2023年震情述评     

韩颜颜  臧阳  马亚伟  解孟雨  王月  杨文  张小涛  宋金  姜祥华  史海霞  李飞  孟令媛 《中国地震》2024,40(1):271-278

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Scale-dependent effects of nutrient loads and climatic conditions on benthic and pelagic communities in the Gulf of Finland     

Arno Põllumäe  Jonne Kotta  & Ülle Leisk 《Marine Ecology》2009,30(S1):20-32

Eutrophication and climate change are ranked among the most serious threats to the stability of marine ecosystems worldwide. The effects of nutrient loads and climatic conditions vary in direction, magnitude and spatial extent. To date the factors that are behind the scale-specific spatial and temporal variability are poorly known. In this study we assessed how variability in nutrient loads and climatic conditions at local, gulf and regional scales explained the spatial patterns and temporal trends of zooplankton and benthic invertebrates in the Gulf of Finland. In general both local and gulf scale environmental variability had an important effect on benthic invertebrate species and the variability was mainly due to local nutrient loading, gulf scale temperature and salinity patterns. Zooplankton species were equally affected by environmental variability at all spatial scales, and all nutrient load and climatic condition variables contributed to the models. The combination of variables at all spatial scales did not explain the substantially larger proportion in invertebrate variability than variables at any individual scale. This suggests that large-scale pressures such as nutrient loads and change of climatic conditions may define broad patterns of distribution but within these patterns small-scale environmental variability significantly modifies the response of communities to these large-scale pressures.  相似文献   

Comparison of benthic and pelagic suspension feeding in shallow water habitats of the Northeastern Baltic Sea   总被引：1，自引：0，他引：1  

Velda Lauringson  Jonne Kotta  Helen Orav-Kotta  Ilmar Kotta  Kristjan Herkül  & Arno Põllumäe 《Marine Ecology》2009,30(S1):43-55

Combining field experiments with the biomass distribution data of dominant suspension feeders we compared the benthic and pelagic suspension feeding rates in shallow non-tidal brackish water coastal habitats. We found that pelagic grazing exceeded benthic grazing in almost all cases, on average from 14 to 4819 times depending on the site. Benthic grazing rates were related to site-specific environmental parameters and showed no relationship with water chlorophyl a (Chl a ) content, whereas pelagic grazing rates varied both spatially and temporally and were related to water Chl a content. Our results indicate that in several shallow coastal habitats, pelagic suspension feeding substantially exceeds benthic suspension feeding. This suggests that pelagic recycling is higher than the amounts of energy redirected from pelagic to benthic food webs by benthic suspension feeders. These results increase our knowledge of the energy flows in coastal ecosystems.  相似文献   

A project of sustainable utilization of forest resources supported by GIS     

ZANG Shu-ying 《中国地理科学(英文版)》2000,10(2):188-192

lINThODUCnoNResourcesarethefoundationofeconomicdevel-opment,andsustainabledevelopmentistheinevitabletrendofhumandevelopment.Thesustainabedevel-opmentofChineseforestryisanimPOrtantPOrtionofChinesesustainabledevelopmentstrategy,andforestresourceisthekeyproblemofsustaialleforestryde-velopment.Therefore,exploringthereasonableforestresourcemanagementandutilizationprojecthasimpor-tantsignificancefortherealizationofsustainableforestrydevelopment-DaHingganMountainsforestdistrictisoneoftheimPOrt…  相似文献   

Effects of temperature and dissolved oxygen content on oxygen consumption rate of Chinese prawn, giant tiger prawn and giant freshwater prawn     

戴习林  臧维玲  王为东  施永海  刘文翠  徐桂荣  李士华 《中国海洋湖沼学报》1999,17(2):119-124

INTRODUCnON-WatertemperatheanddissolvedoxygenareimportantenvironmentalfactorsinthegmwthanddevelOPmntofaqUaticorgAnsms.ThereareInanPublishedstUdiesontheox-.ygenconsUInPtionrate(OCR)oftheprawn')(WangJim,l986;WangDanghenetal-,199l;ZangWeilingetal-,l992,l993),buttheydidnotcontalndetailedinfonnaionabouttheeffectoftemPerabeontheOCR-ThePresentstudydetendnedtheOCRofju-venilesofChineseprawn,gianttiserprawnandgiantfreshwaterprawnthatwererearedatdifferenttemperatllresforaboutaweekattheCaoj…  相似文献