Impact of a toxic invasive species on freshwater crocodile (Crocodylus johnstoni) populations in upstream escarpments

2013 ◽  
Vol 40 (4) ◽  
pp. 312 ◽  
Author(s):  
Adam R. C. Britton ◽  
Erin K. Britton ◽  
Clive R. McMahon
Keyword(s):  
Negative Impact ◽  
Survey Methods ◽  
Cane Toad ◽  
Predator Species ◽  
Bite Marks ◽  
Crocodylus Johnstoni ◽  
Freshwater Crocodile ◽  
Conservation Concern ◽  
Local Extirpation ◽  
The Impact

Context Spread of the invasive cane toad (Rhinella marina) across northern Australia is of concern. Predator species, including the freshwater crocodile (Crocodylus johnstoni), are susceptible to cane toad toxins when ingested. Upstream populations of freshwater crocodiles are smaller than downstream counterparts because of limited resources. We measured the impact of cane toad arrival on densities of these upstream populations. Aims Our aim was to determine whether the influx of cane toads had a negative impact on populations of upstream ‘stunted’ freshwater crocodiles. Methods Population surveys for crocodiles were conducted in three upstream creek systems, using day- and night-based survey methods, before the arrival of cane toads in the area. These surveys were repeated under similar conditions following the arrival of cane toads, to compare the distribution and densities of freshwater crocodiles and, hence, measure the impact of cane toads. Key results There were significant declines in crocodile density at two survey sites following the arrival of cane toads, and we found dead crocodiles and cane toad carcasses with crocodile bite marks. The third site showed no change in density. There was a decline in mean density across all sites from 3.0 crocodiles km–1 to 1.1 crocodiles km–1 following the arrival of cane toads. Conclusions There was an overall decrease in crocodile densities and a reduction in distribution following the arrival of cane toads into the survey area. Dead crocodiles and evidence of their having eaten cane toads strongly suggest that these declines were caused directly by the arrival of cane toads into the area. One site showed no apparent change other than an increase in wariness, which may reflect the distribution of available feeding and shelter resources among the three sites. Implications These results suggest that upstream freshwater crocodile populations are highly susceptible to cane toad toxins, and that impacts on their population can include local extirpation. Considering their morphological and possibly genetic distinctiveness, the loss of these unique populations is of conservation concern.

The uneasy coexistence between Carpet Pythons and Cane Toads

2020 ◽  
Author(s):  
Gregory P. Brown ◽  
Jeremy Hemphill ◽  
Richard Shine
Keyword(s):  
Negative Impact ◽  
Prey Type ◽  
Direct Costs ◽  
Cane Toad ◽  
Predator Species ◽  
Indirect Benefits ◽  
Negative Impacts ◽  
Monitor Lizards ◽  
A Site ◽  
Free Ranging

We describe a case of a free-ranging Carpet Python Morelia spilota consuming a toxic Cane Toad Rhinella marina, and dying as a result. Such an encounter would not be surprising at the toad invasion front, where predators first confront this novel prey type. However, the encounter we describe occurred at a site near Darwin where toads have been present for fifteen years. Other reports suggest that the behaviour we observed occurs across the snake’s range. Lethal ingestion of toads has been suggested to threaten the viability of populations of Carpet Pythons, but paradoxically, our surveys at this site reveal a twofold increase in abundance of Carpet Pythons since the arrival of toads. Toad invasion likely has favoured pythons by reducing the abundance of large monitor lizards, that are both predators and competitors of Carpet Pythons. That advantage has outweighed occasional cases where a snake is fatally poisoned by consuming a toad. Thus, the overall impact of Cane Toads on Carpet Pythons (and likely, other predator species) is a balance between direct costs and indirect benefits. Negative impacts on individuals may not necessarily translate to a negative impact on the species.

scholarly journals ANALISIS KEPATUHAN PEMBAYARAN PAJAK PENGHASILAN PASAL 23 TOKO KELONTONG DI DI DESA BEJI

2021 ◽  
Author(s):  
Feni Setyorini ◽  
Defilatifah ◽  
Yulia aroningtias
Keyword(s):  
Income Tax ◽  
Negative Impact ◽  
Survey Methods ◽  
Grocery Store ◽  
Corporate Income Tax ◽  
Grocery Stores ◽  
Business Owner ◽  
Interview Survey ◽  
The Impact ◽  
Number Of Customers

The purpose of this study was to determine the calculation, deposit and reporting of Corporate Income Tax carried out at a grocery store in Beji Village and how the perception of grocery store owners towards the existence of a modern market. Knowing the impact of the existence of a modern market on tax payment compliance in the grocery store business. To achieve the objectives in this study used a qualitative type of research with interview survey methods. Qualitative analysis uses data reduction, data presentation, and drawing conclusions. The results showed. The existence of modern minimarkets on grocery stores has a negative impact on turnover, income and the number of customers so that the payment of corporate income tax that should be paid is ignored by the grocery store business owner.

Colonizing Cane Toads cause population declines in native predators: reliable anecdotal information and management implications

1997 ◽  
Vol 3 (1) ◽  
pp. 65 ◽  
Author(s):  
Scott Burnett
Keyword(s):  
Risk Assessment ◽  
Habitat Management ◽  
Extinction Risk ◽  
Population Declines ◽  
Cane Toad ◽  
Research Attention ◽  
Predator Species ◽  
Continental Scale ◽  
Definition Of ◽  
The Impact

This paper presents compelling, anecdotal evidence of severe population declines in five predator species, Dasyurus hallucatus, Varanus gouldii, V. mertensi, V. panoptes, and V. timorensis similis, in almost immediate response to Cane Toad colonization of their habitat in three widely distributed areas of northern Queensland. Furthermore, risk assessment of all quoll and monitor taxa whose distributions overlap the potential distribution of the Cane Toad in Australia (Sutherst et al. 1996), indicates that at the continental scale, three of the four quoll taxa and eight of the 20 monitor species examined are at high risk of severe population declines following Cane Toad colonization. One quoll taxon and seven monitor species are at moderate risk and five monitor species are at low risk. The definition of the threat which Cane Toads pose to native predators has received very little research attention, and fundamental questions including; which predator species are most at risk (testing of the risk assessment hypotheses presented here), the extent of these risks (is there a need to manage Cane Toad impacts upon predators?), and the contexts of intraspecific variation in relative extinction risk (for example, interactions of extinction risk with predator and Cane Toad population demography, climate, landscape, and land use), need to be assessed. Assuming that Cane Toads are found to have an impact across a range of taxa and landscapes (which I propose to be likely), management of the impact of this species on predators can be approached from two not necessarily exclusive directions; management of Cane Toad populations and management of predator populations, through both population and habitat management. At this stage, however, management from either viewpoint is constrained by a lack of published information relevant to autecology and fine scale distribution of predators.

scholarly journals ANALISIS KEPATUHAN PEMBAYARAN PAJAK PENGHASILAN PASAL 23 TOKO KELONTONG DI DI DESA BEJI

2021 ◽  
Author(s):  
Defilatifah ◽  
Yulia aroningtias ◽  
Feni Setyorini
Keyword(s):  
Income Tax ◽  
Negative Impact ◽  
Survey Methods ◽  
Grocery Store ◽  
Corporate Income Tax ◽  
Grocery Stores ◽  
Business Owner ◽  
Interview Survey ◽  
The Impact ◽  
Number Of Customers

The purpose of this study was to determine the calculation, deposit and reporting of Corporate Income Tax carried out at a grocery store in Beji Village and how the perception of grocery store owners towards the existence of a modern market. Knowing the impact of the existence of a modern market on tax payment compliance in the grocery store business. To achieve the objectives in this study used a qualitative type of research with interview survey methods. Qualitative analysis uses data reduction, data presentation, and drawing conclusions. The results showed. The existence of modern minimarkets on grocery stores has a negative impact on turnover, income and the number of customers so that the payment of corporate income tax that should be paid is ignored by the grocery store business owner.

Urbanization of fauna on the example of marsh frog (Pelophylax ridibundus)

2015 ◽  
Vol 26 (3-4) ◽  
pp. 116-123
Author(s):  
A. P. Korzh ◽  
T. V. Zahovalko
Keyword(s):  
Urban Areas ◽  
Cognitive Modeling ◽  
Negative Impact ◽  
Natural Populations ◽  
Cellular Level ◽  
Anthropogenic Factors ◽  
Migration Routes ◽  
Corrective Effect ◽  
The Impact ◽  
The City

Recently, the number of published works devoted to the processes of synanthropization of fauna, is growing like an avalanche, which indicates the extreme urgency of this theme. In our view, the process of forming devices to coexist with human and the results of his life reflects the general tandency of the modern nature evolution. Urbanization is characteristic for such a specific group of animals like amphibians, the evidence of which are numerous literature data. Many researchers use this group to assess the bioindicative quality of the environment. For this aim a variety of indicators are used: from the cellular level of life of organization up to the species composition of the group in different territories. At the same time, the interpretation of the results is not always comparable for different areas and often have significantly different interpretations by experts. Urban environment, primarily due to the contamination is extremely aggressive to amphibians. As a consequence, the urban populations of amphibians may be a change in the demographic structure, affecting the reproductive ability of the population, the disappearance of the most sensitive species or individuals, resizing animals, the appearance of abnormalities in the development, etc. At the same time play an important amphibians in the ecosystems of cities, and some species in these conditions even feel relatively comfortable. Therefore, it is interesting to understand the mechanisms of self-sustaining populations of amphibians in urban environments. To assess the impact of natural and anthropogenic factors on the development of amphibian populations were used cognitive modeling using the program Vensim PLE. Cognitive map of the model for urban and suburban habitat conditions were the same. The differences concerned the strength of connections between individual factors (migration, fertility, pollution) and their orientation. In general, factors like pollution, parasites, predators had negative impact on the population, reducing its number. The birth rate, food and migration contributed to raising number of individuals. Some of the factors affected on the strength to of each other as well: the majority of the factors affected the structure of the population, had an influence on the fertility. Thanks to it the model reflects the additive effect of complex of factors on the subsequent status of the population. Proposed and analyzed four scenarios differing strength and duration of exposure. In the first scenario, a one-time contamination occurs and not subsequently repeated. The second and third scenario assumes half board contamination, 1 year (2 scenario) and two years (scenario 3). In the fourth scenario, the pollution affected the population of amphibians constantly. In accordance with the results of simulation, much weaker than the natural populations respond to pollution - have them as an intensive population growth and its disappearance at constant pollution is slow. Changes to other parameters of the model showed that this pollution is the decisive factor -only the constant action leads to a lethal outcome for the populations. All other components of the model have a corrective effect on the population dynamics, without changing its underlying trand. In urban areas due to the heavy impact of pollution maintaining the population is only possible thanks to the migration process – the constant replenishment of diminishing micropopulations of natural reserves. This confirms the assumption that the form of existence metapopulations lake frog in the city. In order to maintain the number of amphibians in urban areas at a high level it is necessary to maintain existing migration routes and the creation of new ones. Insular nature of the placement of suitable habitats in urban areas causes the metapopulation structure of the types of urbanists. Therefore, the process of urbanization is much easier for those species whicht are capable of migration in conditions of city. In the initial stages of settling the city micropopulationis formed by selective mortality of the most susceptible individuals to adverse effects. In future, maintaining the categories of individuals is provided mainly due to migration processes metapopulisation form of the species of existence is supported). It should be noted that the changes in the previous levels are always saved in future. In the case of reorganizations of individuals we of morphology can assume the existence of extremely adverse environmental conditions that threaten the extinction of the micropopulations. 

Modernisation of Higher Education – Willful Action or Wishful Thinking? The Case of Bulgaria

2020 ◽  
Vol 8 (3) ◽  
pp. 3-17
Author(s):  
Elena Blagoeva
Keyword(s):  
Higher Education ◽  
Economic Crisis ◽  
Negative Impact ◽  
National Level ◽  
Sustainable Growth ◽  
Research Approach ◽  
Case Study Methodology ◽  
The Impact ◽  
The Eu

The impact of the last global economic crisis (2008) on the European economy put a strain on higher education (HE), yet it also pushed the sector towards intensive reforms and improvements. This paper focuses on the “Strategy for the Development of Higher Education in the Republic of Bulgaria 2014-2020”. With a case study methodology, we explore the strategic endeavours of the Bulgarian government to comply with the European directions and to secure sustainable growth for the HE sector. Our research question is ‘How capable is the Bulgarian HE Strategy to overcome the economic and systemic restraints of Bulgarian higher education?’. Because the development of strategies for HE within the EU is highly contextual, a single qualitative case study was chosen as the research approach. HE institutions are not ivory towers, but subjects to a variety of external and internal forces. Within the EU, this is obviated by the fact that Universities obtain their funds from institutions such as governments, students and their families, donors, as well as EU-level programmes. Therefore, to explore how these pressures interact to affect strategic action on national level, the case method is well suited as it enabled us to study the phenomena thoroughly and deeply. The paper suggests the actions proposed within the Strategy have the potential to overcome the delay, the regional isolation and the negative impact of the economic crisis on the country. Nevertheless, the key elements on which the success or failure of this Strategy hinges are the control mechanisms and the approach to implementation. Shortcomings in these two aspects of strategic actions in HE seem to mark the difference between gaining long-term benefits and merely saving face in front of international institutions.

PROFIL KERAGAMAN VEGETASI EKOSISTEM MANGROVE DI DESA TAMUKU KABUPATEN LUWU UTARA

2019 ◽  
Vol 5 ◽  
pp. 104
Author(s):  
Suhendra Purnawan ◽  
Subari Yanto ◽  
Ernawati S.Kaseng
Keyword(s):  
Survey Methods ◽  
Mangrove Ecosystem ◽  
Line Transect ◽  
Mangrove Forests ◽  
Vegetation Diversity ◽  
Line Transect Survey ◽  
Analysis Technique ◽  
Mangrove Vegetation ◽  
Data Collection Technique ◽  
The Impact

This study aims to describe the profile of vegetation diversity in the mangrove ecosystem in Tamuku Village, Bone-Bone-Bone District, North Luwu Regency. This research is a qualitative research using survey methods. The data collection technique uses the Quadrant Line Transect Survey technique. The data analysis technique uses the thinking flow which is divided into three stages, namely describing phenomena, classifying them, and seeing how the concepts that emerge are related to each other. The results of this study are the profile of mangrove vegetation in Tamuku Village, which is still found 16 varieties of true mangrove vegetation and 7 varieties of mangrove vegetation joined in the coastal area of Tamuku Village, Bone-Bone District, North Luwu Regency, South Sulawesi. The condition of mangrove vegetation in Tamuku Village is currently very worrying due to human activities that cause damage such as the project of normalization of flow, opening of new farms, disposal of garbage, water pollution due to chemicals, and exploitation of mangrove forests for living needs. The impact is ecosystem damage and reduced vegetation area as a place to grow and develop mangroves.

Has Aid Helped in Pakistan?

1997 ◽  
Vol 36 (4II) ◽  
pp. 947-957 ◽  
Author(s):  
Shahrukh Rafi Khan
Keyword(s):  
Economic Growth ◽  
Negative Impact ◽  
Negative Association ◽  
Causal Impact ◽  
The Impact ◽  
Over Time

This paper has a two-fold objective: first, to examine the terms on which Pakistan receives aid and whether its debt situation is sustainable, and second, to examine the impact of aid and debt on economic growth. It is found that there is little encouraging that can be said about how the terms on which Pakistan has received aid over time have changed, and its current debt situation is not sustainable. Also reported is the analysis done elsewhere which shows that aid has a negative (Granger) causal impact on GDP, and aid has a robust negative impact on economic growth after controlling for supplyside shocks. We provide various reasons for this negative association.

Green Beans Cultivation Using Mice Pets Control to Improve the Quality of Bintaro Fruit Extract

2018 ◽  
Vol 1 (1) ◽  
pp. 38
Author(s):  
Ajeng Embri Legawati ◽  
Nur Azizah ◽  
Achmad Ramadhan
Keyword(s):  
Natural Resources ◽  
Negative Impact ◽  
Green Beans ◽  
Fruit Extract ◽  
Bean Plants ◽  
Cultivation Technology ◽  
Environmental Balance ◽  
The Impact ◽  
Chemical Pesticides

Green beans cultivation technology using mice pets control has been implemented in the Gluranploso village, Benjeng Gresik. The implementation of the technology performed for 2.5 months from August to October 2017. The purpose of the implementation is aimed to reduce the dependence of farmers on the use of chemical pesticides so that the farmers are aware of the negative impact of chemical pesticides. Assessing the impact of the utilization of Bintaro fruit and fruit extracts to explore ways of making Bintaro as a natural biopesticide to overcome rat attack on green bean plants in the Gluranploso village. Pest control mice can reduce the rate of loss of the crops more effectively and efficiently. Finally, with the use of those natural resources as a biopesticide material can also maintain the environmental balance

The impact of the COVID-19 pandemic on the psychosocial condition of students in Poland and Ukraine

2020 ◽  
Author(s):  
Piotr Długosz ◽  
Yana
Keyword(s):  
Distance Learning ◽  
Negative Impact ◽  
Well Being ◽  
Survey Method ◽  
Psychosocial Condition ◽  
On Line ◽  
Line Survey ◽  
The Impact ◽  
Emotional Condition ◽  
Double Measurement

The article presents the results of research on psychosocial condition among Polish and Ukrainian students during the quarantine. The aim of the research was to verify the impact of the pandemic and its accompanying phenomena on the well-being of youth. In order to achieve this goal, the CAWI on-line survey method with double measurement was used. The first measurement carried out at the beginning of the quarantine resulted in 3659 filled out surveys in Poland and 739 in Ukraine. The second measurement conducted at the end of distance learning brought 1978 filled out surveys in Poland and 411 in Ukraine. The results of research indicate that the quarantine had a negative impact on the psychosocial condition of youth. The deterioration of emotional condition and the increase in mental disorders has been observed. Due to the pandemic and distance learning, the mental health of youth deteriorated significantly. Polish youth were negatively influenced by the pandemic to a greater extent than young Ukrainians.

Sign in / Sign up

Export Citation Format

Share Document