scholarly journals Dispersal and metapopulation stability

PeerJ ◽  
2015 ◽  
Vol 3 ◽  
pp. e1295 ◽  
Author(s):  
Shaopeng Wang ◽  
Bart Haegeman ◽  
Michel Loreau
Keyword(s):  
Local Community ◽  
Spatial Dynamics ◽  
Metapopulation Dynamics ◽  
Community Stability ◽  
Spatial Synchrony ◽  
Metapopulation Model ◽  
Local Populations ◽  
Spatial Parameters ◽  
Conservation Corridors ◽  
Practical Implications

Metapopulation dynamics are jointly regulated by local and spatial factors. These factors may affect the dynamics of local populations and of the entire metapopulation differently. Previous studies have shown that dispersal can stabilize local populations; however, as dispersal also tends to increase spatial synchrony, its net effect on metapopulation stability has been controversial. Here we present a simple metapopulation model to study how dispersal, in interaction with other spatial and local processes, affects the temporal variability of metapopulations in a stochastic environment. Our results show that in homogeneous metapopulations, the local stabilizing and spatial synchronizing effects of dispersal cancel each other out, such that dispersal has no effect on metapopulation variability. This result is robust to moderate heterogeneities in local and spatial parameters. When local and spatial dynamics exhibit high heterogeneities, however, dispersal can either stabilize or destabilize metapopulation dynamics through various mechanisms. Our findings have important theoretical and practical implications. We show that dispersal functions as a form of spatial intraspecific mutualism in metapopulation dynamics and that its effect on metapopulation stability is opposite to that of interspecific competition on local community stability. Our results also suggest that conservation corridors should be designed with appreciation of spatial heterogeneities in population dynamics in order to maximize metapopulation stability.

Investigating interdependencies of sustainable supplier selection criteria: an appraisal using ISM

2020 ◽  
Vol 13 (2) ◽  
pp. 195-210 ◽  
Author(s):  
Avanish Singh Chauhan ◽  
Gaurav Kumar Badhotiya ◽  
Gunjan Soni ◽  
Prem Kumari
Keyword(s):  
Supplier Selection ◽  
Selection Criteria ◽  
Local Community ◽  
Pollution Prevention ◽  
Content Type ◽  
The Past ◽  
Micmac Analysis ◽  
Sustainable Supplier Selection ◽  
Social Environmental ◽  
Practical Implications

Purpose Because of the increased global competition and the need for environment consciousness, organisations have started focusing on incorporating sustainability dimensions into suppler selection criteria. In the past decade, sustainable supplier selection has received much attention from researchers as well as industry practitioners. The purpose of this paper is to identify various sustainable supplier selection criteria (SSSC) and underlying interdependencies among prominent selection criteria to develop a framework for sustainability dimensions. Design/methodology/approach The sustainable criteria for supplier selection were established through comprehensive literature review. An interpretive structural modelling (ISM) approach is used to investigate the interrelationships among these criteria. Findings A total of 21 SSSC under 3 dimensions (social, environmental and economic) are established. Ten criteria related to quality, capability, flexibility, waste management, pollution prevention, local community, employment practice, labour, etc. are exhibiting strong driving as well as dependence power, as demonstrated through ISM and matriced’ impacts croises-multiplication applique’ and classement (MICMAC) analysis. The findings show that delivery/service, eco design and rights of stakeholders are the “key” criteria having a high-driving and low-dependence power. These criteria require high attention from managers, while other criteria having low-driving and high-dependence power require secondary actions. Research limitations/implications The inter-relations for the development of ISM model and MICMAC analysis were obtained through the opinion of industry experts and academicians, which may tend to be subjectively biased. Further exploration is proposed to statistically validate the developed interdependency model. Practical implications This paper might act as a reference for the supplier development managers of organisations by providing an appraisal of various SSSC based on their interdependencies. Originality/value This study contributes to the knowledge base by proposing a framework of the interrelationships of the SSSC and also provides an additional perspective for managing these criteria based on ISM.

scholarly journals Spatial Information Gaps on Deprived Urban Areas (Slums) in Low-and-Middle-Income-Countries: A User-Centered Approach

Urban Science ◽  
2021 ◽  
Vol 5 (4) ◽  
pp. 72
Author(s):  
Monika Kuffer ◽  
Jon Wang ◽  
Dana R. Thomson ◽  
Stefanos Georganos ◽  
Angela Abascal ◽  
...  
Keyword(s):  
Information System ◽  
Urban Areas ◽  
Online Survey ◽  
Local Community ◽  
Spatial Information ◽  
Spatial Dynamics ◽  
Middle Income ◽  
Urban Deprivation ◽  
Deprived Areas ◽  
User Centered

Routine and accurate data on deprivation are needed for urban planning and decision support at various scales (i.e., from community to international). However, analyzing information requirements of diverse users on urban deprivation, we found that data are often not available or inaccessible. To bridge this data gap, Earth Observation (EO) data can support access to frequently updated spatial information. However, a user-centered approach is urgently required for the production of EO-based mapping products. Combining an online survey and several forms of user interactions, we defined five system specifications (derived from user requirements) for designing an open-access spatial information system for deprived urban areas. First, gridded maps represent the optimal spatial granularity to deal with high uncertainties of boundaries of deprived areas and to protect privacy. Second, a high temporal granularity of 1–2 years is important to respond to the high spatial dynamics of urban areas. Third, detailed local-scale information should be part of a city-to-global information system. Fourth, both aspects, community assets and risks, need to be part of an information system, and such data need to be combined with local community-based information. Fifth, in particular, civil society and government users should have fair access to data that bridges the digital barriers. A data ecosystem on urban deprivation meeting these requirements will be able to support community-level action for improving living conditions in deprived areas, local science-based policymaking, and tracking progress towards global targets such as the SDGs.

How can ecological fairs increase sustainability in a university campus?

2019 ◽  
Vol 20 (3) ◽  
pp. 515-529
Author(s):  
Luciana Londero Brandli ◽  
Amanda Lange Salvia ◽  
Leila Dal Moro ◽  
Vanessa Tibola da Rocha ◽  
Janaina Mazutti ◽  
...  
Keyword(s):  
Local Community ◽  
Social Economic ◽  
University Campus ◽  
Content Type ◽  
University Campuses ◽  
The Social ◽  
Short Period ◽  
The University ◽  
Practical Implications

Purpose This paper aims to highlight the contribution of ecological fairs to the promotion of sustainability in university campuses, based on a case study carried out at the University of Passo Fundo, located in Southern Brazil. Design/methodology/approach Producers and consumers of the ecological fairs were interviewed to analyse how the social, economic and environmental spheres of sustainable development are impacted by these fairs. In total, 24 interviews were conducted. Findings The results showed how fairs positively impact the academic and local community while bringing sustainability into university campuses. Research limitations/implications The main limitations of this study were the number of interviews and the short period during when the study was conducted. Practical implications This case study demonstrated how the promotion of ecological fairs on a university campus plays an important role in the implementation and practice of sustainability and can serve as an example for other institutions that intend to work on similar projects. Originality/value This paper contributes to the literature by providing a discussion on how ecological fairs represent a good addition in the process of universities to become more sustainable and which aspects of each sustainability sphere are involved.

scholarly journals How to find a metapopulationThis review is one of a series dealing with some aspects of the impact of habitat fragmentation on animals and plants. This series is one of several virtual symposia focussing on ecological topics that will be published in the Journal from time to time.

2007 ◽  
Vol 85 (10) ◽  
pp. 1031-1048 ◽  
Author(s):  
D.A. Driscoll
Keyword(s):  
Native Species ◽  
Field Data ◽  
Spatial Dynamics ◽  
Metapopulation Dynamics ◽  
Data Sets ◽  
Fragmented Landscapes ◽  
Metapopulation Theory ◽  
Metapopulation Models ◽  
The Impact ◽  
Analytical Approaches

Where habitat loss and fragmentation is severe, many native species are likely to have reduced levels of dispersal between remnant populations. For those species to avoid regional extinction in fragmented landscapes, they must undergo some kind of metapopulation dynamics so that local extinctions are countered by recolonisation. The importance of spatial dynamics for regional survival means that research into metapopulation dynamics is essential. In this review I explore the approaches taken to examine metapopulation dynamics, highlight the analytical methods used to get the most information out of field data, and discover some of the major research gaps. Statistical models, including Hanski’s incidence function model (IFM) are frequently applied to presence–absence data, an approach that is often strengthened using long-term data sets that document extinctions and colonisations. Recent developments are making the IFM more biologically realistic and expanding the range of situations for which the model is relevant. Although accurate predictions using the IFM seem unlikely, it may be useful for ranking management decisions. A key weakness of presence–absence modelling is that the mechanisms underlying spatial dynamics remain inferential, so combining modelling approaches with detailed demographic research is warranted. For species where very large data sets cannot be obtained to facilitate statistical modelling, a demographic approach alone or with stochastic modelling may be the only viable research angle to take. Dispersal is a central process in metapopulation dynamics. Research combining mark–recapture or telemetry methods with model-selection procedures demonstrate that dispersal is frequently oversimplified in conceptual and statistical metapopulation models. Dispersal models like the island model that underlies classic metapopulation theory do not approximate the behaviour of real species in fragmented landscapes. Nevertheless, it remains uncertain if additional biological realism will improve predictions of statistical metapopulation models. Genetic methods can give better estimates of dispersal than direct methods and take less effort, so they should be routinely explored alongside direct ecological methods. Recent development of metacommunity theory (communities connected by dispersal) emphasises a range of mechanisms that complement metapopulation theory. Taking both theories into account will enhance interpretation of field data. The extent of metapopulation dynamics in human modified landscapes remains uncertain, but we have a powerful array of field and analytical approaches for reducing this knowledge gap. The most informative way forward requires that many species are studied in the same fragmented landscape by applying a selection of approaches that reveal complementary aspects of spatial dynamics.

scholarly journals Habitat choice stabilizes metapopulation dynamics through increased ecological specialisation

2018 ◽  
Author(s):  
Frederik Mortier ◽  
Staffan Jacob ◽  
Martijn L. Vandegehuchte ◽  
Dries Bonte
Keyword(s):  
Population Dynamics ◽  
Habitat Choice ◽  
Current Theory ◽  
Metapopulation Dynamics ◽  
Evolution Of Dispersal ◽  
Tight Coupling ◽  
Dispersal Capacity ◽  
Local Populations ◽  
Informed Decisions ◽  
The Face

AbstractDispersal is a key trait responsible for the spread of individuals and genes among local populations, thereby generating eco-evolutionary interactions. Especially in heterogeneous metapopulations, a tight coupling between dispersal, population dynamics and the evolution of local adaptation is expected. In this respect, current theory predicts dispersal to counteract ecological specialisation by redistributing locally selected phenotypes (i.e. migration load). However, in nature we observe that some specialists exhibit a strong dispersal capacity.Habitat choice following informed dispersal decisions, provides a possible mechanism for individuals to match the environment to their phenotype, thereby enabling the persistence of evolved ecological specialisation. How such informed decisions affect the evolution of dispersal and ecological specialisation and how these, in turn, influence metapopulation dynamics is yet to be determined.By means of individual-based modelling, we show that informed decisions on both departure and settlement decouples the evolution of dispersal and generalism, favouring highly dispersive specialists. Choice at settlement decouples dispersal from ecological specialisation most effectively. Additionally, habitat choice stabilizes local and metapopulation demography because of the maintenance of ecological specialisation at all levels of dispersal propensity.We advocate considering habitat choice in spatially structured ecological models to improve demographic predictions in the face of environmental change.

scholarly journals How local communities attribute livelihood vulnerabilities to climate change and other causes: a case study in North Vanuatu

2021 ◽  
Vol 168 (3-4) ◽  
Author(s):  
Danny Philipp Nef ◽  
Daniel Neneth ◽  
Patteson Dini ◽  
Carmenza Robledo Abad ◽  
Pius Kruetli
Keyword(s):  
Climate Change ◽  
Local Community ◽  
Participant Observation ◽  
Community Members ◽  
Causal Factors ◽  
Local Populations ◽  
Local Agriculture ◽  
Study Process ◽  
External Causes

AbstractUnderstanding the causal factors of livelihood challenges and associated vulnerabilities is essential for developing viable adaptation strategies. However, clarifying which livelihood challenges can be attributed to which causal factors remains a challenge. In this paper, we used a case study in Vanuatu to show how local populations attribute subsistence challenges to underlying causes. Particularly, we are interested in whether there is a tendency to view climate change as the primary cause, and if so, why. We followed a participatory approach involving local community members and experts at all stages of the study process. For this, we used complementary research methods such as resource mapping, participant observation, and in-depth interviews with local community members and local agriculture experts. The results show that local populations are indeed inclined to attribute problems to external causes, particularly climate change. However, the results also indicate that this external attribution is not definitive. Rather, we find that over the course of participatory reflection, attribution to climate change was supplemented and even replaced by internal causal factors, such as changes in garden practices. Our findings suggest that the initial emphasis on climate change may be related to prevailing narratives that may have influenced individual perceptions of the study participants and created social desirability. If such bias is not recognized, the narratives risk being reified, with potential new insights being overlooked. As a result, local attribution may overstate or understate specific causes, such as climate change.

scholarly journals From breaking-ice to breaking-out: integration as an opportunity creation process

2019 ◽  
Vol 25 (5) ◽  
pp. 880-899
Author(s):  
Quang Evansluong ◽  
Marcela Ramirez Pasillas ◽  
Huong Nguyen Bergström
Keyword(s):  
Sense Of Belonging ◽  
Design Methodology ◽  
Local Community ◽  
Host Society ◽  
Content Type ◽  
Creation Process ◽  
Socially Excluded ◽  
Practical Implications ◽  
Opportunity Creation

Purpose The purpose of this paper is to conduct an inductive case study to understand how the opportunity creation process leads to integration. Design/methodology/approach It examines four cases of immigrant entrepreneurs of Cameroonian, Lebanese, Mexican and Assyrian origins who founded their businesses in Sweden. The study relies on process-oriented theory building and develops an inductive model of integration as an opportunity creation process. Findings The suggested model shows immigrants’ acculturation into the host society via three successive phases: breaking-ice, breaking-in and breaking-out. In the breaking-ice phase, immigrants trigger entrepreneurial ideas to overcome the disadvantages that they face as immigrants in the host country. In the breaking-in phase, immigrants articulate their entrepreneurial ideas by bonding with the ethnic community. In the breaking-out phase, the immigrants reorient their entrepreneurial ideas by desegregating them locally. The paper concludes by elaborating theoretical and practical implications of the research. Originality/value Immigrants act when they are socially excluded and discriminated in the labor market by developing business ideas and becoming entrepreneurs. By practicing the new language and accommodating native customers’ preferences, immigrants reorient their entrepreneurial ideas. The immigrants tailor their ideas to suit their new customers by strengthening their sense of belonging to the local community.

Regional and local effects drive changes in spawning stream occupancy in a sockeye salmon metapopulation

2021 ◽  
Author(s):  
Michael J Bradford ◽  
Douglas C. Braun
Keyword(s):  
Sockeye Salmon ◽  
Spatial Dynamics ◽  
Population Diversity ◽  
Structured Populations ◽  
Conservation Strategies ◽  
Metapopulation Dynamics ◽  
Habitat Conditions ◽  
Local Effects ◽  
The Core ◽  
Spatially Structured Populations

There is a need to explicitly consider metapopulation dynamics in the development of conservation strategies for spatially-structured populations. We examined the spatial dynamics of sockeye salmon (Oncorhynchus nerka) that spawn in 36 streams of the Stuart River watershed in British Columbia, Canada, using a 69-year record of spawner abundance and a demographically-based Bayesian dynamic occupancy model. We identified a set of 12 streams with good habitat conditions that were occupied >90% of years despite large year-to-year changes in abundance. Over 85% of spawners were concentrated in these streams. Many other streams with poorer habitat had small populations that were not persistent over time and were periodically recolonized by dispersers from other streams. Although it is often assumed population diversity and resiliency is maximized when all available habitats are used, for this salmon metapopulation, resiliency is due to the core streams of higher habitat quality. Currently other streams make only small contributions to population abundance, however, some may have conservation value if their habitats become more suitable for spawning in the future.

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