科研之友
微信
新浪微博
Facebook
分享链接
摘要
AIM: Veredas and the aquatic and semi-aquatic communities play a key role in watershed protection in the Cerrado Biome. Information about the effects of physical and chemical variables and habitat integrity on benthic communities has been increased in recent years; however, there is no study evaluating the influence of urbanization on macroinvertebrates of Vereda streams. Thus, improving the knowledge of the relationship between abiotic properties and benthic fauna is very important for understanding the functioning of ecological processes and health of aquatic ecosystems. This study investigated the influence of physical and chemical variables on benthic macroinvertebrate communities along a gradient of anthropogenic disturbance in four Vereda streams in Uberlandia (MG), one in a preserved area and three in the urban area; METHODS: samplings were collected during the dry and rainy seasons; RESULTS: principal component analysis separated the stream in the preserved area from those in the urban area by having lower values of BOD, COD, sediment size, conductivity, detergents, pH, deposited solids and total dissolved solids. Pollution sensitive groups (e.g., Ephemeroptera and Trichoptera) were associated to the stream in the preserved area, and more tolerant groups (e.g., Chironomidae and Oligochaeta) had greater abundance in the streams of the urban area. Canonical Correspondence Analysis indicated that dissolved oxygen, conductivity, BOD, oil and grease, and turbidity explained 56% of the variance in the distribution and abundance of macroinvertebrates; CONCLUSIONS: Benthic communities of Vereda streams in urban areas in the Cerrado Biome seem to be highly affected by human activities that increase water organic pollution and sedimentation. OBJETIVO: Veredas e comunidades aqu芍ticas e semi-aqu芍ticas desempenham importante papel na prote o das bacias hidrogr芍ficas no Bioma Cerrado. Informa es sobre efeitos de vari芍veis f赤sico-qu赤micas e da integridade do habitat nas comunidades de macroinvertebrados bent nicos t那m aumentado nos anos recentes, entretanto, n o h芍 estudos avaliando a influ那ncia da urbaniza o nas comunidades de macroinvertebrados em c車rregos de veredas. Assim, ampliar o conhecimento da rela o entre as vari芍veis abi車ticas e fauna bent nica 谷 muito importante para a compreens o do funcionamento dos processos ecol車gicos e da integridade dos ecossistemas aqu芍ticos. Este estudo investigou a influ那ncia de vari芍veis f赤sicas e qu赤micas nas comunidades de macroinvertebrados bent nicos ao longo de um gradiente de dist迆rbios antr車picos em quatro c車rre
