scholarly journals Integrating dispersal proxies in ecological and environmental research in the freshwater realm

2017 ◽  
Vol 25 (3) ◽  
pp. 334-349 ◽  
Author(s):  
Jani Heino ◽  
Janne Alahuhta ◽  
Terhi Ala-Hulkko ◽  
Harri Antikainen ◽  
Luis Mauricio Bini ◽  
...  
Keyword(s):  
Environmental Conditions ◽  
Restoration Ecology ◽  
Spatial Dynamics ◽  
Single Species ◽  
Environmental Research ◽  
Freshwater Systems ◽  
Biological Communities ◽  
Research Fields ◽  
Basic And Applied Research ◽  
Applied Fields

Dispersal is one of the key mechanisms affecting the distribution of individuals, populations, and communities in nature. Despite advances in the study of single species, it has been notoriously difficult to account for dispersal in multispecies metacommunities, where it potentially has strong effects on community structure beyond those of local environmental conditions. Dispersal should thus be directly integrated in both basic and applied research by using proxies. Here, we review the use of proxies in the current metacommunity research, suggest new proxies, and discuss how proxies could be used in community modelling, particularly in freshwater systems. We suggest that while traditional proxies may still be useful, proxies formerly utilized in transport geography may provide useful novel insights into the structuring of biological communities in freshwater systems. We also suggest that understanding the utility of such proxies for dispersal in metacommunities is highly important for many applied fields such as freshwater bioassessment, conservation planning, and recolonization research in the context of restoration ecology. These research fields have often ignored spatial dynamics and focused mostly on local environmental conditions and changes therein. Yet, the conclusions of these applied studies may change considerably if dispersal is taken into account.

REPRESENTAÇÃO MULTIESCALAR DO AMBIENTE GEOMORFOLÓGICO DA PRAIA DAS FONTES – CEARÁ

2019 ◽  
Vol 21 (2) ◽  
pp. 1217-1233
Author(s):  
Filipe Maciel De Moura ◽  
Antônio Rodrigues Ximenes Neto ◽  
Adryane Gorayeb ◽  
Davis Pereira De Paula ◽  
Fábio Perdigão Vasconcelos
Keyword(s):  
Coastal Plain ◽  
Environmental Conditions ◽  
Spatial Dynamics ◽  
Point Of View ◽  
Coastal Geomorphology ◽  
Multi Scale ◽  
Morphological System

A planície costeira brasileira, em especial a do Nordeste do Brasil, apresenta um sistema morfológico que sofre diversas pressões do ponto de vista do uso e ocupação dos seus espaços. Logo, o entendimento da dinâmica natural e espacial desse ambiente requer a adoção de metodologias que contemplem uma abordagem em múltiplas escalas. Neste sentido, este trabalho tem o intuito de analisar as múltiplas morfologias associadas a praia das Fontes, em Beberibe-CE, em diferentes escalas taxonômicas. Esta análise auxiliou na realização de um prognostico das condições ambientais e de sua capacidade de suporte. Metodologicamente aplicou-se a proposta de Bertrand (1971), adotando-se apenas as unidades inferiores que inclui os níveis taxonômicos regionais e/ou locais, compreendendo os geossistemas, geofáciese os geótopos. Os resultados alcançados foram satisfatórios, uma vez que as unidades mapeadas foram validadas em atividades de campo para reconhecimento do produto cartográfico.Palavras-chave: Análise Multiescalar. Geomorfologia Costeira. Formação Barreiras. ABSTRACTThe Brazilian coastal plain, especially in the Northeast of Brazil, presents a morphological system that undergoes several pressures from the point of view of the use and occupation of its spaces. Therefore, the understanding of the natural and spatial dynamics of this environment requires the adoption of methodologies that contemplate a multi-scale approach. In this sense, this work has the purpose of analyzing the multiple morphologies associated to Praia das Fontes, in Beberibe-CE, at different taxonomic scales. This analysis assisted in the accomplishment of a prognosis of the environmental conditions and their support capacity. Methodologically Bertrand's (1972) proposal was applied, adopting only the lower units that includes regional and / or local taxonomic levels, including geosystems, geophysics and geo-objects. The results were satisfactory, since the mapped units were validated in field activities to recognize the cartographic product.Keywords: Multiscalar Analysis. Coastal Geomorphology. Training Barriers. RESUMENLa llanura costera brasileña, especialmente en el noreste de Brasil, tiene un sistema morfológico que sufre varias presiones desde el punto de vista del uso y la ocupación de sus espacios. Por lo tanto, comprender la dinámica natural y espacial de este entorno requiere la adopción de metodologías que incluyan un enfoque de múltiples escalas. En este sentido, este trabajo tiene como objetivo analizar las múltiples morfologías asociadas a la playa de Fontes, en Beberibe-CE, en diferentes escalas taxonómicas. Este análisis ayudó a hacer una predicción de las condiciones ambientales y su capacidad de carga. Metodológicamente, se aplicó la propuesta de Bertrand (1971), adoptando solo las unidades inferiores, que incluyen niveles taxonómicos regionales y / o locales, incluidos los geosistemas, geofacies y geotopos. Los resultados obtenidos fueron satisfactorios, ya que las unidades mapeadas fueron validadas en actividades de campo para el reconocimiento de productos cartográficos.Palabras clave: Análisis multiescala. Geomorfología costera. Barreras de entrenamiento.

Spatial dynamics of a nonlocal delayed unstirred chemostat model with periodic input

2019 ◽  
Vol 12 (06) ◽  
pp. 1950065
Author(s):  
Wu-Jun Pu ◽  
Danhua Jiang ◽  
Ya Wang ◽  
Zhanbing Bai
Keyword(s):  
Existence And Uniqueness ◽  
Spatial Dynamics ◽  
Single Species ◽  
Uniqueness Of Solution ◽  
Uniform Persistence ◽  
Global Dynamics ◽  
Chemostat Model ◽  
Periodic Input

In this paper, a nonlocal delayed chemostat model of a single species feeding on a periodically varying input nutrient is proposed. By the theory of semigroup, the existence and uniqueness of solution of the system are obtained. Furthermore, we investigate a threshold result on the global dynamics, and the uniform persistence of the system is established.

scholarly journals Chemical-physical and ecological characterisation in the environmental project of a polluted coastal area: the Bagnoli case study

2003 ◽  
Vol 4 (2) ◽  
pp. 5 ◽  
Author(s):  
I. BERGAMIN ◽  
E. ROMANO ◽  
M. GABELLINI ◽  
A. AUSILI ◽  
M.G. CARBONI
Keyword(s):  
Statistical Approach ◽  
Anthropogenic Pollution ◽  
Single Species ◽  
Environmental Research ◽  
Industrial Plant ◽  
Tyrrhenian Sea ◽  
Good Tolerance ◽  
Composition And Structure ◽  
Southern Tyrrhenian Sea

The Bagnoli Bay (southern Tyrrhenian Sea, Naples, Italy) has been impacted for about one century by heavy anthropogenic pollution due to an important steel plant. A multidisciplinary environmental research, aimed at the reclamation of the marine contaminated area, was planned in order to evaluate, through quantitative data, the chemical-physical and ecological characteristics of marine sediments; the latter ones are strictly related to the composition and structure of benthic foraminiferal assemblages. A comprehensive statistical approach, considering all data, was attempted in order to single out the influence of pollutants on the single species distribution. The results show strong heavy metal pollution (Fe, Mn, Pb and Zn) in the vicinity of the industrial plant. Many foraminiferal species (Haynesina germanica, Miliolinella subrotunda,Quinqueloculina parvula), have a good tolerance to some trace metals while, Bulimina sublimbata, Elphidiummacellum and Miliolinella dilatata show a good tolerance to PAHs pollution.

scholarly journals Can Big Data Analysis Make Cities Smarter? Emerging Issues and Stakeholder Implications in Smart Mobility

2017 ◽  
Vol 8 (1) ◽  
pp. 23 ◽  
Author(s):  
Asst. Prof. Dr. Serkan Gürsoy ◽  
Asst. Prof. Dr. Murat Yücelen
Keyword(s):  
Big Data ◽  
Data Analysis ◽  
Smart Cities ◽  
Academic Research ◽  
Big Data Analysis ◽  
Ongoing Debate ◽  
Research Fields ◽  
Emerging Issues ◽  
Smart Mobility ◽  
Applied Fields

This study deals with the challenges and bottlenecks with respect to the concept of smart cities which has largely been constructed on knowledge utilization issues and challenges. Despite the abundant existent literature in this field, the effective transformation of data into knowledge which can become a source of competitive advantage is still an ongoing debate, especially due to contemporary developments in big data analysis methods, approaches and strategies. As an emerging problem, the derivation of significant meaning from big data is among popular academic research fields, as well as being a crucial industrial and policy making engagement regarding value creating mechanisms in smart cities. Therefore in this study, limitations and challenges in translating big data into valuable knowledge in academia and industries are considered within the concept of smart mobility. In an attempt to propose researchers, business firms and governmental entities a collaborative approach, a perception about emerging issues is presented for clarifying some future constructs intersecting in relevant research and applied fields.

scholarly journals How Different are Population Movements between Weekdays and Weekends: A Complex-Network-Based Analysis on 36 Major Chinese Cities

Land ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 1160
Author(s):  
Chengyue Zhang ◽  
Minmin Li ◽  
Ding Ma ◽  
Renzhong Guo
Keyword(s):  
Complex Network ◽  
Regional Integration ◽  
Rapid Development ◽  
Spatial Dynamics ◽  
Information And Communications Technology ◽  
Floating Population ◽  
Population Mobility ◽  
Research Fields ◽  
Dynamic Perspective ◽  
Temporal And Spatial

With the rapid development of Information and Communications Technology (ICT) and transportation infrastructure, the flows of people between cities have become the cornerstone of shaping regional integration. Although research studies about the movement of people have aroused widespread interest in academia, research about the temporal and spatial dynamics of daily mobility between cities is sparse, which is called the temporal heterogeneity of mobility between cities. This research aims to study the temporal and spatial changes (Heterogeneity) of population mobility between cities, using big data obtained through China Unicom, in terms of mapping the spatial network of population mobility and complex network analysis, from which the following findings emerge: (1) On weekends, the gap between cities in the number of floating population flow and the capacity of transferring population has become smaller, indicating that there is better coordination between cities on weekends. (2) There are huge differences in population flow between cities, which reflects the imbalance of urban development, population is more concentrated in cities with higher level of development. (3) The heterogeneity of population flow between cities at weekdays and weekends is closely related to the city’s hierarchy, which can help us study the hierarchical structure of China’s cities from a dynamic perspective. The paper emphasizes the importance of researching heterogeneity issues, clarifies the difference between the heterogeneity of weekdays and weekends and the heterogeneity involved in previous population research fields in terms of population flow and deficiencies in research.

scholarly journals Influence of European Beech (Fagales: Fagaceae) Rot Hole Habitat Characteristics on Invertebrate Community Structure and Diversity

2021 ◽  
Vol 21 (5) ◽  
Author(s):  
Jordan P Cuff ◽  
Fredric M Windsor ◽  
Emma C Gilmartin ◽  
Lynne Boddy ◽  
T Hefin Jones
Keyword(s):  
Community Structure ◽  
Environmental Conditions ◽  
European Beech ◽  
Habitat Characteristics ◽  
Invertebrate Communities ◽  
Biological Communities ◽  
Β Diversity ◽  
Invertebrate Diversity ◽  
Veteran Trees ◽  
Hole Dimensions

Abstract Hollows of veteran trees (i.e., rot holes) provide habitat for many rare and threatened saproxylic invertebrates. Rot holes are highly heterogeneous, particularly in terms of substrate and microclimate conditions. There is, however, a dearth of information regarding the differences in biological communities inhabiting rot holes with different environmental conditions. Invertebrates were sampled from European beech (Fagus sylvatica) rot holes in Windsor, Savernake, and Epping Forests (United Kingdom). For each rot hole, physical and environmental conditions were measured, including tree diameter, rot hole dimensions, rot hole height, substrate density, water content, and water potential. These parameters were used to assess the influence of environmental conditions and habitat characteristics on invertebrate communities. Rot hole invertebrate communities were extremely diverse, containing both woodland generalist and saproxylic specialist taxa. Large variation in community structure was observed between rot holes and across woodlands; all sites supported threatened and endangered taxa. Environmental conditions in rot holes were highly variable within and between woodland sites, and communities were predominantly structured by these environmental conditions. In particular, turnover between invertebrate communities was linked to high β-diversity. The linked heterogeneity of environmental conditions and invertebrate communities in rot holes suggests that management of deadwood habitats in woodlands should strive to generate environmental heterogeneity to promote invertebrate diversity. Additional research is required to define how management and conservation activities can further promote enhanced biodiversity across rot holes.

scholarly journals Diatoms in an extreme euxinic environment (Rogoznica Lake, eastern Adriatic coast)

2015 ◽  
Vol 74 (2) ◽  
pp. 333-343 ◽  
Author(s):  
Nikola Malešević ◽  
Irena Ciglenečki ◽  
Elvira Bura-Nakić ◽  
Marina Carić ◽  
Iris Dupčić ◽  
...  
Keyword(s):  
Environmental Conditions ◽  
Species Abundance ◽  
Temporal Distribution ◽  
Single Species ◽  
Diatom Species ◽  
Chaetoceros Curvisetus ◽  
Cyclotella Choctawhatcheeana ◽  
Marine System ◽  
Adriatic Coast ◽  
Sample Maximum

AbstractThe Rogoznica Lake marine system is a small, karstic, naturally eutrophic and euxinic marine environment. Abundance and temporal distribution of phytoplankton was investigated in relation to environmental conditions in the period from 1998 to 2013. The 36 determined diatoms contributed 90% of the total phytoplankton abundance. The diatom composition is characterized by low species diversity and high single species abundance (up to 107 cells L-1). There were, on average, 2.6 diatom species per sample (maximum 14 diatom species per sample) reflecting extreme environmental conditions. Dominant diatoms Thalassionema nitzschioides, Cyclotella choctawhatcheeana, Dactyliosolen fragilissimus and Chaetoceros curvisetus occurred repeatedly and were alternately dominant in the lake during the whole research period. Some diatoms were dominant only in limited period, like Cyclotella choctawhatcheeana (evident since 2001), and Pseudo-nitzschia spp. (evident in the period 2002 to 2009). It appears that the interplay of environmental conditions such as variability in thermohaline and redox conditions, nutrient and reduced sulphur concentration influence the phytoplankton development and abundance in the lake.

scholarly journals Automated analysis of genomic sequences facilitates high-throughput and comprehensive description of bacteria

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Thomas C. A. Hitch ◽  
Thomas Riedel ◽  
Aharon Oren ◽  
Jörg Overmann ◽  
Trevor D. Lawley ◽  
...  
Keyword(s):  
Large Fraction ◽  
Single Species ◽  
Automated Analysis ◽  
Automatic Generation ◽  
Rrna Gene ◽  
Ecological Analysis ◽  
Research Fields ◽  
Novel Taxa ◽  
Functional Features ◽  
Novel Bacteria

AbstractThe study of microbial communities is hampered by the large fraction of still unknown bacteria. However, many of these species have been isolated, yet lack a validly published name or description. The validation of names for novel bacteria requires that the uniqueness of those taxa is demonstrated and their properties are described. The accepted format for this is the protologue, which can be time-consuming to create. Hence, many research fields in microbiology and biotechnology will greatly benefit from new approaches that reduce the workload and harmonise the generation of protologues.We have developed Protologger, a bioinformatic tool that automatically generates all the necessary readouts for writing a detailed protologue. By producing multiple taxonomic outputs, functional features and ecological analysis using the 16S rRNA gene and genome sequences from a single species, the time needed to gather the information for describing novel taxa is substantially reduced. The usefulness of Protologger was demonstrated by using three published isolate collections to describe 34 novel taxa, encompassing 17 novel species and 17 novel genera, including the automatic generation of ecologically and functionally relevant names. We also highlight the need to utilise multiple taxonomic delineation methods, as while inconsistencies between each method occur, a combined approach provides robust placement. Protologger is open source; all scripts and datasets are available, along with a webserver at www.protologger.de

Integrating Climate Change Consideration into Strategic Environmental Assessment within the Context of China

2014 ◽  
Vol 955-959 ◽  
pp. 1657-1660 ◽  
Author(s):  
Bao Le Deng ◽  
Hui Zhi Wang
Keyword(s):  
Climate Change ◽  
Environmental Assessment ◽  
Transportation Planning ◽  
Indicator System ◽  
Strategic Environmental Assessment ◽  
Environmental Research ◽  
The Third ◽  
Research Fields

Climate change has been highlighted as an apparent and urgent issue in environmental research fields. Transport, as the third carbon emitter sector in China, is partly responsible for climate change. It is necessary to modify the existing Strategic Environmental Assessment (SEA) system for transportation planning so as to cope with the challenges of Climate Change. In this paper, we tried to integrate climate change consideration into SEA process, and proposed the framework and indicator system for SEA considering climate change.

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