&lt;strong&gt;Checklist of diatoms (Bacillariophyta) from Lake Ohrid and Lake Prespa (Macedonia), and their watersheds&lt;/strong&gt;

Levkov, Zlatko; Williams, David M.

doi:10.11646/phytotaxa.45.1.1

Cited by 32 publications

(30 citation statements)

References 27 publications

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“…The latter process might explain the prevalence of benthic species at 243 m water depth. Almost all of the identified benthic taxa have been reported from contemporary communities in the littoral zones (0-60 m water depth) of Lake Ohrid (Levkov et al, 2007;Levkov and Williams, 2012;Jovanovska et al, 2013;Pavlov et al, 2013). The benthic species slightly increased in abundance with the onset of the H4, indicating the possibility of intensified wind transport and mixing of the water column during the H4 stadial (40.4-38.4 ka).…”

Section: Diatom Responses To Disturbances In Lake Ohridmentioning

confidence: 97%

Differential resilience of ancient sister lakes Ohrid and Prespa to environmental disturbances during the Late Pleistocene

et al. 2016

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Abstract. Ancient lakes, such as lakes Ohrid and Prespa on the Balkan Peninsula, have become model systems for studying the link between geological and biotic evolution. Recently, the scientific deep-drilling project Scientific Collaboration on Past Speciation Conditions in Lake Ohrid (SCOP-SCO) was initiated to better understand the environmental, climatic, and limnological evolution of the lake. It revealed that Lake Ohrid experienced a number of environmental disturbances during its ca. 2.0 million year long history. These are comprised of disturbances that lasted over longer periods of time ("press events") such as glacial-interglacial cycles and Heinrich events, as well as sudden and short disturbances ("pulse events") like the deposition of landslides, earthquakes, and volcanic ash depositions. The latter includes one of the most severe volcanic episodes during the Late Pleistocene: the eruption of the Campanian Ignimbrite (known as Y-5 marine tephra layer) from the Campi Flegrei caldera, dated to 39.6 ± 0.1 thousand years ago. The event is recorded by the deposition of a ca. 15 cm thick tephra layer in sediment cores of lakes Ohrid (DEEP-5045-1) and Prespa (Co1204). Coincidently, this pulse event is superimposed by the Heinrich H4 event, 40.4-38.4 thousand years ago.In the current paper, diatoms were used as proxies to compare the responses of these lakes to the Y-5 (pulse) and the H4 (press) disturbances. Based on stratigraphically constrained incremental sum of squares cluster (CONISS) and unconstrained Partitioning Around Medoids (PAM) analyses, we found little evidence that diatom community compositions in either lake responded to the H4 event. However, the Y-5 influx caused clear and rapid diatom community changes. After the initial response, community compositions in Lake Ohrid and, to a lesser extent, in Lake Prespa slowly returned to their quasi pre-disturbance state. Moreover, there is no evidence for disturbance-related extinction events. The combined evidence from these findings suggests that lakes Ohrid and Prespa likely did not experience regime shifts. It is therefore concluded that both lakes show resilience to environmental disturbance. However, it seems that Lake Ohrid is more resilient than Lake Prespa, as the recovery of diatom communities is more pronounced and its estimated recovery time is only ca. 1100 years vs. ca. 4000 years in Lake Prespa. The reasons for the differential responses remain largely unknown, but differences in geology, lake age, limnology, and intrinsic parameters of the diatom proxies may play an important role.

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Section: Diatom Responses To Disturbances In Lake Ohridmentioning

confidence: 97%

Differential resilience of ancient sister lakes Ohrid and Prespa to environmental disturbances during the Late Pleistocene

et al. 2016

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“…Concerning the endemic diatom taxa, earlier studies (Levkov et al, 2007a;Levkov & Williams, 2012) noticed several spatial levels of their distribution in the whole watershed area, including Lake Prespa where taxa are (i) restricted to only one of the lakes, (ii) common to both lakes and iii) restricted to the spring area and/or Lake Ohrid. Our results show that some endemic taxa, like Amphora ohridana Levkov, Caloneis acuta Levkov, Sellaphora krsticii Levkov, Nakov & Metzeltin appeared to have limited distribution in the littoral zone, while others, such as Caloneis biconstrictoides Levkov, Cymbopleura juriljii Levkov & Metzeltin and Sellaphora macedonica Levkov & Metzeltin were restricted to the sublittoral zone of the lake.…”

Section: Diatom Diversity and Community Patternsmentioning

confidence: 99%

“…In the next step, widespread taxa were removed from the analyses and Bray-Curtis similarity was calculated with endemic taxa percentages only, to assess potential subdivisions among the endemic diversity over the sampled area. Criteria and species classification into widespread and endemic followed Levkov & Williams (2012).…”

Section: Statistical Analysesmentioning

confidence: 99%

“…Diatom species richness in Lake Ohrid was estimated to 789 taxa, 117 of which were considered endemic for the lake (Levkov & Williams, 2012). These numbers have certainly increased due to the revisions of several diatom genera and new species descriptions, resulting from the intensive taxonomic and palaeoecological research on the lake over the past few years.…”

Section: Diatom Diversity and Community Patternsmentioning

confidence: 99%

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Spatial patterns of diatom diversity and community structure in ancient Lake Ohrid

et al. 2018

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The extraordinary diversity in long-lived lakes is largely driven by distinct eco-evolutionary processes. With their unique biota and numerous endemic taxa, these lakes are key settings for fundamental studies related to ecology, diversity, and evolution. Here, we test how the environment shapes diatom diversity and community patterns over space in ancient Lake Ohrid. By applying Bray-Curtis similarity analyses of diatom community data, including widespread and endemic taxa, we identified two major zones: littoral and sublittoral. The latter one is being characterized with higher endemic diversity. The a and b diatom diversity and community distribution in the northern and eastern part of the lake are influenced by the presence of vertical (bathymetrical) and horizontal barriers. The zonation of the diatom communities appears driven by two large-scale factors: (i) water depth, and (ii) water chemistry, primarily, the concentration of total phosphorus, nitrogen ammonia, and conductivity. Both drivers appear to equally influence diatom diversity and community patterns. We present initial data on diatom-environment relations, where the results support earlier ecological studies emphasizing the relevance of ongoing human-induced eutrophication in the northern lake area. This study provides background information on the role of the environment in structuring contemporary diatom diversity. However, future research needs to focus on the biotic component including species competition in order to reveal the mechanisms driving spatial community dynamics in Lake Ohrid.

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“…Europe: Germany (Hasle 1977, Kiss et al 1990, Ludwig and Schnittler 1996, Täuscher 2014, Hungary (Kiss et al 1990, Kiss et al 2012, France (Kiss et al 1990), Britain (Belcher and Swale 1979, Hartley et al 1986, Hartley et al 1996, Whitton et al 2003, Russia (Kiss et al 1990, Genkal 1992 (Europe) (Aysel 2005), Czech Republic (Kiss et al 1990, Kaštovský et al 2010, Netherlands (Dijkman and Kromkamp 2007), Albania (Kupe et al 2010), Macedonia (Levkov and Williams 2012), Spain (Pérez et al 2009), Romania (Caraus 2002, Caraus 2012). (Fig.…”

Section: Distributionmentioning

confidence: 99%

Distribution of invasive species Actinocyclus normanii (Hemidiscaceae, Bacillariophyta) in Serbia

Vidaković¹,

Krizmanić²,

Simić³

et al. 2016

Studia bot. hung.

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Abstract:In Serbia Actinocyclus normanii was registered in several rivers and canals. In 1997, it was found as planktonic species in the Tisza River and in benthic samples (in mud) in the Veliki Bački Canal. In 2002, it was found as planktonic species in the Danube-Tisza-Danube Canal (Kajtasovo) and the Ponjavica River (Brestovac and Omoljica). Four years later, in 2006, the species was found in plankton, benthos and epiphytic samples in the Ponjavica River (Omoljica). A. normanii is a cosmopolite, alkalibiontic and halophytic species. It occurs in waters with moderate to high conductivity and it is indicator of eutrophied, polluted waters. Its spread could be explained by eutrophication of surface waters.

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<strong>Checklist of diatoms (Bacillariophyta) from Lake Ohrid and Lake Prespa (Macedonia), and their watersheds</strong>

Cited by 32 publications

References 27 publications

Differential resilience of ancient sister lakes Ohrid and Prespa to environmental disturbances during the Late Pleistocene

Differential resilience of ancient sister lakes Ohrid and Prespa to environmental disturbances during the Late Pleistocene

Spatial patterns of diatom diversity and community structure in ancient Lake Ohrid

Distribution of invasive species Actinocyclus normanii (Hemidiscaceae, Bacillariophyta) in Serbia

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