Long-Term Effects of Weather on the Cricket (Hadenoecus subterraneus, Orthoptera, Rhaphidophoridae) Guano Community in Mammoth Cave National Park

1995 ◽  
Vol 134 (2) ◽  
pp. 226 ◽  
Author(s):  
Thomas L. Poulson ◽  
Kathleen H. Lavoie ◽  
Kurt Helf
Keyword(s):  
National Park ◽  
Long Term Effects ◽  
Mammoth Cave National Park

scholarly journals Ten-Years Later: Long-Term Analyses of the Abundance and Biomass of the Non-Native New Zealand Mud Snail and Native Invertebrate Communities in the Greater Yellowstone Area

2011 ◽  
Vol 34 ◽  
pp. 147-150
Author(s):  
Teresa Tibbets
Keyword(s):  
Invasive Species ◽  
New Zealand ◽  
National Park ◽  
Macroinvertebrate Community ◽  
Long Term Effects ◽  
Mud Snail ◽  
Greater Yellowstone Area ◽  
Greater Yellowstone ◽  
New Zealand Mud Snail

Invasive species are one of the top two threats to native biodiversity worldwide (Mack et al. 2000). A primary goal of invasion biology is to predict which introduced species become invasive, or reach pest status, and which systems are susceptible to invasion (Heger and Trepl 2003). In order to complete this goal, it is vital to understand long-term dynamics of invasive species populations and their interactions with native communities in their introduced range. Most studies of invasions by non-native species are not extensive enough to determine long-term effects on the native systems (Strayer 2010). The first objective of this study is to determine the long-term abundance and biomass of the New Zealand mud snail, (Potamopyrgus antipodarum), in the Greater Yellowstone Area (GYA). The second objective is to analyze the long-term effects of P. antipodarum on the biomass, abundance, and taxon diversity of native benthic invertebrate assemblages in the GYA. The ten-year span of data available for P. antipodarum and the native macroinvertebrate communities at Lower Polecat Creek in Grand Teton National Park and the Gibbon and Firehole Rivers in Yellowstone National Park provide a unique opportunity to study the macroinvertebrate community succession over time. Data from the proposed macroinvertebrate community survey in the summer of 2011 will be compiled with previous surveys from 2001-2009 to evaluate the long-term changes in the macroinvertebrate community at Polecat Creek and the Gibbon and Firehole Rivers.

scholarly journals Long-term effects of fire frequency and season on herbaceous vegetation in savannas of the Kruger National Park, South Africa

2012 ◽  
Vol 6 (1) ◽  
pp. 71-83 ◽  
Author(s):  
Melinda D. Smith ◽  
Brian W. van Wilgen ◽  
Catherine E. Burns ◽  
Navashni Govender ◽  
Andre L. F. Potgieter ◽  
...  
Keyword(s):  
South Africa ◽  
National Park ◽  
Fire Frequency ◽  
Kruger National Park ◽  
Long Term Effects ◽  
Herbaceous Vegetation

Long term impacts of Phytophthora cinnamomi infestation on heathy woodland in the Great Otway National Park in south-eastern Australia

2020 ◽  
Vol 68 (8) ◽  
pp. 542
Author(s):  
B. A. Wilson ◽  
K. Annett ◽  
W. S. Laidlaw ◽  
D. M. Cahill ◽  
M. J. Garkaklis ◽  
...  
Keyword(s):  
National Park ◽  
Phytophthora Cinnamomi ◽  
Keystone Species ◽  
Plant Species Richness ◽  
Long Term Effects ◽  
Percentage Cover ◽  
Tea Tree ◽  
Eastern Australia ◽  
Disease Extension

The significant impacts of the introduced plant pathogen Phytophthora cinnamomi on native Australian vegetation have been well documented, but there is less knowledge of long-term effects. We assessed long-term (26 years) disease progression and impacts on vegetation floristics and structure at a heathy woodland site in the Great Otway National Park, eastern section. Disease progressed dramatically between 1989 and 2005 and by 2015 only 0.08% of the site was non-diseased. There were significant declines in plant species richness and numbers of susceptible species; and increases in percentage cover of resistant sedges and grasses overall, and in cover of Leptospermum continentale (prickly tea-tree) in post-disease areas. There were significant declines of Xanthorrhoea australis (Austral grass-tree), a keystone species that contributes greatly to vegetation structure and fauna habitat. There is an urgent need to map the distribution of P. cinnamomi affected vegetation and identify floristically important non-diseased vegetation in the national park. It is imperative that quarantine of non-infested areas, phosphite application, track closures and vehicle wash-downs be implemented to reduce disease extension and protect the significant biodiversity of the region including species rich heathlands and nationally listed threatened plant and fauna species and their habitats.

scholarly journals Long term effects of fire frequency and season on the woody vegetation dynamics of the Sclerocarya birrea/Acacia nigrescens savanna of the Kruger National Park

Koedoe ◽  
2000 ◽  
Vol 43 (1) ◽  
Author(s):  
B.W. Enslin ◽  
A.L.F. Potgieter ◽  
H.C. Biggs ◽  
R. Biggs
Keyword(s):  
National Park ◽  
Structural Changes ◽  
Environmental Parameters ◽  
Woody Species ◽  
Fire Frequency ◽  
Kruger National Park ◽  
Woody Vegetation ◽  
Long Term Effects ◽  
Season Of Burn

A lack of knowledge together with vacillating fire management approaches in the Kruger National Park until the mid 1950s, gave rise to a long term fire research experiment aimed at shedding light on savanna responses to various combinations of fire fre- quencies and seasons. This trial was laid out in 1954 in four of the six major vegetation zones of the park. With the future of the experiment now being reconsidered, full scale vegetation surveys have been conducted on all the plots and compared to the surveys done in 1954. This paper examines the woody vegetation responses to fourteen fire treatments in the Knobthorn/Marula savanna. Parameters of interest were woody species composition responses, together with tree & shrub density and structural changes. The results indicate that no significant changes in woody species had occurred for the peri- od 1954 vs 1998, while density decreased on biennial and increased on triennial treatments. The proportion of single stemmed plants increased over the period. Season of burn has a marked effect on structure, with April and August burns giving rise to the largest basal areas but the lowest heights. Environmental parameters such as climate, varying herbivory and differing soils, and their respective interactions on vegetation morphology, together with fire behaviour, further influenced results.

Long-Term Effects of Logging on African Primate Communities: a 28-Year Comparison From Kibale National Park, Uganda

2000 ◽  
Vol 14 (1) ◽  
pp. 207-217 ◽  
Author(s):  
Colin A. Chapman ◽  
Sophia R. Balcomb ◽  
Thomas R. Gillespie ◽  
Joseph P. Skorupa ◽  
Thomas T. Struhsaker
Keyword(s):  
National Park ◽  
Kibale National Park ◽  
Long Term Effects ◽  
Primate Communities

Long-term effects of aquifer overdraft and recovery on groundwater quality in a Ramsar wetland: Las Tablas de Daimiel National Park, Spain

2018 ◽  
Vol 32 (18) ◽  
pp. 2863-2873 ◽  
Author(s):  
Silvino Castaño ◽  
Almudena de la Losa ◽  
Pedro Martínez-Santos ◽  
Rosa Mediavilla ◽  
Juan Ignacio Santisteban
Keyword(s):  
Groundwater Quality ◽  
National Park ◽  
Long Term Effects ◽  
Ramsar Wetland

From town to national park: Understanding the long-term effects of hunting and logging on tree communities in Central Africa

2021 ◽  
Vol 499 ◽  
pp. 119571
Author(s):  
Vincent Maicher ◽  
Connie J. Clark ◽  
David J. Harris ◽  
Vincent P. Medjibe ◽  
John R. Poulsen
Keyword(s):  
National Park ◽  
Central Africa ◽  
Long Term Effects ◽  
Tree Communities

Ovarian Dysfunction in Fetally Irradiated Beagles

1977 ◽  
Vol 35 ◽  
pp. 658-659
Author(s):  
T. M. Seed ◽  
M. H. Sanderson ◽  
D. L. Gutzeit ◽  
T. E. Fritz ◽  
D. V. Tolle ◽  
...  
Keyword(s):  
Gamma Rays ◽  
Low Dose ◽  
Long Term Effects ◽  
Ovarian Dysfunction ◽  
Dose Rates ◽  
Highly Sensitive ◽  
Microscopic Evaluation ◽  
Ovarian Pathology ◽  
Normal Offspring

The developing mammalian fetus is thought to be highly sensitive to ionizing radiation. However, dose, dose-rate relationships are not well established, especially the long term effects of protracted, low-dose exposure. A previous report (1) has indicated that bred beagle bitches exposed to daily doses of 5 to 35 R 60Co gamma rays throughout gestation can produce viable, seemingly normal offspring. Puppies irradiated in utero are distinguishable from controls only by their smaller size, dental abnormalities, and, in adulthood, by their inability to bear young.We report here our preliminary microscopic evaluation of ovarian pathology in young pups continuously irradiated throughout gestation at daily (22 h/day) dose rates of either 0.4, 1.0, 2.5, or 5.0 R/day of gamma rays from an attenuated 60Co source. Pups from non-irradiated bitches served as controls. Experimental animals were evaluated clinically and hematologically (control + 5.0 R/day pups) at regular intervals.

Ultrastructural investigations of MDL 19,660-induced effects on the canine platelet and megakaryocyte

1990 ◽  
Vol 48 (3) ◽  
pp. 374-375
Author(s):  
D.E. Loudy ◽  
J. Sprinkle-Cavallo ◽  
J.T. Yarrington ◽  
F.Y. Thompson ◽  
J.P. Gibson
Keyword(s):  
Antidepressant Drug ◽  
Beagle Dogs ◽  
Long Term Effects ◽  
Short Term ◽  
Platelet Counts ◽  
Toxicological Studies ◽  
Induced Aggregation ◽  
Internal Architecture

Previous short term toxicological studies of one to two weeks duration have demonstrated that MDL 19,660 (5-(4-chlorophenyl)-2,4-dihydro-2,4-dimethyl-3Hl, 2,4-triazole-3-thione), an antidepressant drug, causes a dose-related thrombocytopenia in dogs. Platelet counts started to decline after two days of dosing with 30 mg/kg/day and continued to decrease to their lowest levels by 5-7 days. The loss in platelets was primarily of the small discoid subpopulation. In vitro studies have also indicated that MDL 19,660: does not spontaneously aggregate canine platelets and has moderate antiaggregating properties by inhibiting ADP-induced aggregation. The objectives of the present investigation of MDL 19,660 were to evaluate ultrastructurally long term effects on platelet internal architecture and changes in subpopulations of platelets and megakaryocytes.Nine male and nine female beagle dogs were divided equally into three groups and were administered orally 0, 15, or 30 mg/kg/day of MDL 19,660 for three months. Compared to a control platelet range of 353,000- 452,000/μl, a doserelated thrombocytopenia reached a maximum severity of an average of 135,000/μl for the 15 mg/kg/day dogs after two weeks and 81,000/μl for the 30 mg/kg/day dogs after one week.

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