scholarly journals Disapperance Rate of Bovine Fetuses at Grand Teton National Park, State Elk Feedgrounds and at the National Elk Refuge

1996 ◽  
Vol 20 ◽  
pp. 39-44
Author(s):  
Walter Cook ◽  
Elizabeth Williams ◽  
Shelli Dubay ◽  
E. Thorne
Keyword(s):  
National Park ◽  
Habitat Type ◽  
Analysis Of Covariance ◽  
Haliaeetus Leucocephalus ◽  
Bacterial Disease ◽  
Bald Eagles ◽  
Grand Teton National Park ◽  
Greater Yellowstone Area ◽  
Significant Difference ◽  
Bovine Fetuses

Brucellosis is a bacterial disease of cattle that has become established in elk and bison of the Greater Yellowstone Area. It causes elk and bison to abort and has the potential to be transmitted back to domestic cattle, which are now free of the disease. In this study we examined how long healthy bovine fetuses, as surrogates for aborted bison or elk fetuses, remained in the environment and could be available for contact by elk, bison, and cattle. Healthy bovine fetus carcasses were placed on state elk feedgrounds, the National Elk Refuge, and Grand Teton National Park to simulate an elk or bison aborted fetus. Fetuses were monitored until they disappeared due to scavenging. Fetuses took 26 hr on average to disappear from the National Elk Refuge, 46 hr at state elk feedgrounds, and 61 hr at Grand Teton National Park. Ninety percent of the fetuses could be expected to disappear from the National Elk Refuge within 60 hr (2.5 days); from state elk feedgrounds within 105 hr (4.4 days); and from Grand Teton National Park within 140 hr (5.8 days). Analysis of covariance showed that there was a significant difference in fetal disappearance rates depending on habitat type and site of placement. The dominant scavengers at all locations were coyotes (Canis latrans), but ravens (Corvus corax), magpies (Pica pica), bald eagles (Haliaeetus leucocephalus) and golden eagles (Aquila chrysaetos) also frequently participated in scavenging. We found that aborted fetuses could potentially serve as a source of bacterial infection for several days. This study will be expanded to include greater numbers in the coming season.

scholarly journals Disappearance Rate of Bovine Fetuses at Grand Teton National Park, State Elk Feedgrounds and at the National Elk Refuge

1995 ◽  
Vol 19 ◽  
pp. 92-97
Author(s):  
Walter Cook ◽  
Elizabeth Williams ◽  
E. Thorne
Keyword(s):  
Bacterial Infection ◽  
National Park ◽  
Analysis Of Covariance ◽  
Bacterial Disease ◽  
Disappearance Rate ◽  
Grand Teton National Park ◽  
Significant Difference ◽  
Bovine Fetuses ◽  
Preliminary Study

Brucellosis is a bacterial disease that causes elk and bison to abort and may have potential to be transmitted to domestic cattle. In this preliminary study we examined how long healthy bovine fetuses remained in the environment and could be available for contact by elk, bison, or cattle. Healthy bovine fetuses were placed on state elk feedgrounds, the National Elk Refuge, and Grand Teton National Park to simulate an elk or bison aborted fetus. Fetuses were monitored until they disappeared due to scavenging. Ninety percent of the fetuses disappeared from the National elk refuge within 31 hours, but it took 163 and 130 hours for fetuses to disappear from state feedgrounds and Grand Teton National Park, respectively. We found, via analysis of covariance, that there was a significant difference in fetal disappearance rates depending on where the simulated abortions occurred. We also found that aborted fetuses could potentially serve as a source of bacterial infection for several days. This preliminary study will be expanded to include greater numbers of animals and additional locations in coming seasons.

scholarly journals The Status of the Bald Eagle and Osprey in Grand Teton National Park and Vicinity

1978 ◽  
Vol 2 ◽  
pp. 25-30
Author(s):  
Robert Eng ◽  
Kurt Alt
Keyword(s):  
National Parks ◽  
National Park ◽  
Baseline Data ◽  
Bald Eagle ◽  
Haliaeetus Leucocephalus ◽  
Pandion Haliaetus ◽  
Grand Teton National Park ◽  
The Status ◽  
The Impact ◽  
Future Management

With the accelerated use of our national parks there is growing concern over the impact this increased visitation might have on their flora and fauna. For this reason it is important to gather baseline data on the biota for future management and interpretive programs. Two species of concern in Grand Teton National Park are the bald eagle (Haliaeetus leucocephalus) and osprey (Pandion haliaetus).

scholarly journals The Status of the Bald Eagle and Osprey in Grand Teton National Park, Yellowstone National Park and Vicinity

1979 ◽  
Vol 3 ◽  
pp. 27-32
Author(s):  
Robert Eng ◽  
Kurt Alt
Keyword(s):  
Yellowstone National Park ◽  
National Park ◽  
Research Study ◽  
Bald Eagle ◽  
Comparative Data ◽  
Haliaeetus Leucocephalus ◽  
Pandion Haliaetus ◽  
Grand Teton National Park ◽  
The Status

Yellowstone National Park funded a research study conducted by Jon Swenson from 1972 through 1974 on the ecology of the bald eagle (Haliaeetus leucocephalus) and osprey (Pandion haliaetus). The present study was initiated to further the information on the ecology of the bald eagle and osprey in Grand Teton National Park and to obtain comparative data to that obtained by Swenson from Yellowstone National Park.

scholarly journals Effects of Nesting Bald Eagles (Haliaeetus leucocephalus) on Behaviour and Reproductive Rates in a Great Blue Heron (Ardea herodias) Colony in Ontario

2018 ◽  
Vol 131 (4) ◽  
pp. 369-371
Author(s):  
Bill Thompson
Keyword(s):  
Single Species ◽  
Mortality Rates ◽  
Haliaeetus Leucocephalus ◽  
Bald Eagles ◽  
Fish Prey ◽  
Movement Rates ◽  
Ardea Herodias ◽  
Great Blue Heron ◽  
Significant Difference ◽  
Reproductive Rates

Bald Eagles (Haliaeetus leucocephalus) and Great Blue Herons (Ardea herodias) are known to occasionally nest in mixed colonies, even though the former is one of the primary predators of the latter. I observed the two species in four heron colonies near Lake Simcoe, Ontario during two field seasons to assess whether rates of heron chick mortality or nest abandonment were greater in a colony that supported a nesting pair of Bald Eagles than in three nearby single-species colonies. I assessed the effects of eagle presence on heron behaviour using heron movement rates, the number of heron sentries left in colonies during the nesting period, heron nest mortality rates, and the average number of successfully fledged herons per nest. There was no statistically significant difference in movement rate among the four colonies, proportion of birds remaining as sentries, nor nest mortality rates. However, nests in the mixed colony successfully fledged significantly more heron young per nest than did nests in the single-species colonies. The mixed colony was located in a wetland and open lake system that provided extensive foraging habitat and an abundance of the preferred fish prey species of both Great Blue Herons and Bald Eagles, thus reducing predation pressure on the herons.

scholarly journals Local and Long-Range Movements of Bald Eagles Associated with Autumn Concentrations in Glacier National Park, Montana

1979 ◽  
Vol 3 ◽  
pp. 78-81
Author(s):  
B. McClelland ◽  
David Shea ◽  
Harriet Allen ◽  
Elizabeth Spettigue ◽  
Leonard Young
Keyword(s):  
Long Range ◽  
National Park ◽  
Oncorhynchus Nerka ◽  
Haliaeetus Leucocephalus ◽  
Glacier National Park ◽  
Bald Eagles ◽  
Kokanee Salmon ◽  
The Third ◽  
Large Numbers ◽  
Spawning Run

Large numbers of Bald Eagles (Haliaeetus leucocephalus) concentrate in the McDonald Creek area of Glatier National Park each autumn to feed on a spawning run of kokanee salmon (Oncorhynchus nerka). This report summarizes the third year of a continuing study of the local and long-range movements of Bald Eagles from this concentration.

scholarly journals Local and Long-Range Movements of Bald Eagles Associated with the Autumn Concentration in Glacier National Park, Montana

1980 ◽  
Vol 4 ◽  
pp. 88-92
Author(s):  
B. McClelland ◽  
L. Young ◽  
D. Shea ◽  
H. Allen ◽  
J. Crenshaw ◽  
...  
Keyword(s):  
Native Species ◽  
National Park ◽  
Habitat Management ◽  
Bald Eagle ◽  
Haliaeetus Leucocephalus ◽  
Glacier National Park ◽  
Private Land ◽  
High Turnover ◽  
Bald Eagles ◽  
Kokanee Salmon

A concentration of bald eagles (Haliaeetus leucocephalus) along lower McDonald Creek in Glacier National Park was first recorded in November 1939, when 37 were observed (Shea 1978). On that occasion and during each subsequent autumn, bald eagles have congregated to feed on spawning kokanee salmon (Oncorhynchus nerka). Kokanee is a non-native species, first introduced in the Flathead River drainage (in which McDonald Creek occurs) in 1978. Preliminary data suggest that there may be nearly 1,000 bald eagles now stopping at the Glacier concentration annually, although maximum counts are well below this level because of a high turnover rate. The northern subspecies of the bald eagle was classified as endangered in February 1978 under the aegis of the Endangered Species Act of 1973 and subsequent amendments. This conveys a high level of responsibility upon managers of lands and waters used by bald eagles and demands a commitment to effective habitat management. The purpose of our research is to provide information essential to such management - knowledge of movement patterns, spatial and temporal distributions, numbers, and morhpology - directly benefiting not only Glacier National Park managers, but all public agencies, industrial corporations and private land owners responsible for bald eagle habitat. This report summarizes the first part of the fourth year of a study of the ecology of Bald Eagles associated with the Glacier concentration. At this writing eagles are being tracked in the western states. Most data from this autumn have not yet been analyzed.

scholarly journals The Wadden Sea as a National Park and UNESCO World Heritage Site: Students’ Word Associations with These Two Conservation Designations

2021 ◽  
Vol 13 (14) ◽  
pp. 8006
Author(s):  
Till Schmäing ◽  
Norbert Grotjohann
Keyword(s):  
National Parks ◽  
National Park ◽  
Wadden Sea ◽  
World Heritage ◽  
World Heritage Site ◽  
Unesco World Heritage ◽  
Word Associations ◽  
Heritage Site ◽  
Unesco World Heritage Site ◽  
Significant Difference

The Wadden Sea ecosystem is unique in many respects from a biological perspective. This is one reason why it is protected by national parks in Germany and by its designation as a UNESCO World Heritage Site. In biology didactics, there are only a few studies that focus on the Wadden Sea. This work investigates students’ word associations with the two stimulus words “national park” and “UNESCO World Heritage Site”. The survey was conducted among students living directly at the Wadden Sea and among students from the inland. The analysis of the identified associations (n = 8345) was carried out within the framework of a quantitative content analysis to be able to present and discuss the results on a group level. A statistically significant difference was found between the two groups. Overall, results showed that the students made subject-related associations as well as a large number of associations to both stimulus words that could be judged as non-subject-related. In some cases, a connection with the region of residence could be found, but this was not generally the case. Even students’ immediate residential proximity to the Wadden Sea is no guarantee that they have knowledge of the two considered protection terms.

Sign in / Sign up

Export Citation Format

Share Document