Species diversity of ostracods (Crustacea: Ostracoda) from rice fields in Northeast Thailand, with the description of a new Tanycypris species

Zootaxa ◽  
2017 ◽  
Vol 4362 (4) ◽  
pp. 499
Author(s):  
SUKONTHIP SAVATENALINTON
Keyword(s):  
Species Diversity ◽  
Rice Field ◽  
Lateral View ◽  
Rice Fields ◽  
Dorsal Margin ◽  
Northeast Thailand ◽  
The Third ◽  
Two Samples ◽  
High Species Richness ◽  
Very High

The species diversity of ostracods in rice fields from Northeast Thailand was studied. Fifty-two samples were collected from 43 rice fields during 2010–2016. This investigation revealed 23 genera and 52 species, including one new to science (Tanycypris eugenkempfi n. sp.) and 21 endemic species: endemic to the Oriental region (14 species), Southeast Asia (two species) and Thailand (five species). In addition, two species that were restricted to rice fields in this study were recognized: Bradleytriebella tuberculata (Hartmann, 1964) and Notodromas sinensis Neale & Zhao, 1991. The most diverse genus was Pseudostrandesia, followed by Strandesia with eight and five species, respectively. The most widely distributed species were Pseudocypretta maculata Klie, 1932 and Strandesia kraepelini (G.W. Müller, 1906) occurring in 48.8 % of the total of surveyed rice fields. The number of species in individual rice fields ranged from none to 18. Most of the samples contained three species, but one rice field showed very high species richness (18 species). Most of the species recorded in this study were also found in several types of water bodies and reported from several zoogeographical regions. The main distinguishing characters between Tanycypris eugenkempfi n. sp. and other Tanycypris species are the more tumid carapace in dorsal view, the distinctly arched dorsal margin of the carapace in lateral view, the presence of a subapical dorsal seta on the first segment of the first antenna, the smooth large bristles on the third endite of the maxillula, the absence of c-seta on the first thoracopod, and the long proximal claw (Gp) of the caudal ramus. 

hr KETERSEDIAAN FOSFOR PADA LAHAN PADI SAWAH BERDASARKAN INTENSITAS PENGGUNAANNYA DI KECAMATAN GERUNG KABUPATEN LOMBOK BARAT

2019 ◽  
Vol 12 (01) ◽  
pp. 90
Author(s):  
Habiburrahman Habiburrahman Habiburrahman
Keyword(s):  
Land Use ◽  
Strong Correlation ◽  
Positive Relationship ◽  
Rice Field ◽  
Phosphorus Availability ◽  
Rice Fields ◽  
Land Area ◽  
High Accumulation ◽  
Descriptive Method ◽  
Very High

This research was aimed to know the phosphorus availability in rice fields based on use intensity in Sub District of Gerung West Lombok Regency. The research conducted from February 2018 until April 2018 with 3 location criteria (Less Intensive, Intensive, Very Intensive). Method which used is descriptive method with survey technical. The results showed, the phosphorus availability on intensive rice field in all criteria location is range from high to very high containing. The land use with very intensive  (3 times plant) indicate very high accumulation of nutrient P with the range 85% of the land area was researched. Correlation of using SP36/TSP with  availability of P in each location criteria have a positive relationship and which have a very strong correlation ( r = 0.994) that is in Less Intensive location. Keywords : Phosphorus Availability, Intensive Rice Fields

scholarly journals Evolution of the species–rich Cape flora

2004 ◽  
Vol 359 (1450) ◽  
pp. 1623-1632 ◽  
Author(s):  
H. P. Linder ◽  
C. R. Hardy
Keyword(s):  
Phylogenetic Analysis ◽  
Species Diversity ◽  
Climatic Change ◽  
Plant Species ◽  
Late Miocene ◽  
Cape Floristic Region ◽  
The Third ◽  
Modern Species ◽  
Very High ◽  
General Explanation

The Cape Floristic Region (‘fynbos biome’) has very high levels of plant species diversity and endemism. Much of this diversity is concentrated in a relatively small number of clades centered in the region (Cape clades), and these form a vegetation called ‘fynbos’. The general explanation for the origin of this diversity is that much of it evolved in the Pliocene and Late Miocene in response to progressive aridification. We present a phylogenetic analysis of an almost complete species sample of the largest clade of Restionaceae, the third largest Cape clade. This indicates that the radiation of the Restionaceae started between 20 and 42 Myr ago, and since then there were no, or at most gradual, changes in the speciation rate in this clade. For seven other clades, the estimated starting dates for their radiation ranges from 7 to 20 Myr ago. Combining the radiation patterns for these clades shows that ca . 15% of the modern species evolved during the Pleistocene, and almost 40% since the beginning of the Pliocene. We suggest that these clades might have radiated in response to the fynbos vegetation increasing its extent in the Cape as a result of climatic change.

scholarly journals Identification of Soil Salinity Due to Seawater Intrusion on Rice Field in the Northern Coast of Indramayu, West Java

2013 ◽  
Vol 16 (2) ◽  
pp. 115-121
Author(s):  
Deddy Erfandi ◽  
Achmad Rachman
Keyword(s):  
Seawater Intrusion ◽  
Soil Salinity ◽  
Rice Field ◽  
High Salinity ◽  
Sea Water ◽  
Rice Fields ◽  
Survey Method ◽  
Northern Coast ◽  
West Java ◽  
Very High

The rice fields in Indramayu district is 55% of the district area. The average rainfall is 1590 mm per year. Most lands on the North Coast of Java (northern) were potentially affected by sea water intrusion. Extensive observations were 102.321 ha. Field observations were done by survey method. Observations had been conducted on rice fields Pantura, Indramayu, West Java. Soil salinity was measured by using the electromagnetic conductivity meter (EM-38). The results revealed that area had very high salinity which was 22.57%, closest to the beach Indramayu. In the South Region, soil salinity was lower, in accordance with the distance from the coastline. Some areas had a low, medium, and high salinity status in which 58.41%, 8.54% and 10.49%, respectively. Much of the research area had very high Sodium (Na) and ECe (0 - 30 cm) was between 1.37 to 16.38 dS m-1, while the ECe (30 - 70 cm) was between 1.11 to 17.40 dS m-1. This research was expected to assist in the agricultural development planning, especially in wetlands which have been affected by the intrusion of sea water (salinity). Planning for theimplementation of the development of rice varieties that are sensitive to high and very high salinity. Planning and improvement of irrigation networks as sources of clean water for washing the salts or pushing salt water into the sea.Keywords: Coast of Indramayu, rice field, seawater intrusion, soil salinity

scholarly journals A review of rice field ostracods (Crustacea) with a checklist of species

2017 ◽  
Author(s):  
Robin J. Smith ◽  
Dayou Zhai ◽  
Suktonthip Savatenalinton ◽  
Takahiro Kamiya ◽  
Na Yu
Keyword(s):  
Rice Field ◽  
Nutrient Recycling ◽  
Rice Fields ◽  
Negative Effects ◽  
Invasive Potential ◽  
Natural Habitats ◽  
Field Ecosystem ◽  
Rice Yields ◽  
Very High ◽  
Ostracod Species

<p class="Standard">Ostracods are very common in rice fields and they can have a significant influence on the rice field ecosystem. They can reach very high densities, often higher than other meiofauna, and their activities can have both positive and negative effects on rice harvests. They directly affect nutrient recycling through excretion, and indirectly by physically disturbing the soil and releasing minerals, thus improving rice growth. On the other hand, ostracods grazing on nitrogen-fixing cyanobacteria potentially reduce rice yields. Rice is a primary staple food for over half of the world’s population, and therefore ostracods can have a significant impact on human food supply. The origin of the rice field ostracod fauna is poorly known, but many rice field ostracods are considered invasive, especially in southern Europe, and from rice fields they have the potential to spread to surrounding natural habitats. Despite their invasive potential and ecological effects on the rice field ecosystem, very little is known about the diversity, ecology and impacts of rice field ostracods in many rice-producing countries. One hundred and ninety-two named ostracod species/subspecies have been<em> </em>reported from rice fields in 26 countries and states worldwide in the published literature; for over three-quarters of rice-producing countries, no data are readily available, and for most of the countries that have available data, diversity is clearly under-reported. Most species that have been documented from rice fields belong to the Cyprididae (78%), a family that makes up approximately 43% of the 2500+ non-marine ostracod species. A further six families<em> (Candonidae, Darwinulidae, Entocytheridae, Ilyocyprididae, Limnocytheridae </em>and<em> Notodromadidae) </em>form the remainder of rice field ostracods. Twenty-two percent of the species reported from rice fields are sexually reproducing, 18% have mixed reproduction, but are mostly asexual, and for 60% males are unknown, and are probably entirely asexually reproducing species. This review and checklist of rice field ostracods are presented to facilitate further research on this group in rice field habitats, research that is crucial for food security in many regions.</p>

Monte Carlo Algorithms for Moments of Transition Arrays

1988 ◽  
Vol 102 ◽  
pp. 79-81
Author(s):  
A. Goldberg ◽  
S.D. Bloom
Keyword(s):  
Monte Carlo ◽  
State Vector ◽  
Basis Vector ◽  
Collective State ◽  
Dispersion Characteristics ◽  
Dipole Strength ◽  
The Third ◽  
Monte Carlo Algorithms ◽  
Third Moment ◽  
Very High

AbstractClosed expressions for the first, second, and (in some cases) the third moment of atomic transition arrays now exist. Recently a method has been developed for getting to very high moments (up to the 12th and beyond) in cases where a “collective” state-vector (i.e. a state-vector containing the entire electric dipole strength) can be created from each eigenstate in the parent configuration. Both of these approaches give exact results. Herein we describe astatistical(or Monte Carlo) approach which requires onlyonerepresentative state-vector |RV&gt; for the entire parent manifold to get estimates of transition moments of high order. The representation is achieved through the random amplitudes associated with each basis vector making up |RV&gt;. This also gives rise to the dispersion characterizing the method, which has been applied to a system (in the M shell) with≈250,000 lines where we have calculated up to the 5th moment. It turns out that the dispersion in the moments decreases with the size of the manifold, making its application to very big systems statistically advantageous. A discussion of the method and these dispersion characteristics will be presented.

La experiencia del prácticum en educación infantil. Una narración en primera persona

2019 ◽  
pp. 60-76
Author(s):  
Victor Amar
Keyword(s):  
Early Childhood ◽  
Teacher Training ◽  
Early Childhood Education ◽  
Professional Growth ◽  
Childhood Education ◽  
The Third ◽  
Formative Experience ◽  
Narrative Methodology ◽  
Very High

The chances of success of the internship in early childhood education, which takes place in the third degree, are very high. However, there may be circumstances that may befall the teacher-training student, which in a way turn the formative experience into a pretext for personal and professional growth. In order to know and understand its practice, we use narrative methodology. It is the most suitable way we have found to share his voice, giving him epistemological authority and being a pretext to improve from his experience. Her words lead us to understand that she wants to be a teacher, and that she learns in any situation, even though her tutor is in a context and with a very particular reality. The conclusion is in continuous construction as the student has learned, disapproved and reappeared with the practice; from being a student of practice to becoming one in practice.

Effect of the Stages of Floral Development and Postharvest Temperatures to Flowering of Eremurus in Israel

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 536d-536
Author(s):  
Rina Kamenetsky
Keyword(s):  
Morphological Analysis ◽  
Developmental Disorder ◽  
Floral Development ◽  
The Third ◽  
Initial Stage ◽  
Floral Differentiation ◽  
Soil Temperatures ◽  
Very High ◽  
Development Application ◽  
Flowering Process

The influence of postharvest temperature on the flowering response of Eremurus was studied. The plants were harvested at four different stages of development and were separated into three groups. The first group was immediately exposed to 2 °C, the second group to 20 °C followed by 2 °C, and the third group to 20 °C followed by 32 °C and, subsequently, 2 °C. Scanning electron microscopy (SEM) was used for concurrent morphological analysis of floral development. Application of 2 °C to the plants in the initial stage of floral development caused plant destruction and death, while the same treatment applied at the stage of full differentiation promoted normal flowering. Temperatures of 20 °C and, especially, 32 °C, significantly improved flowering of the plants harvested in the early stages of florogenesis, whereas the same treatment applied to the plants harvested at the end of flower differentiation did not affect the flowering process. A developmental disorder, which we term “Interrupted Floral Development” (IFD), was observed only in the plants harvested when the racemes were fully differentiated. This was probably caused by the very high air and soil temperatures that prevail in Israel during the summer. The extent of floral differentiation has a determinant role in subsequent scape elongation and flowering.

Mutations Causing Constitutive Invertase Synthesis in Yeast: Genetic Interactions with snf Mutations

Genetics ◽  
1987 ◽  
Vol 115 (2) ◽  
pp. 247-253
Author(s):  
Lenore Neigeborn ◽  
Marian Carlson
Keyword(s):  
Regulatory Region ◽  
Constitutive Expression ◽  
Genetic Interactions ◽  
The Third ◽  
Recessive Mutations ◽  
Constitutive Mutation ◽  
Complementation Groups ◽  
High Level ◽  
Yeast Genetic ◽  
Very High

ABSTRACT We have selected 210 mutants able to grow on sucrose in the presence of 2-deoxyglucose. We identified recessive mutations in three major complementation groups that cause constitutive (glucose-insensitive) secreted invertase synthesis. Two groups comprise alleles of the previously identified HXK2 and REG1 genes, and the third group was designated cid1 (constitutive invertase derepression). The effect of cid1 on SUC2 expression is mediated by the SUC2 upstream regulatory region, as judged by the constitutive expression of a SUC2-LEU2-lacZ fusion in which the LEU2 promoter is under control of SUC2 upstream sequences. A cid1 mutation also causes glucose-insensitive expression of maltase. The previously isolated constitutive mutation ssn6 is epistatic to cid1, reg1 and hxk2 for very high level constitutive invertase expression. Mutations in SNF genes that prevent derepression of invertase are epistatic to cid1, reg1 and hxk2; we have previously shown that ssn6 has different epistasis relationships with snf mutations. The constitutive mutation tup1 was found to resemble ssn6 in its genetic interactions with snf mutations. These findings suggest that CID1, REG1 and HXK2 are functionally distinct from SSN6 and TUP1.

Effect of phenology on agonistic competitive interactions between invasive and native sheet-web spiders

2016 ◽  
Vol 94 (6) ◽  
pp. 427-434 ◽  
Author(s):  
Jeremy D. Houser ◽  
Adam H. Porter ◽  
Howard S. Ginsberg ◽  
Elizabeth M. Jakob
Keyword(s):  
Competitive Advantage ◽  
Native Species ◽  
Negative Impact ◽  
Relative Size ◽  
Agonistic Interactions ◽  
Resident Species ◽  
The Third ◽  
Linyphia Triangularis ◽  
Size Interaction ◽  
Very High

The phenologies of introduced relative to native species can greatly influence the degree and symmetry of competition between them. The European spider Linyphia triangularis (Clerck, 1757) (Linyphiidae) reaches very high densities in coastal Maine (USA). Previous studies suggest that L. triangularis negatively affects native linyphiid species, with competition for webs as one mechanism. We documented phenological differences between L. triangularis and three native species that illustrate the potential for the reversal of size-based competitive advantage over the course of the year. To test whether relative size influences interaction outcome, we allowed a resident spider to build a web and then introduced an intruder. We examined whether the outcomes of agonistic interactions over the webs were influenced by the species of the resident (invasive or native), the relative size of the contestants, and the species × size interaction. We found that the importance of relative size differed among species. In interactions between L. triangularis and each of two native species, size played a greater role than resident species on the outcome of interactions, suggesting that competitive advantage reverses over the season based on phenology-related size differences. Linyphia triangularis had a negative impact on the third species regardless of relative size.

Kebertahanan Subak di Era Globalisasi

2018 ◽  
Vol 1 (2) ◽  
pp. 125-144
Author(s):  
Wayan Windia
Keyword(s):  
Irrigation Water ◽  
Rice Field ◽  
Irrigation System ◽  
Green Revolution ◽  
Social Aspects ◽  
Land Conversion ◽  
Tourism Sector ◽  
Strategic Policy ◽  
External Intervention ◽  
Very High

Basically subak is a farmer-managed irrigation system in Bali. It is an entity managing some sites of rice field, getting irrigation water from one source, having subak temple, and getting an autonomy of internally and externally. It also has some natural bounderies. Subak as a socio-cultural institution has some strengths. But subak is very weak because of external intervention. The globalization (competition, pragmatism, materialism, etc) highly influences the subak existence. Now, irrigation water for subak is taken by tourism sector as water drinking industry and by the domestic used. Therefore water for subak is limited. Also, the land tax (pajak bumi dan bangunan) is very high, because the number of tax is based on rice fileld location. That is why land conversion in Bali is very high, about 750 ha/year. The problems and threats of subak in Bali are coming from tourism sector, green revolution concept, free trade, and biotechnology development. To increase the defensiveness and sustainability of subak needs a strategic policy in relation with parhyangan (values) aspects, pawongan (social) aspects, and palemahan (physical) aspects.

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