Water age variability in a Patagonian fjord

Pinilla, Elías; Castillo, Manuel; Peréz-Santos, Iván; Venegas, Oliver; Valle‐Levinson, Arnoldo

doi:10.1016/j.jmarsys.2020.103376

Cited by 20 publications

(12 citation statements)

References 59 publications

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“…1C). Predominant southerly winds in summer have been found to force unidirectional northward currents (Pinilla et al, 2020). These observations are compatible with a possible wind-driven advection of the D. acuminata population observed the second day, coinciding with flood tide.…”

Section: Vertical Distribution Of Dinophysis Speciessupporting

confidence: 67%

Niche differentiation of Dinophysis acuta and D. acuminata in a stratified fjord

et al. 2021

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Dinophysis acuta and D. acuminata are associated with lipophilic toxins in Southern Chile. Blooms of the two species coincided during summer 2019 in a highly stratified fjord system (Puyuhuapi, Chilean Patagonia). High vertical resolution measurements of physical parameters were carried out during 48 h sampling to i) explore physiological status (e.g., division rates, toxin content) and ii) illustrate the fine scale distribution of D. acuta and D. acuminata populations with a focus on water column structure and cooccurring plastid-bearing ciliates. The species-specific resources and regulators defining the realized niches (sensu Hutchinson) of the two species were identified. Differences in vertical distribution, daily vertical migration and in situ division rates (with record values, 0.76 d−1, in D. acuta), in response to the environmental conditions and potential prey availability, revealed their niche differences. The Outlying Mean Index (OMI) analysis showed that the realized niche of D. acuta (cell maximum 7 × 103 cells L−1 within the pycnocline) was characterized by sub-surface estuarine waters (salinity 23 -25), lower values of turbulence and PAR, and a narrow niche breath. In contrast, the realized niche of D. acuminata (cell maximum 6.8 × 103 cells L−1 just above the pycnocline) was characterized by fresher (salinity 17 -20) outflowing surface waters, with higher turbulence and light intensity and a wider niche breadth. Results from OMI and PERMANOVA analyses of co-occurring microplanktonic ciliates were compatible with the hypothesis of species such as those from genera Pseudotontonia and Strombidium constituting an alternative ciliate prey to Mesodinium. The D. acuta cell maximum was associated with DSP (OA and Please note that this is an author-produced PDF of an article accepted for publication following peer review. The definitive publisher-authenticated version is available on the publisher Web site.DTX-1) toxins and pectenotoxins; that of D. acuminata only with pectenotoxins. Results presented here contribute to a better understanding of the environmental drivers of species-specific blooms of Dinophysis and management of their distinct effects in Southern Chile. Previous article Highlights► 48 h of high frequency physical data for co-occurring blooms of 2 Dinophysis species. ► D. acuta (exceptional µ) thin layer briefly disrupted by an increase in turbulence. ► Co-occurring D. acuminata and D. acuta blooms showed a clear niche differentiation. ► Niche analysis results compatible with putative ciliate prey other than Mesodinium. ► D. acuta maximum associated with DSP toxins (OA, DTX1), D. acuminata with PTX2 only.

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Section: Vertical Distribution Of Dinophysis Speciessupporting

confidence: 67%

Niche differentiation of Dinophysis acuta and D. acuminata in a stratified fjord

et al. 2021

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“…The other site was Yaldad (43°07′14.63′ ‘S– 73°44’25.72″W), in the southern part, a bay exposed to open sea influence. Seawater parameters of temperature (°C), currents (m/s), salinity (psu), and age of seawater (days) as an estimate of dissolved oxygen content ( Pinilla et al, 2020 ), were obtained for both locations between June 2017 and May 2018 (0 to 10 m of depth), period overlapping with sampling dates. The environmental raw data were collected from the CHONOS database 1 , managed by the Instituto de Fomento Pesquero, IFOP (Institute of Fisheries Enhancement), for both locations.…”

Section: Methodsmentioning

confidence: 99%

“…Mytilus chilensis individuals were sampled from two places located in the main seedbeds supporting the industry (Larraín et al, 2012) (Pinilla et al, 2020), were obtained for both locations between June 2017 and May 2018 (0 to 10 m of depth), period overlapping with sampling dates. The environmental raw data were collected from the CHONOS database 1 , managed by the Instituto de Fomento Pesquero, IFOP (Institute of Fisheries Enhancement), for both locations.…”

Section: Study Sites and Samplingmentioning

confidence: 99%

Adaptive Differences in Gene Expression in Farm-Impacted Seedbeds of the Native Blue Mussel Mytilus chilensis

et al. 2021

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The study of adaptive population differences is relevant for evolutionary biology, as it evidences the power of selective local forces relative to gene flow in maintaining adaptive phenotypes and their underlying genetic determinants. However, human-mediated hybridization through habitat translocations, a common and recurrent aquaculture practice where hybrids could eventually replace local genotypes, risk populations’ ability to cope with perturbations. The endemic marine mussel Mytilus chilensis supports a booming farming industry in the inner sea of Chiloé Island, southern Chile, which entirely relies on artificially collected seeds from natural beds that are translocated to ecologically different fattening centers. A matter of concern is how farm-impacted seedbeds will potentially cope with environmental shifts and anthropogenic perturbations. This study provides the first de novo transcriptome of M. chilensis; assembled from tissue samples of mantles and gills of individuals collected in ecologically different farm-impacted seedbeds, Cochamó (41°S) and Yaldad (43°S). Both locations and tissue samples differentially expressed transcripts (DETs) in candidate adaptive genes controlling multiple fitness traits, involved with metabolism, genetic and environmental information processing, and cellular processes. From 189,743 consensus contigs assembled: 1,716 (Bonferroni pvalue ≤ 0.05) were DETs detected in different tissues of samples from different locations, 210 of them (fold change ≥ | 100|) in the same tissue of samples from a different location, and 665 (fold change ≥ | 4|) regardless of the tissue in samples from a different location. Site-specific DETs in Cochamó (169) and Yaldad (150) in candidate genes controlling tolerance to temperature and salinity shifts, and biomineralization exhibit a high number of nucleotide genetic variants with regular occurrence (frequency > 99%). This novel M. chilensis transcriptome should help assessing and monitoring the impact of translocations in wild and farm-impacted mussel beds in Chiloé Island. At the same time, it would help designing effective managing practices for conservation, and translocation traceability.

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“…Wind alters water age distribution in the tidal Rappahannock River, a western tributary of the Chesapeake Bay, USA [25]. The Patagonian fjord in Chile had high water age values due to increased wind stress [29]. Wind enhances transport and vertical mixing and changes the gravitational circulation in the water area [25].…”

Section: Discussionmentioning

confidence: 99%

“…A variety of indicators have been proposed to evaluate water transport timescales [6][7][8]12,[15][16][17][18][19][20][21]. Among these indicators, water age is a helpful hydrodynamic indicator in quantifying temporally and spatially the processes of water exchange and material transport in rivers, lakes/reservoirs, estuaries, coasts, and oceans with wide water exchange triggered by different flow rates, wind, tide, and density structure or human regulations, and was successfully applied in big shallow lakes having limited water movement [7,12,[21][22][23][24][25][26][27][28][29][30]. Water age is a complement to water residence time.…”

Section: Introductionmentioning

confidence: 99%

Diagnostic Simulation of Water Age in Small Lake of Bosten Lake

Liu

Zhong

Bao

et al. 2021

Water

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Concerns have increased regarding water quality deterioration in arid land water. Water age is a useful indicator of the susceptibility of water bodies to water quality deterioration and is helpful for knowing the basic mechanisms governing the transport of materials through water bodies. In the current study, the spatial distributions of water age in the small lake of Bosten Lake (hereinafter referred to as small lake) were investigated with a two-dimensional hydrodynamic model built on the basis of the Environmental Fluid Dynamics Code (EFDC) model. In particular, the influences of different water flow periods, farmland drainages, and wind directions on water age distributions in the small lake were investigated. The modeled water age in the small lake has high spatial variability. The water age is maximum at the northeastern part and minimum at the center of the small lake. The water age in the small lake is lower during wet periods and gets larger for dry periods. After five years’ simulation, the average water age in the whole small lake system was 594, 684, and 794 days under wet, normal, and dry periods. Increasing the hydraulic connectivity of the small lake can reduce its water age by opening its ecological gate inflow and Ahongkou gate outflow. This is the more favorable hydraulic conditions promoting water exchange in most regions of the small lake and can be used in hydraulic engineering to improve its water age. The farmland drainages should be controlled around the small lake. The mean water age of the whole small lake under the northwestern wind is lower than that under the southwestern wind. The simulated results provide important information for comprehending the water exchange efficiency, help in discovery of areas of the small lake most likely to experience water quality degradation, and can be used to design the engineering projects to improve or protect the water environment.

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Water age variability in a Patagonian fjord

Cited by 20 publications

References 59 publications

Niche differentiation of Dinophysis acuta and D. acuminata in a stratified fjord

Niche differentiation of Dinophysis acuta and D. acuminata in a stratified fjord

Adaptive Differences in Gene Expression in Farm-Impacted Seedbeds of the Native Blue Mussel Mytilus chilensis

Diagnostic Simulation of Water Age in Small Lake of Bosten Lake

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