Densities of Ecological Replacement Herbivores Required to Restore Plant Communities: A Case Study of Giant Tortoises on Pinta Island, Galápagos

2013 ◽  
Vol 22 (2) ◽  
pp. 248-256 ◽  
Author(s):  
Elizabeth A. Hunter ◽  
James P. Gibbs
Keyword(s):  
Plant Communities

A functional analysis of resistance of plant communities to disturbance: a case study of Beijing nature reserves

2013 ◽  
Vol 21 (2) ◽  
pp. 153-162
Author(s):  
Wang Guohong ◽  
Wang Xiaoping ◽  
Zhang Weikang ◽  
Li He ◽  
Du Lianhai ◽  
...  
Keyword(s):  
Functional Analysis ◽  
Plant Communities ◽  
Nature Reserves

Hydrological changes in the Rzecin peatland (Puszcza Notecka, Poland) induced by anthropogenic factors: Implications for mire development and carbon sequestration

The Holocene ◽  
2016 ◽  
Vol 27 (5) ◽  
pp. 651-664 ◽  
Author(s):  
Krystyna Milecka ◽  
Grzegorz Kowalewski ◽  
Barbara Fiałkiewicz-Kozieł ◽  
Mariusz Gałka ◽  
Mariusz Lamentowicz ◽  
...  
Keyword(s):  
Carbon Sequestration ◽  
Plant Communities ◽  
Human Activity ◽  
Accumulation Rate ◽  
Carbon Accumulation ◽  
Anthropogenic Factors ◽  
Poor Fen ◽  
History Of ◽  
Carbon Accumulation Rates

Wetlands are very vulnerable ecosystems and sensitive to changes in the ground water table. For the last few thousand years, hydrological balance has also been influenced by human activity. To improve their cropping features, drainage activity and fertilizing were applied. The drainage process led to an abrupt change of environment, the replacement of plant communities and the entire ecosystem. The problem of carbon sequestration is very important nowadays. A higher accumulation rate is related to higher carbon accumulation, but the intensity of carbon sequestration depends on the type of mire, habitat, and climatic zone. The main aim of this article was an examination of the changes in poor-fen ecosystem during the last 200 years in relation to natural and anthropogenic factors, using paleoecological methods (pollen and macrofossils). The second aim was a detailed investigation of the sedimentary record to aid our understanding of carbon sequestration in the poor fen of temperate zone. This case study shows that fens in temperate zones, in comparison with boreal ones, show higher carbon accumulation rates which have been especially intensive over the last few decades. To reconstruct vegetation changes, detailed palynological and macrofossil analyses were done. A 200-year history of the mire revealed that it was influenced by human activity to much degree. However, despite the nearby settlement and building of the drainage ditch, the precious species and plant communities still occur.

Quantifying the resilience of plant communities under different grazing intensities in a degraded shrubland: A case study in Mandalgobi, Mongolia

2007 ◽  
Vol 53 (3) ◽  
pp. 192-195 ◽  
Author(s):  
Takehiro Sasaki ◽  
Tomoo Okayasu ◽  
Yasuhito Shirato ◽  
Jamsran Undarmaa ◽  
Kazuhiko Takeuchi
Keyword(s):  
Plant Communities ◽  
Grazing Intensities

Mapping of coastal ecosystems and halophytes (case study of Abu Dhabi, United Arab Emirates)

1998 ◽  
Vol 49 (4) ◽  
pp. 297 ◽  
Author(s):  
Benno Böer ◽  
Derek Gliddon
Keyword(s):  
United Arab Emirates ◽  
Plant Communities ◽  
Abu Dhabi ◽  
Preliminary Assessment ◽  
Environmental Impact Assessments ◽  
Development Plans ◽  
Seawater Irrigation ◽  
Saline Land ◽  
Special Protection

A survey of the coastal zone of Abu Dhabi identified 22 halophytes of which nine are tolerant to inundation by seawater. A preliminary assessment suggested that 3.550 km2 of saline land with a complete absence of natural vegetation was potentially suitable for the development of sustainable agro-ecosystems with halophyte crops and seawater irrigation. Such development plans, however, require the implementation of environmental impact assessments. The inter-tidal plant communities need special protection, as they are fragile, and economically and ecologically valuable.

Syntaxonomic diversity as an indicator of ecological diversity — case study Vranica Mts in the Central Bosnia

Biologia ◽  
2007 ◽  
Vol 62 (2) ◽  
Author(s):  
Sulejman Redžić
Keyword(s):  
Plant Communities ◽  
Bosnia And Herzegovina ◽  
Carrying Capacity ◽  
General Level ◽  
Mountain Range ◽  
Ecological Diversity ◽  
Vegetation Diversity ◽  
High Level ◽  
Very High

AbstractSyntaxonomic diversity (SD) represents the number of plant communities (phytocoenoses) in certain area. Plant communities as organized systems of populations of various coexisting plant species inhabiting same or similar habitat in the function of time. SD is one of the best indicators of the state and potential carrying capacity of every ecosystem and an attribute of total ecological diversity. In general, level of syntaxonomic diversity indicates habitat heterogeneity and diversity. This could have significant importance in the categorization of habitat values in accordance with European Nature Information System (EUNIS) criteria. The results presented in this paper indicate without any doubt high natural values of mountain range Vranica in Bosnia and Herzegovina. One of the best proofs is an extremely high level of syntaxonomic diversity. In this area covering just 288 km2, vegetation is differentiated into 9 formations, 28 classes, 44 orders, 73 alliances and 165 associations. This represents 85% of all classes, 73% of all orders, 65% of all alliances, and 53% of all associations of vegetation in Bosnia and Herzegovina, or 35% of all classes in vegetation diversity in Europe. Going from the level of class to the level of order, the number of syntaxa increases for 61%, from order to alliance for 60%, and from alliance to association for 44.24% (average 55%). SD index is very high and it is 0.5729. This means that on each km2 contains 0.5729 syntaxa.

scholarly journals Anthropogenic Stressors in Upland Rivers: Aquatic Macrophyte Responses. A Case Study from Bulgaria

Plants ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 2708
Author(s):  
Gana Gecheva ◽  
Karin Pall ◽  
Milcho Todorov ◽  
Ivan Traykov ◽  
Nikolina Gribacheva ◽  
...  
Keyword(s):  
Plant Communities ◽  
Vascular Plants ◽  
Aquatic Macrophytes ◽  
Aquatic Macrophyte ◽  
Base Flow ◽  
Urban Structures ◽  
Anthropogenic Stressors ◽  
Biological Responses ◽  
Riparian Habitats

Upland rivers across Europe still exhibit undisturbed conditions and represent a treasure that we cannot afford to lose. We hypothesize that the combination of pristine and modified conditions could demonstrate biological responses along the stressor gradients. Thus, the response of aquatic macrophyte communities to anthropogenic stressors along upland rivers in Bulgaria was studied. Six stressors were selected out of 36 parameters grouped into hydromorphological, chemical variables and combined drivers (catchment land use). The stressors strongly affected species richness on the basis of biological type (bryophytes vs. vascular plants) and ecomorphological type (hydrophytes vs. helophytes). Hydrological alteration expressed by the change of the river’s base flow and altered riparian habitats has led to a suppression of bryophytes and a dominance of riverbank plant communities. Seventy-five percent of mountain sites were lacking bryophytes, and the vegetation at semi-mountainous sites was dominated by vascular plants. It can be concluded that hydropeaking, organic and inorganic pollution, and discontinuous urban structures caused important modifications in the aquatic macrophyte assemblages. Macrophyte abundance and the biological and ecomorphological type of aquatic macrophytes reflect multi-stressor effects in upland rivers.

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