The present investigation is conducted to study the year wise (2011to 2018) changes of water hyacinth (Eichhornia crassipes) cover atSantragachi Lake a Wetland under National Wetland ConservationProgramme of India. Fu...The present investigation is conducted to study the year wise (2011to 2018) changes of water hyacinth (Eichhornia crassipes) cover atSantragachi Lake a Wetland under National Wetland ConservationProgramme of India. Further the relationship between water hyacinthcover and the most abundant migratory waterbirds of Satragachi, LesserWhistling Teal (LWT;Dendrocygna javanica) is assessed because this birdspecies is prefer depending on water hyacinth mat for their roosting. Thestudy comprises of eight satellite images procured from Google earth (2011to 2018) to explore this relationship. A marked decline in the number ofLWT at Santragachi wetland is observed in the year of 2017 and 2018. Itis very interesting fact that from 2017-2018, the water hyacinth mat of thiswetland is almost cleared before winter and the result of cluster analysissupports this fact. Significant positive correlation is also observed withinLWT number and water hyacinth cover area (r = 0.7481 at p< 0.05) alongwith the total perimeter (r = 0.8648 at p< 0.05) of the water hyacinthislands at Santragachi wetland. However, open water area is also neededfor diving, swimming, food searching for the LWT and other waterbirds.Therefore, more study is needed to optimize the clearing operations,focused on optimizing the shape and size of water hyacinth islands forproper management of the waterbirds habitat.展开更多
随着美国计算机科学教育课程体系和课程评价标准的完善,对计算机科学教师的培训成为制约当今美国计算机科学教育发展的一大难题。为此,美国各州政府、组织和科技公司纷纷推出教师培训计划和项目,其中微软慈善组织支持的学校技术教育和素...随着美国计算机科学教育课程体系和课程评价标准的完善,对计算机科学教师的培训成为制约当今美国计算机科学教育发展的一大难题。为此,美国各州政府、组织和科技公司纷纷推出教师培训计划和项目,其中微软慈善组织支持的学校技术教育和素养(Technology Education and Literacy in Schools,TEALS)项目,创造性地通过计算机科学行业志愿者和教师合作教学的方式,为美国高中开设可持续的计算机科学课程,同时为计算机科学教师的专业发展和培训开创了新的模式。展开更多
文摘The present investigation is conducted to study the year wise (2011to 2018) changes of water hyacinth (Eichhornia crassipes) cover atSantragachi Lake a Wetland under National Wetland ConservationProgramme of India. Further the relationship between water hyacinthcover and the most abundant migratory waterbirds of Satragachi, LesserWhistling Teal (LWT;Dendrocygna javanica) is assessed because this birdspecies is prefer depending on water hyacinth mat for their roosting. Thestudy comprises of eight satellite images procured from Google earth (2011to 2018) to explore this relationship. A marked decline in the number ofLWT at Santragachi wetland is observed in the year of 2017 and 2018. Itis very interesting fact that from 2017-2018, the water hyacinth mat of thiswetland is almost cleared before winter and the result of cluster analysissupports this fact. Significant positive correlation is also observed withinLWT number and water hyacinth cover area (r = 0.7481 at p< 0.05) alongwith the total perimeter (r = 0.8648 at p< 0.05) of the water hyacinthislands at Santragachi wetland. However, open water area is also neededfor diving, swimming, food searching for the LWT and other waterbirds.Therefore, more study is needed to optimize the clearing operations,focused on optimizing the shape and size of water hyacinth islands forproper management of the waterbirds habitat.
文摘随着美国计算机科学教育课程体系和课程评价标准的完善,对计算机科学教师的培训成为制约当今美国计算机科学教育发展的一大难题。为此,美国各州政府、组织和科技公司纷纷推出教师培训计划和项目,其中微软慈善组织支持的学校技术教育和素养(Technology Education and Literacy in Schools,TEALS)项目,创造性地通过计算机科学行业志愿者和教师合作教学的方式,为美国高中开设可持续的计算机科学课程,同时为计算机科学教师的专业发展和培训开创了新的模式。
