Melano-macrophage centres in whitemouth croaker, Micropogonius furnieri, as biological indicators of environmental changes

1992 ◽  
Vol 40 (6) ◽  
pp. 971-973 ◽  
Author(s):  
G. J. Macchi ◽  
L. A. Romano ◽  
H. E. Christiansen
Keyword(s):  
Environmental Changes ◽  
Biological Indicators

scholarly journals A medium-spatial scale distribution pattern of Pseudoscorpionida (Arachnida) in a gradient of topography (altitude and inclination), soil factors, and litter in a central Amazonia forest reserve, Brazil

2006 ◽  
Vol 66 (3) ◽  
pp. 791-802 ◽  
Author(s):  
N. O. Aguiar ◽  
T. L. Gualberto ◽  
E. Franklin
Keyword(s):  
Spatial Scale ◽  
Environmental Changes ◽  
Biological Indicators ◽  
Predictor Variables ◽  
Generalist Predators ◽  
Soil Factors ◽  
Abundance And Diversity ◽  
The Stability ◽  
Clay Percentage ◽  
Trail System

In Amazonia, nothing is known about the distribution of the invertebrates on a medium-spatial scale pattern. In a trail system of 64 km² at Ducke Reserve, we sampled 72 transects using the hand-sorting method and Berlese-Tullgren extraction. The reserve possesses ecosystems of "terra-firme" forest and the trail system represents a gradient of topographic soil factors and vegetation, avoiding categorizations. Considering the abundance and diversity of Pseudoscorpionida, we investigated the relation of the community to environmental factors tested (topography, clay percentage, litter, and soil pH), to the two major drainage basins of the reserve, and if these invertebrates can be used as biological indicators to monitor changes. We registered two species for the first time in the reserve, increasing the known diversity to 17 species. The lack of correlation with the predictor variables and the large home range, indicate that pseudoscorpions are not good biological indicators in the reserve. As the eastern and western watersheds are not separate management units for the community, our results show that they are generalist predators. In spite of our results and lack of knowledge concerning their biology, life history and taxonomy, pseudoscorpions are cosmopolitan and easy to find and measure. Compared with previous studies in the reserve, they have a consistent pattern of abundance and diversity throughout the years showing the stability of the community which can be checked mainly by comparison with environmental changes that would occur in the reserve. An investigation on a medium-spatial scale pattern and over a long-term period including other habitats, and also other predictor variables, like humidity, the structure of the vegetation and canopy closure, will be necessary to reinforce the observed tendencies.

scholarly journals A fauna de peixes nas bacias do norte do Espírito Santo, Brasil

2012 ◽  
Vol 12 (1) ◽  
pp. 27 ◽  
Author(s):  
Luisa Maria Sarmento-Soares ◽  
Ronaldo Fernando Martins-Pinheiro
Keyword(s):  
Environmental Changes ◽  
Sand Dunes ◽  
Fish Fauna ◽  
Distribution Patterns ◽  
Biological Indicators ◽  
Taxonomic Composition ◽  
Semiarid Region ◽  
Freshwater Species ◽  
Espírito Santo ◽  
Espirito Santo

The hydrographic basins of northern Espírito Santo comprises the systems of Itaúnas and São Mateus rivers. The present work is part of a series of studies on the fish fauna along Espírito Santo’s river basins. Forty-nine geo-referred points in rivers and rivulets of the area were evaluated, 20 in the Itaúnas basin and 28 in São Mateus basin. The environment and the taxonomic composition of the fish fauna were documented at every point, reporting a total of 83 species, including 47 freshwater species and 36 marine, belonging to 35 families and 11 orders. Among the freshwater fish species, the Siluriformes predominated, with 20 species, followed by the Characiformes, with 17 species. The Atlantic forest of northern Espírito Santo, known as “floresta de tabuleiros”, was originally composed of ombrophylous forest as well as swamps, coastal sand dunes, and mangroves. With the suppression of native forests, the region has suffered from desertification, and environmental conditions are similar to the northeastern semiarid region, where the run-off waters are dispersed or intermittent. The loss of environmental quality along river valleys is associated with the need to reestablish riverine aquatic conditions. Exotic species and risks of introductions need further studies in these areas. Rare or endangered species whose distributional range has diminished in response to environmental changes may function as biological indicators. Potentially new species are identified, and regional endemism and distribution patterns for freshwater fishes are discussed.

scholarly journals Seasonal dynamics of waterbirds from a relict wetland in the central Monte Desert, Argentina

2021 ◽  
Vol 16 (2) ◽  
pp. 333-349
Author(s):  
Ever Tallei ◽  
Analía Benavidez ◽  
Alejandro Schaaf ◽  
Pablo Isola ◽  
Marcelo Zanotti
Keyword(s):  
Environmental Changes ◽  
Integrated Management ◽  
Limited Resource ◽  
Taxonomic Diversity ◽  
Biological Indicators ◽  
Community Diversity ◽  
Monte Desert ◽  
Management Plans ◽  
Waterbird Assemblages ◽  
Diversity Profiles

Wetlands currently have high rates of degradation, with more than 70% lost globally. In the central Monte Desert, Argentina, they are a scarce and limited resource for the biodiversity which depends on them. Waterbirds have been used as biological indicators of wetlands because they respond to fluctuations in food resources and to environmental changes in the short term. Here we analyse the seasonal variations in the structure of the waterbird assemblage from a relict wetland in this region. We carried out censuses of waterbirds in a 6-year period (between 2009 and 2019) during the southern summer and winter. We recorded 1875 individuals of 33 species of waterbirds during the summer and 677 individuals of 29 species during the winter. The grouping patterns of the waterbird assemblages differed between seasons (R = 0.35; p < 0.01). Taxonomic diversity profiles showed greater diversity for all indexes (qD) during the summer. The guild of invertivorous and omnivorous waders had a greater abundance of individuals during the summer (p < 0.05) and, together with the surface-feeding herbivores, contributed to the 87% of the dissimilarity of the assemblages between seasons. Phoenicopterus chilensis was the only species registered as threatened with national and international extinction. Relict wetlands, such as Laguna del Viborón, still have attributes of community diversity and represent the last refuges for waterbirds of the central Monte Desert. The information gathered in this study will contribute to the guidelines for integrated management plans and monitoring programmes for the conservation of the wetland and its biodiversity.

scholarly journals Frugivorous butterflies (Lepidoptera: Nymphalidae) as a habitat quality indicator in Cerrado urban fragment

2020 ◽  
Vol 13 ◽  
pp. e904
Author(s):  
Ieza Aparecida Teles Porath ◽  
Rodrigo Aranda
Keyword(s):  
Species Richness ◽  
Environmental Changes ◽  
Low Cost ◽  
Biological Indicators ◽  
Environmental Indicator ◽  
Efficient Tool ◽  
Cost Study ◽  
Mato Grosso ◽  
Significant Difference

The environmental monitoring programs used to assess the quality of the habitats are often common to insects, mainly as frugivorous butterflies, as easily accessible biological indicators. These have ample availability of information, an easy to perform and low cost study method, in addition to responding easily to environmental changes, making it an efficient tool in environmental diagnosis. The way or objective of this work was to inventory as frugivorous butterflies in two different points, edge and center of an urban fragment belonging to the Universidade Federal de Rondonópolis, state of Mato Grosso, using as an environmental indicator. As a hypothesis, it was believed to detect differences in species richness, the amount of composition and composition between two areas. A sampling was carried out between the months of February and May 2019, using 10 Van Someren-Rydon weapons, of which six were distributed at the edges and four in the center (interior) of the fragment. Take place as trapped collections once a week lasting three days at each event. 105 individuals belonging to nine species of Nymphalidae were captured, respectively, as subfamilies: Biblidinae (71), Satyrinae (31) and Charaxinae (03). There was no significant difference between species richness, quantity and composition in the edge area and in the center of the fragment.

scholarly journals THE PERFORMANCE OF MACROZOOBENTOS AS A BIOINDICATOR OF WATER QUALITY IN THE LOWER PARTS OF THE HURUN LAMPUNG RIVER

2021 ◽  
Vol 6 (2) ◽  
pp. 72-82
Author(s):  
Vina Triesa Putri ◽  
Nidya Kartini ◽  
Indra Gumay Yudha ◽  
Abdullah Aman Damai
Keyword(s):  
Regression Models ◽  
Environmental Changes ◽  
Diversity Index ◽  
Biological Indicators ◽  
Linear Regression Models ◽  
Community Activities ◽  
Dominance Level ◽  
Physical And Chemical ◽  
Dominance Indices ◽  
Temperature Depth

Macrozoobenthos is one of the organisms that can be used as biological indicators because it tends to live in an area and has sensitivity to environmental changes. The Hurun River had many community activities. Based on this, it was necessary to analyze the diversity of macrozoobenthos which will be compared with the physical and chemical parameters of water in order to find out the indicators that affect the abundance of macrozoobenthos in the river. The purpose of this research was to determine the macrozoobenthic community structure which found in the Hurun River based on diversity, uniformity and dominance indices, to build multiple linear regression models, and to determine the bioindicators of pollution in the Hurun River. The factors that influence the abundance of macrozoobenthos are temperature, depth, brightness, DO, TOM, and salinity. The types of macrozoobenthos obtained were 87 species with the highest abundance of macrozoobenthic animals of 70,666.56 ind/m3 while the lowest abundance of macrozoobenthic animals was 13,000.96 ind/m3. Based on data analysis, the macrozoobenthic diversity index was included in the medium category, the level of macrozoobenthic uniformity was included in the high, medium, and low categories, and the dominance level which was included in the medium and low categories. Multiple regression models with a confidence level of 5% get R2 results of 0.86. The level of pollution that occured in the Hurun River based on bioindicators with the ABC curve shows moderately polluted.

scholarly journals MACROPHYTIC COMMUNITY AS BIOLOGICAL INDICATORS OF POLLUTION IN ANCHAR LAKE OF KASHMIR

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Muzamil Bashir ◽  
Javid Ahmad Malik ◽  
Asma Zaffar ◽  
Mohammad Farooq Mir
Keyword(s):  
Water Level ◽  
Environmental Changes ◽  
Biological Indicators ◽  
Water Level Fluctuation ◽  
Lake Ecosystem ◽  
Level Fluctuation ◽  
Lake Ecosystems ◽  
State Of Water ◽  
Biological Organisms ◽  
Floating Leaf

The most significant biotic constituent in a lake ecosystem is represented by macrophytes in their diverse forms. Macrophytes, because of their capacity to integrate environmental changes over periods of a few years, and reflect the cumulative effects of successive disturbances, are considered excellent indicators of the ecological state of water bodies Macrophytes are by far the most investigated group used for exploring the effects of water level fluctuation on biological organisms in aquatic ecosystems . In lake ecosystems, Overall 31 species of aquatic macrophytes were reported from Anchar Lake with different morphology, which consisted of emergent (14), rooted floating leaf type (08), submerged (06) and free floating (03). The efforts mainly focus on the relationships between water level fluctuation and the presence, species richness, distribution and cover of macrophytes.

Fluctuating Asymmetry as a Measure of Ecological Stress in Rousettus ampexicaudatus (a Fruit Bat), in Bohol, Philippines

2015 ◽  
Vol 13 (1) ◽  
Author(s):  
REIZL P. JOSE ◽  
KAY P. RAMOS ◽  
CRISTINE J. GONZAGA ◽  
SHARON ROSE TABUGO
Keyword(s):  
Fluctuating Asymmetry ◽  
Environmental Changes ◽  
Principal Component ◽  
Biological Indicators ◽  
Biological Species ◽  
Developmental Instability ◽  
Conservation Strategies ◽  
Ecological Stress ◽  
Fruit Bat ◽  
Perfect Symmetry

Bats are biological species that can be influenced by environmental changes. The nature and understanding of the adaptation and survival of bats as biological indicators of the health of the ecosystem is essential for preservation and conservation strategies. Fluctuating asymmetry (FA) are fine and random deviations from perfect symmetry of organism’s morphology. It is considered as a reliable factor for measuring developmental instability because it reflects both genetic and environmental stresses especially in endangered populations. Hypothesis assumes that FA has costs and reflects the degree of stress and quality of individuals herewith, a direct relationship between FA and developmental instability. The study determined the developmental instability via fluctuating asymmetry of Rousettus ampexicaudatus, a fruit bat. Using landmark method for shape asymmetry, anatomical and mathematical landmarks were used and analyzed using Symmetry and Asymmetry in Geometric Data (SAGe) program. Results yield highly significant FA for both populations examined (Tamboco cave & claise cave, Bohol). However, population from claise cave in Nagtuang of loon has relatively higher FA and percentage of variation based on the Principal component Analysis (PcA). Thus, the bat population in claise cave experienced a higher degree of stress. Keywords - Animal Ecology, fluctuating asymmetry, SAGE program, experimentaldesign, Philippines

scholarly journals Biodiversity of nematodes biological indicators of soil quality in the agroecosystems

2017 ◽  
Vol 84 (0) ◽  
Author(s):  
Gabriela Silva Moura ◽  
Gilmar Franzener
Keyword(s):  
Soil Quality ◽  
Environmental Changes ◽  
Population Level ◽  
Biological Indicators ◽  
Ecological Condition ◽  
Trophic Levels ◽  
Soil Biodiversity ◽  
Production Studies ◽  
Rural Producers ◽  
Very High

ABSTRACT: Nematodes can be associated with the soil ecological condition, thus being associated with this sustainability condition of agricultural production. Studies of their diversity can be applied with the purpose of using them as bioindicators of environmental changes and the productive impacts. However, these organisms have been neglected in the agroecosystems, only assuming status of pathogen when their population is very high, with considerable losses in productivity. It is estimated that approximately 10% of the nematodes cause damage to plants, 25% are nematodes grouped into trophic levels of fungivores or fungal feeders, bacterivorous, and omnivores, according to the type of their food. In many cases it is not known the ratio of population level of the nematode with the level of damage in plants. For this reason, the use of pesticides and fertilizers is still part of the most common practices by farmers, causing loss of soil organic matter, soil erosion and groundwater contamination, in addition to an imbalance in the microbiote. The objective of this work was to make a brief review about the diversity of nematodes in the soil in the agroecosystems that can be used in studies of sustainability, as soil quality bioindicators. Several species of nematodes have the potential to be used as biological indicators of soil quality. In this sense, the knowledge and use of bioindicators by rural producers are important, in order to encourage practices of sustainable management systems that do not cause the soil biodiversity imbalance.

scholarly journals Study of Temporal Variations in Species–Environment Association through an Innovative Multivariate Method: MixSTATICO

2021 ◽  
Vol 13 (11) ◽  
pp. 5924
Author(s):  
Mariela González-Narváez ◽  
María José Fernández-Gómez ◽  
Susana Mendes ◽  
José-Luis Molina ◽  
Omar Ruiz-Barzola ◽  
...  
Keyword(s):  
Environmental Changes ◽  
Abiotic Factors ◽  
Skeletonema Costatum ◽  
Species Conservation ◽  
Environmental Parameters ◽  
Biological Indicators ◽  
Temporal Variations ◽  
Multivariate Method ◽  
Eastern Equatorial Pacific ◽  
The Impact

The study of biotic and abiotic factors and their interrelationships is essential in the preservation of sustainable marine ecosystems and for understanding the impact that climate change can have on different species. For instance, phytoplankton are extremely vulnerable to environmental changes and thus studying the factors involved is important for the species’ conservation. This work examines the relationship between phytoplankton and environmental parameters of the eastern equatorial Pacific, known as one of the most biologically rich regions in the world. For this purpose, a new multivariate method called MixSTATICO has been developed, allowing mixed-type data structured in two different groups (environment and species) to be related and measured on a space–time scale. The results obtained show how seasons have an impact on species–environment relations, with the most significant association occurring in November and the weakest during the month of May (change of season). The species Lauderia borealis, Chaetoceros didymus and Gyrodinium sp. were not observed in the coastal profiles during the dry season at most stations, while during the rainy season, the species Dactyliosolen antarcticus, Proboscia alata and Skeletonema costatum were not detected. Using MixSTATICO, species vulnerable to specific geographical locations and environmental variations were identified, making it possible to establish biological indicators for this region.

scholarly journals ​Differential Perception and Logit Analysis of Climate Change Adaptation Strategies among Dairy Farmers in Arid and Semi-Arid Regions of Haryana

2021 ◽  
Author(s):  
R. Senthil Kumar ◽  
B.S. Meena ◽  
Ritu Chakravarty ◽  
K.S. Kadian ◽  
P. Mooventhan
Keyword(s):  
Climate Change ◽  
Crop Production ◽  
Environmental Changes ◽  
Biological Indicators ◽  
Healthcare Management ◽  
Economic Indicators ◽  
Logit Analysis ◽  
Dairy Farmers ◽  
Adaptation Practices ◽  
Semi Arid

Background: The present research study was undertaken to study the dairy farmer’s perception and adaptation practices against impending climate change in the arid and semi-arid climate regions of Haryana. Methods: The study area Hisar and Karnal Districts had been purposively selected based on rainfall pattern and milk production potential in the state. In this study, interview schedule had been constructed to reveal the dairy farmers perception and adaptation practices against climate change were studied through Environmental, biological and socio-economic indicators. Result: It was found that, last 10 years majority of the farmers perceived significant increase in environmental changes, biological indicators and socio-economic indicators in their dairy farming practices respectively. Due to these perceived changes, the logit analysis had been applied to assess their adaptation practices in the breeding, feeding, healthcare, management and crop production aspects of the various significant levels.

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