نتایج جستجو برای: the less bycatch and bycatch

تعداد نتایج: 21152037  

2015
Robin B. Thomson Rachael L. Alderman Geoffrey N. Tuck Alistair J. Hobday Yan Ropert-Coudert

The impacts of climate change on marine species are often compounded by other stressors that make direct attribution and prediction difficult. Shy albatrosses (Thalassarche cauta) breeding on Albatross Island, Tasmania, show an unusually restricted foraging range, allowing easier discrimination between the influence of non-climate stressors (fisheries bycatch) and environmental variation. Local...

2014
Eric Gilman Milani Chaloupka Brett Wiedoff Jeremy Willson

Bycatch in longline fisheries threatens the viability of some seabird populations. The Hawaii longline swordfish fishery reduced seabird captures by an order of magnitude primarily through mitigating bycatch during setting. Now, 75% of captures occur during hauling. We fit observer data to a generalized additive regression model with mixed effects to determine the significance of the effect of ...

2009
Jiangfeng Zhu Liuxiong Xu Xiaojie Dai Xinjun Chen Yong Chen

S Pelagic deep longline was widely used in targeting tunas of high economic values with other fish species caught incidentally as bycatch. Identifying characteristics of vertical distribution of fish species that interact with longline can provide critical information needed for the development of effective measures to mitigate bycatch species and is essential for ecosystem conservation. Much w...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت معلم تهران - دانشکده علوم 1370

determination of uranium in natural water and complex solutions using ion exchange chromatography: a combined procedure using ion exchange chromatography and uv-vis spectrophotometry techniques has been developed to measure uranum in natural water and complex solutions. after conditicing , one hundred milli liters of sample solutions have been passed through an ion exchange column,pachked with ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد 1388

two groups of students were assigned as experimental and control ones, and were given instruction on directed reading-thinking activities and after some treatment, they were post-tested. although the initial pre-test did not show any significant differences, the final post-test result revealed that the cooperative reading comprehension helped the experimental group. the cooperative students’...

2007
Chris Wilcox Josh Donlan

© The Ecological Society of America www.frontiersinecology.org G fisheries provide approximately 16% of all protein consumed by humans, employ about 200 million people, and are valued at US$82 billion (Botsford et al. 1997; FAO Fisheries Department 2004). Eight percent, or 7.2 million tons, of the global catch is comprised of non-target species and discarded, and this mortality is having major ...

2004
Ali Ross Stephen Isaac

The incidental capture, or bycatch, of non-target species such as mammals, birds, turtles, fish and other marine species in fisheries is recognised to be a major problem in many parts of the world. It has been estimated that 23% of the global fisheries catch is thrown back into the sea dead and wasted. Globally, the toll on all cetaceans (whales, dolphins and porpoises) is estimated to exceed 3...

2013
Eric Gilman Milani Chaloupka Brett Wiedoff Jeremy Willson

Bycatch in longline fisheries threatens the viability of some seabird populations. The Hawaii longline swordfish fishery reduced seabird captures by an order of magnitude primarily through mitigating bycatch during setting. Now, 75% of captures occur during hauling. We fit observer data to a generalized additive regression model with mixed effects to determine the significance of the effect of ...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید