首页
登录
职称英语
Often conjuring images of dank, smelly, mosquito-infested wastelands, upon cl
Often conjuring images of dank, smelly, mosquito-infested wastelands, upon cl
游客
2023-12-26
6
管理
问题
Often conjuring images of dank, smelly, mosquito-infested wastelands, upon closer look, wetlands are actually biologically diverse and productive ecosystems. Home to a variety of plant life, including floating pond lilies, cattails, cypress, tamarack, and blue spruce, wetlands support diverse communities of invertebrates, which in turn support a wide variety of birds and other vertebrates. Primary consumers from crustaceans, mollusks, and aquatic insect larvae to muskrats, geese, and deer rely on the abundance of algae, plants, and detritus for food. Wetlands also support a variety of carnivores, including dragonflies, otters, alligators, and osprey. Thus, wetlands of the world maintain biologically diverse communities of ecological and economic value.
Many ecologically and economically important species call wetlands home for at least part of their lives. For instance, commercially important fish and shellfish, including shrimp, blue crab, oysters, salmon, trout, and seatrout rely on, or are associated with, wetlands. Wetlands are also critical habitat for migratory birds and waterfowl, including ducks, egrets, and geese. In fact, more than one-third of the species listed as threatened or endangered in the United States live solely in wetlands and nearly half use wetlands at some point in their lives. As such, many wetlands are often recognized as important conservation or restoration targets.
While covering only six percent of the Earth’s surface, wetlands provide a disproportionately high number of ecosystem services, in addition to maintaining biodiversity. For instance, wetlands also mitigate floods, protect coastal areas from storms, improve water quality, recharge groundwater aquifers, serve as sinks, sources, or transformers of materials, and produce food and goods for human use. When evaluating the economic value of these various functions, scientists concluded that the economic value provided by wetland ecosystems exceeded that provided by lakes, streams, forests, and grasslands and was second only to that provided by coastal estuaries.
With mitigation, wetlands are created, restored, or enhanced to replace wetland loss due to development. The Ramsar Convention, an international treaty aimed at conserving wetlands, requires member countries to develop national wetland policies, to establish wetland reserves, and to designate one or more wetlands as an area of international importance. All these efforts are designed to protect or conserve wetlands and the ecosystem services they provide.
In coastal wetlands, tidal influence drives the movement and distribution of water and can range from permanent flooding in subtidal wetlands to less frequent flooding in others, with changes in water level occurring daily or semi-daily. Inland wetlands, which lack daily tidal influences, can also be permanently flooded on one extreme or intermittently flooded on the other extreme, with fluctuations over time often occurring seasonally. It is the balance of water inflows and outflows, or the water budget, as well as the geomorphology and soils that determine the timing, duration, and patterns of flooding in a wetland. [br] A dragonfly is a carnivore because its menu includes______.
选项
A、insects
B、cattails
C、muskrats
D、seatrouts
答案
A
解析
常识题。carnivore是指食肉动物、食虫动物。通过常识判断蜻蜓是以昆虫为食。故选A。
转载请注明原文地址:https://tihaiku.com/zcyy/3306208.html
相关试题推荐
ThisisthefirsttimeFDAofficialshavetriedtoaddgraphicimagestotobacco
Oftenconjuringimagesofdank,smelly,mosquito-infestedwastelands,uponcl
Oftenconjuringimagesofdank,smelly,mosquito-infestedwastelands,uponcl
Oftenconjuringimagesofdank,smelly,mosquito-infestedwastelands,uponcl
Oftenconjuringimagesofdank,smelly,mosquito-infestedwastelands,uponcl
Oftenconjuringimagesofdank,smelly,mosquito-infestedwastelands,uponcl
Oftenconjuringimagesofdank,smelly,mosquito-infestedwastelands,uponc
Oftenconjuringimagesofdank,smelly,mosquito-infestedwastelands,uponc
Oftenconjuringimagesofdank,smelly,mosquito-infestedwastelands,uponc
Oftenconjuringimagesofdank,smelly,mosquito-infestedwastelands,uponc
随机试题
[originaltext]WhenpeterandRosecametotheUnitedStatesfromthePhilip
Oneofthe【C1】______beautifulsightsinthebirdworldisthemalepeafowl
CholesterolandHeartDiseaseDoyouknowyourcholest
Theworldisnotonlyhungry,but【B1】______forwater.Thatwayseemsstrange
某公司采用WindowsServer2003操作系统搭建该公司的企业网站,要
关于常规胸椎侧位摄影的叙述,错误的是A.清晰显示第1~12胸椎形态 B.患者侧
三腔气囊管使用注意事项中,下列哪项不妥()A.拔管前宜服石蜡油 B.
下列有关应收票据审计的表述中,正确的是( )。A.应收票据与应收账款的审计方法
企业承担社会责任对企业的有利作用包括()。A.增强顾客忠诚度 B.增强
龋均指受检查人群中每人口腔中平均A.患龋已充填的牙数 B.患龋尚未填充的牙
最新回复
(
0
)