Joanna Pawłowska

Institute of Oceanology Polish Academy of Sciences

This paper presents the reconstruction of climate-driven environmental changes of the last millennium from Hornsund Fjord (Svalbard) based on sedimentological and micropalaeontological records. Our palaeo-investigation was supported by the analysis of foraminiferal ancient DNA (aDNA), focusing on non-fossilised monothalamous species. The main clima...

Previous sedimentary and model-based investigations of the Storegga tsunami were primarily limited to the regions proximal to its origin. However, the catastrophic event may have had impacts extending to distances much greater than previously recognized, which remain elusive. Here, we investigated the Storegga slide-induced tsunami currents propaga...

Environmental DNA (eDNA) preserved in marine sediments is increasingly being used to study past ecosystems. However, little is known about how accurately marine biodiversity is recorded in sediment eDNA archives, especially planktonic taxa. Here, we address this question by comparing eukaryotic diversity in 273 eDNA samples from three water depths...

Simple Summary Recently observed rapid climate change in the Arctic region affects the ecology of all organisms; however, little attention has been paid to the impact on microbial communities and large-scale microbial processes in the Arctic. Therefore, we analyzed the microbiome collected from the Greenland and Spitsbergen shelves, on the opposite...

Sedimentary ancient DNA (sedaDNA) offers a novel retrospective approach to reconstructing the history of marine ecosystems over geological timescales. Until now, the biological proxies used to reconstruct paleoceanographic and paleoecological conditions were limited to organisms whose remains are preserved in the fossil record. The development of a...

Arctic marine biodiversity is undergoing rapid changes due to global warming and modifications of oceanic water masses circulation. These changes have been demonstrated in the case of mega- and macrofauna, but much less is known about their impact on the biodiversity of smaller size organisms, such as foraminifera that represent a main component of...

Arctic marine biodiversity is undergoing rapid changes due to global warming and modifications of oceanic water masses circulation. These changes have been demonstrated in the case of mega- and macrofauna, but much less is known about their impact on the biodiversity of smaller size organisms, such as foraminifera that represents a main component o...

Norwegian fjords have been recently recognized as hot spots for carbon burial due to the large amounts of terrestrial organic matter delivered to fjord sediments, as well as the high sediment accumulation rates. Here, we present the first data on the contribution of benthic foraminiferal inorganic carbon to the sediments of three Norwegian fjords....

Since the seminal paper in 1998 (Coolen and Overmann), sedimentary ancient DNA (sedaDNA) has become a powerful tool in paleoecology to reconstruct past changes in terrestrial and aquatic biodiversity. Still, sedaDNA is an emerging tool and there is a need for calibrations and validations to ensure the reliability of sedaDNA as a proxy to reconstruc...

Ecosystems of arctic fjords are exposed to various natural and human-induced stressors that shape the taxonomic structure and functioning. Glacial activity and meltwater inflows together with advection of sea water masses from shelves form variety of environmental gradients that have been shown to influence marine biota. Some of these stressors lik...

Neuston samples were collected with a Manta trawl in the rim of the Arctic Ocean, in the Northern Atlantic Ocean and the Baltic Sea at eleven coastal and open-sea locations. All samples contained plastics identified by FTIR microscopy. Altogether, 110 microplastics pieces were classified according to size, shape, and polymer type. The concentration...

The Younger Dryas (YD) is recognized as a cool period that began and ended abruptly during a time of general warming at the end of the last glacial. New multi-proxy data from a sediment gravity core from Storfjordrenna (western Barents Sea, 253 m water depth) reveals that the onset of the YD occurred as a single short-lived dramatic environment det...

Deciphering the evolution of marine plankton is typically based on the study of microfossil groups. Cryptic speciation is common in these groups, and large intragenomic variations occur in ribosomal RNA genes of many morphospecies. In this study, we correlated the distribution of ribosomal amplicon sequence variants (ASVs) with paleoceanographic ch...

Although the environmental factors influencing the growth rate and reproduction of benthic foraminifera are known, the relationship between foraminifera test size and environmental variables remains unclear, especially on geological timescales. In this article, we present two records of benthic foraminiferal test size over the last 14 000 years fro...

Environmental DNA (eDNA) is usually defined as genetic material obtained directly from environmental samples, such as soil, water, or ice. Coupled to DNA metabarcoding, eDNA is a powerful tool in biodiversity assessments. Results from eDNA approach provided valuable insights to the studies of past and contemporary biodiversity in terrestrial and aq...

The main goal of this study is to reconstruct the paleoceanographic development of Storfjorden during the Neoglacial (∼4 cal ka BP). Storfjorden is one of the most important brine factories in the European Arctic and is responsible for deepwater production. Moreover, it is a climate-sensitive area influenced by two contrasting water masses: warm an...

The increasing influence of Atlantic Water (AW) in the Barents Sea, a process known as “Atlantification”, is gradually decreasing sea ice cover in the region. Ongoing global climate warming is likely to be one of its drivers, but to further understand the role of natural variability and the biogeochemical impacts of the inflow of AW into the wester...

This correction stands to correct the original article as it was published with omitted funding information. To correct this, the authors have raised this correction and would like readers to know the following: “J.P. was supported by the National Science Centre Grant No. 2015/19/D/ST10/00244.” The original article has been corrected.

The structure of benthic population depends highly on the process of recruitment which occurs after successful settlement of larva on suitable substrata. In the Arctic, there are still gaps in knowledge regarding functioning of shallow water biota especially during polar night. The main aim of the study was to investigate seasonal variability of re...

The structure of benthic population depends highly on the process of recruitment which occurs after successful settlement of larva on suitable substrata. In the Arctic, there are still gaps in knowledge regarding functioning of shallow water biota especially during polar night. The main aim of the study was to investigate seasonal variability of re...

Foraminifera are numerically abundant components of the benthic fauna; thus, they are very important compounds in glaciomarine environments. However, ongoing oceanographic changes may infuence their distribution, abundances and diversity diferently at diferent times of the year. In the present study, we aimed to assess seasonal environmental change...

The main goal of this study was to reconstruct the paleoceanographic development of Storfjorden during the Neoglacial (~ 4 cal ka BP). A multiproxy approach was applied to provide evidence for interactions between the inflow of Atlantic Water (AW) and sea-ice coverage, which are the major drivers of environmental changes in Storfjorden. The sedimen...

It is well known that thiols, dithiols and other thiolated species adsorb easily on gold surfaces but they do not adsorb on carbon electrodes. Interestingly, when the same ferrocene thiol is bound to a gold nanoparticle, the adsorption at carbon surfaces becomes very strong. Electrochemical behaviour of ferrocenylated nanoparticles adsorbed on carb...

The influence of the Coriolis force on the Hornsund fjord environment (southern Spitsbergen) was investigated in the marine sedimentary record from the last century. Due to the influence of the rotational effects, Atlantic and Arctic Water enter the fjord along the southern shore and exit along the northern shore. Thus, the sedimentary record from...

We present the structures of new rotaxanes. They are composed of dibenzo-24-crown-8 and an axle containing two tetraazamacrocyclic units coordinating the same, or different, metal ions (Ni or/and Cu). These units are linked with the m- and p-xylylene bridges. The structures of these compounds were confirmed by single crystal X-ray diffraction, NMR,...

A new dataset of benthic foraminiferal assemblages from Adventfjorden (tributary fjord of Isfjorden, West Spitsbergen) was compared with the results of a study conducted by Zajączkowski et al. (2010) in Hornsund (West Spitsbergen). According to Nilsen et al. (2016), Atlantic water inflow to the Isfjorden Trough occurs more readily than to anywhere...

The aim of this study was to determine the amount of organic and inorganic carbon in foraminifera specimens and to provide quantitative data on the contribution of foraminifera to the sedimentary carbon pool in Adventfjorden. The investigation was based on three calcareous species that occur commonly in Svalbard fjords: Cassidulina reniforme, Elphi...

C60TEMPO10 catalytic system linked to a microspherical gold support through a covalent S-Au bond was developed. The C60TEMPO10@Au composite catalyst had a particle size of 0.5–0.8 μm and was covered with the fullerenes derivative of 2.3 nm diameter bearing ten nitroxyl groups; the organic film showed up to 50 nm thickness. The catalytic composite a...

To improve the direct electron transfer from a multicopper oxidase MvBOd to the glassy carbon electrode surface the naphthylated multiwall carbon nanotubes (Napht-MWCNTs) are combined with gold nanoparticles (AuNPs) to form a conductive network at the electrode and to increase its working surface. Such approach allowed to eliminate the necessity of...

Palaeotsunami deposits are the primary sources of information on past large tsunami events and thereby are critical for earthquake and tsunami hazard assessments. They usually form sandy layers preserved in coastal sediments and contain indicators of marine origins, such as microfossils (e.g., diatoms and foraminifera) and geochemical signals of sa...

This paper presents a reconstruction of climate-driven environmental changes over the last millennium in Hornsund Fjord (Svalbard), based on sedimentological and micropalaeontological records. Our palaeo-investigation was supported by an analysis of foraminiferal ancient DNA (aDNA), focusing on the non-fossilized monothalamous species. The main cli...

A tailored di-S-acetyl anthracene derivative was synthesized and anchored to a gold electrode in order to produce well-ordered monolayers of C60 fullerene according to the Diels-Alder reaction. AFM studies, IRRAS and XPS spectroscopy proved successful grafting onto the Au surface of both anthracene dithioacetate and its subsequent Diels-Alder adduc...

The sedimentary environment, sediment characteristics and age-depth models of sediment sequences from Arctic lakes Revvatnet and Svartvatnet, located near the Polish Polar Station in Hornsund, southern Svalbard (77 degrees N), were studied with a view to establishing a basis for paleolimnological climate and environmental reconstructions. The resul...

The sedimentary environment, sediment characteristics and age-depth models of sediment sequences from Arctic lakes Revvatnet and Svartvatnet, located near the Polish Polar Station in Hornsund, southern Svalbard (77°N), were studied with a view to establishing a basis for paleolimnological climate and environmental reconstructions. The results indic...

Arctic coastal zones serve as a sensitive filter for terrigenous matter input onto the shelves via river discharge and coastal erosion. This material is further distributed across the Arctic by ocean currents and sea ice. The coastal regions are particularly vulnerable to changes related to recent climate change. We compiled a pan-arctic review tha...

A series of new fulleropyrrolidine alkylaromatic sulphides with different substituents on the sulphur atom were synthesized. The redox properties of the C60 derivatives in solution and self-assembled on gold electrode surfaces were characterized by cyclic and differential pulse voltammetry. All fullerene derivatives were found to be bound to the go...

Clim. Past Discuss., 11, 3665–3698, 2015 www.clim-past-discuss.net/11/3665/2015/ doi:10.5194/cpd-11-3665-2015

In marine environments Ostracoda and Foraminifera have been very successful invaders. During the Phanerozoic they colonised the majority of shallow, marginal to deep water, fully marine habitats. Both groups had developed physiological adaptations which pre-adapted them to the invasion of new marine habitats. They adopted a broad range of feeding s...

In recent years, numerous new proxies have been developed for the reconstruction of past environmental conditions in the polar regions. In this review we focus on the selected methods that are used in the reconstruction of the Arctic marine paleoenvironments, i.e., organic (IP25 and PIP25 index, UK37 and UK'37 and GDGT palaeothermometry) and inorga...

A new procedure for the synthesis of S-acetyl-derivatized fullerene is described. The deprotected aromatic S-acetyl-derivatized fullerene was employed for efficient modification of a gold electrode and gold nanoparticles. The proposed deposition procedure of fullerene derivative on Au surfaces allows the control of the thickness of the self-assembl...

This communication reports novel sandwich-like rotaxane shuttle, which exhibits unique mode of potential-controlled behaviour. Two dynamic processes occur simultaneously – conformational "unfolding" of the DADA stack accompanies translocation of the ring over the rotaxane's axle.

Recent palaeogenetic studies have demonstrated the occurrence of preserved ancient DNA (aDNA) in various types of fossilised material. Environmental aDNA sequences assigned to modern species have been recovered from marine sediments dating to the Pleistocene. However, the match between the aDNA and the fossil record still needs to be evaluated for...

A novel, mechanically interlocked molecular device was obtained from unique supramolecular tectons - π-deficient tetraazamacrocyclic complexes of copper(II) and nickel(II). We present the synthesis of the first rotaxanes based on donor-acceptor interactions involving transition metal complexes. While spontaneous shuttling manifests itself in the va...

A series of thioacetyl-functionalized fullerene-C60 derivatives were synthesized using the Prato reaction of fullerene-C60 with six different 4-(S-acetylthioalkyl)benzaldehydes. The structures of the synthesized compounds were characterized by FT-IR, 1H NMR and ESI-MS techniques. The LUMO–HOMO band gaps, derived from DFT B3LYP/6-31G* calculations,...

C60 molecules have been functionalized according to the Prato method with the short S-acetyl-protected chains. The redox properties of this fullerene derivative in the solution reveal reversible 1e reduction - oxidation steps similar to those of C60 but shifted to more negative potentials. The in situ deprotected fullerenethioacetate compound forms...

Strong environmental seasonality is a basic feature of the Arctic system, still there are few published records of the seasonal variability of the Arctic marine biota. This study examined the year-round seasonal changes of soft bottom macro- and meiobenthic standing stocks and diversity on a station located in an Arctic fjord (Adventfjorden, Spitsb...