scholarly journals Habitat overlap and body condition in aquatic turtles: are there additive effects between invasive and native species?

2021 ◽  
pp. 2
Author(s):  
Daniel Escoriza ◽  
Pau Sunyer ◽  
Santiago Poch ◽  
Dani Boix
Keyword(s):  
Native Species ◽  
Natural Populations ◽  
Negative Effects ◽  
Emys Orbicularis ◽  
Habitat Overlap ◽  
Spatial Overlap ◽  
Negative Effect ◽  
Mauremys Leprosa ◽  
Scaled Mass Index ◽  
The Impact

Trachemys scripta (Reptilia, Emydidae) is among the most widespread invasive reptiles in the world. In general, it is assumed that this species has negative effects on native aquatic turtles based on experiments conducted under controlled conditions. Here, we analysed a 7‒year time series (2013‒2019) of data from captures of three species of turtles (two natives and one alien) from natural populations in the northeastern Iberian Peninsula. We evaluated (i) the interspecific spatial overlap and (ii) the correlation between the scaled mass index (SMI) of the native turtles and the abundance of T. scripta, including an interaction effect between the species. The analyses revealed that T. scripta has relatively low spatial overlap with Emys orbicularis but high overlap with Mauremys leprosa. Overall, the abundance of T. scripta was not associated with significant variations in the SMI of the native species, although for the female E. orbicularis, we detected a negative trend. The analyses also indicated that the abundance of T. scripta does not have an additive effect on the SMI of other turtles, even if there is a negative effect between native species. These findings suggested that the impact of T. scripta on other turtles could be density-dependent.

Impact of the Global Financial Crisis on IT Sector. The Case of Greece

2022 ◽  
Vol 9 (1) ◽  
pp. 0-0
Keyword(s):  
Global Financial Crisis ◽  
Extended Period ◽  
Early Years ◽  
Negative Consequences ◽  
Negative Effects ◽  
Innovation Development ◽  
Negative Effect ◽  
Greek Economy ◽  
The Global Financial Crisis ◽  
The Impact

The impact of the Information and Technology (IT) sector on the countries’ innovation development has been recognized as crucial in prior and recent research studies. Moreover, firms’ innovativeness affects positively countries’ economies. Nevertheless, the global economic crisis of the last decade constituted a significant barrier to the development of country economies and had a negative effect on firms’ performance. Specifically, the negative consequences of the global crisis became harder for Southern Europe Countries. More specifically the Greek economy was suffered by an extended period of crisis with harder consequences than those of other European countries. The main purpose of this study was to examine the financial performance of Greek IT firms in the early years of crisis. Our findings have been relevant to those of previous studies which observed negative effects of the financial recession on firms profitability.

scholarly journals Do abundance and proximity of the alien Impatiens glandulifera affect pollination and reproductive success of two sympatric co-flowering native species?

2012 ◽  
Vol 10 ◽  
pp. 130-139
Author(s):  
Valérie Cawoy ◽  
Mathieu Jonard ◽  
Carolin Mayer ◽  
Anne-Laure Jacquemart
Keyword(s):  
Reproductive Success ◽  
Native Species ◽  
Natural Populations ◽  
Pollen Deposition ◽  
Impatiens Glandulifera ◽  
Insect Behaviour ◽  
Native Flora ◽  
Visitation Rates ◽  
Aconitum Napellus ◽  
Negative Effect

In invasion ecology, potential impacts of aliens on native flora are still under debate. Our aim was to determine the pollinator mediated effects of both proximity and abundance of an alien species on the reproductive success of natives. We chose the highly invasive Impatiens glandulifera and two native species: Epilobium angustifolium and Aconitum napellus ssp. lusitanicum. These species share characteristics allowing for pollination interactions: similar biotopes, overlapping flowering periods and same main pollinators. The effects of abundance (5, 25 and 100 individuals) and proximity (0 and 15 m) of the alien on visitation rate, insect behaviour, pollen deposition and reproductive success of both natives were investigated during 2 flowering seasons. We used centred visitation rates as they can be directly interpreted as a positive or negative effect of the invasive.Both abundance and proximity of the alien increased bumblebee visitation rates to both natives. On the other hand, abundance of the exotic species had a slight negative effect on honeybee visits to natives while its proximity had no effect. The behaviour of bumblebees changed as visitors left significantly more often the native plants for I. glandulifera when its abundance increased. As a consequence of this “inconstancy”, bees deposited considerable quantities of alien pollen on native stigmas. Nevertheless, this interspecific pollen transfer did not decrease seed set in natives. Self-compatibility and high attractiveness of both native species probably alleviate the risk of altered pollinator services and reproductive success due to the invader in natural populations.

scholarly journals The Effect of Pesticides on the Microbiome of Animals

Agriculture ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 79 ◽  
Author(s):  
Mikhail Y. Syromyatnikov ◽  
Mariya M. Isuwa ◽  
Olga V. Savinkova ◽  
Mariya I. Derevshchikova ◽  
Vasily N. Popov
Keyword(s):  
Intestinal Microbiota ◽  
Mating Success ◽  
Taxonomic Composition ◽  
Scientific Data ◽  
Negative Effects ◽  
Negative Effect ◽  
Bacterial Biodiversity ◽  
Induced Changes ◽  
The Impact ◽  
Impact Of Pesticides

In recent decades an increase in the use of pesticides to protect plants from pests, diseases and weeds has been observed. There are many studies on the effects of various pesticides on non-target organisms. This review aims to analyze and summarize published scientific data on the effects of pesticides on the animal microbiome. Pesticides can affect various parameters of the animal microbiome, such as the taxonomic composition of bacteria, bacterial biodiversity, and bacterial ratios and modify the microbiome of various organisms from insects to mammals. Pesticide induced changes in the microbiome reducing the animal’s immunity. The negative effects of pesticides could pose a global problem for pollinators. Another possible negative effect of pesticides is the impact of pesticides on the intestinal microbiota of bumblebees and bees that increase the body’s sensitivity to pathogenic microflora, which leads to the death of insects. In addition, pesticides can affect vitality, mating success and characteristics of offspring. The review considers methods for correcting of bee microbiome.

scholarly journals The effects of introducing the Amazonian squirrel monkey on the behavior of the northeast marmoset

2015 ◽  
Vol 45 (1) ◽  
pp. 29-34 ◽  
Author(s):  
Fátima Luciana Miranda CAMAROTTI ◽  
Valdir Luna da SILVA ◽  
Maria Adélia Borstelmann de OLIVEIRA
Keyword(s):  
Squirrel Monkey ◽  
Native Species ◽  
Callithrix Jacchus ◽  
Observation Time ◽  
Saimiri Sciureus ◽  
Significant Difference ◽  
Negative Effect ◽  
Total Observation Time ◽  
Total Observation ◽  
The Impact

The squirrel monkey Saimiri sciureus, an endemic primate of the Amazonian Basin, has been introduced in many localities of the Atlantic Forest biome. Introduced exotic species gain a competitive advantage in their new environment because of a lack of natural predators, competitors or diseases. This advantage can result in a reduction in the resources for the endemic species. The aims of this work were to evaluate the level of adaptation, and monitor the forms of interaction and the impact caused by S. sciureus on the behavior of the native species Callithrix jacchus in the Saltinho Biological Reserve, Tamandaré, Pernambuco, Brazil. The behavior was assessed by use of scan sampling method, every 5 min. A total of 382 h (191 h or 2,292 scans per group) of time sampling was performed. Sixteen interactions were recorded. The interaction index was low and represented 2.4% of the total observation time. Interactions were significantly higher during the dry season (58.5%) relative to the rainy season (41.5%). Callithrix jacchus was intolerant to the presence of S. sciureus and the last one was more tolerant during the interactions. In the presence of S. sciureus, C. jacchus eating, foraging, resting, socializing, and self-grooming behaviors were reduced while alertness was increased. Territorial behavior showed no significant difference. In the presence of S. sciureus, on average, the group of marmosets assembled at a higher layer of the forest stratum. The results might indicate a negative effect of S. sciureus on the native species, C. jacchus.

scholarly journals The mutational load in natural populations is significantly affected by high primary rates of retroposition

2021 ◽  
Vol 118 (6) ◽  
pp. e2013043118 ◽  
Author(s):  
Wenyu Zhang ◽  
Chen Xie ◽  
Kristian Ullrich ◽  
Yong E. Zhang ◽  
Diethard Tautz
Keyword(s):  
Gene Evolution ◽  
Natural Populations ◽  
Distribution Patterns ◽  
Mutational Load ◽  
Negative Effects ◽  
Single Nucleotide ◽  
Species Comparisons ◽  
The Impact ◽  
Profiling Analysis

Gene retroposition is known to contribute to patterns of gene evolution and adaptations. However, possible negative effects of gene retroposition remain largely unexplored since most previous studies have focused on between-species comparisons where negatively selected copies are mostly not observed, as they are quickly lost from populations. Here, we show for natural house mouse populations that the primary rate of retroposition is orders of magnitude higher than the long-term rate. Comparisons with single-nucleotide polymorphism distribution patterns in the same populations show that most retroposition events are deleterious. Transcriptomic profiling analysis shows that new retroposed copies become easily subject to transcription and have an influence on the expression levels of their parental genes, especially when transcribed in the antisense direction. Our results imply that the impact of retroposition on the mutational load has been highly underestimated in natural populations. This has additional implications for strategies of disease allele detection in humans.

scholarly journals Optimizing the seismic effects of blasting in quarries by timing

2019 ◽  
pp. 48-62
Author(s):  
Ján Baulovič ◽  
Blažej Pandula ◽  
Julián Kondela ◽  
Marta Prekopová
Keyword(s):  
Natural Environment ◽  
Technical Problem ◽  
The Other ◽  
Negative Effects ◽  
Seismic Effects ◽  
Seismic Safety ◽  
Blasting Operation ◽  
Negative Effect ◽  
The Impact ◽  
Positive Effect

Recently, negative effects of the blasting operations and quantification of the seismic safety are regarded as very important technical problem in quarries. The impact of blasting operations is accompanied by both positive and negative seismic effects. For example, vibrations generated by explosion create very positive effect − when help to break the rocks, but, on the other hand, also result in negative effect − when affect constructions and natural environment in the vicinity of a blasting works site. If the vibrations are large enough, then the nearby objects could be damaged or destroyed. This article highlights the results of the blasting operation monitoring in limestone Lopušné Pažite quarry on Slovakia, which based on the rule that the negative effects depend on their range and strength. This method is applied in all quarries in Slovakia, which are close to settlements.

scholarly journals Impact of Protein Diet Supplements on Athletes

2021 ◽  
Vol 6 (2) ◽  
pp. 1-3
Author(s):  
Mohammad Athar
Keyword(s):  
Muscle Growth ◽  
The Body ◽  
Protein Diet ◽  
Negative Effects ◽  
Protein Supplements ◽  
Diet Supplements ◽  
Negative Effect ◽  
The Impact ◽  
Protein Diets ◽  
Day By Day

Protein supplements are one of the most commonly consumed nutritional supplements, whether by professional athletes or amateurs, even by those who use them for aesthetic purposes instead of sporting ones. The thirst for becoming better is increasing day by day and so is the quest for competition. Sports have been one of the greatest of platforms to showcase one’s talent, thus leading to constant hustle for getting better day by day. To improve the performance, diet and physical appearance of the body i.e. muscle growth of athletes, sports nutrient products are developed. The use of these protein supplements in diet has increased the physiological requirement of protein but whether the use of these supplements is having positive or negative effect on the host is still a topic of debate for many. Large amount of protein derived constituents end up in the large intestine in case of high protein diets as compared to medium or low protein diets, leading to more bacterial amino acid metabolism in colon having positive as well as negative effects on the host. We, here, will try to summarize the impact of protein diet supplements on athletes.

scholarly journals Effects of COVID-19-Related School Closures on Student Achievement-A Systematic Review

2021 ◽  
Vol 12 ◽  
Author(s):  
Svenja Hammerstein ◽  
Christoph König ◽  
Thomas Dreisörner ◽  
Andreas Frey
Keyword(s):  
Student Achievement ◽  
Low Socioeconomic Status ◽  
Evidence Based ◽  
Negative Effects ◽  
School Closures ◽  
Low Socioeconomic ◽  
Primary And Secondary Education ◽  
Negative Effect ◽  
The Impact ◽  
Future School

The COVID-19 pandemic led to numerous governments deciding to close schools for several weeks in spring 2020. Empirical evidence on the impact of COVID-19-related school closures on academic achievement is only just emerging. The present work aimed to provide a first systematic overview of evidence-based studies on general and differential effects of COVID-19-related school closures in spring 2020 on student achievement in primary and secondary education. Results indicate a negative effect of school closures on student achievement, specifically in younger students and students from families with low socioeconomic status. Moreover, certain measures can be identified that might mitigate these negative effects. The findings are discussed in the context of their possible consequences for national educational policies when facing future school closures.

scholarly journals Effects of COVID-19-Related School Closures on Student Achievement—A Systematic Review

2021 ◽  
Author(s):  
Svenja Hammerstein ◽  
Christoph König ◽  
Thomas Dreisoerner ◽  
Andreas Frey
Keyword(s):  
Student Achievement ◽  
Low Socioeconomic Status ◽  
Evidence Based ◽  
Negative Effects ◽  
School Closures ◽  
Low Socioeconomic ◽  
Negative Effect ◽  
K 12 ◽  
The Impact ◽  
Future School

The COVID-19 pandemic led to numerous governments deciding to close schools for several weeks in spring 2020. Empirical evidence on the impact of COVID-19-related school closures on academic achievement is only just emerging in the literature. The present work aimed to provide a first systematic overview of evidence-based studies on general and differential effects of COVID-19-related school closures in spring 2020 on student achievement in K–12. The findings indicate a considerably negative effect of school closures on student achievement specifically in younger students and students from families with low socioeconomic status. At the same time, certain measures can be identified that might mitigate these negative effects. The findings are discussed in the context of their possible consequences for future national educational policies when facing future school closures.

scholarly journals Does the exotic invader turtle, Trachemys scripta elegans, compete for food with coexisting native turtles?

2011 ◽  
Vol 32 (2) ◽  
pp. 167-175 ◽  
Author(s):  
Carmen Díaz-Paniagua ◽  
Natividad Pérez-Santigosa ◽  
Judith Hidalgo-Vila ◽  
Margarita Florencio
Keyword(s):  
Native Species ◽  
Age Groups ◽  
Trachemys Scripta ◽  
The Other ◽  
Trachemys Scripta Elegans ◽  
Emys Orbicularis ◽  
Invasive Crayfish ◽  
Exotic Invasive ◽  
Mauremys Leprosa ◽  
In The Wild

AbstractNowadays, established populations of exotic turtles, Trachemys scripta elegans, coexist with native turtles in the wild in southern Spain. We analysed the diet of this exotic species and compared it with the diet of the two native species (Mauremys leprosa and Emys orbicularis) in two ponds. The exotic turtle is an opportunistic omnivore. In one of our study ponds where exotic invasive crayfish were very abundant, adult and juvenile exotic turtles fed mainly on this prey. In the other study pond, juveniles fed mainly on animal matter and adults ate similar proportions of plants and animals. Native turtles also ingested mainly crayfish in the first study pond, but M. leprosa were mainly herbivorous in the second pond. We did not detect strong differences among the diets of the three species. While native species significantly differ in their diets, the exotic turtles did not differ from some groups of native ones. Exotic turtles had the widest range of food, overlapping the food spectra of different age groups of the two native species in both localities. Comparing with previous reports on native turtles diet of the same area, our results did not reveal changes in the diet which could be associated to interactions with exotic turtles, but the observed shift to a higher proportion of animals in the diet in one of the ponds were mainly due to the high abundance of exotic crayfish.

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