Abstract：
:Epilithic diatom communities are particularly suitable for the evaluation of freshwater quality. In Ecuador, however, no water quality index includes this biotic parameter. This work is the first attempt in the country to determine the composition of epilithic diatom communities associated with different degrees of eutrophication. This was accomplished by measuring physical, chemical and microbiological variables at five sampling sites along the Pita River, Ecuador, from August to December 2016. The results indicate a clear gradient of eutrophication from sampling sites P1 (good water) in the upper reaches to P5 (bad water) located in the lower reaches. Concerning diatom analyses, the results indicated a high diversity for tropical areas in terms of species richness, varying from S=34 in headwaters to S=42 downstream. Moreover, the results obtained suggest a lack of concordance with the trophic values given to some of the epilithic diatoms in the literature. There were also species that seem to be sensitive to downstream nutrient increases that were not considered as bioindicators in previous studies. We concluded that the trophic values of diatom species available in the scientific literature are not directly applicable to their sites in the Pita River. Hence, it is necessary to establish a trophic diatom index for the Andean region of Ecuador.
journal_name
C R Bioljournal_title
Comptes rendus biologiesauthors
Castillejo P,Chamorro S,Paz L,Heinrich C,Carrillo I,Salazar JG,Navarro JC,Lobo EAdoi
10.1016/j.crvi.2018.03.008subject
Has Abstractpub_date
2018-04-01 00:00:00pages
256-263issue
4eissn
1631-0691issn
1768-3238pii
S1631-0691(18)30053-2journal_volume
341pub_type
杂志文章abstract：:The first veterinary school in the world was created in Lyon in 1761 by an equerry, Claude Bourgelat (1712-1779), a man renowned for his skill in horsemanship and horse medicine, a man fully able to understand the issues of his time. Aware of the scope of the physiocratic movement and of the need to improve the health...
journal_title：Comptes rendus biologies
pub_type： 传,历史文章,杂志文章,评审
doi：10.1016/j.crvi.2012.02.005
更新日期：2012-05-01 00:00:00
abstract：:We propose to start the analysis of complex systems by systematically identifying the feedback circuits that govern their dynamics. These circuits can be identified without any ambiguity by examining the Jacobian matrix of the system. They provide precious information regarding the number and nature of steady states. ...
journal_title：Comptes rendus biologies
pub_type： 杂志文章
doi：10.1016/s1631-0691(02)01452-x
更新日期：2002-04-01 00:00:00
abstract：:Submerged fermentation in a stirred bioreactor of the white rot fungus Cerrena unicolor C-139 was done at a 120-L scale in the presence of wheat bran as a cheap lignocellulosic substrate for fungus growth and laccase production. Enzyme monitoring showed that laccase production started after 2 days of cultivation, atta...
journal_title：Comptes rendus biologies
pub_type： 杂志文章
doi：10.1016/j.crvi.2014.12.001
更新日期：2015-02-01 00:00:00
abstract：:The development of molecular biology placed in the foreground a mechanistic and deterministic conception of the functioning of macromolecules. In this article, I show that this conception was neither obvious, nor necessary. Taking Jacques Monod as a case study, I detail the way he gradually came loose from a statistic...
journal_title：Comptes rendus biologies
pub_type： 历史文章,杂志文章
doi：10.1016/j.crvi.2015.03.008
更新日期：2015-06-01 00:00:00
abstract：:This study aimed at showing the applicability of using a combination of four sampling methods (i.e., Winkler extractors, pitfall traps, baiting and manual collection), something most often conducted in the tropics, to create an inventory of ant species diversity in temperate environments. We recorded a total of 33 ant...
journal_title：Comptes rendus biologies
pub_type： 杂志文章
doi：10.1016/j.crvi.2007.08.012
更新日期：2007-12-01 00:00:00
abstract：:The authors' purpose will be here to underline the continuity of the adaptative processes that make Homo sapiens, sometimes a brilliant inventor, sometimes a mere imitator, forging tools already conceived by Nature itself. ...
journal_title：Comptes rendus biologies
pub_type： 杂志文章
doi：10.1016/j.crvi.2007.06.006
更新日期：2007-10-01 00:00:00
abstract：:The cardiac gland region in the stomachs of eleven babirusa (Babyrousa babyrussa) from zoological collections was studied by scanning and transmission electron microscopy. An array of tightly-packed, thin-walled tubes, closely resembling a 'honeycomb' covered this region. The tubes were between twelve and sixteen cell...
journal_title：Comptes rendus biologies
pub_type： 杂志文章
doi：10.1016/j.crvi.2007.10.007
更新日期：2008-01-01 00:00:00
abstract：:Periosteal bone histology expresses its rate of deposition. This fundamental relationship between bone structure and growth dynamics, first assumed by Amprino many decades ago, was quantified in preliminary studies, but never statistically tested. Moreover, the precise typological characters of bone tissue linked to g...
journal_title：Comptes rendus biologies
pub_type： 杂志文章
doi：10.1016/s1631-0691(02)01429-4
更新日期：2002-03-01 00:00:00
abstract：:Plectroctena minor workers have long mandibles that can snap and deliver a sharp blow to intruders or prey, stunning or killing them. Encounters between homocolonial P. minor workers separated for 24 h or 15 days never resulted in snapping, while this behaviour was always noted during encounters between heterocolonial...
journal_title：Comptes rendus biologies
pub_type： 杂志文章
doi：10.1016/s1631-0691(02)01484-1
更新日期：2002-07-01 00:00:00
abstract：:A fine regulation of the amiloride-sensitive Epithelial Sodium Channel (ENaC), made of alpha, beta and gamma subunits, is crucial for maintenance of Na+ balance and blood pressure. Both beta- and gamma-ENaC participate in negative regulation by interacting with Nedd4-2, an E3 ubiquitin-ligase. Disruption of this inter...
journal_title：Comptes rendus biologies
pub_type： 杂志文章
doi：10.1016/s1631-0691(03)00154-9
更新日期：2003-07-01 00:00:00
abstract：:A numerical simulation for the dynamics of a model that describes the sexual phase of Monogonont Rotifera reproduction is presented. The simulation is carried out by means of a numerical method based on the integration along the characteristic curves. The numerical experiments cover two basic situations: the existence...
journal_title：Comptes rendus biologies
pub_type： 杂志文章,评审
doi：10.1016/j.crvi.2003.08.006
更新日期：2004-03-01 00:00:00
abstract：:Few proteins have had such a strong impact on a field as the lac repressor has had in Molecular Biology. Over 40 years ago, Jacob and Monod [Genetic regulatory mechanisms in the synthesis of proteins, J. Mol. Biol. 3 (1961) 318] proposed a model for gene regulation, which survives essentially unchanged in contemporary...
journal_title：Comptes rendus biologies
pub_type： 历史文章,杂志文章,评审
doi：10.1016/j.crvi.2005.04.004
更新日期：2005-06-01 00:00:00
abstract：:This note presents a mechanistic explanation of the transition between the morphology of cephalochordates to that of amniotes. By a careful study of the morphogenetic movements which occur during the early stages of development of a typical amniote (a chicken embryo), we are able to show that the formation of a verteb...
journal_title：Comptes rendus biologies
pub_type： 杂志文章
doi：10.1016/j.crvi.2010.11.009
更新日期：2011-02-01 00:00:00
abstract：:A model of plant succession has been built for simulating the growth of six species, based on physiological processes such as photosynthesis, growth and maintenance respiration, carbon allocation, nitrogen absorption, fixation and remobilisation, organ mortality, seed dispersal and germination. The simulated global pl...
journal_title：Comptes rendus biologies
pub_type： 杂志文章
doi：10.1016/j.crvi.2005.07.008
更新日期：2006-01-01 00:00:00
abstract：:We used self-organizing maps (SOM, neural network) to bring out patterns of benthic macroinvertebrate diversity in relation to river pollution. Fourteen stations were sampled over various seasons in the Nestore drainage basin (Central Italy) and characterized for macroinvertebrate communities, nutrient and heavy metal...
journal_title：Comptes rendus biologies
pub_type： 杂志文章
doi：10.1016/j.crvi.2015.04.006
更新日期：2015-07-01 00:00:00
abstract：:Over the decades, basic research in life sciences has profited greatly from the study of the small unicellular fungal species Saccharomyces cerevisiae. This yeast turned out to be key for the identification and understanding of molecular mechanisms that underlay the basic functions of all eukaryotic cells. These inclu...
journal_title：Comptes rendus biologies
pub_type： 杂志文章,评审
doi：10.1016/j.crvi.2011.05.007
更新日期：2011-08-01 00:00:00
abstract：:We evaluated two biodiversity criteria, higher taxonomic diversity and phylogenetic diversity in French Guiana. For this, we used a recent assessment of the knowledge accumulated since 30 years of study on the amphibian species currently known in French Guiana. We focused on two well-represented genera, Hyla and Scina...
journal_title：Comptes rendus biologies
pub_type： 杂志文章
doi：10.1016/j.crvi.2005.07.005
更新日期：2005-10-01 00:00:00
abstract：:Any clinician dreams to obtain the regeneration of the destroyed organ for his patient. In the human being, the regeneration of complex structures is not possible, except the liver and the bone marrow, which can be regenerated because of the presence of adult stem cells in these tissues. The stem cells have two princi...
journal_title：Comptes rendus biologies
pub_type： 杂志文章,评审
doi：10.1016/j.crvi.2007.07.001
更新日期：2007-09-01 00:00:00
abstract：:Nonessential metal cadmium is widely used and released in the environment, causing cell toxicity and posing a severe threat to wildlife. Zebrafish (Danio rerio) is one of the most commonly used animals in the investigation of environmental cadmium toxicity in vertebrates. In this study, we identified two cadmium-respo...
journal_title：Comptes rendus biologies
pub_type： 杂志文章
doi：10.1016/j.crvi.2017.03.004
更新日期：2017-04-01 00:00:00
abstract：:Ancientness and maturity are two major qualities of forest ecosystems. They are components of naturalness and are affected by human impact. These qualities and the associated terms are often mixed up and incorrectly used. We have carried out a synthesis in order to propose an adapted French terminology based on intern...
journal_title：Comptes rendus biologies
pub_type： 杂志文章,评审
doi：10.1016/j.crvi.2014.10.004
更新日期：2015-01-01 00:00:00
abstract：:We test relationships between structure of acoustic signal used for individual recognition and nesting ecology among two gulls: the black-headed gull (Larus ridibundus), in which chicks remain in the nest, and the slender-billed gull (L. genei), in which chicks leave the nest after hatching to form crèches. A striking...
journal_title：Comptes rendus biologies
pub_type： 杂志文章
doi：10.1016/s1631-0691(03)00072-6
更新日期：2003-03-01 00:00:00
abstract：:Patterns of wear on the canine teeth were examined in 260 adult male babirusa skulls. Video recordings of 161 adult male babirusas at salt licks in North Sulawesi were viewed for behaviour related to erosion of the canine teeth. Corresponding observations were made of the behaviour of male babirusa in Antwerp and Sura...
journal_title：Comptes rendus biologies
pub_type： 杂志文章
doi：10.1016/j.crvi.2017.03.006
更新日期：2017-05-01 00:00:00
abstract：:Why was sexual selection so important to Darwin? And why was it de-emphasized by almost all of Darwin's followers until the second half of the 20th century? These two questions shed light on the complexity of the scientific tradition named "Darwinism". Darwin's interest in sexual selection was almost as old as his dis...
journal_title：Comptes rendus biologies
pub_type： 传,历史文章,杂志文章
doi：10.1016/j.crvi.2009.12.001
更新日期：2010-02-01 00:00:00
abstract：:The role of the eyes, and more precisely that of the ommatidian pigments, in the control of daily rhythms of movement of Daphnia longispina is investigated. In the laboratory, under permanent light (LL), the pigmentary modifications observed are globally similar to those observed in situ, except in their timing, aroun...
journal_title：Comptes rendus biologies
pub_type： 杂志文章
doi：10.1016/j.crvi.2003.09.037
更新日期：2003-12-01 00:00:00
abstract：:This article demonstrates how that the effectiveness of nervous system in doing the computations essential to an organism can be based on using algorithms that are readily implemented by nervous system 'device biophysics'. Collective effects and collective algorithms that exploit their dynamics provide powerful potent...
journal_title：Comptes rendus biologies
pub_type： 杂志文章,评审
doi：10.1016/s1631-0691(03)00017-9
更新日期：2003-02-01 00:00:00
abstract：:This article examines in a broad perspective entropy and some examples of its relationship to evolution, genetic instructions and how we view diseases. Living organisms are programmed by functional genetic instructions (FGI), through cellular communication pathways, to grow and reproduce by maintaining a variety of he...
journal_title：Comptes rendus biologies
pub_type： 杂志文章
doi：10.1016/j.crvi.2010.11.008
更新日期：2011-01-01 00:00:00
abstract：:We have isolated a cardiomyogenic cell line (CMG cell) from murine bone marrow mesenchymal stem cells. The cells showed a fibroblast-like morphology, but the morphology changed after 5-azacytidine exposure. They began spontaneous beating after 2 weeks, and expressed ANP and BNP. Electron microscopy revealed a cardiomy...
journal_title：Comptes rendus biologies
pub_type： 杂志文章
doi：10.1016/s1631-0691(02)01524-x
更新日期：2002-10-01 00:00:00
abstract：:In the present study, we have reported a simple, fast and efficient regeneration protocol using mature embryos as explants, and discovered its effective applicability to a range of Indica rice genotypes. We have considered the response of six varieties in the steps of the regeneration procedure. The results showed tha...
journal_title：Comptes rendus biologies
pub_type： 杂志文章
doi：10.1016/j.crvi.2015.04.004
更新日期：2015-07-01 00:00:00
abstract：:In atherosclerosis studies, there are few data, especially in men, on the biology of perivascular adipose tissue (PVAT) compared to that of other adipose tissue (AT), on amendments in obesity, and its possible role in the development of atherosclerosis. We conducted an ex vivo human study on pericarotid adipose tissue...
journal_title：Comptes rendus biologies
pub_type： 杂志文章
doi：10.1016/j.crvi.2017.01.001
更新日期：2017-03-01 00:00:00
abstract：:This study was undertaken to assess the risk of poisoning due to consumption of the puffer fish Lagocephalus lagocephalus collected along the Tunisian coast. Wistar rats were daily intraperitoneally injected, for 10 days, with acidic extracts of liver or flesh (muscles + skin) of L. lagocephalus. Control rats received...
journal_title：Comptes rendus biologies
pub_type： 杂志文章
doi：10.1016/j.crvi.2008.05.005
更新日期：2008-08-01 00:00:00
