of oxygen fluctuations on benthic assemblage structure and species behaviour. However, environmental variables considered only explained a small proportion of the total variance in species data. This study demonstrates how seafloor observatories can be used to study species behaviour and community dynamics in relation to abiotic conditions by providing continuous access to multidisciplinary data. Résumé :Les études sur les processus qui influencent la structure des communautés marines benthiques profondes (>50 m) à des échelles inférieures aux saisons sont rares. Dans cet article, l'utilisation de l'observatoire multidisciplinaire câblé VENUS a fourni 2 mois de données haute fréquence combinant des données quantitatives biologiques et environnementales dans le Saanich Inlet, un fjord hypoxique saisonnier localisé sur l'île de Vancouver (Colombie-Britannique, Canada). Un module écologique a enregistré des séquences vidéo de 3 min toutes les demi-heures pendant 2 mois à 97 m de profondeur dans la zone de fluctuation d'oxygène. Les résultats ont permis de mettre en évidence le rôle des cycles de marées sur l'activité rythmique des espèces et ont confirmé le rôle des variations temporelles des concentrations en oxygène sur la structure des assemblages faunistiques et le comportement des espèces benthiques. Cependant, les variables environnementales considérées expliquent une faible proportion de la variance. Cette étude démontre comment les observatoires sous-marins permettent d'étudier le comportement des espèces et la dynamique des communautés benthiques en relation avec les facteurs abiotiques, en fournissant un accès continu à des données multidisciplinaires.

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Patterns in the abundance of hyperbenthic zooplankton and colonization of marine benthic invertebrates on the seafloor of Saanich Inlet, a seasonally hypoxic fjord

Cited by 10 publications

References 49 publications

Spatial and temporal variation in nearshore macrofaunal community structure in a seasonally hypoxic estuary

Spatial and temporal variation in nearshore macrofaunal community structure in a seasonally hypoxic estuary

Drivers of temporal beta diversity of a benthic community in a seasonally hypoxic fjord

The VENUS cabled observatory as a method to observe fish behaviour and species assemblages in a hypoxic fjord, Saanich Inlet (British Columbia, Canada)

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