Tomasz Boski

• MSc., Dr.Sc.
• Professor (Full) at University of Algarve

The antecedent geomorphological and structural framework combined with nearshore dynamics and sediment budget provided the conditions necessary for the formation of coastal plains along the southern Brazilian littoral during the Holocene. To establish a temporal framework for littoral accretion, we applied 14C dating of humic organic material from...

This study reviews data on sea-level rise during the last 13000 yr cal. BP (13 kyr) as recorded in the estuarine sediments of the Guadiana River (SE Portugal, SW Spain). We combined new data from a 63 m-long borehole, drilled through the entire postglacial sedimentary sequence, with information on five previously studied cores. By integrating sedim...

We report the preliminary data on organic carbon accumulation rates which are being determined in the infill sequences of several estuaries, in the coastal fringe of Algarve (S Portugal). The so far analysed sedimentary sequences of Guadiana River estuary represent the time span from ca 10000 yr. cal BP to present. The obtained data indicate that u...

Fourteen trace elements (Sr, Ba, La, Ca, Mg, Cu, Zn, V, Ni, Co, Mn, Ga, Cr, Zr) were determined in 120 auger- and core-drill samples from one bauxite plateau situated in the SE part of Guinea Bissau. Following the quantitative determination of minerals identified in the samples, all geochemical and mineralogical data were statistically treated. The...

As salinas são ambientes hipersalinos artificiais de onde se extrai sal de mesa ou halite (NaCl, cloreto de sódio). A produção de sal no estuário do Rio Guadiana é baseada na evaporação da água do mar em salinas, tendo o sol como fonte de calor. Este capítulo é uma descrição da produção de sal como uma das poucas atividades económicas legalmente pe...

Aim: Temperate forests are currently facing multiple stresses due to climate change, biological invasions, habitat fragmentation and fire regime change. How these stressors interact with each other influences how, when and whether ecosystems recover, or whether they adapt or transition to a different ecological state. Because forest recovery or col...

Sea level changes provoked by multiple forcings that act in a wide range of time scales attracted human interest for several millennia. However, the bases of modern understanding of this phenomenon and its quantitative expression were achieved during the last two centuries. At present, owing to a series of altimetric observations made by 4 satellit...

Sedimentary organic matter (OM) origin and molecular composition provide useful information to understand carbon cycling in coastal wetlands. Core sediments from threors’ Contributionse transects along Ria Formosa lagoon intertidal zone were analysed using analytical pyrolysis (Py-GC/MS) to determine composition, distribution and origin of sediment...

Anthropogenic impact can alter food web structure through changes in species interactions. In this study, we explored the food web of three Mediterranean stream reaches (two seasonal and one permanent) along an anthropogenic impact gradient to test the hypothesis that increasing impact simplifies food webs. To test this, we applied the isotopic (δ1...

The southernmost coast of Portugal at the Algarve region is characterized by a remarkable diversity and beauty of landscapes, from high cliffs exposing rocks of diverse geological ages to the more recent lowlands. Rocky coastal landscapes are the result of waves, currents, tides and rainwater erosion. The Algarve southern rocky coast may be divided...

Estuaries are dynamic interfaces between land, rivers and the ocean that play major roles in the global carbon cycle. These coastal wetlands store huge amounts of organic carbon (OC), commonly known as "blue carbon" and excellent places to study C cycling. The Guadiana river estuary is among the most important tidal salt marshes in the South-Iberia...

Estuaries are dynamic interfaces between land, rivers and the ocean that play major roles in the global carbon cycle. These coastal wetlands store huge amounts of organic carbon (OC), commonly known as “blue carbon” and excellent places to study C cycling. The Guadiana river estuary is among the most important tidal salt marshes in the South - Iber...

Acid mine drainage is one of the main environmental hazards to ecosystems worldwide and it is directly related to mining activities. In Ecuador, such acidic-metallic waters are drained to rivers without treatment. In this research, we tested a laboratory combined (Ca-Mg) Dispersed Alkaline Substrate (DAS) system as an alternative to remediate acid...

Sainz-López, N.; Boski, T., and Sampath, D.M.R., 2019. Fleur de sel composition and production: Analysis and numerical simulation in an artisanal saltern. Journal of Coastal Research, 35(6), 1200–1214. Coconut Creek (Florida), ISSN 0749-0208. This study is a first approach to modelling of fleur de sel production, aimed at increasing its efficiency...

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Mangrove vegetation covers extensive areas along Brazilian tropical coasts and accumulates large amounts of organic carbon in the intertidal sediments. We have investigated the molecular biomarker composition of mangrove sediments from the Potengi estuary North-East Brazil. To characterise sources and fate of sedimentary organic matter (OM), a dire...

In the present study, we adopted the Hybrid Estuarine Sedimentation Model to simulate the estuarine and lagoon evolution in the South Algarve region due to projected mean sea level rise (MSLR) and sediment deficit scenarios during the 21st century. Thus, we forecasted morphological evolution of six large and medium size estuaries (Guadiana Alcantar...

Karst landscapes display remarkable morphological diversity and raise challenging management questions. Understanding karst processes is particularly relevant to the management of densely populated rocky coastlines, since sea-level rise influences the erosion rate of potentially hazardous landforms (e.g. sinkholes). Appropriate management strategie...

Holocene evolution of the Ria Formosa barrier island system was studied through the examination of a large subsurface dataset acquired from 191 boreholes and five seismic refraction profiles. Two boreholes with total depths of 26 and 16.5 m were selected for a multi-proxy detailed laboratory analysis, including mean grain size distribution, organic...

The concentration of meteoric 10Be in estuarine sediment samples has been measured by Spanish Accelerator for Radionuclides Analysis (SARA) at CNA and subsequently used to assess the denudation rate in Guadiana river basin together with the sediment budget method, on both sides of the frontier between Spain and Portugal. The two methods yielded coi...

A detailed geomorphological survey using Light Detection and Ranging (LiDAR) was carried out along the western part of the Assu River valley, NE, Brazil. The study was complemented by the investigation of sedimentological, mineralogical, and sediment benthic foraminifera indicators within the 14C geochronological framework. The integration of data...

Formation of notches is an important process in the erosion of seaside cliffs. Monitoring of coastal notch erosion rate and processes has become a prime research focus for many coastal geomorphologists. Observation of notch erosion rate considers a number of characteristics, including cliff collapse risk, distinction of historical sea levels, and r...

Formation of notches is an important process in the erosion of seaside cliffs. Monitoring of coastal notch erosion rate and processes has become a prime research focus for many coastal geomorphologists. Observation of notch erosion rate considers a number of characteristics, including cliff collapse risk, distinction of historical sea levels, and r...

We describe production of Fleur de sel in the solar saltponds of Castro Marim (Portugal) where the local producers reoriented and substantially increased output of this variety of salt. Indeed this culinary specialty is commercialized for a price order of magnitude higher than coarse marine salt which traditionally dominated the production. Because...

This study describes the geomorphological patterns in the estuary of the Assu river, state of Rio Grande do Norte, northeastern of Brazil. The 20 m contours of the topographic maps (Macau and Porto do Mangue), at the 1:50,000 scale, were manually digitized and analyzed using SPRING 5.2. Afterwards, the techniques used in this study consisted of the...

Early-to late Holocene sedimentary infill of the Potengi-Jundiai Estuary (Brazil) was studied in a 31.5 m long sediment core. The borehole was drilled in a mangrove area within the central part of the flood tide delta. The sedimentary record, encompassing the last 10 kyr, was studied for sediment texture and for the n-alkanes composition of organic...

Large-scale geomorphological evolution of an estuarine system was simulated by means of a hybrid estuarine sedimentation model (HESM) applied to the Guadiana Estuary, in Southwest Iberia. The model simulates the decadal-scale morphodynamics of the system under environmental forcing, using a set of analytical solutions to simplified equations of tid...

Long-term coastal evolution of the Ludo sub-basin of the Ria Formosa Lagoon was simulated using a hybrid modelling approach. The spatial and temporal response of the basin to eustatic sea-level rise (SLR) varies significantly. The inner basin accretes due to sea-level rise (SLR) while the initial response of intertidal zone to SLR is the erosion of...

Development of saltmarshes and their long-term survival depends on the sea level rise rate and the sedimentation rate in the new accommodation space. The most widely used strategy to mitigate the negative consequences of river flow regulations is based on defining ecological flows (EF), which are the minimum water requirements left in a river syste...

In the context of rapid sea-level rise during the 21st century, the reduction of fluvial sediment supply due to the regulation of river dis- charge by dams represents a major challenge for managing estuarine habitats. For instance, the discharge of the Guadiana River is regulated by more than 100 dams over the last 50 years. The Alqueva dam across...

SEA-LEVEL RISE EPISODES DURING THE HOLOCENE IN THE POTENGI–JUNDIAI ESTUARY, NE BRAZIL INFERRED FROM DIRECT ANALYTICAL PYROLYSIS (Py- GC/MS) OF SEDIMENTS

Diatoms are unicellular algae that live in saline, brackish and freshwater environments, either floating in the water column or associated with various substrates (e.g., muddy and sandy sediments). Diatoms are sensitive to changes in environmental variables such as salinity, sediment texture, nutrient availability, light and temperature. This chara...

In this paper, we reconstruct the Holocene paleoenvironmental evolution of the Guadiana Estuary, southwestern Iberian Peninsula. Two previously studied boreholes (CM3 and CM5) were revisited and analyzed in the light of a foraminifera modern analog approach. Cluster analyses define four assemblages with different biocenotic, taphonomic, elevation a...

In the context of rapid sea-level rise in the 21st century, the reduction of fluvial sediment supply due to the regulation of river discharge represents a major challenge for the management of estuarine ecosystems. Therefore, the present study aims to assess the cumulative impacts of the reduction of river discharge and projected sea-level rise on...

This paper presents an analysis of the vulnerability (AVI Index) and hazard of flooding by sea level rise (FRI Index) in the central Algarve (South Portugal), between the cities of Portimão and Tavira, which is an area of intense urban impact and fast growing tourism. The vulnerability index has beenwas calculated from using the following parametri...

The Guadiana River is the fourth longest river in Europe and is a natural frontier between southern Portugal and Spain. This river was historically used to transport minerals exploited in the region since the Roman Empire and therefore suffered human interventions that have been intensified after the industrial revolution. The Guadiana River has in...

As diatomáceas são algas microscópicas que vivem na coluna de água e associadas aos sedimentos dos rios, bem como dos lagos e oceanos. Por serem capazes de viver numa diversidade tão grande de ambientes elas são excelentes indicadores ambientais. Contudo, as diatomáceas têm sido pouco estudadas nos ambientes estuarinos. Sendo o Rio Arade o segundo...

The detrended correspondence analysis (DCA) applied to the relative abundance of ostracoda species and physicalchemical, sedimentological and geochemical parameters allowed to identified four sectors in the estuary of the Arade River: Sector I - located between the mouth of estuary and Portimão City and is characterized by the largest number of spe...

The detrended correspondence analysis (DCA) applied to the relative abundance of ostracoda species and physicalchemical, sedimentological and geochemical parameters allowed to identifid four sectors in the estuary of the Arade River: Sector I - located between the mouth of estuary and Portimão City and is characterized by the largest number of spec...

The genus Simonsenia is reviewed and S. aveniformis described as new for science by light and electron microscopy. The new species originated from estuarine environments in southern Iberia (Atlantic coast) and was isolated into culture. In LM, Simonsenia resembles Nitzschia, with bridges (fibulae) beneath the raphe, which is marginal. It is only el...

This study analyses the taxonomy, ecology and biogeography of the species of benthic foraminifera living on the intertidal margins of the Guadiana Estuary (SE Portugal, SW Spain). Of the 54 taxa identified during sampling campaigns in winter and summer, 49 are systematically listed and illustrated by scanning electron microscope (SEM) photographs....

This paper focuses on simulations of the morphological evolution of an estuary during sedimentary infilling that accompanied Holocene sea-level rise. The simulations were conducted using the Estuarine Sedimentation Model, which uses a behaviour-oriented approach, supported by the chronostratigraphy of the estuary’s sedimentary sequence. Behaviour c...

The present study analyzes the spatial distribution and seasonal distribution of live benthic foraminiferal communities in the estuary of Guadiana, the fourth largest river on the Iberian Peninsula, and establishes, through statistical analysis, their relationships with a series of environmental parameters. Forty-four superficial sediment samples w...

The advancement of Integrated Coastal Zone Management (ICZM) in Latin American countries may vary from established programs to experimental phase implementation and even inexistence. This creates an opportunity for the development of new ideas and experiments, especially in the quite long stretches of littoral where no occupation has yet been plann...

A Choice Modeling (CM) study was chosen to assess specific management actions related to bird-watching on the Portuguese island of Terceira in the Azores. The usual willingness-to-pay measure was replaced by the willingness-to-stay (WTS) longer on the island for bird-watching, given changes in the site attributes. Results of the valuation study wer...

Due to the constant need of improving educational tools by means of fast evolving e-technologies, the Centre of Marine and Environmental Research (CIMA) assumed the responsibility of creating effective means of communication between the general public and research community, using interactive multimédia platforms (educational applications). Followi...

O rápido desenvolvimento das técnicas de edição integrada de textos, imagens e sons, criou um vasto campo para produção de aplicações didáticas destinadas a todos os tipos de ensino. Durante a última década, o Centro de Investigação Marinha e Ambiental (CIMA) da Universidade do Algarve assumiu a responsabilidade de criar novos meios de comunicação...

The definition of management actions in natural resource management requires the integration of all types of knowledge involved. An appropriate approach for such a challenge is the ideal of transdisciplinarity. A transdisciplinary process can be considered “consultative” when knowledge is simply gathered and collated, or “participatory” when knowle...

Na atualidade torna-se inquestionável a necessidade de integrar a aprendizagem com as novas tecnologias de modo a cativar e facilitar a compreensão dos temas abordados através de aplicações didáticas. Durante a última década o Centro de Investigação Marinha e Ambiental (CIMA) assumiu a responsabilidade de criar meios eficazes de comunicação entre o...

452_Camacho.pdf | DOI:10.5894/rgci452 Geochemical characteristics of sediments along the margins of an atlantic-mediterranean estuary (the Guadiana, Southeast Portugal): spatial and seasonal variations * Características geoquímicas das margens dum estuário Atlanto-Mediterrânico (o Guadiana, Sudeste de Portugal): variação espacial e sazonal AbstrAct...

The understanding of the sedimentological and physico-chemical characteristics of intertidal zones is important for defining baselines for studies focused on (i) the ecological distribution of estuarine benthic communities, (ii) estuarine environmental status, and (iii) improvement of paleoenvironmental reconstructions in estuarine systems through...

Em setembro de 2010 foram coletadas cinco amostras de sedimento ao longo do estuário do rio Arade objetivando a identificação de compartimentos ambientais como base na distribuição das espécies de foraminíferos e sua relação com os parâmetros físico-químicos, sedimentológicos e geoquímicos. Foram identificadas 39 espécies de foraminíferos, sendo 31...

A digital paleosurface model of Ria Formosa based on two borehole campaigns, five seismic refraction profiles and data from other researchers is presented. It reveals the existence of a complex network of fluvial paleovalleys cutting through the underlying pre-Holocene topography. Two major sedimentary units could be distinguished. Borehole sedimen...

Diatom assemblages were studied along an intertidal transect in the lower Guadiana River Estuary (South-Eastern Portugal). The analyses of the assemblages by means of light and scanning electron microscope revealed a new diatom genus and species, Syvertsenia iberica. Syvertsenia was found in three out of eighteen of the samples analysed in the tran...

Due to the constant need to improve educational tools by means of fast evolving e-technologies, the Centre of Marine and Environmental Research (CIMA) assumed the responsibility of creating efective means of communication between the general public and research community, through interactive multimedia platforms (educational applications). Followin...

A paleotopographic model of Ria Formosa is presented based on two borehole campaigns and a systematic comparison with previous works, revealing the existence of a complex network of fluvial valleys. Vertical sediment profiles showed a mosaic of changing depositional environments, resulting from local hydrodynamics, sedimentary sources and, to an ex...

The multiproxy information data set obtained from borehole sequences permitted to establish a robust chronology of events, which led to the post glacial infilling of the terminal stretches of regional river palleovaleys. The paleoecological reconstructions combined with 14C age model of Guadiana Estuary sedimentary record revealed the fast sea leve...

The fossil foraminifera assemblages of the Ria Formosa Lagoon has been studied in two sediment cores collected in the system. Four distinct assemblages were identified along the analyzed cores, each one of them characteristic of a different Foraminiferal Indicator of Marine Influence (FIMI). The variation of FIMI indicates the presence marine envir...

1. Introduction This paper focuses on assessment of impacts on intertidal zone habitats of the lower Guadiana estuary due to the foreseen sea-level rise during the 21 st century. Impacts were estimated by analysing simulated results of the morphological evolution due to sea-level rise during this century. Simulation of morphological evolution was c...

In order to enhance our understanding of the evolution of the Guadiana Estuary since the Last Glacial Maximum, a diatom-based study was performed on a core collected in a salt-marsh zone of the Guadiana River. The core spans more than 13241 cal. years B.P. Between ca. 62-m and 25.5-m depth the diatom assemblages are indicative of a prevailing salt-...

Most sedimentological studies focussed so far on concretions in centimeter-scale. Authors described micrometer-scale concretions found within the Holocene sediments in the estuary of Guadiana River at a depth of about 41 m in the transitional, fluvial-estuarine facies. The concretions show internal zoning in micro-scale, pointing to their complex o...

The authors described micro-scale carbonate concretions occurring at a depth of about 41 m within Holocene sandy sediments filling the Guadiana River paleovalley, representing the transitional fluvial-estuarine facies. Despite their minute sizes, the micro-concretions show a complex internal structure. Regular distribution of Mg, Mn and Ca can be a...

Report on the outcomes of Project SWIRL, financed by the Portuguese Science Foundation (FCT, project ID: PTDC/AAC-CLI/108518/2008). The project aimed to: • Produce new data on the history of SW Iberia’s plant cover and biodiversity; • Provide information on the long-term role of fire in Portuguese landscapes; • Study the relationship between pollen...