scholarly journals Count trends for migratory Bald Eagles reveal differences between two populations at a spring site along the Lake Ontario shoreline

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e1986 ◽  
Author(s):  
Kyle R. Wright
Keyword(s):  
Growth Rate ◽  
Survival Rates ◽  
Lake Ontario ◽  
Breeding Population ◽  
The United States ◽  
Breeding Birds ◽  
Bald Eagle ◽  
Bald Eagles ◽  
Northern Summer ◽  
Adult Plumage

The recovery of Bald Eagles (Haliaeetus leucophalus), after DDT and other organochlorine insecticides were banned in the United States, can be regarded as one of the most iconic success stories resulting from the Endangered Species Act. Interest remains high in the recovery and growth of the Bald Eagle population. Common to evaluating growth and recovery rates are counts at nesting sites and analyses of individuals fledged per season. But this is merely one snapshot that ignores survival rates as eagles grow to maturity. By analyzing indices from migration counts, we get a different snapshot better reflecting the survival of young birds. Different populations of Bald Eagles breed at different sites at different times of the year. Typical migration count analyses do not separate the populations. A separation of two distinct populations can be achieved at spring count sites by taking advantage of the tendency for northern summer breeding birds to migrate north in spring earlier than southern winter breeding birds who disperse north later in spring. In this paper I analyze migratory indices at a spring site along Lake Ontario. The analysis shows that eagles considered to be primarily of the northern summer breeding population showed an estimated growth rate of 5.3 ± 0.85% (SE) per year with 49% of eagles tallied in adult plumage, whereas the migrants considered to be primarily of the southern breeding population had an estimated growth rate of 14.0 ± 1.79% with only 22% in adult plumage. Together these results argue that the populations of southern breeding Bald Eagles are growing at a substantially higher rate than northern breeding eagles. These findings suggest that aggregate population indices for a species at migration counting sites can sometimes obscure important differences among separate populations at any given site and that separating counts by time period can be a useful way to check for differences among sub-populations.

scholarly journals Impact of Hurricane Isabel on Bald Eagle Nests and Reproductive Performance in the Lower Chesapeake Bay

The Condor ◽  
2007 ◽  
Vol 109 (1) ◽  
pp. 206-209 ◽  
Author(s):  
Bryan D. Watts ◽  
Mitchell A. Byrd
Keyword(s):  
Chesapeake Bay ◽  
Reproductive Performance ◽  
Breeding Population ◽  
Bald Eagle ◽  
Haliaeetus Leucocephalus ◽  
Bald Eagles ◽  
Hurricane Isabel ◽  
The Impact ◽  
Nest Loss ◽  
Average Brood

Abstract Abstract We evaluated the impact of Hurricane Isabel on nest loss and reproductive performance of Bald Eagles (Haliaeetus leucocephalus) in the lower Chesapeake Bay. Approximately 40% of Bald Eagle nest trees (n  =  527) were damaged and 127 nests were lost during the storm. Nest loss was significantly higher than in years prior to and after the storm. Only 46% of pairs that lost nests attempted to breed the following season, compared to 85% of pairs that did not lose nests. Of the pairs that made breeding attempts, only 69% of pairs that lost nests during the hurricane produced young compared to 83% of pairs that did not lose nests. Average brood size was also reduced for pairs that lost nests. The disparity in reproductive performance between the two groups narrowed in the second breeding season after the storm. Hurricane Isabel had a significant but short-lived impact on the Bald Eagle breeding population in the lower Chesapeake Bay.

scholarly journals Banding of Nestling Bald Eagles in Yellowstone and Grand Teton National Parks and Vicinity

1980 ◽  
Vol 4 ◽  
pp. 44-47
Author(s):  
Robert Eng ◽  
Alan Harmata ◽  
Kurt Alt
Keyword(s):  
National Parks ◽  
National Park ◽  
Survival Rates ◽  
Bald Eagle ◽  
Migration Routes ◽  
Mortality Factors ◽  
Dispersal Patterns ◽  
Bald Eagles ◽  
Juvenile Dispersal ◽  
Adequate Funding

A significant population of nesting Bald Eagles (Haliaeetus leucocphalus) occurs in and adjacent to Yellowstone National Park (YNP) and Grand Teton National Park (GTNP). Alt (1980) and Swenson (1975) located 30 Bald Eagle territories within an approximate 15,000 km area encompassing both parks and the surrounding area of southwestern Montana and northwestern Wyoming, designated here as the Yellowstone-Teton area of Influence (YTAI). Although this population is probably essential in producing recruits for the remaining depressed western populations, little is known of the movements and dynamics of this population outside of the breeding season. As a result, a nestling banding project was initiated in the summer of 1979, and expanded to include colormarking in 1980, to determine post fledging movements and population dynamics of Bald Eagles produced in the YTAI. Through band recoveries and returns and resightings of colormarked eagles, attempts will be made to determine: 1) juvenile dispersal patterns 2) immature survival rates 3) longevity 4) wintering areas of YTAI Bald Eagles 5) mortality factors 6) migration routes 7) fidelity to the natal area in successive years 8) importance of the YTAI population in relation to producing recruits for other populations 9) assessment of banding activities on subsequent productivity. With adequate funding, the banding study should continue for at least 3 more years.

Bald Eagle Nesting Habitats in the Upper Mississippi River National Wildlife and Fish Refuge

2013 ◽  
Vol 4 (2) ◽  
pp. 362-376 ◽  
Author(s):  
Neal D. Mundahl ◽  
Anthony G. Bilyeu ◽  
Lisa Maas
Keyword(s):  
Land Cover ◽  
Mississippi River ◽  
The United States ◽  
Bald Eagle ◽  
Haliaeetus Leucocephalus ◽  
Upper Mississippi River ◽  
Human Disturbances ◽  
Bald Eagles ◽  
Land Cover Types ◽  
Nest Sites

Abstract This study examined habitat variables associated with 53 active bald eagle Haliaeetus leucocephalus nest sites in the Winona District of the Upper Mississippi River National Wildlife and Fish Refuge, Minnesota and Wisconsin. The Refuge is the most heavily visited refuge in the United States, where breeding eagle populations have been increasing dramatically. During February–April 2009, nest trees were identified and measured, nest heights were determined, distances to nearest water bodies were assessed, and forest inventories were conducted for the standing timber surrounding the nest trees. Nest densities and spacing were assessed within each navigation pool, and land cover types were examined within 100- and 1,000-m radii around known eagle nest sites and random points within the Refuge. Ninety-three percent of nest sites had supercanopy eastern cottonwoods Populus deltoides and silver maples Acer saccharinum as the nest trees. Potential human disturbances from highways, railroads, and commercial barge and recreational boat traffic were present within 400 m of 90% of known nest sites. Eagle nest sites were located an average of 1.52 km from the next nearest nest, with nest densities ranging from 0.32 to 9.72 nests/100 km2 among the four navigation pools of the Winona District. Land cover types around known nest sites and random points differed significantly at both 100- and 1,000 m scales, with wet forest and open water significantly more abundant and agricultural and developed lands significantly less abundant than around randomly selected points. Successful nests that fledged at least one young were spaced significantly further away from other active nests and were located in areas with lower tree density than were unsuccessful nests. Floodplain-nesting bald eagles tended to select the tallest, dominant trees for nest sites, placing nests near the height of the surrounding canopy. Human presence within the Refuge does not appear to be limiting the expansion of nesting bald eagles in this riverine habitat.

The United States as the Trade Partner of Poland in te Context of the Transatlantic Trade and Investment Partnership (TTIP)

2014 ◽  
Vol 9 (3) ◽  
pp. 201-213
Author(s):  
Renata Marks-Bielska ◽  
Wiesława Lizińska ◽  
Izabela Serocka
Keyword(s):  
Growth Rate ◽  
Foreign Trade ◽  
The United States ◽  
Average Growth ◽  
Transatlantic Trade ◽  
Central Statistical ◽  
The Usa ◽  
Central Statistical Office ◽  
Trade Partner ◽  
Structure Of Trade

Evaluation of the importance of the USA as the trade partner of Poland is the main objective of the paper, based on the changes in the value of trade during the years 2000-2012 and changes in the structure of trade during the years 2008-2012. The data from the Statistical Yearbooks of Foreign Trade published by the Central Statistical Office was used. The potential for foreign trade growth was illustrated using the simplified analysis based on the gravity model of foreign trade concept. Gradually increasing value of Polish trade with the USA (the average growth rate 9.8%, EU-15 countries 13.1%). Polish exports are characterised by a higher than imports growth rate (USA - exports growth by 12.5%, imports 9.2%, EU-15 - exports 15.1%, imports 11.6%). Trade is strongly dominated by position of one group of products (over 30% share in both exports and imports). The potential of trade is poorly exploited currently. Trade was focused mainly on the countries situated in the close neighbourhood (mainly the EU countries with the domination of Germany).

Hunting the eagle killer: A cyanobacterial neurotoxin causes vacuolar myelinopathy

Science ◽  
2021 ◽  
Vol 371 (6536) ◽  
pp. eaax9050
Author(s):  
Steffen Breinlinger ◽  
Tabitha J. Phillips ◽  
Brigette N. Haram ◽  
Jan Mareš ◽  
José A. Martínez Yerena ◽  
...  
Keyword(s):  
United States ◽  
Aquatic Vegetation ◽  
Southeastern United States ◽  
Hydrilla Verticillata ◽  
Toxin Production ◽  
The United States ◽  
Biosynthetic Gene Cluster ◽  
Biosynthetic Gene ◽  
Bald Eagles ◽  
Cyanobacterial Species

Vacuolar myelinopathy is a fatal neurological disease that was initially discovered during a mysterious mass mortality of bald eagles in Arkansas in the United States. The cause of this wildlife disease has eluded scientists for decades while its occurrence has continued to spread throughout freshwater reservoirs in the southeastern United States. Recent studies have demonstrated that vacuolar myelinopathy is induced by consumption of the epiphytic cyanobacterial species Aetokthonos hydrillicola growing on aquatic vegetation, primarily the invasive Hydrilla verticillata. Here, we describe the identification, biosynthetic gene cluster, and biological activity of aetokthonotoxin, a pentabrominated biindole alkaloid that is produced by the cyanobacterium A. hydrillicola. We identify this cyanobacterial neurotoxin as the causal agent of vacuolar myelinopathy and discuss environmental factors—especially bromide availability—that promote toxin production.

scholarly journals Public Compliance With Social Distancing Measures and SARS-CoV-2 Spread

2021 ◽  
pp. 003335492110112
Author(s):  
Hongjie Liu ◽  
Chang Chen ◽  
Raul Cruz-Cano ◽  
Jennifer L. Guida ◽  
Minha Lee
Keyword(s):  
Growth Rate ◽  
Reproduction Number ◽  
Early Stage ◽  
Human Mobility ◽  
The United States ◽  
Density Change ◽  
Regression Coefficients ◽  
Daily Growth Rate ◽  
Daily Growth ◽  
Social Distancing

Objective We quantified the association between public compliance with social distancing measures and the spread of SARS-CoV-2 during the first wave of the epidemic (March–May 2020) in 5 states that accounted for half of the total number of COVID-19 cases in the United States. Methods We used data on mobility and number of COVID-19 cases to longitudinally estimate associations between public compliance, as measured by human mobility, and the daily reproduction number and daily growth rate during the first wave of the COVID-19 epidemic in California, Illinois, Massachusetts, New Jersey, and New York. Results The 5 states mandated social distancing directives during March 19-24, 2020, and public compliance with mandates started to decrease in mid-April 2020. As of May 31, 2020, the daily reproduction number decreased from 2.41-5.21 to 0.72-1.19, and the daily growth rate decreased from 0.22-0.77 to –0.04 to 0.05 in the 5 states. The level of public compliance, as measured by the social distancing index (SDI) and daily encounter-density change, was high at the early stage of implementation but decreased in the 5 states. The SDI was negatively associated with the daily reproduction number (regression coefficients range, –0.04 to –0.01) and the daily growth rate (from –0.009 to –0.01). The daily encounter-density change was positively associated with the daily reproduction number (regression coefficients range, 0.24 to 1.02) and the daily growth rate (from 0.05 to 0.26). Conclusions Social distancing is an effective strategy to reduce the incidence of COVID-19 and illustrates the role of public compliance with social distancing measures to achieve public health benefits.

Breast cancer survival rates among Chinese women born in East Asia and the United States

2005 ◽  
Vol 15 (8) ◽  
pp. 634-634
Author(s):  
S CHUANG ◽  
W CHEN ◽  
M HASHIBE ◽  
G LI ◽  
P GANZ ◽  
...  
Keyword(s):  
Breast Cancer ◽  
United States ◽  
East Asia ◽  
Cancer Survival ◽  
Chinese Women ◽  
Survival Rates ◽  
The United States ◽  
Breast Cancer Survival

EPID-10. GLIOMA INCIDENCE AND SURVIVAL BY INCOME LEVEL IN THE UNITED STATES GENERAL POPULATION AGES AND ABOVE FROM 2000-2018

2021 ◽  
Vol 23 (Supplement_6) ◽  
pp. vi87-vi88
Author(s):  
Jennifer Murillo ◽  
Elizabeth Anyanda ◽  
Jason Huang
Keyword(s):  
United States ◽  
General Population ◽  
Survival Data ◽  
Survival Rates ◽  
The United States ◽  
Income Level ◽  
Population Based ◽  
Research Database ◽  
Income Levels ◽  
Average Survival

Abstract Gliomas are the most common primary malignant brain tumor in the United States with previous studies showing the incidence varied by age, sex, and race or ethnicity. Survival after diagnosis has also been shown to vary by these factors. Also, socioeconomic status and its association with various cancers have also been studied at length over time. PURPOSE: The purpose of our research was to quantify the differences in incidence and survival rates of gliomas in 15 years and older by income level. METHODS: This population-based study obtained incidence and survival data from the Incidence-SEER Research Database the general population. Average age incidence were generated by glioma groups and grouped by income levels. Survival rates were generated by overall glioma diagnosis grouped by observed survival at 12, 24, 36, 48 and 60 months and by again by income levels. The analysis included 94,207 patients with glioma diagnosed in those aged 15 years or older. RESULTS: Overall, 94, 207 patients diagnosed with glioma were analyzed. Of these, 1,089 (1.16%) fell into the < $35k group, 1,684 (1.79%) in the $35k-$40k group, 3,473 (3.69%) in the $40k-$45k group, 5,647 (5.99%) in the $45k-$50k group, 7,138 (7.58%) in the $50k-$55k group, 6,468 (6.87%) in the $55k-$60k group, 15,348 (16.29%) in the $60k-$65k group, 13,216 (14.03%) in the $65k-$70k group, 9,035 (9.59%) in the $70k-$75k group, and 31,109 (33.02%) fell in > $75k group. The data was also broken further down into survivability showing average survival. CONCLUSION: Incidence of glioma and 12, 24, 36, 48 and 60 month survival rates after diagnosis vary significantly by income level with higher income level greater than $75,000+ having higher incidence and higher survival rates compared with lower income levels. Further research is needed to help determine risk factors and barriers to care to help reveal health disparities.

scholarly journals Descriptive analysis of 192 cases of breast cancer occurring before age 40 in Yaounde, Cameroon

2017 ◽  
Vol 6 (7) ◽  
pp. 2704 ◽  
Author(s):  
Félix Essiben ◽  
Pascal Foumane ◽  
Esther JNU Meka ◽  
Michèle Tchakounté ◽  
Julius Sama Dohbit ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Ductal Carcinoma ◽  
Early Stage ◽  
Descriptive Analysis ◽  
Survival Rates ◽  
The United States ◽  
Therapeutic Modalities ◽  
History Of ◽  
Case Files ◽  
Common Histological Type

Background: Breast cancer is today a global health problem. With 1,671,149 new cases diagnosed in 2012, it is the most common female cancer in the world and accounts for 11.9% of all cancers and it affects more people than prostate cancer. In 2008, The United States statistics showed that, for all cancer that affect women before 40 years, more than 40% of them concerned the breast. The aim of this study was to describe the clinical, histopathological and therapeutic aspects of breast cancer in women under 40 years of age in Yaoundé.Methods: This was a retrospective study with data collected from 192 medical case files of women treated over a period of 12 years, from January 2004 to December 2015 at the Yaounde General Hospital and the Yaounde Gyneco-Obstetric and Pediatric Hospital. Microsoft Epi Info version 3.4.5 and SPSS version 20.0 softwares were used for data analysis.Results: From 2004 to 2015, 1489 cases of breast cancer were treated in both hospitals. Of these, 462 women were less than 40 years old, representing a proportion of 31.0%. The mean age at diagnosis was 33.5±5.0 years and 17.7% of women had a family history of breast cancer. The average time before an initial consultation was 6.7±6.6 months.  Most cases were classified as T4 (46.1%). The most common histological type was ductal carcinoma (87.4%). Grades SBR II and SBR III were predominant (76.4%). Axillary dissection (64.4%) and neoadjuvant chemotherapy (43.9%) were the main therapeutic modalities. The overall survival rate at 5 years was 51.2%. Five-year survival rates with no local recurrence and no metastatic occurrence were 35.8% and 43.2% respectively.Conclusions: Breast cancer largely affects women under the age of 40 and is often discovered late, at an advanced stage. The prognosis appears poor. Only screening could facilitate diagnosis at an early stage of the disease for better outcomes.

Biological and Toxicologtcal Effects of Environmental Contaminants in Fish and Their Eggs

1983 ◽  
Vol 40 (3) ◽  
pp. 306-312 ◽  
Author(s):  
A. J. Niimi
Keyword(s):  
Rainbow Trout ◽  
Organic Contaminants ◽  
Yellow Perch ◽  
Survival Rates ◽  
Lake Ontario ◽  
Smallmouth Bass ◽  
Salmo Gairdneri ◽  
White Bass ◽  
Morone Chrysops ◽  
Contaminant Transfer

Rainbow trout (Salmo gairdneri), white sucker (Catostomus commersoni), white bass (Morone chrysops), smallmouth bass (Micropterus dolomieui), and yellow perch (Perca flavescens) were collected from Lakes Ontario and Erie to examine the relationship between contaminant levels in females and their eggs. Factors such as the percent lipid in the fish and percent of total lipid deposited in the eggs significantly influenced (P < 0.01) contaminant transfer. The percentages of the 9–11 organic contaminants transferred generally showed less variation within a species than the percentages for a substance transferred among the five species examined. This relationship was consistent even though there was over a 10-fold range in contaminant concentrations within a given species. Mercury did not demonstrate this response because the percentage in eggs was low for all species. The levels of PCB monitored in eggs of rainbow trout collected from Lake Ontario suggest that egg and fry survival rates could be affected based on the toxicological evidence from other studies. An examination of the possible effects of spawning on the kinetics of contaminants among these species suggests that relative body concentrations of organic contaminants may be decreased by 5% or be increased by 10%, and mercury levels may be increased by 6–22% following the deposition of eggs. The amount of change varies with species and is influenced by the percent egg weight of body weight, and the rate of contaminant transfer from females to eggs.Key words: toxicology, contaminants, reproduction, Lake Ontario, Lake Erie

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