scholarly journals First Report on Chronic Effects of Non-Microcystin Producing Cyanobacteria, Cylindrospermopsis curvispora and Planktothrix sp., on Daphnia magna

2016 ◽  
Vol 5 (2) ◽  
pp. 118 ◽  
Author(s):  
Thanh-Son Dao ◽  
Thi-My-Chi Vo ◽  
Thanh-Luu Pham
Keyword(s):  
Daphnia Magna ◽  
Life History Traits ◽  
Trophic Levels ◽  
Ecological Interactions ◽  
Negative Effects ◽  
First Report ◽  
Toxic Metabolites ◽  
Negative Impacts

<p class="emsd-body"><span lang="EN-GB">Cyanobacteria are an essential part of aquatic ecosystems. However, they can cause detrimental impacts on other organisms of higher tropic levels in water bodies because of their potent toxic metabolites (e.g. microcystin) and other bioactive compounds. In this study we tested the long-term and negative effects of two non-microcystin producing cyanobacteria <em>Cylindrospermopsis curvispora</em> and <em>Planktothrix</em> sp. from Vietnam on <em>Daphnia magna</em> under the laboratory conditions. The animal was fed with mixtures of green alga, <em>Scenedesmus</em> sp., and <em>C. curvispora</em> or <em>Planktothrix</em> sp. at different ratios (100 % <em>Scenedesmus, </em>10 % cyanobacteria + 90 % <em>Scenedesmus</em>, 50 % cyanobacteria + 50 % <em>Scenedesmus</em>, 100 % cyanobacteria) over a period of 21days. The results showed that the <em>D. magna</em> fed with from 10 to 100 % cyanobacteria reduced their survival with density dependence, delayed or postponed its maturation. Besides, the cyanobacteria also inhibited the reproduction of adult <em>D. magna</em> consequently strongly prevent the next population development of <em>D. magna</em>. The species <em>C. curvispora</em> had stronger effect on survival, but less impact on maturation and reproduction of <em>D. magna</em> than <em>Planktothrix</em> sp, negatively. To our knowledge, this is the first report on negative effects of <em>C. curvispora</em> and <em>Planktothrix</em> sp. from Vietnam on life history traits of <em>D. magna</em>. Additionally, our results revealed that even non-microcystin producing cyanobacteria at low density could also have negative impacts on zooplankton consequently ecological balance interference. In situ investigations on the effects of cyanobacteria on zooplankton are suggested for more understanding on the ecological interactions of the two trophic levels of aquatic ecosystem.</span></p>

Fungi and diseases — natural components of healthy forestsThis article is one of a collection of papers based on a presentation from the Stem and Shoot Fungal Pathogens and Parasitic Plants: the Values of Biological Diversity session of the XXII International Union of Forestry Research Organization World Congress meeting held in Brisbane, Queensland, Australia, in 2005.

Botany ◽  
2009 ◽  
Vol 87 (1) ◽  
pp. 22-25 ◽  
Author(s):  
M. E. Ostry ◽  
G. Laflamme
Keyword(s):  
Fungal Pathogens ◽  
Biological Diversity ◽  
Forest Health ◽  
Disease Outbreaks ◽  
Ecological Interactions ◽  
Negative Effects ◽  
Land Owners ◽  
Negative Impacts ◽  
The Many ◽  
Native Fungi

Forest health is described and perceived in different ways by the general public, land owners, managers, politicians, and scientists, depending on their values and objectives. Native tree pathogens and diseases are often associated with negative impacts even though damage is limited or not widespread. Too often, the concepts of tree health and forest health are used interchangeably and are not related to scale. Similar to fire, occurrences of disease outbreaks focus on the negative effects. However, native pathogens often exist in equilibrium with natural forest communities so their critical ecological roles are not easily discernible. Examined holistically, native fungi and diseases, dead and dying trees, and the many complex ecological interactions among them provide valuable benefits that ultimately contribute to sustainable, healthy forest ecosystems.

First report on the efficacy of l-alanine-based in situ-forming implants for the long-term parenteral delivery of drugs

2005 ◽  
Vol 108 (2-3) ◽  
pp. 433-441 ◽  
Author(s):  
François Plourde ◽  
Aude Motulsky ◽  
Anne-Claude Couffin-Hoarau ◽  
Didier Hoarau ◽  
Huy Ong ◽  
...  
Keyword(s):  
First Report ◽  
Parenteral Delivery ◽  
In Situ Forming ◽  
In Situ Forming Implants

scholarly journals Detrimental impacts of toxic Microcystis aeruginosa from Vietnam on life history traits of Daphnia magna

2016 ◽  
Vol 8 (1) ◽  
pp. 56-61
Author(s):  
Thi My Chi Vo ◽  
Thanh Luu Pham ◽  
Thanh Son Dao
Keyword(s):  
Life History ◽  
Daphnia Magna ◽  
Microcystis Aeruginosa ◽  
Life History Traits ◽  
Scientific Information ◽  
Reproductive Age ◽  
Viet Nam ◽  
Negative Effects ◽  
The Individual ◽  
Population Rate

In this study, we tested the long-term and negative effects of microcystin-producing cyanobacterium Microcystis aeruginosa from Vietnam on Daphnia magna under the laboratory conditions. The test organisms were fed with mixtures of green alga Scenedesmus armatus and toxic M. aeruginosa at different ratios (10% Microcystis + 90% Scenedesmus, 50% Microcystis + 50% Scenedesmus, 100% Microcystis, and 100% Scenedesmus) for over a period of 21 days. The life history traits of the organisms such as, survival, maturation, fecundity were daily recorded. Besides, the intrinsic population rate of D. magna in each treatment was also calculated based on the survivorship, the reproductive age and the clutch size of the animals. The results showed that survival, maturation and reproduction of the D. magna fed with 10, 50 and 100% M. aeruginosa was impaired. Additionally, the intrinsic population rate of the exposed D. magna was lower than that of the control. This study evidenced the adverse effects of toxic M. aeruginosa on both the individual and intrinsic population levels of D. magna. To our knowledge, this is the first report on the chronically detrimental impacts of toxic M. aeruginosa isolated from Vietnam on D. magna and contributed the scientific information on the severe influences of toxic cyanobacteria world wide. Trong bài viết này, chúng tôi nghiên cứu ảnh hưởng xấu mãn tính của loài vi khuẩn lam Microcystis aeruginosa có khả năng sản sinh độc tố microcysin từ Việt Nam lên Daphnia magna trong điều kiện phòng thí nghiệm. Sinh vật thí nghiệm được cho ăn với hỗn hợp tảo lục Scenedesmus armatus và M. aeruginosa có độc ở các tỷ lệ khác nhau (10% Microcystis + 90% Scenedesmus, 50% Microcystis + 50% Scenedesmus, 100% Microcystis, và 100% Scenedesmus) trong thời gian 21 ngày. Các đặc điểm vòng đời của sinh vật bao gồm sức sống, sự thành thục, sức sinh sản được theo dõi hàng ngày. Bên cạnh đó, tỷ lệ phát triển quần thể của D. magna trong từng lô thí nghiệm cũng được tính toán dựa vào sức sống, tuổi sinh sản và kích cỡ sinh sản của sinh vật. Kết quả cho thấy, sức sống, tuổi thành thục và sự sinh sản của D. magna cho ăn với 10, 50 và 100% M. aeruginosa bị ảnh hưởng xấu. Bên cạnh đó, tỷ lệ phát triển quần thể của D. magna trong lô phơi nhiễm thấp hơn so với đối chứng. Nghiên cứu này chứng minh ảnh hưởng xấu của M. aeruginosa có độc lên cả hai mức độ cá thể và quần thể của D. magna. Theo hiểu biết của chúng tôi, đây là báo cáo đầu tiên về ảnh hưởng xấu mãn tính của M. aeruginosa có độc phân lập từ Việt Nam lên D. magna and đóng góp thêm thông tin khoa học cho những ảnh hưởng nghiêm trọng của vi khuẩn lam có độc trên khắp thế giới.

The Local Impacts of World Bank Development Projects Near Sites of Conservation Significance

2018 ◽  
Vol 27 (3) ◽  
pp. 299-322 ◽  
Author(s):  
Graeme M. Buchanan ◽  
Bradley C. Parks ◽  
Paul F. Donald ◽  
Brian F. O’Donnell ◽  
Daniel Runfola ◽  
...  
Keyword(s):  
World Bank ◽  
Tree Cover ◽  
Response Monitoring ◽  
Development Projects ◽  
Negative Effects ◽  
Environmentally Sensitive ◽  
Negative Impacts ◽  
Local Impacts ◽  
World Bank Project

We evaluated the local impacts of World Bank development projects on sites of recognized conservation significance (Important Bird and Biodiversity Areas [IBAs]) using tree cover change data and in situ state, pressure, and response monitoring data. IBAs adjacent to World Bank project locations and a matched set of IBAs distant from World Bank project locations had similar rates of tree loss and similar in situ measurements of conservation outcomes. Thus, we did not detect any significant net negative impacts of World Bank projects on tree cover or conservation outcomes. These results are encouraging because 89% of World Bank projects that are close to IBAs are environmentally sensitive projects (so-called Category A and Category B projects) subjected to the organization’s most stringent safeguards. However, the limitations of our evaluation design do not allow us to rule out the possibility that World Bank projects had positive or negative effects that were undetectable.

scholarly journals Demographic and genetic factors in the recovery or demise ofex situpopulations following a severe bottleneck in fifteen species of Hawaiian tree snails

PeerJ ◽  
2015 ◽  
Vol 3 ◽  
pp. e1406 ◽  
Author(s):  
Melissa R. Price ◽  
David Sischo ◽  
Mark-Anthony Pascua ◽  
Michael G. Hadfield
Keyword(s):  
Life History Traits ◽  
Human Impacts ◽  
Ex Situ ◽  
Wild Populations ◽  
Captive Populations ◽  
Introduced Predators ◽  
In Captivity ◽  
Term Data

Wild populations of endangered Hawaiian tree snails have declined precipitously over the last century due to introduced predators and other human impacts. Life history traits, such as very low fecundity (<5 offspring per year across taxa) and maturity at approximately four years of age have made recovery difficult. Conservation efforts such asin situpredator-free enclosures may increase survival to maturity by protecting offspring from predation, but no long-term data existed prior to this study demonstrating the demographic and genetic parameters necessary to maintain populations within those enclosures. We evaluated over 20 years of evidence for the dynamics of survival and extinction in captiveex situpopulations of Hawaiian tree snails established from wild-collected individuals. From 1991 to 2006, small numbers of snails (<15) from fifteen species were collected from the wild to initiate captive-reared populations as a hedge against extinction. This small number of founders resulted in a severe bottleneck in each of the captive-reared populations. We identified key demographic parameters that predicted population recovery from this bottleneck. Species with captive populations that produced between two and four offspring per adult per year and had 20–50% of those offspring survive to maturity recovered to numbers above 100 individuals, and maintained viable populations following a decline that occurred between 2009 and 2014. Those populations that had less than two offspring per adult per year and less than 20% survival to maturity did not reach 100 individuals in captivity, and many of these populations died out during the recent decline. We suggest that small reductions in fitness may contribute to extirpation in taxa with inherently low fecundity, by keeping populations below a threshold number essential to long-term recovery. Futureex situpopulations should be founded with no less than 15 adults, and maintained in conditions closely approximating the temperature and humidity of source locations to optimize fitness. Permanent translocations of wild populations for conservation purposes will be more likely to succeed with greater than 100 adults, and should be limited to locations with a similar climate to source locations.

scholarly journals The potential impact of the COVID-19 pandemic on tuberculosis: a modelling analysis

2020 ◽  
Author(s):  
Lucia Cilloni ◽  
Han Fu ◽  
Juan F Vesga ◽  
David Dowdy ◽  
Carel Pretorius ◽  
...  
Keyword(s):  
Negative Impact ◽  
Negative Effects ◽  
High Burden ◽  
Targeted Interventions ◽  
Modelling Analysis ◽  
Incidence And Mortality ◽  
Negative Impacts ◽  
Epidemiological Impact ◽  
The Impact

Background Routine services for tuberculosis (TB) are being disrupted by stringent lockdowns against the novel SARS-CoV-2 virus. We sought to estimate the potential long-term epidemiological impact of such disruptions on TB burden in high-burden countries, and how this negative impact could be mitigated. Methods We adapted mathematical models of TB transmission in three high-burden countries (India, Kenya and Ukraine) to incorporate lockdown-associated disruptions in the TB care cascade. The anticipated level of disruption reflected consensus from a rapid expert consultation. We modelled the impact of these disruptions on TB incidence and mortality over the next five years, and also considered potential interventions to curtail this impact. Results Even temporary disruptions can cause long-term increases in TB incidence and mortality. We estimated that a 3-month lockdown, followed by 10 months to restore normal TB services, would cause, over the next 5 years, an additional 1.92 million TB cases (Crl 1.74 - 2.15) and 488,000 TB deaths (CrI 449 - 541 thousand) in India, 48,000 (33,400 - 72,320) TB cases and 16,800 deaths (11.9 - 21.9 thousand) in Kenya, and 9,100 (6,980 - 11,200) cases and 1,960 deaths (1,620 - 2,350) in Ukraine. However, any such negative impacts could be averted through supplementary 'catch-up' TB case detection and treatment, once restrictions are eased. Interpretation Lockdown-related disruptions can cause long-lasting increases in TB burden, but these negative effects can be mitigated with targeted interventions implemented rapidly once lockdowns are lifted.

scholarly journals Phytoplankton Phenology in the Coastal Zone of Cyprus, Based on Remote Sensing and In Situ Observations

2021 ◽  
Vol 14 (1) ◽  
pp. 12
Author(s):  
Monica Demetriou ◽  
Dionysios E. Raitsos ◽  
Antonia Kournopoulou ◽  
Manolis Mandalakis ◽  
Spyros Sfenthourakis ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Time Series ◽  
Phytoplankton Biomass ◽  
Trophic Levels ◽  
Data Availability ◽  
Ocean Colour ◽  
Chl A ◽  
In Situ Data

Alterations in phytoplankton biomass, community structure and timing of their growth (phenology), are directly implicated in the carbon cycle and energy transfer to higher trophic levels of the marine food web. Due to the lack of long-term in situ datasets, there is very little information on phytoplankton seasonal succession in Cyprus (eastern Mediterranean Sea). On the other hand, satellite-derived measurements of ocean colour can only provide long-term time series of chlorophyll (an index of phytoplankton biomass) up to the first optical depth (surface waters). The coupling of both means of observations is essential for understanding phytoplankton dynamics and their response to environmental change. Here, we use 23 years of remotely sensed, regionally tuned ocean-colour observations, along with a unique time series of in situ phytoplankton pigment composition data, collected in coastal waters of Cyprus during 2016. The satellite observations show an initiation of phytoplankton growth period in November, a peak in February and termination in April, with an overall mean duration of ~4 months. An in-depth exploration of in situ total Chl-a concentration and phytoplankton pigments revealed that pico- and nano-plankton cells dominated the phytoplankton community. The growth peak in February was dominated by nanophytoplankton and potentially larger diatoms (pigments of 19’ hexanoyloxyfucoxanthin and fucoxanthin, respectively), in the 0–20 m layer. The highest total Chl-a concentration was recorded at a station off Akrotiri peninsula in the south, where strong coastal upwelling has been reported. Another station in the southern part, located next to a fish farm, showed a higher contribution of picophytoplankton during the most oligotrophic period (summer). Our results highlight the importance of using available in situ data coupled to ocean-colour remote sensing, for monitoring marine ecosystems in areas with limited in situ data availability.

scholarly journals “I don’t have an address”: Housing instability and domestic violence in help-seeking calls to a support service

2020 ◽  
Author(s):  
Ann Weatherall ◽  
Emma Tennent
Keyword(s):  
Support Services ◽  
Help Seeking ◽  
Support Service ◽  
Housing Instability ◽  
Gendered Violence ◽  
Institutional Practice ◽  
Social Support Services ◽  
Negative Impacts

Increasing recognition of the long-term negative impacts of gendered violence has led to the establishment of a variety of social support services. Feminist research has examined the barriers that prevent women from accessing these services and the problems women report getting the help they need. However, little is known about what happens in situ when women interact with support services. This paper is a novel empirical investigation of naturalistic social interactions where women seek help with problems resulting from violence at home. We used conversation analysis to examine how problems of housing instability and help-seeking unfolded in recorded telephone calls to a victim support service. We found that the routine institutional practice of asking for an address posed interactional trouble for women who were seeking to leave violence, had left a violent home, or were homeless as a result of violence. When answers could not be provided, callers’ responses included disclosures of violence or challenges to the meanings of address. Our findings point to an interactional burden that women confront in institutional interactions. We suggest institutions should carefully consider how routine practices such as asking for an address might pose unintended problems for service users in vulnerable circumstances.

scholarly journals “I don’t have an address”: Housing instability and domestic violence in help-seeking calls to a support service

2020 ◽  
Author(s):  
Ann Weatherall ◽  
Emma Tennent
Keyword(s):  
Support Services ◽  
Help Seeking ◽  
Support Service ◽  
Housing Instability ◽  
Gendered Violence ◽  
Institutional Practice ◽  
Social Support Services ◽  
Negative Impacts

Increasing recognition of the long-term negative impacts of gendered violence has led to the establishment of a variety of social support services. Feminist research has examined the barriers that prevent women from accessing these services and the problems women report getting the help they need. However, little is known about what happens in situ when women interact with support services. This paper is a novel empirical investigation of naturalistic social interactions where women seek help with problems resulting from violence at home. We used conversation analysis to examine how problems of housing instability and help-seeking unfolded in recorded telephone calls to a victim support service. We found that the routine institutional practice of asking for an address posed interactional trouble for women who were seeking to leave violence, had left a violent home, or were homeless as a result of violence. When answers could not be provided, callers’ responses included disclosures of violence or challenges to the meanings of address. Our findings point to an interactional burden that women confront in institutional interactions. We suggest institutions should carefully consider how routine practices such as asking for an address might pose unintended problems for service users in vulnerable circumstances.

scholarly journals “I don’t have an address”: Housing instability and domestic violence in help-seeking calls to a support service

2020 ◽  
pp. 095935352096397
Author(s):  
Ann Weatherall ◽  
Emma Tennent
Keyword(s):  
Support Services ◽  
Help Seeking ◽  
Support Service ◽  
Housing Instability ◽  
Gendered Violence ◽  
Institutional Practice ◽  
Social Support Services ◽  
Negative Impacts

Increasing recognition of the long-term negative impacts of gendered violence has led to the establishment of a variety of social support services. Feminist research has examined the barriers that prevent women from accessing these services and the problems women report getting the help they need. However, little is known about what happens in situ when women interact with support services. This paper is a novel empirical investigation of naturalistic social interactions where women seek help with problems resulting from violence at home. We used conversation analysis to examine how problems of housing instability and help-seeking unfolded in recorded telephone calls to a victim support service. We found that the routine institutional practice of asking for an address posed interactional trouble for women who were seeking to leave violence, had left a violent home, or were homeless as a result of violence. When answers could not be provided, callers’ responses included disclosures of violence or challenges to the meanings of address. Our findings point to an interactional burden that women confront in institutional interactions. We suggest institutions should carefully consider how routine practices such as asking for an address might pose unintended problems for service users in vulnerable circumstances.

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