Temporal changes in species composition in Fescue Prairie: relationships with burning history, time of burning, and environmental conditions

Plant Ecology ◽  
2009 ◽  
Vol 208 (1) ◽  
pp. 137-153 ◽  
Author(s):  
D. V. Gross ◽  
J. T. Romo
Keyword(s):  
Species Composition ◽  
Environmental Conditions ◽  
Temporal Changes

scholarly journals Temporal changes in DNA methylation and RNA expression in a small song bird: within- and between-tissue comparisons

BMC Genomics ◽  
2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Melanie Lindner ◽  
Irene Verhagen ◽  
Heidi M. Viitaniemi ◽  
Veronika N. Laine ◽  
Marcel E. Visser ◽  
...  
Keyword(s):  
Gene Expression ◽  
Dna Methylation ◽  
Environmental Conditions ◽  
Brain Regions ◽  
Temporal Changes ◽  
Egg Laying ◽  
Gene Body ◽  
Cpg Site ◽  
Repeated Sampling ◽  
Over Time

Abstract Background DNA methylation is likely a key mechanism regulating changes in gene transcription in traits that show temporal fluctuations in response to environmental conditions. To understand the transcriptional role of DNA methylation we need simultaneous within-individual assessment of methylation changes and gene expression changes over time. Within-individual repeated sampling of tissues, which are essential for trait expression is, however, unfeasible (e.g. specific brain regions, liver and ovary for reproductive timing). Here, we explore to what extend between-individual changes in DNA methylation in a tissue accessible for repeated sampling (red blood cells (RBCs)) reflect such patterns in a tissue unavailable for repeated sampling (liver) and how these DNA methylation patterns are associated with gene expression in such inaccessible tissues (hypothalamus, ovary and liver). For this, 18 great tit (Parus major) females were sacrificed at three time points (n = 6 per time point) throughout the pre-laying and egg-laying period and their blood, hypothalamus, ovary and liver were sampled. Results We simultaneously assessed DNA methylation changes (via reduced representation bisulfite sequencing) and changes in gene expression (via RNA-seq and qPCR) over time. In general, we found a positive correlation between changes in CpG site methylation in RBCs and liver across timepoints. For CpG sites in close proximity to the transcription start site, an increase in RBC methylation over time was associated with a decrease in the expression of the associated gene in the ovary. In contrast, no such association with gene expression was found for CpG site methylation within the gene body or the 10 kb up- and downstream regions adjacent to the gene body. Conclusion Temporal changes in DNA methylation are largely tissue-general, indicating that changes in RBC methylation can reflect changes in DNA methylation in other, often less accessible, tissues such as the liver in our case. However, associations between temporal changes in DNA methylation with changes in gene expression are mostly tissue- and genomic location-dependent. The observation that temporal changes in DNA methylation within RBCs can relate to changes in gene expression in less accessible tissues is important for a better understanding of how environmental conditions shape traits that temporally change in expression in wild populations.

Variability of size structure and species composition in Caribbean octocoral communities under contrasting environmental conditions

2018 ◽  
Vol 165 (2) ◽  
Author(s):  
Georgios Tsounis ◽  
Peter J. Edmunds ◽  
Lorenzo Bramanti ◽  
Bonnie Gambrel ◽  
Howard R. Lasker
Keyword(s):  
Species Composition ◽  
Environmental Conditions ◽  
Size Structure

scholarly journals The results of the introduction of Juglans mandshurica Maxim. into the oak-woods of the Khopyor region

2018 ◽  
Vol 11 ◽  
pp. 00030
Author(s):  
Anastasia Ovcharenko ◽  
Alevtina Ovcharenko
Keyword(s):  
Species Composition ◽  
Environmental Conditions ◽  
Flood Plain ◽  
Distribution Area ◽  
Juglans Mandshurica ◽  
Ecological Functions ◽  
Natural Distribution ◽  
The Stability ◽  
Selection Of Species ◽  
Selection Of

An analysis of the results of the introduction of Juglans mandshurica Maxim. into the flood-plain oak-woods of the Khopyor is conducted. The total bioecological assessment and prospects of the introduction into the natural flood-plain oak-woods of the Middle Khopyor region for the enrichment of their species composition with the aim of enhancing the sustainability of these ecosystems and optimization of their ecological functions are given. The compliance of the environmental conditions of the growth of introduced stands in the middle reaches of the Khopyor River, original within the natural distribution area is found. Alongside with the identified typical directions of reduction in the indicators of the stability and productivity of this breed in introduced centres in comparison with the natural areas there detected trends in increasing the resistance of the species in the succeeding generations, as a result of clone variability, a selection of species with a high vital potential and adaptive capacity.

scholarly journals Periphytic Diatoms in the Polluted Linggi (sensu stricto) and Kundor Rivers, Negeri Sembilan, Malaysia

2017 ◽  
Vol 32 (1) ◽  
pp. 60 ◽  
Author(s):  
I.S.A. NATHER KHAN
Keyword(s):  
Species Composition ◽  
Environmental Conditions ◽  
Abundant Species ◽  
Sensu Stricto ◽  
Diatom Assemblage ◽  
Artificial Substrates ◽  
Nitzschia Palea ◽  
Periphytic Diatoms ◽  
Species Composition And Distribution ◽  
Periphytic Diatom

The investigation in this paper aimed to describe periphytic diatom assemblage, species composition and distribution in tropical polluted Linggi (sensu stricto or s.s.) and Kundor rivers in  Negeri Sembilan, Malaysia.  Regardless of ecological and environmental conditions, diatoms were the numerically dominant flora among periphytic  algae  collected monthly over a period of 13 months at nine stations in the Linggi (s.s.) and Kundor rivers.  The freshwater periphytic diatom samples were collected mainly using artificial substrates and supplemented with natural substrates.  The periphytic diatoms thus collected from both natural and artificial substrates comprised 86 taxa (82 pennate and 4 centric forms) belonging to 21 genera. Of the 86 species, 71 species were found colonized in artificial substrates while the remaining 15 species were recorded exclusively on natural substrates. On the whole, the most common diatoms in both rivers combined were Eunotia vanheurckii, Gomphonema parvulum, Nitzschia palea, Pinnularia braunii, Navicula cryptocephala, Achnanthes saxonica, Achnanthes minutissima and Pinnularia microstauron.  The most abundant species were E. vanheurckii, N. palea, A. saxonica, G. parvulum and A. minutissima.

scholarly journals KOMPOSISI JENIS DAN FUNGSI PEKARANGAN (Studi kasus desa Giripurwo, Kecamatan Girimulyo, DI Yogyakarta)

2017 ◽  
Vol 4 (1) ◽  
pp. 77
Author(s):  
Junaidah Junaidah ◽  
P.Suryanto P.Suryanto ◽  
Budiadi Budiadi
Keyword(s):  
Species Composition ◽  
Environmental Conditions ◽  
Woody Plants ◽  
Timber Trade

Homegarden is one form of agroforestry complex which has a diverse structure and species composition. This research is aimed to (1) Determine the composition on 3 (three) levels development of homegarden, (2) Determine the function of crops on 3 (three) levels development of homegarden.  The sample location was done purposively based on the availability of data and information obtained in the field.  The number of homegarden which will be observed is 12 piece who representing 3 (three) levels development of homegarden, namely early homegarden, intermediate homegarden and advanced homegarden. Observations and measurements of vegetation used census (100%) on the entire plot. The results showed each level  development of homegarden have different  structure and composition of species. More advanced the level development of  homegarden, the number of woody plants increased while the number of crops decreased. This condition causes changes in the environmental conditions at under the stand. The function of homegardenat Giripurwo village is as a source of food, timber, trade commodities, spices, medicine, social, craft materials and ornamental plants.Pekarangan salah satu bentuk agroforestri komplek dimana memiliki struktur dan komposisi jenis yang sangat beragam. Penelitian ini bertujuan untuk (1) Mengetahui komposisi jenis pekarangan pada berbagai tingkat perkembangan, (2) Mengetahui  fungsi pekarangan pada berbagai tingkat perkembangan. Penentuan sampel lokasi penelitian dilakukan secara purposive berdasarkan ketersediaan data dan informasi yang diperoleh di lapangan. Pekarangan yang diamati berjumlah 12 buah yang mewakili 3 tingkat perkembangan pekarangan, yaitu: pekarangan awal, pekarangan menengah dan pekarangan lanjut. Pengamatan dan pengukuran vegetasi secara sensus (100 %) pada seluruh plot ukur. Hasil penelitian menunjukkan struktur dan komposisi pada tiap tingkat perkembangan pekarangan berbeda. Semakin lanjut tingkat perkembangan pekarangan, jumlah jenis tanaman berkayu meningkat sedangkan   jumlah  jenis tanaman semusim menurun. Kondisi ini menyebabkan perubahan kondisi lingkungan di bawah tegakan. Fungsi pekarangan bagi masyarakat Dusun Bulu, Desa Giripurwo adalah sebagai sumber pangan, penghasil kayu, komoditi perdagangan, rempah-rempah, obat-batan, sosial, bahan baku kerajinan dan tanaman hias.

Decapod Crustaceans of the Kara Sea: species composition and peculiarities of distribution

2021 ◽  
Vol 325 (3) ◽  
pp. 364-372
Author(s):  
O.L. Zimina
Keyword(s):  
Species Composition ◽  
Environmental Conditions ◽  
Kara Sea ◽  
Individual Species ◽  
Snow Crab ◽  
Western Slope ◽  
Depth Range ◽  
Ecological Groups ◽  
Decapod Crustaceans ◽  
Wide Range

This paper presents data on species composition and peculiarities of distribution of Decapoda in the southern part of Kara Sea obtained during trawl surveys in 2012 and 2016. In total, 11 species of decapod crustaceans were collected. In the last decade the fauna has been enriched by the invasion of the snow crab Chionoecetes opilio. Brief information on the environmental conditions of occurrence and maps of distribution in the studied area are presented for each species. The highest values of species richness (up to 6 species per catch), biomass and abundance of decapods were detected on the western slope of Priyamal shallow at 50–150 m depth range. According to the patterns of distribution and environmental conditions, three groups of species were distinguished: associated with cold and salty waters of Novaya Zemlya Trough; inhabiting lower salinity waters with a wide temperature range of the Priyamal and Ob-Yenisei shallows; and a group that is widespread within the area in wide range of conditions. In comparison with the neighboring Barents Sea, the decapod fauna of the Kara Sea is qualitatively and quantitatively depleted. The obtained data on the distribution of individual species and ecological groups can be used for the background assessment of the state of the decapod fauna, including the period of population formation of the alien species.

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