Ecological Differentiation of Cryptic Species within an Asexual Protist Morphospecies: A Case Study of Filamentous Green Alga Klebsormidium (Streptophyta)

2013 ◽  
Vol 60 (4) ◽  
pp. 350-362 ◽  
Author(s):  
Pavel Škaloud ◽  
Fabio Rindi
Keyword(s):  
Cryptic Species ◽  
Green Alga ◽  
Ecological Differentiation ◽  
Filamentous Green Alga

Acentropus niveus (Oliv.) (Lepidoptera: Pyralidae) on the north shore of Lake Erie with a consideration of its distribution in North America

1950 ◽  
Vol 82 (12) ◽  
pp. 250-252 ◽  
Author(s):  
W. W. Judd
Keyword(s):  
North America ◽  
Green Alga ◽  
Lake Erie ◽  
Filamentous Green Alga ◽  
North Shore ◽  
The North ◽  
Lepidoptera Pyralidae ◽  
Shallow Bay ◽  
The Village ◽  
The Waves

On July 12, 1950 a collection of adults of the moth Acentropus niveus (Oliv.) was made on the north shore of Lake Erie near the village of South Cayuga, Ontario (Maps A, B-3). At the southern limits of the townships of Dunn and South Cayuga (Haldimand County) a shallow bay extends for a distance of about two miles along the shore of the lake (Map A). Along this bay is a sandy or gravelly beach ten to twenty yards wide backed by a cliff of clay that rises abruptly above the beach. On the day the collections were made the sky was clear and a brisk southerly breeze was causing waves to wash on the beach. The action of the waves had deposited debris, consisting largely of tangled masses of a filamentous green alga and exuviae of the mayfly Hexagenia occulta, in a windrow six inches to two feet wide along the shore. The moths ere found in this debris, most of them lying dead and with bedraggled wings, while some lay on their backs with wings stuck to the damp surface and with legs kicking and a few were crawling about on the debris.

Salinity effects on the coexistence of cryptic species: a case study on marine nematodes

2011 ◽  
Vol 158 (12) ◽  
pp. 2717-2726 ◽  
Author(s):  
N. De Meester ◽  
S. Derycke ◽  
D. Bonte ◽  
T. Moens
Keyword(s):  
Cryptic Species ◽  
Marine Nematodes ◽  
Salinity Effects

scholarly journals New data on distribution, morphology and ecology of Oedogonium capillare Kützing ex Hirn (Oedogoniales, Chlorophyta) in Poland

2015 ◽  
Vol 40 (1) ◽  
pp. 21-26
Author(s):  
Pikosz Marta ◽  
Messyasz Beata
Keyword(s):  
Green Alga ◽  
High Variability ◽  
Taxonomic Identification ◽  
Vegetative Cells ◽  
Filamentous Green Alga ◽  
Alga Species ◽  
Wide Ph Range ◽  
Ph Range ◽  
Comprehensive Study

Abstract Algological investigations were focused on taxonomy, chorology and ecology of threatened filamentous green alga species in Poland. Studies on Oedogonium capillare Kützing ex Hirn growing in large quantities in association with Cladophora rivularis (Linnaeus) Hoek in pond were conducted. The aim of these studies was to describe the distribution, ecology and morphology of O. capillare as part of a more comprehensive study of this filamentous green alga. It is the eighth record in Poland for O. capillare. Filaments of O. capillare were grown over a wide pH range (7.3-9.6) and in high variability of nutrients. Vegetative cells, oogonia and antheridia were observed, which allowed taxonomic identification. O. capillare occurs in eutrophic waters which requires protection of its habitat.

Comparative mitogenomic analysis reveals cryptic species: A case study in Mactridae (Mollusca: Bivalvia)

2014 ◽  
Vol 12 ◽  
pp. 1-9 ◽  
Author(s):  
Xin Shen ◽  
Xue Ping Meng ◽  
Ka Hou Chu ◽  
Na Na Zhao ◽  
Mei Tian ◽  
...  
Keyword(s):  
Cryptic Species

scholarly journals A LARGE SCALE QUASI-CRYSTALLINE LAMELLAR LATTICE IN CHLOROPLASTS OF THE GREEN ALGA ZYGNEMA

1970 ◽  
Vol 45 (3) ◽  
pp. 522-531 ◽  
Author(s):  
Robert J. Mclean ◽  
George F. Pessoney
Keyword(s):  
Internal Structure ◽  
Green Alga ◽  
Thylakoid Membrane ◽  
Large Scale ◽  
Three Dimensional ◽  
Prolamellar Body ◽  
Dimensional Lattice ◽  
Filamentous Green Alga ◽  
Prolamellar Bodies ◽  
Single Membrane

A quasi-crystalline lamellar lattice was observed in chloroplasts of the filamentous green alga Zygnema. The lattice does not appear in the cells until cultures are at the end of the log phase of growth. Pseudograna are also present and become more numerous towards the middle of the log phase. The three-dimensional lattice superficially resembles the configuration of cubic prolamellar bodies but is about 10 times larger and is entirely different in internal structure. The lattice is composed of one or two appressed thylakoids in a stroma matrix which is bounded on each side by a single thylakoid membrane. This multilayered sandwich of membranes and matrix occupies a position equivalent to the single membrane of a cubic prolamellar body.

scholarly journals Use of a filamentous green alga (Chaetomorpha sp.) and microsnail (Stenothyra sp.) as feed at an early stage of intensive aquaculture promotes growth performance, artificial feed efficiency, and profitability of giant tiger prawn (Penaeus monodon)

PLoS ONE ◽  
2020 ◽  
Vol 15 (12) ◽  
pp. e0244607
Author(s):  
Isao Tsutsui ◽  
Dusit Aue-umneoy ◽  
Piyarat Pinphoo ◽  
Worachet Thuamsuwan ◽  
Kittipong Janeauksorn ◽  
...  
Keyword(s):  
Green Alga ◽  
Feed Efficiency ◽  
Penaeus Monodon ◽  
Feed Consumption ◽  
Control Group ◽  
Benthic Organisms ◽  
Shrimp Culture ◽  
Filamentous Green Alga ◽  
Tiger Prawn ◽  
Intensive Aquaculture

With the worldwide demand for tropical penaeid prawn increasing in recent decades, more research on shrimp culture methods is needed to enhance efficiency and profitability for shrimp farmers. The objective of this study was to develop a technique to boost the productivity, feed efficiency, and profitability of the giant tiger prawn (Penaeus monodon). To accomplish this, a novel culture setup was established in which two benthic organisms, a filamentous green alga (Chaetomorpha sp.) and a microsnail (Stenothyra sp.), were propagated together with P. monodon post-larvae during an early culture stage and then offered to shrimp as supplementary live feeds in intensive aquaculture ponds. For the experiment, shrimp post-larvae (density: approximately 33 individuals m-2) were cultured in outdoor concrete ponds (9 × 9 × 1.2 m) under either control (fed only artificial feed, n = 3) or experimental (fed artificial feed and benthic organisms, n = 3) conditions until they reached marketable size (15 weeks). Apparent green algae consumption was 6.81 kg (8.4% green alga to total feed consumption), whereas microsnail consumption was 1.96 kg (2.4% microsnail to total feed consumption). Compared with the control group of giant tiger prawn, the experimental group showed significantly higher productivity (total number of shrimp produced: 118%; total shrimp production: 133%), feed efficiency (feed conversion ratio of artificial shrimp feed: 89%), and profitability (shrimp sales: 139%; balance between shrimp sales and costs: 146%), while labor and financial costs were kept minimal. These results can be explained by the enhanced growth of shrimp at the early stages of culture. The techniques developed in this study will help to advance the efficiency of intensive aquaculture operations for giant tiger prawn and also improve profitability for shrimp farmers.

Genomic, chromosomal, and ecological differentiation between the cryptic Eurasian malaria vector-species Anopheles messeae and Anopheles daciae

2019 ◽  
Author(s):  
Anastasia N. Naumenko ◽  
Dmitriy A. Karagodin ◽  
Andrey A. Yurchenko ◽  
Anton V. Moskaev ◽  
Olga I. Martin ◽  
...  
Keyword(s):  
Reproductive Isolation ◽  
Cryptic Species ◽  
X Chromosome ◽  
Malaria Vector ◽  
Genomic Sequence ◽  
Wide Distribution ◽  
Its2 Sequence ◽  
Genetic Introgression ◽  
Nucleotide Substitutions ◽  
Ecological Differentiation

Abstract Background A dominant malaria vector, Anopheles messeae, is a highly polymorphic species with wide distribution throughout Eurasia. Five highly polymorphic inversions associated with the geographical distribution of the species have been reported. A sister species, An. daciae, was described and discriminated from An. messeae based on five fixed nucleotide substitutions in the internal transcribed spacer 2 (ITS2) of ribosomal DNA. However, the levels of genomic divergence, chromosomal variation, and ecological differentiation between these two cryptic species remain unexplored. Results In this study, we sequenced ITS2 and analyzed the inversion frequencies of 289 Anopheles larvae specimens collected from three locations in the Moscow region. We identified a high abundance of both An. messeae and An. daciae in all three locations. Five individual genomes for each species of An. messeae and An. daciae from one location were sequenced. Our study confirmed five previously described nucleotide substitutions in the ITS2 of An. messeae. However, we found that the ITS2 sequence in An. daciae was heterogenic in three of the five positions. Fixed nucleotide differences between An. messeae and An. daciae were found only in the last two positions. One mosquito was identified as a hybrid between An. messeae and An. daciae based on heterogeneous substitutions in all five positions. Although, the genomic sequence comparison demonstrated genome-wide divergence between the two species, which is especially pronounced on the X chromosome, an ADMIXTURE cluster analysis demonstrated the presence of two admixed individuals suggesting ongoing hybridization. Cytogenetic analysis demonstrated that An. messeae and An. daciae significantly differ from each other by their frequency of polymorphic inversions. Inversion X1 was fixed in An. messeae but was polymorphic in all An. daciae populations. The frequency of polymorphic autosomal inversions was higher in An. messeae than in An. daciae. The species composition was different among the studied locations suggesting species-specific ecological preferences. Conclusions Our study demonstrated that An. messeae and An. daciae represent closely related cryptic species with incomplete reproductive isolation that are able to maintain genomic differentiation in sympatry despite ongoing genetic introgression. The X chromosome plays an important role in the reproductive isolation between the species.

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