scholarly journals The role of competitor, stress-tolerant and opportunist species in the development of indexes based on rocky shore assemblages for the assessment of ecological status

2019 ◽  
Vol 107 ◽  
pp. 105556
Author(s):  
Susana Pinedo ◽  
Enric Ballesteros
Keyword(s):  
Rocky Shore ◽  
Ecological Status

9.8 The Role of Forbs and Shrubs in the Nitrogen Intake of Grazing Livestock in the Accra Plains

1982 ◽  
Vol 6 ◽  
pp. 189-191
Author(s):  
F. K. Fianu
Keyword(s):  
Rainy Season ◽  
Ecological Status ◽  
Panicum Maximum ◽  
Andropogon Gayanus ◽  
Nitrogen Intake ◽  
Almost All ◽  
Free Ranging ◽  
Grazing Livestock ◽  
Accra Plains

Free ranging cattle in the Accra Plains of Ghana have an almost all grass diet during the rainy season when lush grass abounds (Fianu, 1966). Depending on the ecological status of the grassland, the prominent species include Andropogon gayanus, Brachiaria falcifera, Panicum maximum, Schizachyrium schweinfurthii and Vetiveria fulvibarbis. On bush fallows, grasses of lower successional status, e.g. Chloris and Digitaria spp., are grazed.At the start of the rainy season (March-April), the young herbage may contain as much as 2.8% N. As the plant matures, however, the N content declines rapidly below critical levels, e.g. 0.95-1.3% at 18 weeks (Fianu and Winch, 1980) and 0.6-0.8% at 38 weeks (Lansbury, Rose Innes and Mabey, 1965).Such mature grass is burnt in the dry season to induce a more nutritious flush but hard grazing and slashing also induce equally nutritious regrowth (Fianu and Winch, 1980).

scholarly journals Algae Flora of the Lake Krivoye in Early XXI Century (Novosibirsk Oblast)

2017 ◽  
Author(s):  
Keyword(s):  
Cultural Landscape ◽  
Ecological Status ◽  
Seasonal Succession ◽  
Analysis Data ◽  
Pollution Level ◽  
Past Century ◽  
Novosibirsk Oblast ◽  
Phytoplankton Species Composition ◽  
Lake Status

Outcomes of the Lake Krivoye main algal characteristic studies have been presented. The lake is located in Novosibirsk Oblast Karasuk Rayon and relates to the Karasuk River cultural landscape. There are very few easily accesible materials concerning the lake status, and the most of tham are dated back to the middle of the past century. Therefore, the lake contemporary ecological status is of special interest. Within the framework ofthis study the phytoplankton species composition and its seasonal succession have been investigated. Analysis of the qualitative development (abundance, biomass, etc.) has been performed, the role of the main algae divisions in its formation has been considered. In the process of studying sets of the main predominate species for each stage of selection has been found and the species diversity and community uniformity indices have been analysed. Such a significant indicator of the hydrocoles community morpho/functional structure as dimesional cell characteristics has been discussed. The pollution level has been assessed on the basis of the saprogenic/biological analysis data and the water quality class gas been determined.

scholarly journals Developing the paradigm of environmental management in agriculture (to the 175-th anniversary of V.V. Dokuchaev)

2021 ◽  
pp. 5-26
Author(s):  
V. I. Kiryushin
Keyword(s):  
Environmental Management ◽  
Land Reclamation ◽  
Ecological Status ◽  
Farming Systems ◽  
Agricultural Landscapes ◽  
Theory And Practice ◽  
Adaptive Landscape ◽  
Ecological Planning ◽  
Club Of Rome

The main stages of the formation of ecological paradigms of environmental management are considered, the fundamental role of V.V. Dokuchaev ideas and the importance of following V.I. Vernadskiy works in their development are shown. The role of scientists of the Club of Rome in the development of the ideology of sustainable development and its controversial perception by the world scientific community is reflected. The analysis of the existing paradigms, in particular of the co-evolutionary paradigm, and its implementation in the theory and practice of adaptive-landscape farming systems is given. The priority tasks for its improvement are defined. Further prospects for its development are considered in the framework of the proposed constructive-biospheric paradigm of environmental management, which implies the creation of a network of agricultural landscapes (agricultural, water, land reclamation, agro-industrial, rural forestry, livestock, residential) in compliance with the ecological status of the territory. The grouping of ecological functions of the landscape and mechanisms of their transformation into socio-economic functions are considered as tools for landscape-ecological planning and design.

scholarly journals Response of rocky shore communities to anthropogenic pressures in Albania (Mediterranean Sea): Ecological status assessment through the CARLIT method

2016 ◽  
Vol 109 (1) ◽  
pp. 409-418 ◽  
Author(s):  
Aurélie Blanfuné ◽  
Charles François Boudouresque ◽  
Marc Verlaque ◽  
Sajmir Beqiraj ◽  
Lefter Kashta ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Rocky Shore ◽  
Ecological Status ◽  
Anthropogenic Pressures ◽  
Ecological Status Assessment ◽  
Status Assessment ◽  
Rocky Shore Communities

scholarly journals Intrinsic ecological dynamics drive biodiversity turnover in model metacommunities

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jacob D. O’Sullivan ◽  
J. Christopher D. Terry ◽  
Axel G. Rossberg
Keyword(s):  
Species Interactions ◽  
Potential Role ◽  
Ecological Status ◽  
Structural Instability ◽  
Spatially Explicit ◽  
Management Tools ◽  
Spatially Explicit Model ◽  
Ecological Dynamics ◽  
The Impact

AbstractTurnover of species composition through time is frequently observed in ecosystems. It is often interpreted as indicating the impact of changes in the environment. Continuous turnover due solely to ecological dynamics—species interactions and dispersal—is also known to be theoretically possible; however the prevalence of such autonomous turnover in natural communities remains unclear. Here we demonstrate that observed patterns of compositional turnover and other important macroecological phenomena can be reproduced in large spatially explicit model ecosystems, without external forcing such as environmental change or the invasion of new species into the model. We find that autonomous turnover is triggered by the onset of ecological structural instability—the mechanism that also limits local biodiversity. These results imply that the potential role of autonomous turnover as a widespread and important natural process is underappreciated, challenging assumptions implicit in many observation and management tools. Quantifying the baseline level of compositional change would greatly improve ecological status assessments.

scholarly journals Charophyte variation in sensitivity to eutrophication affects their potential for the trophic and ecological status indication

2021 ◽  
pp. 30
Author(s):  
Agnieszka Kolada
Keyword(s):  
Water Quality ◽  
Significant Contribution ◽  
Ecological Status ◽  
Taxonomic Diversity ◽  
Trophic Gradient ◽  
Eutrophic Lakes ◽  
Trophic Conditions ◽  
Index Approach ◽  
The Mean

Charophytes (stoneworts) form a group of macrophytes that are considered sensitive to eutrophication. The high indicator value of charophytes toward eutrophication results in their wide use in the bioassessment systems. I explored the variability of stonewort communities' requirements for trophic conditions in lowland temperate lakes and attempted to determine the role of individual syntaxa in assessing the ecological status of lakes in Poland. The position of charophyte communities' niches along the trophic gradient was analysed using the Outlying Mean Index approach. A few stonewort communities, i.e., Nitelletum opacae, N. mucronatae, N. flexilis and Charetum filiformis appeared to be specialised concerning water quality and may be considered indicators of habitats less eutrophic than the “mean” trophic conditions in the study domain. Most stonewort communities were relatively common in European waters. Four of them, i.e., Charetum tomentosae, C. asperae, C. contrariae and Nitellopsidetum obtusae, can be classified as ‘generalists’ with low marginality and broad ecological tolerance. Most stonewort communities appeared in a broad range of ecological status classes. In the case of 15 communities, 6 to 25% of occurrences were observed in lakes representing a less than good status, and they cannot be considered indicative of good ecological conditions. However, the high taxonomic diversity and extensive phytolittoral zone were most likely to occur when the phytocoenoses of stoneworts were present. In lowland naturally eutrophic lakes inhabited by eurytopic species, the extraordinary role of charophytes in the assessment of the ecological status can be interpreted through their significant contribution to the development of the littoral.

scholarly journals STRUKTUR KOMUNITAS, PERANAN DAN ADAPTASI MAKROALGA DI INTERTIDAL BERBATU

OSEANA ◽  
2020 ◽  
Vol 45 (1) ◽  
pp. 59-69
Author(s):  
Tri Handayani
Keyword(s):  
Sea Urchin ◽  
Rocky Shore ◽  
Morphological Changes ◽  
Benthic Fauna ◽  
Physical Factors ◽  
Nursery Ground ◽  
Sea Star ◽  
Tidal Waves ◽  
Primary Producer

Rocky shore intertidal occurs at the interface of the land and sea, which regularly exposed with tidal waves. In general, rocky shore intertidal is influenced by extreme physical factors, so organisms need to adapt well. Macroalgae on rocky shore intertidal are mostly macroalgae that have epilithic life foam, for example, Sargassum, Turbinaria, Hypnea, Gracilaria, Amphiroa, Chaetomorpha, Ulva, Acanthophora, and Gelidium. The role of macroalgae on rocky shore intertidal are as a primary producer/primary productivity, food for other organisms (fish, mollusc, sea urchin, crab), nursery ground for other organisms (fish, sea urchin, sea cucumber, and crab), and provide shelter for benthic fauna (crabs, sea urchin, molluscs, polychaeta and sea star). The adaptation of macroalgae on rocky shore intertidal was through morphological changes. Gracilaria salicornia on rocky shore intertidal has slimmer thallus than G. salicornia on non-rocky shore intertidal.

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