Category: Ecology

Endangered ecosystems: Review on conservation status of Asian rivers

Physical, chemical or biological changes in the environment that will affect its equilibrium are indeed a need of thorough investigations. For it will create a compounded effect from the lower living organisms up to a higher one. This particular article cited the conservation strategies that sustain life on tropical Asian rivers way back two decades ago. River ecology is dominated by flow seasonality imposed by monsoonal rains with profound consequences for fishes and zoobenthos. Riverine biodiversity is threatened by habitat degradation, pollution, flow regulation, river regulation and control as well as over-harvesting. It is emphasized on this article the factors affecting ecological niche of the river based on the survey. At different level from biotic and abiotic features which is very important in determining the flora and fauna.

 

Threats to tropical Asian Rivers

Water elements and hydrochemistry in relation to its topography and latitude will constitute the wide range factor in ecological balance. Floodplain ecology is economically importance for the breeding and feeding sites of fishes and other aquatic organisms. Between the riparian forests indicates the lateral-interactions for carbon processing as well as trophic production. Two decades ago technologies are not yet fully develop compared today yet problems of river system existed way back time. Seasonal change in Asia will also affect the amount of water in the river catchment.

 

Mekong River is significantly important for potential energy that is why United Nation makes a committee to investigate. Irrigations, dams have been established all along the Mekong River to control the floods. Yet it cause an environmental impact and environmental consequences which affects balance patterns of nature and its species itself. Like for example the change in inundation patterns that affects productivity. Changes in flow and temperature may remove important directive factors for breeding and migratory behavior of some species.

 

Proper policy implementation and regulation in River system are very important it must foresee wide range effect to the environment. One single action will affect the whole system of the environment. Though this is still open for argument nowadays since politics and businesses will always contradict for maintaining the pristine ecosystem. Adequate management and efforts in assessing environmental impacts and collaborative studies is indeed necessary. Also a manifestation and proper policy for a good river ecosystem management are deemed needed. This is the challenge and continuing advocacy to limnologists to visualize and assess the sustainability and conservation of river ecosystem.

 

Source: Prepared by Joan Tura from Springer Hydrobiologia 

Volume 248, Issue 3 pp 167–191

First record: Common bottlenose dolphin in Canadian Pacific waters

Common bottlenose dolphins are the largest species of the beaked dolphins that inhabits in temperate and tropical oceans worldwide. These species are large that mostly found in groups and known to mixed with other species like whales and cetaceans. Common bottlenose dolphin diet mainly squid, eel, shrimp and wide variety of fishes by swallowing a whole than chewing it. Dolphins usually search prey using echolocation in a form of sonar. And uses sounds for communication like squeaks emitted from blowhole, whistles from nasal sacs and body language. The coastal of United States Pacific is known to have around 450 individuals while the offshore population about 3,495 individuals. In Canadian west coast no common bottlenose dolphin has been documented. However, on July 29, 2017 a sighting of this species mixed with cetaceans and killer whales has been observed.

 

Common bottlenose dolphins observed in Canadian waters

For the first time common bottlenose dolphins have been observed on July 29, 2017 in Canadian water. Each individual shows particular characteristics like short to moderate beak. A curved mouth line that dips downward resembling like a smile and tall falcate dorsal fin at the central back. Moreover, the body colors were usually light grey to black on the back and side while light to white color around the belly.

 

The sighting of the large group of common bottlenose dolphins is the first confirmed occurrence in Canadian Pacific waters. The location of sighting is approximately 1000 km northwest coast of America which signifies the first northernmost record of the species. About 200 dolphins were seen in the group in an unusual large aggregation. On the other hand it was also observed that this dolphins traveling closely with false killer whales, a typically offshore species.

 

The discovery of common bottlenose dolphins and false killer whales signifies the warming trends in North Pacific waters. Both of the species typically inhabit warm temperate waters in lower latitudes. But this sighting indicates that British Columbia, Canada oceanic conditions gives suitable habitat for them. It is also recorded that the show-up happened after a prolonged warming period.

 

Source: Prepared by Joan Tura from  Springer Nature BMC Marine Biodiversity

Vol. 11: 3, 20 April 2018

Population trends, threats, and conservation of Waterbirds in China

Waterbirds are very important indicators in the ecosystem particularly wetlands. Due to climate change and human activities such as pollution, over-hunting and habitat loss about 23% globally are declining. Some have been listed as threatened species by the International Union for Conservation of Nature (IUCN) for about 19% worldwide. In view of this severe condition, waterbirds diversity has been rapidly decreasing and its conservation status received attention. In China there are 53.6 million hectares of wetlands making it the first among Asia and fourth in the world. There were different wetland types in China including swamps, rivers, lakes, coastal wetlands and estuaries. Conservation of waterbirds in China has been implemented establishing nature reserves, designating key habitat and captive breeding to increase population.

 

Population Trends of Waterbirds in China

According to Wetlands International there were 871 waterbird species in 32 families and 8 orders in the world. In China, 260 waterbird species has been identified that belongs to 21 families. 84 species exhibited a declining trend, 35 species remained stable while 16 species showed increasing trends. Threatened species includes Critically Endangered, Endangered, Vulnerable, Near Threatened, Least Concern and Data Deficient.  Moreover, the migratory and residents waterbirds suffered serious threats and a total of 38 species listed as threatened species. Also there were 6 species listed as Critically Endangered, 16 species Vulnerable, 16 species Endangered and 27 species as Near Threatened.

 

Threats to waterbirds include both direct and indirect human activities such as illegal hunting, disturbances, pollution and habitat loss. However, habitat loss is the most common threat because of large scale reclamation in both coastal and inland wetlands. According to the national surveys a decreased of 3.4 million hectares of wetlands wherein coastal losses more than inland wetlands. In recent years, continuous development and industrialization affects the natural habitats of waterbirds. In which foraging time have been reduced, vigilance behavior increased and recurrently being flushed away. As a consequence human disturbances forced the birds to abandon habitats and nest due to breeding failure.

 

Therefore, waterbirds in China might be in more serious situation than we thought that is why conservation must be implemented. Like restoration of degraded wetlands, public awareness, cracking down on illegal hunting and enforcement of Wildlife Protection Law. Additionally, restoration of highly threatened species through artificial intervention is needed. As well as promoting cooperation between international and regional information on conservation.

 

Source: Prepared by Joan Tura from Springer Nature BMC Avian Research

Published: 28 April 2018

 

Impact of environment on people’s everyday experiences in Stockholm

Urban environments are made from stone, concrete, bricks and glass that showcase a succession of signs, shapes and population. It is assemblage that is being categorized as safe, noisy, fun and peaceful or risky associated with law and policy. In order to build urban environments that limit negative impacts there is a need to comprehend people’s daily activities. Cities are designed well with nature and can be understood as natural support of both ecosystem integrity and public health. These spatial paradigms must be reconciled to achieve ecological sustainability from local to global impacts. So, this study aims to integrate compact and social-ecological city influenced by occurring experiences. Through quantifying relationships on different spatial accessibility of environmental features and people’s experiences.

 

Spatial distribution of urban environment features

Stockholm indicates large municipality and few areas can be described to have high residential density. In which urban environment features have significant impact on experiential outcome. Such a way that number of residents and proximity to nature has less statistically significant effects on people’s experiences. But shows high on natural temperature regulating capacities.  On the other hand frequency and duration of experiences in different environment are based on either positive or negative experiences. In which many positive experience last for few hours but occurs monthly. While negative experiences last only for a moment but occur several times per week.

 

The findings suggest that urban environments should not be thought simply as compact or green. But rather overlooks the substantial differences existing both urban and nature. The important of nature indicates that people are not asked to record certain kind of experience but somewhat regularly occurring. However, measures to mitigate climate change and halt biodiversity will not contribute to real sustainability. If simultaneously eroded the potential urban environment to support wellbeing.

 

More widely, the study reveals the usefulness of the concept of spatial analysis of urban environments. Through, providing innovative methodological toolbox to create a narrative of social-ecological urbanism. As well as in accommodating qualities of compact and identifying qualitative differences both urban and nature. Therefore, current urban planning needs to acknowledge these differences to limit impacts on biosphere while upholding human wellbeing. Moreover, transformation of negatively experienced urban areas designed to integrate possibilities to have daily basis on nature experiences and increased knowledge of this complex interplay to various parts of the planet.

 

Source: Prepared by Joan Tura from Landscape and Urban Planning

Volume 171, March 2018, Pages 7-17

Understanding the Venus flytrap through mathematical modelling

Venus flytrap is a carnivorous plant that catches its prey mostly insects and arachnids through snap-trap movement. It has a trapping structure that is triggered by tiny hairs in the inner surface of the plant leaves.  When insect crawling along, the plant trigger to close only if it caught a live insects worthy of consumption. This unique trapping mechanism drawn attention to scientific interest and called it “one of the most wonderful in the world”. However, only recently that snap-trap closure mechanism of the Venus flytrap fully understood. On the other hand it is also been studied the trade-off investment in snap-trap structures and its energetic benefits. But a little information has been established about prey selection and why the traps allow prey to escape. This paper provides the first mathematical cost-benefit model for carnivory in the Venus flytrap and understanding its ecology.

 

3 Stages of Venus flytrap prey captures and digestion

Venus flytrap captures and digests its prey into three stages.  Firstly, trap is open and the lobe stand at approximately right angle to each other waiting for prey to enter. In this stage when prey moves across the trap it generates stimuli a receptor potential then action potential. Secondly, after the signal for closure the trap shut and enters in a semi-closed state. It will remain semi closed until further mechanical stimuli to make sure that live prey has been caught. Thirdly, while the prey is struggling inside the trap it will further stimulate and cause the lobes to close tighter. In fully closed state the trap has essentially transformed into a stomach and start digesting.

 

The investigation reveals that Venus flytrap non- prey sources such as raindrops or wind caused trap closure. This mechanism is triggered once every two days and the trap wait for more than a month for a meal. However, bigger insect around 29mm will trap fully but smaller size less than 14.2mm can escape eventually. This carnivore plant is prey selective wherein the average size of prey is 20mm. Meaning, it utilizes 68.9% of its maximum potential. Moreover, optimal trap allows 76.8% of captured prey to escape indicating that Venus flytrap is highly selective in prey capture.

 

Indeed, the ecology of Venus flytrap is not understood well that is why investigating capturing and digestion of prey is important. This research provides the building blocks on modelling its ecological mechanism which could incorporate various stages of trap. Since the plant is highly adaptive to its habitat the traps grow quickly.

 

Source: Prepared by Joan Tura from Journal of Theoretical Biology

Volume 444, 7 May 2018, Pages 1-10

Electrochemical simulation of triclosan metabolism and toxicological evaluation

Triclosan is a broad spectrum antibacterial or antifungal agent found in some consumer products. Such as in antiseptic soaps, toothpaste, detergents, cosmetics, plastic kitchenware, carpets, socks and toys. Pharmaceuticals and personal care products raise concerns in recent years about triclosan potential threats to human health and ecosystem. The demand of triclosan globally continues to increase and its production exceeded to 1500 tons per year worldwide. Given its widespread application it has been detected in wastewater, soil, sediment and surface water. Hence, the purpose of this research study is to investigate phase I metabolism of triclosan using electrochemical simulation. Also it tends to examine toxicological effects and its metabolites.

 

Toxicological evaluation of Triclosan

Using the QSAR modeling tool was performed to evaluate the toxic potential values  on the tested compound. In which the specific adverse effects were predicted by analyzing binding affinity towards each protein. Toxicological effects of triclosan on zebrafish embryos include delay of otolith formation, spine malformation, pericardial edema and late eyes formation. Some other notable changes are retardation of eye, hemorrhage, yolk-sac shrinkage and low heartbeat rate. Clearly, toxicological effects of triclosan on zebrafish are consistent to other research studies in literature. Moreover, it also shows that metabolites may induce similar adverse effects particularly the cardiovascular disorder.

 

Indeed, the research study was successfully simulated triclosan metabolism using electrochemical evaluation and its metabolites using modeling tools and bioassays. There were eight potential metabolites  were form via hydroxylation, ether cleavage and cyclization. Two dioxin derivatives were discovered for the first time and acts as potential metabolites. However, after the electrochemical reaction leads to induced high toxicity on zebrafish embryos. Therefore, the changes of acute toxicity through three transformation pathways indicate that only ether-bond can detoxify triclosan. While other transformation products formed highly toxic.

 

Hence, the study highlights that triclosan and its metabolites can cause serious effects in aquatic ecosystem if it is used continuously. It should be regulated in products utilization and considered as the major contaminants in the environment. To avoid further damaged and disruption especially to aquatic organisms and even to humans. Since most of the products containing triclosan are rinsed down and enter into sewerage and waste effluent.

 

Source: Prepared by Joan Tura from Science of the Total Environment

Volumes 622–623, 1 May 2018, Pages 1193-1201

Climate change, ethics and sustainability: An innovative approach

Climate change is a phenomenon nowadays that is well studied in the field of natural sciences. The aim of this article is to contribute an innovative approach and ethical sustainability to tackle possible solutions on climate change. It is also focused on how to synthesize different approaches on areas being affected. Hence, human being is included in the basic variable of change in the framework of fundamental ecology. That is why it is important to consider a broader view of climate change from historical perspective.

 

Global warming

The increase in Earth’s average temperatures at different latitudes is clear evidence that human action influence the process. The elimination of greenhouse gas particularly carbon dioxide and other gases which is known to increase temperature need to be address. Also the preservation of plant and animals as well as the biodiversity of the ocean and other ecosystems requires attention. Global warming on the other hand increased temperature, sea level rise, acidification and deterioration of habitat draws awareness of human being conditions.

Climate change: a broader vision

Science in different field conducted research study about the phenomenon of climate change. These includes geology particularly stratigraphy that focus on the study of stratified sedimentary, metamorphic and volcanic rocks.The archaeological stratigraphy that deals with the strata of soil according to age. In which the older is found at the deepest portion and the younger one is on the top. Moreover, paleontology is one of the considerations wherein the remains of living existence have been recorded through time.

The concept of sustainability

Sustainability in broader concept pertains to the ability to endure satisfaction of the present needs without compromising the future generation. It is a feature by which system or element remain functional and active over time. Resources can be used responsibly to ensure the balance in the economy, environment and social welfare.Climate change is a global problem implicating many countries especially those that are affected directly.

 

Therefore, the approach on climate change needs to consider the anthropological, geological, paleontological and ethical perspectives. Global warming is the key factor to resolve this phenomenal problem, since nature does not have an infinite resources. It does not have unlimited capacity to regenerate as a results, all living existence pay the price for exploiting the natural resources.

 

Sources: Prepared by Joan Tura from the Journal of Innovation and Knowledge,1 February 2018.

 

 

Global Carbon Cycling on a Heterogeneous Seafloor

Carbon, nitrogen and oxygen are the fundamental elements of life on Earth. Global carbon varies in amount and its capacity to provide realistic ecosystem response

Carbon cycle
Complexities of two perspectives of carbon cycles.

to environmental changes. In the past century ecological changes increased and the prediction of  the important role of the ocean in global carbon cycle

 

 

 

 

 

 

Where Has All the Carbon Gone?

seafloor biotaGlobal carbon  illustrate the seafloor heterogeneity that influence biodiversity and offers substantial variability in biological process.Transformation of organic matter into living tissues that respires oxygen and releases carbon dioxide add to the global carbon cycle. Increase in population attributes to the changes in global carbon including species response to the global environmental changes. On the other hand carbon cycling from shallow to deep seafloor ecosystems emphasizes the importance of organisms in global carbon models. Indeed, seabed ecosystem varies in organic matter that associate to the increase of global carbon processing.

 

Biogeochemical and Biological Model of carbon estimates

Carbon cycle on the seafloorGlobal carbon turnover has two simple approaches. First, the used of widely develop geochemical model of carbon to the deep ocean. As well as the production of organic matter near the surface and net remineralizaton of water column dominates global carbon. On the other hand lateral transport and interaction of biological pump comprises at least 50% organic carbon to the seafloor. Second, the used of biological based turnover rate calculated as sediment oxygen consumption rate over the seafloor standing biomass. Organisms consuming organic matter draws parallel effect to the total biomass on global carbon turnover.

 

Indeed, global carbon cycles requires better model to create not only the precise estimates of carbon degradation. But also on more specific projections on environmental changes. The seafloor biota in global carbon patterns also affects carbon processing. Furthermore, cautions in drawing inferences is needed in determining the flows of global carbon cycling. Thus biogeochemical  models does not totally lodge significant variables considering the changes in abiotic and biotic. Therefore, it is needed to generate proper evaluation in global carbon cycles because it emphasizes various aspects on global climate change.

 

 

Source: Trends in Ecology and Evolution  

https://www.sciencedirect.com/science/article/pii/S0169534717302860