Low-frequency physical variations in the coastal zone of Ubatuba, northern coast of São Paulo State, Brazil

Valentim, Samuel Soares; Bernardes, Marcos Eduardo Cordeiro; Dottori, Marcelo; Cortezi, Matheus Vasconcellos

doi:10.1590/s1679-87592013000300003

Cited by 11 publications

(5 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Populations of C. bisinuatus along the São Paulo coastline exhibit a very clear fortnightly rhythm of larval release (Bueno et al 2010). In the study area, average sea surface temperature exhibits the lowest values in July, 21.9°C, and the highest in February, 28.6°C (Valentim et al 2013). The São Sebastião Channel is a meso‐oligotrophic system year‐round (Leal et al 2018).…”

Section: Methodsmentioning

confidence: 95%

Fatty acid composition as a function of latitude in barnacle cyprid larvae

Leal,

Thyrring,

Flores

et al. 2024

Limnology & Oceanography

View full text Add to dashboard Cite

Broadly distributed species need to perform well in a range of environmental conditions, but knowledge of how wide‐ranging marine larvae perform along latitudinal gradients remains limited. The fatty acid composition of larvae is important for their physiological responses to changing conditions. Here, we investigated the fatty acid composition of the last, non‐feeding stage of barnacle larvae (cyprids) using an integrative (larvae–environment) and comparative (latitudinal) approach. We measured fatty acids in the pelagic particulate matter and cyprids from Chthamalus bisinuatus, Chthamalus proteus, and Semibalanus balanoides from tropical to polar (Arctic) latitudes to identify potential food sources during the feeding larval stages (nauplius) that precede the cyprids and to ascertain larval capacity to integrate neutral (energetic) and polar (structural) fatty acids. We demonstrate that particulate matter in tropical waters mainly consisted of low‐quality saturated fatty acids derived from detrital pathways, while particulate matter from polar waters was rich in polyunsaturated fatty acids originating from living microalgae. Across the studied regions, neutral fatty acids were assimilated from various food sources including diatoms, dinoflagellates, detritus, and microeukaryotes. Cyprids consistently retained higher essential fatty acid levels than the relative share in the particulate matter. Particularly, the essential docosahexaenoic acid (22:6ω3), which was scarce in the particulate matter, was highly retained across all species but highest for the tropical cyprids. We argue that this latitudinal pattern in fatty acid retention is related to periods of reduced nutrient intake, increased energetic and/or synthetic requirements, and responses to physical large‐scale differences in environmental conditions.

show abstract

Section: Methodsmentioning

confidence: 95%

Fatty acid composition as a function of latitude in barnacle cyprid larvae

Leal,

Thyrring,

Flores

et al. 2024

Limnology & Oceanography

View full text Add to dashboard Cite

show abstract

“…It should be noted that there are quite a large number of papers on monitoring sea level changes near coasts in different areas of the World Ocean, for example, [Pérez Gómez et al, 2022;Valentim et al, 2013;Williams, 2013] but the observations obtained from these studies are used to analyze coastal erosion or to monitoring sea level changes associated with climate change and possible coastal flooding. In the recent paper [Koohestani et al, 2023] the authors analyzed the appearance of internal solitary waves in the Bay of Oman caused different mechanisms including variations of atmospheric pressure, wind, currents, etc.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Tidal and Subtidal Variations in Sea Level Close to the Southeastern Coast of Sakhalin Island Using Two-Year Time Series

Kovalev,

Kurkin,

Kovalev

et al. 2024

Russian Journal of Earth Sciences

View full text Add to dashboard Cite

The results of the study of tidal and subtidal variations in sea level in the area of the southeastern coast of the Sakhalin Island and a series of atmospheric pressure and wind speed from the open website “Weather Schedule” are presented. Using spectral analysis, astronomical tides were studied and diurnal M1, K1 and semi-diurnal M2, S2 tidal harmonics with high energy were detected. The maximum heights of tidal waves have been determined and the tidal regime in the studied water area is classified as mixed with a predominance of diurnal tides. It is shown that sea level rises due to the impact of winds on the sea surface are observed in the northerly direction of the winds, which is associated with storm surge in the coastal zone of Mordvinov Bay. The lowering of the sea level is observed with southerly winds and it is caused by the downsurge. The magnitude of the decrease in sea level for events that have a correlation between high wind speeds and the duration of influence to the winds of the western directions is maximal, and the wind speed has less influence on the magnitude of the decrease in level than its duration. Calculations of the level response to changes in atmospheric pressure using the Proudman equation and analysis of the results showed that these events can be attributed to the phenomenon of the “inverted barometer”. A comparison of theoretical profiles calculated from the time form of the Korteweg–de Vries equation with the registered profiles of sea level showed that they are well described by the profile of a solitary wave.

show abstract

“…In the Brazilian coast and especially in the coast of the state of Rio Grande do Sul (RS), there is a lack of long-term oceanographic data (Costa and Möller, 2011;Zavialov et al, 2002). Studies on SL at tidal and sub-tidal frequencies using field data are not found in the literature (Valentim et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Tidal and subtidal oscillations in a shallow water system in southern Brazil

2018

View full text Add to dashboard Cite

Andrade et al.: Sea level oscillations in shallow waters 245 Tidal and subtidal oscillations in a shallow water system in southern Brazil Sea level oscillations in time scales between hours and days have a great vertical amplitude regarding the low lying coastal gradient of the beaches in the Rio Grande do Sul coast. However, the mechanism of oscillations is poorly understood since the scarcity of observational data makes it impossible to determine the forces that control sea level oscillations. Therefore, hourly sea level and wind time series with a time period of 650 days were examined. It has been found that the mean tidal and subtidal amplitudes were very similar to each other and that a considerable portion of the energy from sea level oscillations was due to astronomical forces. A new perspective was introduced when high and low frequencies were compared, leading to the comprehension that astronomical tides should be considered in coastal studies in southern Brazil. The sea level time series analyzed in this study showed that the maximum amplitude of the high spring tide was 0.53m, and that the subtidal rise caused by the wind reached up to 0.66m. In general, when large tidal and subtidal amplitudes are added, it can generate extreme events of sea level rise on the coast, which constitute a direct threat to coastal communities and habitats.

show abstract

Low-frequency physical variations in the coastal zone of Ubatuba, northern coast of São Paulo State, Brazil

Cited by 11 publications

References 9 publications

Fatty acid composition as a function of latitude in barnacle cyprid larvae

Fatty acid composition as a function of latitude in barnacle cyprid larvae

Investigation of Tidal and Subtidal Variations in Sea Level Close to the Southeastern Coast of Sakhalin Island Using Two-Year Time Series

Tidal and subtidal oscillations in a shallow water system in southern Brazil

Contact Info

Product

Resources

About