Firing back

نویسنده

  • Nigel Williams
چکیده

voluntarily herd shoals of fish towards fishing boats. The fishermen benefit from enhanced catches and the dolphins feed on the entrapped fish, as well as getting some rewards from the fishermen. Nonetheless, numbers of dolphins have declined in Myanmar as a result of electrocution through illegal electric fishing, entanglement in nets, mercury poisoning and habitat loss from gold mining. Myanmar’s fisheries department and WCS found that the species had declined by some 60 per cent in the region, and that only 59 to 72 individuals remained in the river region, approximately 1,000 kilometres from the sea. The WCS has helped establish protected areas along the Ayeyarwady river to help conserve this rare mammal and boost awareness “of its unique role in the river’s livelihoods”, says the WCS. are to the impacts of humans, conservationists say. The WCS is now working with the ministry of environment and forests in Bangladesh on plans for establishing a protected area for both Irrawaddy and Ganges River dolphins in the Sunderbans mangrove forest. “WCS’s discovery that a thriving population of Irrawaddy dolphins exists in Bangladesh gives us hope for protecting this and other endangered species and their important habitats,” says Stephen Sanderson, president of the WCS. The WCS “is committed to conservation of these iconic marine species from dolphins, sea turtles, sharks to the largest whales.” The Irrawaddy dolphin has already won some friends. In Myanmar’s Ayeyarwady river, these dolphins are known for their ‘cooperative fishing’ with humans. Animals are known to Hidden: An estimated 6,000 Irrawaddy dolphins have been found to inhabit the mangrove forests of Bangladesh. (Photo: Alice Rocco.) The state of Victoria experienced some of the worst bush fires recorded in Australia earlier this year with many people killed by the various blazes that raged through the height of the summer under searing temperatures and northerly winds. The fires are also expected to have had a devastating effect on the fauna of the area, with the speed of spread making it difficult for many animals to escape. But recent pictures from one of the most devastated areas shows that within weeks, the charred trunks of many trees are already sprouting new growth, revealing just how the flora has adapted to bush fires that, in less devastating circumstances, appear part of the normal cycle in this environment. And Victoria’s environment minister, Gavin Jennings, announced at the beginning of the month that the state’s parks would be open for Easter. “We are confident that people will be safe in the parks,” he said. But an understanding of the longerterm damage of the bush fires to a remarkable environment will take some time to assess. The Australian bush is already regenerating after record fires, reports Nigel Williams. Firing back

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Rapid Thermal Processing for Front and Rear Contact Passivation

Rapid firing processes are well known to allow improvements in solar cell contacts, particularly for the rear contact. Previous results characterizing the quality of a rear aluminum-alloyed back surface field have measured the effective surface recombination velocity, which depends not only on the material parameters of the back surface field, but also on the base doping. This paper shows that ...

متن کامل

Design and Construction of a Sensorless Circuit for Brushless DC Motor using Third Harmonic back Electromotive Force

In this paper the method of sensorless startup of direct current brushless motor using third harmonic back Electromotive Force (EMF) and motor startup using microcontroller for pulse width modulation, power switch control and motor output analysis is presented which renders RPM control and high speed achievement for motor. The microcontroller is used for processor and MOSFETs are used for power...

متن کامل

On the back-firing instability.

The onset of the back-firing instability is studied in a one-dimensional spatially extended and dissipative system, where propagating localized solutions become unstable. It corresponds to the emission in the tail of a solitary wave of a new wave propagating in the opposite direction. The transition is illustrated, in geometrical terms, using a model normal form equation. (c) 2004 American Inst...

متن کامل

Prolonged sodium channel inactivation contributes to dendritic action potential attenuation in hippocampal pyramidal neurons.

During low-frequency firing, action potentials actively invade the dendrites of CA1 pyramidal neurons. At higher firing rates, however, activity-dependent processes result in the attenuation of back-propagating action potentials, and propagation failures occur at some dendritic branch points. We tested two major hypotheses related to this activity-dependent attenuation of back-propagating actio...

متن کامل

Optimization of Self-Doping Ag Paste Firing to Achieve High Fill Factors on Screen- Printed Silicon Solar Cells with a 100 Ω/sq. Emitter

Self-aligned selective-emitter cells have been fabricated using a self-doping paste by co-firing the front and back contacts. Good ohmic contacts with ~0.774 fill factor were obtained on 100 Ω/sq. emitters after alloying the self-doping Ag grid by a 900°C spike firing in a belt furnace. Screen-printed selective emitter Fz Si cells gave an efficiency of 16.4%. Selective-emitter cells with effect...

متن کامل

Effect of firing temperature on the properties of inorganic high temperature phosphate adhesive

High-temperature adhesives are considered for high-temperature applications such as the refractory industry. In this research, inorganic high-temperature phosphate-based adhesive was prepared using alumina and micro silica as the main raw materials and monoaluminum phosphate as a binder. The effect of firing temperature on the properties of the adhesive including phases, microstructure, compres...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Current Biology

دوره 19  شماره 

صفحات  -

تاریخ انتشار 2009