1,721,244 research outputs found
Kowalewski M.(2011), Szczecińskie Jasne Błonia: Przestrzeń publiczna jako narzędzie budowania tożsamości [w:] Przegląd Zachodniopomorski, t. XXVI (LV), zeszyt 2, s. 103-118
No full text<p>Kowalewski M.(2011), Szczecińskie Jasne Błonia: Przestrzeń publiczna jako narzędzie budowania tożsamości [w:] Przegląd Zachodniopomorski, t. XXVI (LV), zeszyt 2, s. 103-118</p
Kowalewski M. (2007), Zmiany na cokołach. Uwagi o funkcjach pomników w przestrzeni miasta, "Obóz. Problemy narodów byłego obozu komunistycznego", nr 49, s. 125-137
No full text<p>Kowalewski M. (2007), Zmiany na cokołach. Uwagi o funkcjach pomników w przestrzeni miasta, "Obóz.<br>Problemy narodów byłego obozu komunistycznego", nr 49, s. 125-137</p
Sequence Stratigraphic Anatomy of Diversity Patterns: Late Quaternary Benthic Mollusks of Po Plain, Italy
No full textUpper Quaternary sequences of the Po Plain (Italy) were used to assess the informative strength and sequence-stratigraphic overprint of quantitative paleoecological patterns.
Three densely sampled cores (89 samples, 98 genera, 23,280 specimens), dominated by extant mollusk species with known environmental distributions, were analyzed with detrended
correspondence analysis (DCA). The DCA scores, calibrated using extant genera, provided outstanding estimates of bathymetry (63 m) and related environmental parameters.
Depth-related successions of mollusk associations delineated by using DCA were consistent with independent sequence-stratigraphic interpretations and yielded insights inaccessible via routine techniques (e.g., depth estimates for maximum flooding surfaces).
The DCA ordination demonstrates the severity of the sequence-stratigraphic overprint: samples are highly uniform taxonomically during late transgressive systems tracts and highly variable during the following highstand systems tracts. When analyzed across comparable systems tracts, similar species associations repeat during the last and current interglacial cycles, suggesting that Po Plain mollusk associations have remained remarkably stable over the past 125 k.y. The results are consistent with the bathymetric interpretation of the DC axis 1 postulated previously for the Paleozoic fossil record, demonstrate the sequence-stratigraphic overprint of paleoecological patterns predicted by computer modeling, and illustrate the utility of quantitative paleoecological patterns in augmenting sequence-stratigraphic interpretations
Bathymetric signatures and sequence overprint of mollusk associations from Late Quaternary sequences of the Po Plain (Italy)
No full textLate Quaternary mollusk-dominated sequences of the Po Plain (N. Italy) were used to assess the informative strength and sequence stratigraphic overprint of quantitative paleoecological patterns. Three densely sampled cores (89 samples, 98 genera, >23000 specimens), dominated by extant species with known environmental distributions, were analyzed using Detrended Correspondence Analysis (DCA). The DCA scores, calibrated with ecological data on extant genera, provided outstanding estimates of bathymetry (precision: +/-3m) and related environmental parameters. Depth-related successions of mollusk association delineated using DCA were consistent with independent sequence stratigraphic interpretations and yielded insights inaccessible via routine techniques (e.g., quantitative depth estimates for maximum flooding surfaces). The DCA ordination demonstrates the severity of the sequence stratigraphic overprint exerted on the associated fossil record. In all studied successions, samples are highly uniform taxonomically during late TSTs, and highly variable during the following HSTs. This pattern implies that turnover rates and beta diversity should be spuriously exaggerated during HSTs, relative to late TSTs. When data are re-examined across comparable systems tracts, nearly identical species associations repeat during the last and current interglacial cycles, indicating that Po Plain mollusk associations have remained remarkably stable over the last 125ky. The results support the bathymetric interpretation of DC1 postulated previously for the Paleozoic fossil record, demonstrate the strong stratigraphic overprint of paleoecological patterns predicted by computer modeling, and illustrate the utility of quantitative paleoecological patterns in augmenting sequence stratigraphic interpretations
Stratigraphic Paleoecology: Bathymetric signatures and sequence overprint of mollusk associations from the upper Quaternary sequences of the Po Plain, Italy
No full textUpper Quaternary sequences of the Po Plain (Italy) were used to assess the informative strength and sequence-stratigraphic overprint of quantitative paleoecological patterns.
Three densely sampled cores (89 samples, 98 genera, 23,280 specimens), dominated by extant mollusk species with known environmental distributions, were analyzed with detrended
correspondence analysis (DCA). The DCA scores, calibrated using extant genera, provided outstanding estimates of bathymetry (63 m) and related environmental parameters.
Depth-related successions of mollusk associations delineated by using DCA were consistent with independent sequence-stratigraphic interpretations and yielded insights inaccessible via routine techniques (e.g., depth estimates for maximum flooding surfaces).
The DCA ordination demonstrates the severity of the sequence-stratigraphic overprint: samples are highly uniform taxonomically during late transgressive systems tracts and highly variable during the following highstand systems tracts. When analyzed across comparable systems tracts, similar species associations repeat during the last and current interglacial cycles, suggesting that Po Plain mollusk associations have remained remarkably stable over the past 125 k.y. The results are consistent with the bathymetric interpretation of the DC axis 1 postulated previously for the Paleozoic fossil record, demonstrate the sequence-stratigraphic overprint of paleoecological patterns predicted by computer modeling, and illustrate the utility of quantitative paleoecological patterns in augmenting sequence-stratigraphic interpretations
Sequence stratigraphic anatomy of diversity patterns
No full textThe influence of sequence stratigraphic (sea-level driven) processes on patterns derived from the fossil record is receiving increasing attention. This study explores stratigraphic anatomy of diversity patterns across two late Quaternary 4th order sequences deposited on the Po Plain (Italy) over the last 150 k.y. (i.e., the two most recent glacial-interglacial cycles). The rich mollusk fauna, dominated by extant forms, preserved as a part of well-understood eustatic cycles, offers a testing ground for exploring how climate-driven sea level changes influence sample diversity, diversity turnover, and higher-order diversity patterns within and across systems tracts and sequences.
These two 4th-order depositional sequences were densely sampled from three cores. The data (150 species and 22776 specimens from 29 Holocene and 19 Pleistocene samples) were analyzed using single-sample and multi-sample rarefaction techniques. In all three cores and for both cycles, sample-level diversity decreased upward within sequences: the late Transgressive Systems Tract (TST) samples displayed the highest equitability and richness and the Highstand Systems Tract (HST) samples displayed the lowest diversity (the trend primarily reflects the increase in the dominance of most common species in HST samples). This pattern is likely due to a combination of ecological, environmental, and taphonomic processes.
Multi-sample rarefaction indicates that species turnover is more limited in transgressive phases of both depositional cycles. This trend may reflect increasing environmental heterogeneity of marginal habitats averaged within shallowing-upward successions and/or decreasing time averaging associated with increasing sedimentation rates during HST phases of the cycles. The sequence and multi-sequence diversity levels are lower than those observed within individual late-TST systems tracts, indicating that species turnover was minimal both within as well as across the last two glacial-interglacial cycles. The study shows that species richness and equitability patterns of the most common mollusk species track closely the sequence stratigraphic architecture of late Quaternary successions of Po Plain
The response of mollusk assemblages to sea-level changes assessed using computerintensive methods: A case study based on the last 150ky core records from Po Plain, North Italy
No full textWhereas the impact of sequence stratigraphy on various aspects of sedimentary and biotic records has been well established in previous research, there are comparatively few studies that explore changes in mollusk associations in response to climate-driven sea-level changes using rigorous quantitative data. The present research investigates sample-level diversity, diversity turnover, ecological structure, and taxonomic patterns in mollusk assemblages preserved in Pleistocene-Holocene sequences, which include continental, coastal and shallow-marine deposits. Two transgressive-regressive sequences, deposited in the Po Plain (Northern Italy) over the present and last interglacial cycle, were sampled from four cores. Facies analysis and detailed stratigraphic correlations both suggest that these cycles correspond to 4th-order depositional sequences, representing a time span of ~100ky. Continental deposits of the lowstand systems tract were scarcely fossiliferous (therefore not sampled), whereas shell enrichment was found in marine deposits of the retrogradational transgressive systems tracts and the overlying progradational highstand systems tract. To evaluate mollusk assemblages in terms of their responses to climate-driven sea-level changes, several computer-based strategies (rarefaction, multivariate ordination methods [CA, DCA], and randomization techniques) have been applied to 99 samples recovered from the four cored boreholes. Associations recovered by multivariate analysis are arranged along a bathymetric gradient. In the modern Po delta environment, associations similar to those recognized in this study lay on an ecocline ranging from 0 to 30 m depth. Temporal patterns in mollusk distribution suggest a link with environmental shifts that took place over the duration of these sequences (the species appear to track their favored environment). Diversity patterns track closely the sequence stratigraphic architecture, reflecting a combination of climate-driven environmental changes and sequence stratigraphic artifacts postulated by the Holland’s model
Kowalewski M. [2007], Zmiany na cokołach. Uwagi o funkcjach pomników w przestrzeni miasta, [w:] Miasta nowych ludzi (t.2, Obóz nr 49), Warszawa
No full text<p>artykuł ukazał się w wersji drukowanej: Kowalewski M. (2007), Zmiany na cokołach. Uwagi o funkcjach pomników w przestrzeni miasta, "Obóz. Problemy narodów byłego obozu komunistycznego", nr 49, s. 125-137</p
Agglutinated vs. calcareous foraminiferal assemblages as bathymetric proxies: Direct multivariate tests from modern environments
No full textBenthic foraminiferal assemblages, used widely as paleoenvironmental indicators, can potentially provide numerical estimates of relative water depth. The quality of this bathymetric proxy was tested here directly using onshore-offshore transects across two present-day marine basins: (1) Saros Bay (northern Aegean Sea), with sampling sites ranging from 15 to 500 m water depth; and (2) Marmara Sea (between Black Sea and Aegean Sea), with sampling sites ranging from 15 to 350 m water depth. For both marine basins, multivariate ordinations of calcareous and agglutinated foraminifera demonstrated that samples varied predictably in faunal composition along regional depth gradients. The multivariate ordination scores and water depth were highly and positively correlated in all cases: r(2) = 0.74 (Saros Bay, agglutinated foraminifera), r(2) = 0.67 (Saros Bay, calcareous foraminifera), r(2) = 0.68 (Marmara Sea, agglutinated foraminifera), and r(2) = 0.96 (Marmara Sea, calcareous foraminifera). Comparably robust relationships between ordination scores and water depth were observed when data were pooled across basins and/or foraminiferal type. These results suggest that both agglutinated and calcareous benthic foraminifera provide robust quantitative proxies of water depth. Multivariate ordinations based on agglutinated foraminifera may potentially yield numerical estimates of water depth in the geological record and provide a quantitative environmental framework for paleontological and stratigraphic interpretations
Kowalewski M. (2011), Mit miasta portowego jako atrakcja turystyczna [w:] Polskie Ziemie Zachodnie. Studia socjologiczne, red. A. Michalak, A. Sakson, Ż. Stasieniuk, Ziemie Zachodnie, Studia i Materiały nr 26, Instytut Zachodni, Poznań, s. 225-239
No full text<p>Kowalewski M. (2011), Mit miasta portowego jako atrakcja turystyczna [w:] A. Michalak, A. Sakson, Ż. Stasieniuk (eds.), Polskie Ziemie Zachodnie. Studia socjologiczneZiemie Zachodnie, Studia i Materiały nr 26, Instytut Zachodni, Poznań, s. 225-239.</p
- …
