scholarly journals Habitat diversity and benthic functional trophic groups at Serra do Cipó, Southeast Brazil

2001 ◽  
Vol 61 (2) ◽  
pp. 259-266 ◽  
Author(s):  
M. CALLISTO ◽  
P. MORENO ◽  
F. A. R. BARBOSA
Keyword(s):  
Riparian Vegetation ◽  
Aquatic Macrophytes ◽  
Mesh Size ◽  
Habitat Diversity ◽  
Trophic Groups ◽  
Macroinvertebrate Communities ◽  
Lotic Ecosystems ◽  
Serra Do Cipó ◽  
Trophic Resources ◽  
Doce River

The assessment of the diversity of habitats and the characterisation of the functional trophic groups of benthic macroinvertebrate communities of some rivers of Serra do Cipó (MG) were the main objectives of this study. The available trophic resources and the types of substrata were characterised along with the structure and composition of their using functional trophic groups. Serra do Cipó is a watershed divisor of the São Francisco and Doce River basins, including a series of streams and rivers, of good water quality and well preserved ecological characteristics. Samples were collected in Cipó, Peixe and Preto do Itambé rivers, besides the Indaiá and Capão da Mata streams at 26 sampling stations, during the rainy (February) and dry (October) seasons of 1998, using "Kicking nets" of 0.125 mm mesh size. The group of collectors (Baetidae, Leptophlebiidae and Leptohyphidae) was the most abundant, followed by collector-predators (Hydrophilidae, Ceratopogonidae, Chironomidae-Tanypodinae), and detritivorous-herbivores (Oligochaeta). The riparian vegetation, together with the aquatic macrophytes, are the substrata containing the highest richness of functional trophic groups and the higher habitat diversity. The results suggest that the use of functional trophic groups, together with habitat evaluation, are efficient tools in the evaluation of the diversity of benthic macroinvertebrates, particularly in altitudinal lotic ecosystems.

scholarly journals Biodiversity assessment of benthic macroinvertebrates in altitudinal lotic ecosystems of Serra do Cipó (MG, Brazil)

2001 ◽  
Vol 61 (2) ◽  
pp. 239-248 ◽  
Author(s):  
N. GALDEAN ◽  
M. CALLISTO ◽  
F. A. R. BARBOSA
Keyword(s):  
Organic Matter ◽  
Benthic Macroinvertebrates ◽  
Aquatic Macrophytes ◽  
Filamentous Algae ◽  
Biodiversity Assessment ◽  
Aquatic Communities ◽  
Lotic Ecosystems ◽  
Serra Do Cipó ◽  
Trophic Resources ◽  
Taxonomic Groups

Five lotic systems of Serra do Cipó, south-east Brazil, were investigated in order to assess the existing diversity of benthic macroinvertebrates, habitats-microhabitats, and the available trophic resources. For each river it was analysed the communities of benthic macroinvertebrates and the composition of some taxonomic groups (Plecoptera, Ephemeroptera, Trichoptera and Diptera Chironomidae): the community with Bivalvia Sphaeriidae, Oligochaeta and Ephemeroptera Baetidae (being supposed a closed relation Bivalvia-Oligochaeta based on the process of bioturbation and enrichment of sediment in organic matter) in Tanque River; the macrofauna associated to aquatic macrophytes from rivers Peixe and Preto do Itambé reflecting the reaction of the ecosystems versus the quantities of nutrients which originate from the farmlands; the lithoreophilic communities of Cipó River; the community depending on deposits of leaves and filamentous algae in Congonhas Stream; the very rich community of the moss clumps in the Indaiá Stream. A proposal for biological zonation of Cipó River and some comments about the importance of the analysed benthic macroinvertebrates in the biological production of the aquatic communities were done.

scholarly journals Mayfly diversity in the brazilian tropical headwaters of Serra do Cipó

2005 ◽  
Vol 48 (6) ◽  
pp. 983-996 ◽  
Author(s):  
Michael Goulart ◽  
Marcos Callisto
Keyword(s):  
Taxonomic Richness ◽  
Dry Period ◽  
Lotic Ecosystems ◽  
River Watershed ◽  
Rainy Period ◽  
Sao Francisco River ◽  
Serra Do Cipó ◽  
São Francisco River ◽  
Dry Seasons ◽  
Doce River

The objectives of this study were to evaluate spatial and seasonal distribution, assemblage structure and substrate associations of mayfly nymphs in five lotic ecosystems in the headwaters of the Doce River and São Francisco River watersheds, Brazil. Samples were taken in 24 sampling stations during rainy and dry seasons in 1998. In total, 7,066 organisms were collected, belonging to 27 genera and 6 families of Ephemeroptera. The dominant taxa were Americabaetis, Paracloeodes, Leptohyphes and Hagenulus. During the rainy period, the São Francisco River watershed showed higher taxonomic richness, diversity and evenness, while in the dry period, the taxonomic richness was higher in Doce River watershed. No significant differences were found in the taxonomic richness, diversity, evenness and density of mayfly assemblages between the two studied sampling periods. The results suggested that the diversity of the mayfly assemblages in tropical headwaters of Serra do Cipó would be probably due to ecosystem and watershed characteristics.

scholarly journals Diversity and distribution of diatoms in Bagmati River, Kathmandu, Nepal

2018 ◽  
Vol 6 ◽  
pp. 6-15
Author(s):  
Shiva Kumar Rai ◽  
Sudip Khadka
Keyword(s):  
Aquatic Macrophytes ◽  
Habitat Diversity ◽  
Diatom Cell ◽  
Different Seasons ◽  
Bagmati River

Diversity and distribution of diatoms in different seasons from different localities and habitats of Bagmati River, Kathmandu was studied. Samples were collected as epilithic forms using a toothbrush, epipelic forms using a dropper, and epiphytic forms by squeezing aquatic macrophytes and were preserved in FAA solution. The dominant diatom taxa of Bagmati river were Achnanthes crenulata, Gomphonema pseudoaugur, Nitzschia linearis, N. palea, Pinnularia cf divergens and Surirella linearis. Out of 48 taxa reported, maximum taxa (87.5%) were found at Mulkharka site whereas taxa were minimum (39.58%) at Pashupati-Guheshwori site. The sizes of diatom cell, from largest to smallest, also followed the same pattern as above. Ten diatom taxa were common in all three sites. Seasonal and habitat diversity of diatom studied in Mulkharka site showed that the maximum number of taxa was reported during summer (92.85%) and least during winter (23.8%), and maximum taxa were found as epilithic (85.71%) followed by epipelic (38.09%) and epiphytic (33.33%).

scholarly journals Longitudinal dimensions of land-use impacts in riverine ecosystems

2019 ◽  
Vol 31 ◽  
Author(s):  
Rafael Feijó-Lima ◽  
Eugenia Zandonà ◽  
Bruna Suelen da Silva ◽  
Flavia Tromboni ◽  
Timothy Peter Moulton ◽  
...  
Keyword(s):  
Riparian Vegetation ◽  
Riparian Forest ◽  
Atlantic Rainforest ◽  
Fragmented Landscape ◽  
Macroinvertebrate Communities ◽  
Buffer Strips ◽  
Land Use Impacts ◽  
Stream Flows ◽  
Riverine Ecosystems ◽  
Forest Remnants

Abstract: Aim Rivers are linked longitudinally via the flow of water and the spatial dimensions of the changes in local riparian vegetation are still poorly understood. Recent modifications to the Native Vegetation Protection Law allow reduction of lateral buffer strips and amnesty for riparian vegetation removal, which might increase the fragmentation of native riparian vegetation, especially for Atlantic Rainforest streams. Methods We present two case studies conducted in a stream draining a fragmented landscape in the Atlantic Rainforest. The stream flows through two abrupt transitions (forest-pasture-forest) and we investigated how far the upstream effects of a given riparian condition could be detected in the downstream reach for a suite of variables. Results We show that the effects of land cover propagate downstream for both algal and macroinvertebrate communities. For some variables of interest, these effects might extend up to a km downstream from the transition. Conclusions There is a need to understand how the distribution of riparian forest remnants contribute to maintaining watershed-scale resilience to impacts.

Komposisi Tumbuhan Air dan Tumbuhan Riparian di Danau Sentani, Provinsi Papua

2017 ◽  
Vol 2 (2) ◽  
pp. 33
Author(s):  
I Gusti Ayu Agung Pradnya Paramitha ◽  
Riky Kurniawan
Keyword(s):  
Aquatic Ecosystems ◽  
Riparian Vegetation ◽  
Aquatic Macrophytes ◽  
Abundant Species ◽  
Imperata Cylindrica ◽  
Survey Method ◽  
Riparian Zones ◽  
Ceratophyllum Demersum ◽  
Transect Line ◽  
The Status

<strong>Composition of Aquatic Macrophytes and Riparian Vegetation in Lake Sentani, Papua Province.</strong> Macrophytes and riparian vegetation play an important role in maintaining the balance of aquatic ecosystems. The loss of vegetation components can lead to increased sedimentation and change the microhabitat in the waters. This research aimed to obtain the composition of aquatic macrophytes and riparian vegetation in Lake Sentani, as well as to determine the status of waters and the characteristics of riparian zones in Sentani Lake. The research was conducted from September to October 2014. The sampling of aquatic macrophytes and riparian vegetation was conducted at 5 stations: St.1 (Doyo Lama), St.2 (Donday), St.3 (Deyau), St.4 (Kalkotte), and St. 5 (Jaifuri). Data of aquatic macrophytes was taken using square plot (1 x 1 m2) of 15 plots, while riparian vegetation data used survey method with 10 m transect line from the shoreline. The results showed that there were 10 species of aquatic macrophytes from 8 families and 30 species of riparian vegetation from 18 families. Based on these aquatic macrophytes and riparian vegetation, Lake Sentani is categorized as eutrophic, with the dominant macrophyte being hornworts (Ceratophyllum demersum L.; 135 individuals). Station 4 (Kalkotte) has the largest number of individual aquatic macrophytes (96 individuals). Cogongrass (Imperata cylindrica (L.) Beauv.) was found to be the most abundant species of riparian vegetation in all stations (190 individuals). This is related to the shoreline of Lake Sentani which is largely a sandy soil. Station 5 (Jaifuri) has the largest number of species and the largest number of individual riparian vegetation (344 individuals from 20 species). <br />

scholarly journals Relating trophic resources to community structure: a predictive index of food availability

2017 ◽  
Vol 4 (2) ◽  
pp. 160515 ◽  
Author(s):  
Valerio Zupo ◽  
Timothy J. Alexander ◽  
Graham J. Edgar
Keyword(s):  
Trophic Group ◽  
Food Abundance ◽  
Trophic Groups ◽  
Predictive Index ◽  
Food Items ◽  
Natural Factors ◽  
Trophic Resources ◽  
Ecological Theories ◽  
Resource Conditions ◽  
Natural Communities

The abundance and the distribution of trophic resources available for consumers influence the productivity and the diversity of natural communities. Nevertheless, assessment of the actual abundance of food items available for individual trophic groups has been constrained by differences in methods and metrics used by various authors. Here we develop an index of food abundance, the framework of which can be adapted for different ecosystems. The relative available food index (RAFI) is computed by considering standard resource conditions of a habitat and the influence of various generalized anthropogenic and natural factors. RAFI was developed using published literature on food abundance and validated by comparison of predictions versus observed trophic resources across various marine sites. RAFI tables here proposed can be applied to a range of marine ecosystems for predictions of the potential abundance of food available for each trophic group, hence permitting exploration of ecological theories by focusing on the deviation from the observed to the expected.

scholarly journals Resilience of riparian vegetation composition and diversity following cessation of livestock grazing in northeastern Oregon, USA

2021 ◽  
Author(s):  
J Boone Kauffman ◽  
Greg Coleman ◽  
Nick Otting ◽  
Robert L Beschta ◽  
Danna Lytjen ◽  
...  
Keyword(s):  
Riparian Vegetation ◽  
Poa Pratensis ◽  
Habitat Diversity ◽  
Livestock Grazing ◽  
Riparian Ecosystems ◽  
Vegetation Composition ◽  
Sediment Retention ◽  
Positive Feedbacks ◽  
Stream Morphology ◽  
Climate Change Effects

Riparian ecosystem restoration has been accomplished through exclusion of livestock using  corridor fencing along hundreds of kilometers of streams in the western USA, for the benefit of riparian-obligate wildlife and endangered fishes.  Yet few studies have evaluated shifts in the vegetation composition and diversity following the cessation of livestock impacts.  We sampled riparian vegetation composition along 11-paired grazed and ungrazed (exclosed) stream reaches in northeastern Oregon, USA.  Exclosure ages ranged from 2 to >30 years and grazing treatments varied from light grazing every one out of three years to heavy season-long grazing.  Species richness and diversity was higher in the ungrazed  reaches (p =0.002). The abundance of native sedges ( Carex spp.) and broad-leaved forbs were also significantly (p < 0.05) greater in ungrazed areas. In contrast, exotic species adapted to grazing such as Poa pratensis and Trifolium repens were more abundant in grazed stream reaches.  The prevalence of hydrophytic species significantly increased (p ≤ 0.01) in ungrazed reaches, (based on wetland species  indicator scores), indicating that wetland-dominated communities within the ungrazed stream reaches were replacing ones adapted to drier environments.   The increased abundance of facultative and wetland-obligate species in ungrazed reaches compared to grazed reaches suggests that livestock grazing exacerbates those climate change effects also leading to warmer and drier conditions. Further, riparian-obligate shrub cover along the streambank was higher in 7 of 8 exclosures that were older than 5 years. As a restoration approach the inherent resilience of  riparian ecosystems exhibited in ungrazed riparian zones suggest positive feedbacks to other beneficial ecosystem processes such as increased species and habitat diversity, increased carbon sequestration, enhanced allochthonous inputs and greater sediment retention, that would affect the aquatic and terrestrial biota, water quality, and stream morphology.

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