scholarly journals Impacts of the alien mosquitofish on the abundance and condition of two Mediterranean native fish

2019 ◽  
Vol 20 (4) ◽  
pp. 727 ◽  
Author(s):  
ELENI KALOGIANNI ◽  
NICHOLAS KOUTSIKOS ◽  
LEONIDAS VARDAKAS ◽  
SOFIA GIAKOUMI ◽  
YORGOS CHATZINIKOLAOU ◽  
...  
Keyword(s):  
Resource Competition ◽  
Habitat Degradation ◽  
Freshwater Ecosystems ◽  
Rapid Decline ◽  
Somatic Condition ◽  
Conservation Implications ◽  
Negative Impacts ◽  
Using Data ◽  
Eastern Mosquitofish ◽  
Of Greece

The rapid decline of the Greek native Valencia letourneuxi, and its recently described sister species Valencia robertae, has been often attributed to habitat degradation, as well as aggression from or resource competition with the alien mosquitofish Gambusia holbrooki. The mosquitofish is extremely wide-spread in Mediterranean freshwater ecosystems, however, documentation on its presumed negative impacts on native freshwater fishes is limited. In this study, we compared abundance, condition and gonad weight of Valencia spp. in no co-occurrence versus co-occurrence to the mosquitofish, using data collected from eight aquatic systems of Greece, over a five year period (2005 to 2009). Our results show that Valencia abundance is significantly lower in co-occurrence to the Eastern mosquitofish. Furthermore, female Valencia spp. individuals in co-occurrence to the mosquitofish were smaller in length and had poorer somatic condition compared to females in habitats not invaded by the mosquitofish. The mechanisms responsible for these effects of the alien mosquitofish as well as the conservation implications for native Valencia populations are discussed.

Migrant and non-migrant fertility in Greece: Results based on the 2001 population census

2014 ◽  
Vol 4 (2) ◽  
pp. 147-158 ◽  
Author(s):  
Georgia Verropoulou ◽  
Christos Bagavos ◽  
Cleon Tsimbos
Keyword(s):  
Ethnic Groups ◽  
Population Census ◽  
Migrant Women ◽  
Native Women ◽  
Children Ever Born ◽  
Using Data ◽  
Of Greece ◽  
Migrant Fertility

This paper examines fertility patterns and differentials between migrant and non-migrant women in Greece using data from the 2001 census on the reported numbers of children ever-born alive by citizenship. Special tabulations produced by the National Statistical Service of Greece are analysed and presented here. The analysis focuses on Greek, Albanian and Bulgarian women born over 1950-1970. Noticeable differences are observed. Despite the fact that Bulgarian women tend to have their first births earlier, their fertility levels are the lowest. Albanian women exhibit the highest fertility while levels for native women are somewhere in between. Nevertheless, the gap observed among the ethnic groups tends, broadly, to narrow over successive cohorts.  

scholarly journals Asymmetric competition causes multimodal size distributions in spatially structured populations

2016 ◽  
Vol 283 (1823) ◽  
pp. 20152404 ◽  
Author(s):  
Jorge Velázquez ◽  
Robert B. Allen ◽  
David A. Coomes ◽  
Markus P. Eichhorn
Keyword(s):  
Resource Competition ◽  
Structured Populations ◽  
Necessary Condition ◽  
Small Scale ◽  
Asymmetric Competition ◽  
Size Distributions ◽  
Long Term Study ◽  
Multimodal Distributions ◽  
Using Data

Plant sizes within populations often exhibit multimodal distributions, even when all individuals are the same age and have experienced identical conditions. To establish the causes of this, we created an individual-based model simulating the growth of trees in a spatially explicit framework, which was parametrized using data from a long-term study of forest stands in New Zealand. First, we demonstrate that asymmetric resource competition is a necessary condition for the formation of multimodal size distributions within cohorts. By contrast, the legacy of small-scale clustering during recruitment is transient and quickly overwhelmed by density-dependent mortality. Complex multi-layered size distributions are generated when established individuals are restricted in the spatial domain within which they can capture resources. The number of modes reveals the effective number of direct competitors, while the separation and spread of modes are influenced by distances among established individuals. Asymmetric competition within local neighbourhoods can therefore generate a range of complex size distributions within even-aged cohorts.

scholarly journals Regulations are needed to protect freshwater ecosystems from salinization

2018 ◽  
Vol 374 (1764) ◽  
pp. 20180019 ◽  
Author(s):  
Matthew S. Schuler ◽  
Miguel Cañedo-Argüelles ◽  
William D. Hintz ◽  
Brenda Dyack ◽  
Sebastian Birk ◽  
...  
Keyword(s):  
Anthropogenic Activities ◽  
Freshwater Ecosystems ◽  
Industrial Wastes ◽  
Anthropogenic Source ◽  
Economic Costs ◽  
Regulatory Standards ◽  
Management Procedures ◽  
Using Data ◽  
Multi Stakeholder ◽  
Freshwater Salinization

Anthropogenic activities such as mining, agriculture and industrial wastes have increased the rate of salinization of freshwater ecosystems around the world. Despite the known and probable consequences of freshwater salinization, few consequential regulatory standards and management procedures exist. Current regulations are generally inadequate because they are regionally inconsistent, lack legal consequences and have few ion-specific standards. The lack of ion-specific standards is problematic, because each anthropogenic source of freshwater salinization is associated with a distinct set of ions that can present unique social and economic costs. Additionally, the environmental and toxicological consequences of freshwater salinization are often dependent on the occurrence, concentration and ratios of specific ions. Therefore, to protect fresh waters from continued salinization, discrete, ion-specific management and regulatory strategies should be considered for each source of freshwater salinization, using data from standardized, ion-specific monitoring practices. To develop comprehensive monitoring, regulatory, and management guidelines, we recommend the use of co-adaptive, multi-stakeholder approaches that balance environmental, social, and economic costs and benefits associated with freshwater salinization. This article is part of the theme issue ‘Salt in freshwaters: causes, ecological consequences and future prospects’.

scholarly journals Coping with emotion in New Zealand Business schools

2021 ◽  
Author(s):  
◽  
Alice Scahill
Keyword(s):  
New Zealand ◽  
Coping Strategies ◽  
Business Schools ◽  
Tertiary Education ◽  
Early Career ◽  
Specific Level ◽  
Systemic Factors ◽  
Emotional Demands ◽  
Negative Impacts ◽  
Using Data

<p>Emotion is an integral aspect of organisational life and this thesis examines the emotional demands that academics experience in their workplace and the consequences this has for them. At a more specific level, the thesis examines the strategies that academics use to cope with these emotional demands, and how these strategies develop and change over the duration of their career. Using data collected from interviews with academics from business schools across the New Zealand tertiary education sector, findings are presented which demonstrate how academics develop coping strategies and how the organisation provides support. The implications from these findings could have significant effects for organisational practice. Firstly, these findings illustrate that academics experiences emotion in relation to personal, interpersonal, and systemic factors. Secondly, academics adopt a wide array of coping strategies, which have been personally developed by each individual over time. They are not given any organisational training or support for their development of these strategies. In addition, academics use coping strategies both in the workplace and at home in order to attempt to mitigate the negative impacts of the emotional demands of their roles. Finally, academics in their early career lack adequate coping strategies, and appear to have the lowest levels of organisational commitment.</p>

scholarly journals PERSEPSI MASYARAKAT TERHADAP PENGEMBANGAN EKOWISATA BUKIT SITETEPAN (Studi Kasus Desa Tegalsari, Kecamatan Bruno, Kabupaten Purworejo)

2020 ◽  
Vol 43 (1) ◽  
pp. 43
Author(s):  
Delima Canda Mustika ◽  
Eny Lestari ◽  
Sugihardjo Sugihardjo
Keyword(s):  
Public Perception ◽  
Local Community ◽  
Negative Impact ◽  
Positive Impact ◽  
Sampling Technique ◽  
Snowball Sampling ◽  
Planning Stage ◽  
The Government ◽  
Negative Impacts ◽  
Using Data

<p>The Tegalsari village is the large village with the second largest population in Bruno District, Purworejo Regency. It makes Tegalsari village have several potentiality to become ecotourism place. The government wants to develop ecotourism in Tegalsari Village to boost the economy and the welfare condition that categorized as poor village. The first stage of ecotourism development is planning stage to know the public perception of the development of ecotourism in Tegalsari Village.This research aims to examine public perceptions of the development plan of Tegalsari Village ecotourism, Bruno District, Purworejo Regency. This research uses qualitative basic methods with interactive inductive data analysis methods. The research location was chosen intentionally or purposively. Determination of informants in this study using the snowball sampling technique. The number of informants is 14 informants. The validity of the data is obtained using data triangulation. The results of this study indicate that the community provides a positive perception of ecotourism development. Ecotourism development was initiated and welcomed by the local community. The community hopes that Bukit Sitetepan ecotourism development can improve people’s welfare. There are several supporting factors and obstacles to the process of developing ecotourism and ecotourism development also bring positive and negative impacts. According to the community, the positive impact caused is greater than the negative impact.</p>

scholarly journals Greece in the Eurozone: An Evaluation of the First Two Decades

2022 ◽  
Vol 8 (2) ◽  
pp. 177-192
Author(s):  
Gregory T. Papanikos
Keyword(s):  
Economic Performance ◽  
The Political ◽  
Recent Issue ◽  
Political Issue ◽  
Per Capita Gdp ◽  
Political Events ◽  
Per Capita ◽  
Using Data ◽  
Detrimental Impact ◽  
Of Greece

On the 31st of December 2021, the euro celebrated its two decades in circulation. Initially, twelve countries adopted the euro as their new national currency, Greece being one of them. Starting in 2020, euro is the official currency of nineteen European Union countries. This paper aims to examine three issues. Firstly, the paper investigates Greek people’s perception about the euro, using data from the recent issue of the Eurobarometer (December 2021). Secondly, the economic performance of Greece is briefly examined by comparing the Greek Gross Domestic Product (GDP) two decades before and two decades after the introduction of euro. Finally, the Greek participation to the eurozone has been a controversial, political issue. The political developments in Greece during the first two decades of the euro are also studied, emphasizing the dramatic political events after the double elections of 2012. The period of the two decades ends with the detrimental impact of COVID-19. This issue is also mentioned by reviewing some recent publications. Keywords: Eurozone, Greece, GDP, per capita GDP, Eurobarometer, euro, elections, politics

The Production of Cereals in Greece

2017 ◽  
pp. 380-390
Author(s):  
Stilianos Alexiadis ◽  
Stilianos Kokkidis ◽  
Maria Markou
Keyword(s):  
Economic Development ◽  
Agricultural Production ◽  
Important Implication ◽  
Agricultural Sector ◽  
Regional Economic Development ◽  
Growth Characteristics ◽  
Important Conclusion ◽  
Regional Economic ◽  
Using Data ◽  
Of Greece

Although there have been numerous studies examining the process of regional economic development using the Shift-Share analysis, the agricultural sector has received far less attention. One important implication of this methodology is the possibility to detect groups of regions with certain growth characteristics. This paper contributes to the literature by applying the technique of Shift-Share over the period 2000-2015 using data for the production of cereals across the 13 regions of Greece. One important conclusion to emerge is that, in the case of Greek regions, applying the taxonomic procedure of Shift-Share analysis, it is possible to identify the necessary policies for the improvement of agricultural production in each region.

scholarly journals Using Data Mining in Educational Administration: A Case Study on Improving School Attendance

2020 ◽  
Vol 10 (9) ◽  
pp. 3116 ◽  
Author(s):  
Raymond Moodley ◽  
Francisco Chiclana ◽  
Jenny Carter ◽  
Fabio Caraffini
Keyword(s):  
School Leadership ◽  
Educational Administration ◽  
School Attendance ◽  
Novel Approach ◽  
Negative Impacts ◽  
Using Data ◽  
The Uk ◽  
Leadership Research ◽  
Future Work

Pupil absenteeism remains a significant problem for schools across the globe with negative impacts on overall pupil performance being well-documented. Whilst all schools continue to emphasize good attendance, some schools still find it difficult to reach the required average attendance, which in the UK is 96%. A novel approach is proposed to help schools improve attendance that leverages the market target model, which is built on association rule mining and probability theory, to target sessions that are most impactful to overall poor attendance. Tests conducted at Willen Primary School, in Milton Keynes, UK, showed that significant improvements can be made to overall attendance, attendance in the target session, and persistent (chronic) absenteeism, through the use of this approach. The paper concludes by discussing school leadership, research implications, and highlights future work which includes the development of a software program that can be rolled-out to other schools.

An annotated checklist of the Niphargidae (Crustacea: Amphipoda) of Greece

Zootaxa ◽  
2020 ◽  
Vol 4772 (3) ◽  
pp. 517-544
Author(s):  
ALEXANDROS NTAKIS ◽  
IOANNIS KARAOUZAS ◽  
CENE FIŠER ◽  
FABIO STOCH
Keyword(s):  
Endemic Species ◽  
Habitat Degradation ◽  
Point Of View ◽  
High Rate ◽  
Species List ◽  
Red Lists ◽  
Annotated List ◽  
Total Species Richness ◽  
The Republic ◽  
Of Greece

Despite Greece being a global hotspot of subterranean biodiversity, its hypogean fauna is largely neglected from both an ecological and conservational point of view. An overview of the Niphargidae occurring in Greece is presented as an annotated list of all available published records. These records have resulted in an updated species list reflecting taxonomic corrections and species distribution range in the Greek peninsula. A total of 23 species, attributed to 3 genera, is up to date known from Greece with a high rate of endemicity found particularly in Crete. The endemic species of Greece amount to 21 (91% of total species richness), with the remaining species distributing also in the Republic of North Macedonia. Currently, none of them is listed in the national, European or global IUCN Red Lists of Threatened Species. Considering the increasing habitat degradation due to anthropic pressure, groundwater harvesting and climate change we could lose rare and endemic species without even acknowledging their existence. 

scholarly journals Tourism and conservation in Madagascar: The importance of Andasibe National Park

Koedoe ◽  
2014 ◽  
Vol 56 (2) ◽  
Author(s):  
David Newsome ◽  
Shannon Hassell
Keyword(s):  
National Park ◽  
Effective Means ◽  
Local Communities ◽  
Conservation Priority ◽  
Political Climate ◽  
International Organisations ◽  
Natural Area ◽  
Simple Task ◽  
Conservation Implications ◽  
Negative Impacts

Madagascar is renowned for high levels of biodiversity and endemism. As a result of its unique flora and fauna, as well as the high levels of human threat to the environment, such as illegal clearing, hunting and political instability, it is a critical global conservation priority. Andasibe–Mantadia National Park in eastern Madagascar is one of the most popular protected areas visited by tourists. Observations carried out in 2011 showed that even though there were some negative impacts associated with natural-area tourism, the benefits to both the local communities and associated biological conservation outweighed the negatives. Natural-area tourism at Andasibe is well organised, with many local guide associations having partnerships with international organisations and 50% of park fees going directly to local communities. Forest loss is a widespread problem in Madagascar, but at Andasibe the forest is valued for its ecological function and as a generator of profits from natural-area tourism. Exploitation of the park was not observed. Andasibe is an example of how conservation and natural-area tourism can work together in Madagascar for the benefit of local communities and the environment. However, with the current unstable political climate and lack of adequate wider tourism and conservation planning frameworks, awakening to its potential as a leading conservation tourism destination will not be a simple task. Conservation implications: This research demonstrated that ecotourism can be an effective means of achieving conservation objectives, whilst, at the same time, improving the livelihoods of local people. We caution, however, that governments can do a lot more to encourage and support the nexus between tourism and conservation.

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