The role of environmental variables in structuring epiphytic and epilithic diatom assemblages in springs and streams of the Dolomiti Bellunesi National Park (south-eastern Alps)

2009 ◽  
Vol 174 (2) ◽  
pp. 117-133 ◽  
Author(s):  
Marco Cantonati ◽  
Daniel Spitale
Keyword(s):  
Environmental Variables ◽  
National Park ◽  
Eastern Alps ◽  
Diatom Assemblages ◽  
South Eastern ◽  
Epilithic Diatom

scholarly journals Diatom Biodiversity in Karst Springs of Mediterranean Geographic Areas with Contrasting Characteristics: Islands vs Mainland

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2602 ◽  
Author(s):  
Giuseppina G. Lai ◽  
Sara Burato ◽  
Bachisio M. Padedda ◽  
Raffaella Zorza ◽  
Elisabetta Pizzul ◽  
...  
Keyword(s):  
Anthropogenic Impact ◽  
Multivariate Analyses ◽  
Winter Season ◽  
Global Scale ◽  
Diatom Assemblages ◽  
Karst Springs ◽  
Karst Ecosystems ◽  
Structural Indices ◽  
Epilithic Diatom

Karst ecosystems are considered as priority environments for the protection of biodiversity on a global scale. This study provides a first comparative analysis of epilithic diatom flora from karst springs in two Mediterranean geographic areas (Spain and Italy) with contrasting characteristics (islands vs mainland). We investigated twenty-three springs with different anthropogenic impact levels once in the winter season between 2007 and 2017 (N = 23). A total of 176 diatom taxa (56 genera) were found of which 101 (44 genera) were observed in single sites. A general good biotic integrity was revealed by structural indices (species richness, diversity and evenness). However, crenophilous species were generally present and abundant in less impacted springs. Comparing islands and mainland, significant differences were found in species composition and diversity (H’) based on multivariate analyses (global R = 0.610; p = 0.001) and t-test (t = 2.304; p = 0.031). Discharge and Cl− were the most significant variables in determining diatom assemblages. Our results confirm the role of springs as multiple ecotones and refuges for rare species and suggest that the geographic insularity may be an important factor in maintaining diatom biodiversity.

scholarly journals Pteridaie: indicator of the vegetation succession and dynamics in the forests Chablis and Edges in Kahuzi-Biega National Park (Eastern D. R. Congo, Albertine Rift)

2018 ◽  
Vol 6 (1) ◽  
pp. 5
Author(s):  
Mangambu Mokoso Jean De Dieu ◽  
Ntahobavuka Habimana Honorine ◽  
Basinyize Birhashwirwa Pascal ◽  
Lokumu Ilombelombe Lucien-Gédeon ◽  
Robbrecht Elmar
Keyword(s):  
Plant Species ◽  
Environmental Variables ◽  
National Park ◽  
Acid Soils ◽  
Pteridium Aquilinum ◽  
General Aspect ◽  
Mountain Area ◽  
Albertine Rift ◽  
Management And Conservation

This study was done in different forests Chablis and Edges dominated by the Pteridium aquilinum species in the mountain area of Kahuzi-Biega National Park (PNKB), eastern D.R. Congo, along the Mitumba range, in the Albertine Rift. The main goal of this study is to demonstrate the role of that patch of ferns in the recolonization of degraded areas for the forestry reconstruction and dynamics of different holes in that part of the park. The studied grouping is located at 1531 and 2452m of altitude and on acid soils that root allophatic reactions related to the aptitude of roots and rhizomes of Pteridium aquilinum (L.) Kuhn. The high presence of young Phanerophytes in these sites highlights the position of the grouping in the succession and dynamics of the vegetation. The general aspect of the vegetation is dominantly herbaceous, and presented as a green mosaic in the Pteridaie. The sociological classification shows 8 different eco-sociological groups (apart from non-classified) and Canonical Correspondence Analyses show that the relations between environmental variables and species are significant. The complexity of responses obtained warrants to bring more attention to forests Chablis and Edge diversity for better management and conservation of plant species.

scholarly journals Observations on inshore and pelagic Dolphins on the South-Eastern Cape coast of South Africa

Koedoe ◽  
1972 ◽  
Vol 15 (1) ◽  
Author(s):  
G. S Saayman ◽  
D Bower ◽  
C. K Tayler
Keyword(s):  
National Park ◽  
Small Schools ◽  
Eastern Cape ◽  
Seasonal Fluctuations ◽  
The South ◽  
Cape Coast ◽  
Ecological Zones ◽  
Delphinus Delphis ◽  
South Eastern

The occurrence, size and seaward distribution of schools of inshore and pelagic dolphins is described for three study areas on the south-eastern Cape coast (Algoa Bay; the Tsitsikama Coastal National Park and Plettenberg Bay). Inshore dolphins {Tursiops and Sousa sp.) frequented the coastline in relatively small schools whereas pelagic dolphins {Delphinus delphis and Stenella caeruleoalba) occurred in very large schools far out to sea. Different ecological zones were used by Sousa for feeding and for social behaviour and maintenance activities. The frequency of occurrence of Sousa at Plettenberg Bay was not affected by seasonal fluctuations in sea surface temperatures. The role of dolphins as predators and their implication in the regulation of the ecosystem of the Tsitsikama Coastal National Park is discussed.

THE ROLE OF SEA-LEVEL RISE AND STORMS IN FORMATION AND RESILIENCE OF FLORIDA BAY ISLANDS, EVERGLADES NATIONAL PARK

2019 ◽  
Author(s):  
G. Lynn Wingard ◽  
◽  
Miriam C. Jones ◽  
Sarah E. Bergstresser ◽  
Bethany L. Stackhouse ◽  
...  
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
National Park ◽  
Florida Bay ◽  
Everglades National Park ◽  
Bay Islands

Remembering the Battle of Pezi Sla (Greasy Grass—aka Little Bighorn) with the Lakota, Northern Cheyenne, and Arapaho Victory Riders: An Autoethnographic Photo Essay

2021 ◽  
pp. 153270862199112
Author(s):  
Elena Tajima Creef ◽  
Carl J. Petersen
Keyword(s):  
American History ◽  
National Park ◽  
National Park Service ◽  
Northern Cheyenne ◽  
Park Service ◽  
Photo Essay

If one travels to Little Bighorn Battlefield National Park in late June, one can witness at least three events that simultaneously take place each year commemorating what has been called “one of the great mythic and mysterious military battles of American history” (Frosch, 2010). The National Park Service rangers give “battle talks” on the hour to visiting tourists. Two miles away, the privately run U.S. Cavalry School also performs a scripted reenactment called “Custer’s Last Ride”—with riders who have been practicing all week to play the role of soldiers from the doomed regiment of Custer’s 7th Cavalry. On this same day, a traveling band of men, women, and youth from the Lakota, Northern Cheyenne, and Arapaho Nations who have journeyed by horseback and convoy from the Dakotas and Wyoming will reach Last Stand Hill to remember this “Victory Day” from 1876—one that historians have called the “last stand of the Indians” during the period of conflict known as the “Great Sioux War.” This photo essay offers an autoethnographic account of what some have dubbed the annual “Victory Ride” to Montana based upon my participation as a non-Native supporter of this Ride in 2017, 2018, and 2019.

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