检索结果-南通市图书馆

Journal of Earth Science 2024年

作者： FLORES Daniel Germán OCA?A Raúl Emmanuel MELIáN Edgardo ORTEG Andrés ESPER ANGILLIERI María Yanina PITTALUGA María Alejandra CIGEOBIO (CONICET-UNSJ) Av.José I.de la Roza y Meglioli gabinete de Geología Ambiental INGEO Universidad Nacional de San Juan Av.José I.de la Roza y Meglioli

The Monte desert is characterized by a great diversity of landforms created with fluvial， alluvial which the vegetation patterns are related to. The present work has the following objectives: 1: determine whether topographical attributes， surface characteristics， soil properties and vegetation patterns vary between alluvial landforms， and 2: define whether morphometric， soil and surface properties influence vegetation patterns along alluvial landscape. Morphometric data were obtained by processing a 5 m digital elevation model. The coverage of rock fragments， fine sediments and mulch was quantified. Observations and descriptions of the soil profiles were restricted to the uppermost 50 cm. Vegetation properties were calculated using a Point Quadrat Method. The relationship between variables was evaluated through multivariate statistical analysis. The main results show the presence of 45 plant species distributed in 19 families， where shrubs are dominant. The wind effect， topographic wetness and dissection of the landscape are limiting factors of diversity. The coverage of superficial rock fragments influence vegetation coverage through the distribution and availability of rainwater. Furthermore， the different soil textures reveal that the silt content favors an increase in vegetation coverage. The presence of V horizon could condition the installation and development of vegetation in the early stages of growth.

关键词：

Sex-dependent resilience to extreme drought events: implications for climate change adaptation of a South American endangered tree species

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Ecological Processes 2024年第2期 48-60页

作者： Sergio Piraino Martín Ariel Hadad Yanina Antonia Ribas-Fernández Fidel Alejandro Roig Laboratorio de dendrocronología e Historia Ambiental (IANIGLA CONICET ) Facultad de Ciencias Agrarias Universidad Nacional de Cuyo Laboratorio de dendrocronología de Zonas áridas (CIGEOBIO CONICET ) Gabinete de Geología Ambiental (INGEO UNSJ) Hémera Centro de Observación de la Tierra Facultad de Ciencias Universidad Mayor

Background Recent changes in climatic trends are resulting in an increased frequency and intensity of extreme events, with unknown effect on ecosystem dynamics in the near future. Extreme drought episodes are recognized as disturbance factors capable of modifying forest dynamics and tree growth. Within this context, dioecious tree species may be impacted by climatic extremes, affecting male/female proportions and, consequently, reproductive processes and species persistence. Therefore, there is an urgent need for species-specific assessments of growth tolerance to extreme dry spells in dioecious tree species, to establish effective conservation strategies for these particular natural resources. Araucaria araucana(araucaria), an endangered dioecious Patagonian tree species, has recently undergone decay and mortality episodes in response to increasing dry climatic conditions. While sex-dependent tolerance to extreme drought episodes has been assessed in the species' humid distribution range, there is still a lack of information on the gender-based resilience of trees growing in the drier environments of the species' *** We reconstructed, through dendrochronological methods, the sex-dependent response of 105 araucaria individuals(55 female and 50 male trees) to five regional extreme dry spells employing a set of different indices. Resistance, recovery period, and average growth reduction of standardized tree-ring growth were examined, analysing the effect of biotic(sex, pre-drought stem tree growth) and abiotic(local climatic conditions before, during, and after extreme climatic episodes) factors on tree *** Sex influences only the species resistance to climatic disturbance, with male individuals showing lower tolerance to extreme drought events. Pre-drought radial growth rates and local meteorological conditions preceding, during, and following extreme dry spells strongly modulated araucaria radial growth resilience regardless of tree s

关键词：

Dominant Macroalgae in Bahía de Cochinos, Matanzas, Cuba

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2022年第6期13卷 797-814页

作者： Yusimí Alfonso Patricia González Sánchez Hansel Caballero Aragón Pedro Chevalier Jhoana Díaz-Larrea Ruben Cabrera Acuario Nacional de Cuba La Habana Cuba Unidad Iztapalapa Departamento de Hidrobiología Universidad Autónoma Metropolitana Cd de México México gabinete de arqueología Oficina del Historiador de la Ciudad Habana Vieja Cuba

Spatial-temporal variations of macroalgae were analyzed in a study conducted in Cueva de Los Peces (CP) and Punta Perdiz (PP), two dive sites located on the eastern coast of Bahía de Cochinos. The most conspicuous species found from 3 to 20 m depths were present in the biotopes of ridges and shallow and deep terraces. Sampling was carried out in September 2014, and March and October 2016 by autonomous diving and direct methods. Qualitative visual censuses and quantitative analyzes were used to estimate the coverage (%) of the genera according to the AGRRA methodology with the use of the 10 m linear transect and quadrats as the sampling unit. The first list of macroalgae for the area is offered that includes 49 taxa of which 10 were Rhodophyta, 10 Ochrophyta (Phaeophyceae), and 29 Chlorophyta. The dominant genera during the study period were Halimeda, Dictyota, Lobophora, and Udotea. Spatial differences were found regarding the specific composition. Temporal variations were evidenced in terms of the relative abundance of the genera present, which reveals temporal changes in the qualitative structure, where some species replace others. The information obtained is pioneering and can serve as a comparative baseline for future monitoring of the area.

关键词： Cuba Macroalgae Spatial-Temporal Variations Species List

Relationship of Trace Elements Concentration and Growth Rate in Alsidium triquetrum (Rhodophyta)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2023年第3期14卷 323-338页

作者： Arsenio J. Areces Ruben Cabrera Jhoana Díaz-Larrea Ligia Collado-Vides Instituto de Geografía Tropical Ministerio de Ciencia Tecnología y Medio Ambiente Municipio Playa Ciudad Habana Cuba gabinete de arqueología Oficina del Historiador de la Ciudad Habana Vieja Cuba Unidad Iztapalapa Departamento de Hidrobiología Universidad Autónoma Metropolitana Ciudad de México México department of Biological Sciences and Institute of Environment Florida International University Miami FL USA

Minerals and trace elements content and concentration in marine algae vary depending on species morphology and physiology;as well as growing environmental conditions. despite this variability, accumulation of magnesium, and especially iron, seems to be common in Chlorophyta;while Rhodophyta and Heterokontophyta show higher affinity to manganese. The red agarophyte Alsidium triquetrum was used to analyze the relationship between metal concentration, environmental conditions and growth rate. Specimens grown in situ showed a large variability of Fe, Mn, Mg, and Al, in thallus tissue concentrations. Further, a compelling relationship between the growth rate and the thallus concentration of Mg and Mn, Zn, and Al was detecte. Manganese, unlike the other trace elements analyzed showed a positive linear relationship between growth rate and tissue content during the period of greatest vegetative growth.

关键词： Alsidium Growth Rate Manganese Trace Elements

Population Dynamics of Colonizing Fauna and Its Effect on Growth Rates of the Farmed Red Alga Alsidium triquetrum (S. G. Gmelin) Trevisan

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Natural Science 2022年第2期14卷 42-55页

作者： Ruben Cabrera Arsenio J. Areces Jhoana Díaz-Larrea Sunil Kumar Sahu Juan Ricardo Cruz-Aviña Laura G. Nuñez García gabinete de arqueología Oficina del Historiador de la Ciudad Habana Vieja Cuba Instituto de Geografía Tropical Ministerio de Ciencia Tecnología y Medio Ambiente Municipio Playa Ciudad Habana Cuba departamento de Hidrobiología Universidad Autónoma Metropolitana Unidad Iztapalapa CBS Cd de México México State Key Laboratory of Biocontrol Guangdong Key Laboratory of Plant Resources School of Life Science Sun Yat-Sen University Guangzhou China Facultad de Medicina Veterinaria y Zootecnia BUAP Laboratorio de Medicina de la Conservación Licenciatura en Medicina Veterinaria y Fauna Silvestre Km. 7.5 Carretera Ca&ntilde ada Morelos El Salado Tecamachalco Puebla Mexico

Herbivores can drastically alter the morphology of macroalgae by directly consuming tissue and by inflicting structural wounds. Macroalgae host abundant and diverse epibiont communities, the dynamics of which tend to be mostly unknown in space and time. As the cultivation of macroalgae gains momentum worldwide, it is key to measure how epibionts could affect algal performance. We examined the epibiont community associated with farmed Alsidium triquetrum, a red macroalga with growing pharmacological interest. Measurements were conducted over two independent 60-day periods, one in summer and one in winter. Epibionts showed different patterns of succession in both seasons. Crustaceans, mainly amphipods, showed the highest overall density, with deleterious effects on daily growth rates of A. triquetrum in winter. Adverse effects as a function of epibionts were not detected in summer. A. triquetrum is a perennial alga. However, its performance as a crop in the nearshore can be significantly affected by the epibiont community structure that persists in winter. Amphipods and ascoglossan molluscs were risk factors in the mariculture of this agarophyte. In winter, they can destroy plants when they reach more than five individuals per gram of fresh biomass. Results highlight that commercial farming of A. triquetrum would be successful if grown throughout the summer.

关键词： Cultivation Epifauna Macroalgae Macroinvertebrates Seaweed Mariculture

Consensus delphi study on guidelines for the assessment of anterior cruciate ligament injuries in children

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Orthopedics 2022年第9期13卷 777-790页

作者： Angélica Campón Chekroun Jorge Velázquez-Saornil Isabel Guillén Vicente Zacarías Sánchez Milá David Rodríguez-Sanz Carlos Romero-Morales Tomas Fernandez-Jaén JoséIgnacio Garrido González MiguelÁngel Sánchez-Garrido Pedro Guillén García Campus San Jerónimo Guadalupe Universidad Católica de MurciaMurcia 30107MurciaSpain department of Physiotherapy Universidad Católica deÁvilaÁvila 05005ÁvilaSpain department of Orthopaedic and Trauma Surgery Clínica CemtroMadrid 28035MadridSpain Nursing Physiotherapy and PodiatryUniversidad Complutense de MadridMadrid 28040MadridSpain department of Physical Therapy Universidad Europea de MadridMadrid 28023MadridSpain department of Orthopaedic and Trauma Surgery Gabinete Médico GarridoSalamanca 37003SalamancaSpain

Background:Knee examination guidelines in minors are intended to aid decisionmaking in the management of knee *** question:A delphi study was conducted with a formal consensus process using a validated methodology with sufficient scientific evidence.A group consensus meeting was held to develop recommendations and practical guidelines for use in the assessment of instability injuries in *** findings:there is a lack of evidence to analyse anterior cruciate ligament injuries in children and their subsequent surgical management if *** guidelines and clinical assessment of the patient based on a thorough examination of the knee are performed and a guide to anterior cruciate ligament exploration in children is *** application:In the absence of a strong evidence base,these established guidelines are intended to assist in that decision-making process to help the clinician decide on the most optimal treatment with the aim of benefiting the patient as much as *** this expert consensus,surgical treatment is advised when the patient has a subjective sensation of instability accompanied by a pivot shift test++,and may include an anterior drawer test+and a Lachman test+.If these conditions are not present,the conservative approach should be chosen,as the anatomical and functional development of children,together with a physiotherapy programme,may improve the evolution of the injury.

关键词： Anterior cruciate ligament Diagnoses and examinations Sports injuries Knee Injury to minors

基于白扦树轮蓝光强度的中国华北暖季温度重建

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Geographical Sciences 2023年第12期33卷 2511-2529页

作者：陈巧湄岳伟鹏陈峰马丁·哈达德菲德尔·罗伊格赵晓恩胡茂曹红华 Yunnan Key Laboratory of International Rivers and Transboundary Eco-Security Institute of International Rivers and Eco-SecurityYunnan UniversityKunming650500China Key Laboratory of Tree-ring Physical and Chemical Research of the Chinese Meteorological Administration/Xinjiang Laboratory of Tree-ring Ecology Institute of Desert MeteorologyChinese Meteorological AdministrationUrumqi830002China Laboratorio de dendrocronología de ZonasÁridas CIGEOBIO(CONICET-UNSJ) Gabinete de Geología Ambiental(INGEO-UNSJ)San JuanArgentina Laboratorio de dendrocronología e Historia Ambiental IANIGLA-CCT CONICET-Universidad Nacional de CuyoMendozaArgentina Hémera Centro de Observación de la Tierra Escuela de Ingeniería ForestalFacultad de CienciasUniversidad MayorHuechurabaSantiagoChile

In the past 30 years,observational climate datasets reveal a significant a drying and warming trend over in North *** of climatic variability over North China and its driving mechanism in a long-term perspective is,however,limited to a few sites only,especially the lack of temperature reconstructions based on latewood density and blue *** this study,we developed a 281-year latewood blue intensity chronology based on 45 cores of Picea meyeri in western North *** on the discovery that the warm season(May–August)mean maximum temperature is the main controlling factor affecting the change in blue light reflection intensity,we established a regression model that explained 37%of the variance during the calibration period(1950–2020),allowing to trace the mean maximum temperature up to 1760 *** the past 261 years,we identified seven persistent high temperature periods(1760–1773,1778–1796,1805–1814,1869–1880,1889–1934,1984–2000,2004–2020)and three persistent low temperature periods(1815–1868,1935–1963,1969–1983)in North *** of a nearby temperature reconstructions and climate gridded data indicate that our reconstruction record a wide range of temperature variations in North *** analysis of links between large-scale climatic variation and the temperature reconstruction showed that there is a relationship between extremes in the warm season temperature and anomalous SSTs in the equatorial eastern Pacific,and implied that the extremes in the warm season temperature in North China will be intensified under future global warming.

关键词： blue intensity Picea meyeri mean maximum temperature North China dendroclimatology

维普期刊数据库

Influence of the Macronutrients N, P and K on the Agarophyte <i>Alsidium triquetrum</i>(S. G. Gmelin) Trevisan, during Experimental Culture

在线全文

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2021年第4期12卷 573-585页

作者： Ruben Cabrera Arsenio J. Areces Jhoana Díaz-Larrea Laura Nuñez García J. Ricardo Cruz-Aviña gabinete de arqueología Oficina del Historiador de la Ciudad Habana Vieja Cuba Instituto de Geografia Tropical Ministerio de Ciencia Tecnología y Medio Ambiente Ciudad Habana Cuba Unidad Iztapalapa Departamento de Hidrobiología Universidad Autónoma Metropolitana Cd de México México departamento de Recursos Naturales Academia de Investigación y Ciencia Universidad Tecnológica de Calakmul Calakmul México

The knowledge of the nutritional requirements and their relation to the physiology of marine algae growth is key to incorporate new species into aquaculture, whose dynamics tend to be largely unknown. The use of Alsidium triquetrum in the pharmacological industry depends on its availability in the natural environment, occasionally scarce. As macroalgae cultivation gains momentum worldwide, it is important to know how the effects of nutrients are modulated in the thallus during cultivation. The linking of the relative growth rates (RGR) of A. triquetrum and their relation with the macronutrients N (nitrogen), P (phosphorus) and K (potassium) at the tissue level under culture conditions constitutes the main contribution of this article. P levels tend to decrease as the plant completes its development. Both the concentration of N and P are higher in the stipe for the month of July, N (25.31 ± 0.26) vs P (0.846 ± 0.02) period when the highest vegetative development is reached. The N and P modulate the patterns of the species’ development over the annual cycle, unlike K, which is not considered a limiting factor. When the temperature and lighting are not favorable for growth, the plant simply accumulates these compounds. As environmental conditions change, these stored compounds are actively used in their growth. The specimens with an initial weight of 50 g present the best accumulated biomass (RGR) throughout the annual cycle.

关键词： Alsidium triquetrum Culture Phosphorus Macronutrients Nitrogen Potassium Growth Rate

Preliminary study of gravimetric anomalies in the Magallanes-Fagnano fault system,South America

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geodesy and Geodynamics 2018年第1期9卷 42-49页

作者： Juan Manuel Alcacer María Romina Onorato Laura P.Perucca Silvia Miranda CONICET-Av.lgnacio de La Roza(oeste)590 J5402DCSSan JuanArgentina departmento Geofisica Universidad Nacional de San JuanAv.Ignacio de ga Roza(oeste)590J5402DC5San JuanArgentina CIGEOBIO-CONICET Gabinete de Neotect6nica y Geomorfologfa(INGEO)Facultad de Ciencias ExactasFfsicas y NaturalesUniversidad Nacional de San JuanAv.lgnacio de La Roza(oeste)590J5402DCSSan JuanArgentina

The main objective of this research is to recognize several geological structures associated with the shear zones of the MFFS（Magallanes-Fagnano fault system） by the analysis and interpretation of gravimetric anomalies. Besides, to compare the gravimetrical response of the cortical blocks that integrate the region under study, which is related to the different morphotectonic domains recognized in the region. This research was developed employing data obtained from World Gravity 1.0, which includes earth and satellite gravity data derived from the EGM2008 model. The study and interpretation of the MFFS from the analysis and processing of the gravimetric data, allowed appreciation of a noticeable correlation with the most superficial cortical structure.

关键词： Gravimetry Isostatic anomaly Magallanes-Fagnano fault system Argentina

维普期刊数据库

Using a Macroalgal Functional Form Approach to Assess the Level of Disturbance of Seagrass Meadows in Bahía of Nuevitas,Cuba(2000-2002)

在线全文

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2019年第11期10卷 2020-2033页

作者： Rubén Cabrera Jhoana Diaz-Larrea Schery Umanzor Laura Georgina Núnez Garcia gabinete de arqueologia Oficina del Historiador de la CiudadHabana ViejaCuba departamento de Hidrobiologia Universidad Autonoma Metropolitana-IztapalapaMexico CityMexico department of Ecology&Evolutionary Biology University of ConnecticutStamfordCTUSA

A study on the spatial and seasonal variations of the associate macroalgae and epiphytes of Thalassia testudinum was carried out in Bahía de Nuevitas. Sixty-two species were identified: 3 Cyanophyta, 25 Chlorophyta, 8 Phaeophyceae, 23 Rhodophyta and 3 Magnoliophyta, with two new records for Cuba and 43 for the area. The differences in the specific composition of the macroalgae communities are determined by a space component related to the type of affectation in each area. The morpho-functional groups of macroalgae in the station with more nutrient influence were mainly foliaceous and filamentous. In the stations far from the city, the predominant morpho-types were the leathery and articulate calcareous indicators of lower nitrification levels. The abundance and diversity of macroalgae in the site affected by fisheries were lower due to the damage by bottom trawls. Seasonal variations were found in the relative abundance of the species, not in the diversity, which makes evident seasonal changes in the structure of the seaweeds, where some species replace others in the community.

关键词： Cuba Epiphytes Thalassia Morpho-Functional Groups Seaweeds