Wiebe Kooistra | Stazione Zoologica Anton Dohrn Napoli (original) (raw)

Papers by Wiebe Kooistra

Progress in molecular and subcellular biology, 2003

Diatoms are among the most diverse groups of eukaryotic microorganisms and there are probably wel... more Diatoms are among the most diverse groups of eukaryotic microorganisms and there are probably well in excess of 100,000 species (Mann and Droop 1996).The beauty and unbelievable variation of their intricately shaped and ornamented silica cell wall, called the frustule, have attracted taxonomists and naturalists alike (Round et al. 1990). More recently, ultrastructure, sexual reproduction, and the development of their unique type of zygote, called the auxospore, have also become the focus of research.

European Journal of Phycology, Feb 8, 2022

Marine planktonic diatom species can exhibit contrasting distribution patterns, from endemic to c... more Marine planktonic diatom species can exhibit contrasting distribution patterns, from endemic to cosmopolitan. Endemicity is counter-intuitive for planktonic species given their potentially large population sizes and ample migration opportunities by means of ocean currents. Here, we analyse the biogeography of six species of the diatom genus Bacteriastrum with apparently contrasting distribution patterns. Occurrence data obtained from metabarcode reads in samples from Ocean Sampling Day (OSD) sites and from Tara Oceans stations as well as from their observational records included in biodiversity data repositories of GBIF and OBIS were plotted in occurrence maps. According to metabarcoding data, the six species examined here occur all over the temperate and tropical parts of the oceans. Observational records corroborate this finding for B. elegans, B. furcatum, B. hyalinum and B. mediterraneum. Instead, atypical colony former B. jadranum is encountered at just a few distant sites, and solitary B. parallelum only in the Gulf of Naples. The metabarcoding data reveal that the latter two species are far more widely distributed than their actual sightings according to GBIF and OBIS, and that B. hyalinum also occurs in the Arctic. The most likely reasons for the discrepancies among the different data sources are the relatively recent description of B. jadranum and B. parallelum, their diminutive and inconspicuous habitus, and their possible misidentification in routine plankton counting. HIGHLIGHTS • Metabarcoding data of Tara Oceans and OSD discern Bacteriastrum species.• Pan-oceanic distribution of Bacteriastrum species according to global metabarcoding data.• Distribution patterns of phytoplankton species can be inferred from global metabarcode datasets.

FEMS Microbiology Ecology, Sep 26, 2016

powerpoint poster presenting a phylogeny of the diatoms with information about fossil record, lif... more powerpoint poster presenting a phylogeny of the diatoms with information about fossil record, life cycle, taxonomy and ecology

Environmental DNA, Mar 2, 2022

Diatoms’ bloom dynamics, with seasonal cycling of waxes and wanes of cell abundance, imply freque... more Diatoms’ bloom dynamics, with seasonal cycling of waxes and wanes of cell abundance, imply frequent bottleneck and expansion events that can leave signatures in the genetic structure and diversity of populations. We explored changes in genetic diversity and structure within multiple species of the planktonic marine diatom genus Pseudo‐nitzschia living in sympatry in the Gulf of Naples (Tyrrhenian Sea, Italy) over 48 sampling dates (from 2011 to 2013) by means of metabarcode data. The genus Pseudo‐nitzschia includes complexes of cryptic species along with morphologically distinguishable ones. We assessed the resolution power of the hypervariable V4 region of the 18S rDNA in delimiting species using different algorithms and a set of reference sequences. We measured intra‐specific genetic diversity and differentiation among species over three annual cycles. Between‐species divergence was higher in the P. pseudodelicatissima complex, while signs of incomplete lineage sorting and/or introgression were detected in the P. delicatissima complex. Most of the species showed significant population differentiation over time, due to changes in haplotypic composition over the three years. Some haplotypes were lost and new ones appeared, with high polymorphism in species of the P. delicatissima complex. We hypothesize that the observed temporal changes in genetic structure result from frequent founder events linked to a population dynamic characterized by cyclical alternation of clonal expansions and bottlenecks and discuss possible factors affecting the microevolutionary pathways in these planktonic diatoms.

Journal of Phycology, Jul 28, 2003

... Donato Marino passed away on 26 November 2002 after a long illness. ... Petit 1877 (1), Van H... more ... Donato Marino passed away on 26 November 2002 after a long illness. ... Petit 1877 (1), Van Heurck 18801885 (2), Wolle 1890 (3), De Toni 1891 (4), Cleve 1895 (5), Brun 1896 (6), Van Heurck 1896 (7), M. Peragallo 18971903 (8), Peragallo and Peragallo 18971908 (9), and ...

Journal of Phycology, Feb 1, 2003

VLIZ Special Publication, 2013

Marine Ecology, Mar 1, 2009

Journal of Phycology, Sep 6, 2013

Centric diatoms of the genus Leptocylindrus are common in the marine plankton worldwide. Only two... more Centric diatoms of the genus Leptocylindrus are common in the marine plankton worldwide. Only two species, L. danicus Cleve and L. minimus Gran, so far clearly belong to this genus, whose diversity has not been fully investigated. We investigated frustule and spore morphology as well as three nuclear- and three plastid-encoded markers of 85 Leptocylindrus strains from the Gulf of Naples, and one from the Atlantic US. The strains grouped into five molecularly distinct species with different levels of morphological differentiation. Two species matched the description of L. danicus and produced similar spores but differed in morphometric characters and sub-central pore position, supporting the description of L. hargravesii Nanjappa and Zingone as a distinct species. Leptocylindrus danicus var. apora French III and Hargraves, lacking a sub-central pore and not forming spores, was raised to the species level as L. aporus (French III and Hargraves) Nanjappa and Zingone. A fourth species with convex valves was described as L. convexus Nanjappa and Zingone. The fifth species matched the description of L. belgicus Meunier, considered as synonym of L. minimus. However, ultrastructural differences from all other Leptocylindrus supported the erection of the genus Tenuicylindrus Nanjappa and Zingone with T. belgicus (Meunier) Nanjappa and Zingone as type species. None of the sequences matched the L. minimus sequence in GenBank. The species analyzed showed different or partially overlapping seasonal distributions. Despite the addition of the new taxa, the ancient diatom lineage of the Leptocylindraceae shows a relative species poorness and considerable morphological stasis.