Requiem for the Tricolored Blackbird in Mexico?

Western Birds ◽  
2021 ◽  
Vol 52 (3) ◽  
pp. 207-221
Author(s):  
Richard A. Erickson ◽  
Horacio de la Cueva ◽  
Enrique D. Zamora-Hernández
Keyword(s):  
21St Century ◽  
Baja California ◽  
Population Decline ◽  
Species Range ◽  
Foraging Habitat ◽  
Range Contraction ◽  
The Core ◽  
Single Colony ◽  
International Border

We summarize existing literature and document a recent steep population decline and range contraction in the Tricolored Blackbird (Agelaius tricolor) at the southern end of its range, in Baja California, the only state of Mexico in which the species occurs. From >1000 nesting birds using at least 14 sites south to 30° N around the turn of the 21st century, the population declined and contracted northward and upward in elevation to a single colony of ~150 nesting birds near the international border in 2019. Chronic drought, rising temperatures, and habitat losses due primarily to intensification of agriculture in Mexico are largely responsible for the decline, as in the core of the species’ range in California. Because of the reduction of breeding and foraging habitat, we fear the imminent extirpation of the species in Mexico.

Ongoing population decline and range contraction in Norwegian forest grouse

2009 ◽  
Vol 32 (0) ◽  
pp. 179 ◽  
Author(s):  
Finn Gregersen ◽  
Håkon Gregersen
Keyword(s):  
Population Decline ◽  
Range Contraction

The Obligation to Tear Through the Veil: An Analysis and Transformation of Mankind’s Insufficient Complacency Through the Novels of Jenny Offill

Meliora ◽  
2022 ◽  
Vol 1 (2) ◽  
Author(s):  
Maggie Toole
Keyword(s):  
21St Century ◽  
Evolutionary Theory ◽  
Nuclear Family ◽  
Human Existence ◽  
Social Structures ◽  
Clear Picture ◽  
Modern World ◽  
The Core ◽  
The Veil ◽  
Evolutionary Aspects

This thesis explores the ways in which we as humans are alienated by the fundamental social structures of our world and how the novels of Jenny Offill offer a possible remedy. With a specific focus on the psychological and evolutionary aspects of womanhood and motherhood, this text attempts to illustrate the ways in which these novels address the imposing weight of such fundamental structures in the 21st century. Through an analysis of the nuclear family, this thesis examines the debilitating and profound existence of women, and more specifically, mothers. Offill’s novels present a profoundly clear picture of the modern world as it depicts the reality and ramifications of psychoanalytic and evolutionary theory. This work demonstrates how Offill’s texts attempt to remedy the core dissonance of our binary-laden human existence with clarity and realization rather than acceptance of an oversimplified past and a debilitating future.

scholarly journals A coastal population of Large-blotched Ensatina Ensatina klauberi (Caudata: Plethodontidae) in Baja California, México

Check List ◽  
2015 ◽  
Vol 11 (3) ◽  
pp. 1649 ◽  
Author(s):  
Jorge Heriberto Valdez-Villavicencio ◽  
Anny Peralta-Garcia ◽  
Bradford Damion Hollingsworth
Keyword(s):  
Baja California ◽  
Volcanic Field ◽  
Species Range ◽  
Oak Woodlands ◽  
Coastal Population ◽  
San Pedro ◽  
Sierra San Pedro Martir

We found a new population of Ensatina klauberi in San Quintín volcanic field, Baja California. It represents the first coastal population of this species. This record extends the species range ca. 71 km southwest of the southernmost record of E. klauberi in the Sierra San Pedro Mártir and represents the first population discovered outside of coniferous and pine-oak woodlands.

scholarly journals A novel hybrid of Hypericum undulatum (Wavy-leaved St. John’s-wort, Hypericaceae) and its subsequent dispersal

2020 ◽  
Vol 2 (3) ◽  
Author(s):  
Andrew Jones ◽  
Fred Rumsey
Keyword(s):  
De Novo ◽  
Parental Species ◽  
Species Range ◽  
The Novel ◽  
The Core ◽  
St John’S Wort ◽  
St John's Wort ◽  
Core Site

The novel hybrid Hypericum undulatum Schousb. ex. Willd. x H. perforatum L. is described from Cardiganshire (v.c.46) and given the name H. x cereticae R.A. Jones, F.J. Rumsey & N. Robson.  Despite reduced fertility it shows indications of ongoing introgression and signs of recent dispersal up to 5 km from the core site. The hybrid has arisen recently at the northern extremes of the rarer (H. undulatum) parental species’ range, although at neither site are the parents currently sympatric and in the outlying population both are absent, supporting the belief that here it has not arisen de novo but has colonised through unknown agencies.

scholarly journals Practical Precision Electrical Impedance Measurement for the 21st Century – EMPIR Project 17RPT04 VersICal

2019 ◽  
Author(s):  
Oliver Power ◽  
Adam Ziolek ◽  
Andreas Elmholdt Christensen ◽  
Andrei Pokatilov ◽  
Anca Nestor ◽  
...  
Keyword(s):  
21St Century ◽  
Electrical Impedance ◽  
Impedance Measurement ◽  
Research Project ◽  
The Core ◽  
First Results ◽  
Electrical Impedance Measurement ◽  
Measurement Infrastructure

The core objective of EMPIR project 17RPT04 VersICaL is to improve the European measurement infrastructure for electrical impedance, with particular emphasis on the capabilities of developing NMIs and calibration centres. The project will seek to exploit the results of existing research on digital impedance bridges (DIBs) by designing, constructing and validating simple, affordable versions suitable to realise the impedance scale in the range 1 nF to 10 μF and 1 mH to 10 H with relative uncertainties in the range 10-5 to 10-6. The first results of the research project, including the bridge designs and details of a polyphase digitally synthesized multichannel source capable of providing voltage outputs of precise ratio and phase are presented.

scholarly journals Dominant work motives of Russian employees in the second decade of the 21st century

2021 ◽  
pp. 91-97
Author(s):  
M.V. Prokhorova ◽  
◽  
V.S. Kravchenko ◽  
A.E. Barankina ◽  
O.S. Shamina
Keyword(s):  
Qualitative Analysis ◽  
21St Century ◽  
Work Motivation ◽  
Descriptive Statistics ◽  
Working Environment ◽  
The Core ◽  
Negative Work ◽  
Work Motives ◽  
Low Wages ◽  
Non Parametric

Revealed are dominant work motives of Russian employees in the second decade of the 21st century. The authors are based on a two-modal concept of work motivation, the foundations of which were laid by F. Herzberg, highlighting positive and negative labor motivation as independent structures. It was elicited that the core of positive labor motivation is the following: high wages, interesting work, stable and reliable work. In the structure of negative labor motivation, the dominant motive is low wages, the second and third levels are formed by unstable and unreliable work, poor working environment. The study, which was attended by 759 respondents, had being conducted from 2012 to 2020. The questionnaire “Ranking of positive and negative work motives” (RPOM) was applied to collect data. Their processing was carried out using methods of descriptive statistics, non-parametric U test, Mann-Whitney, as well as qualitative analysis.

scholarly journals Selection of foraging habitat and diet of the Hoopoe Upupa epops in the mosaic-like cultural landscape of Goričko (NE Slovenia)

Acrocephalus ◽  
2015 ◽  
Vol 36 (166-167) ◽  
pp. 109-132
Author(s):  
Mojca Podletnik ◽  
Damijan Denac
Keyword(s):  
Home Range ◽  
Agricultural Landscape ◽  
Population Decline ◽  
Home Range Size ◽  
Range Size ◽  
Foraging Habitat ◽  
Convex Polygons ◽  
Upupa Epops ◽  
Mole Crickets ◽  
Selection Of

In 2012 and 2013, the selection of foraging habitats and the diet of the Hoopoe Upupa epops were studied in the Goričko area, where a significant population decline of the species has been recorded in the past 15 years. Goričko is an area with a well-preserved traditional mosaic-like agricultural landscape very rich in biodiversity which, however, is disappearing. The diet was determined using automatic camera recordings of prey brought to chicks by parents. Mole crickets Gryllotalpa gryllotalpa were the most dominant prey (35.4% frequency and 81.3% biomass of prey), followed by Scarab beetles larvae Scarabaeidae, caterpillars Lepidoptera larvae and True flies Diptera. Feeding frequency was highest in the period of most intensive chick growth (between 8 and 21 days of age). Selection of foraging habitat was researched by observation of birds during foraging. Hoopoes foraged mostly in mown meadows and grassy courtyards and, to a lesser extent, on sandy cart tracks and road edges. These habitats were characterized by low vegetation and patches of bare ground that enabled Hoopoes to forage efficiently. Home range size was determined using minimum convex polygons. The maximum home range size was between 42.9 and 57.7 ha, while the percentage of foraging habitats within the home range did not exceed 18%. Based on our results, we propose the following measures for effective Hoopoe conservation in the area: maintaining the present range of existing unimproved meadows, stopping the conversion of meadows into fields, restoring fields to meadows, prohibiting the use of pesticides targeting Mole crickets.

FL Teaching and Learning as a Gateway for Democracy in the 21st Century

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Chiara Fabbian
Keyword(s):  
Social Justice ◽  
Foreign Language ◽  
21St Century ◽  
Teaching And Learning ◽  
The Core ◽  
Information Media ◽  
Multicultural Citizenship ◽  
Media And Technology ◽  
The University ◽  
Career Skills

Responding to the conflicting public perspectives about pedagogical approaches to, and purposes for, language teaching and learning, the authors suggest ways to reconceptualize foreign language (FL) teaching and learning as a springboard toward multicultural citizenship and social justice. The authors propose an approach to FL teaching that aims to develop learners’ information, media, and technology literacies as well as life and career skills, which are vital to succeed in a 21st-century global environment, and to empower them to become engaged citizens and agents of social change in their communities. By reframing FL and culture instruction within a social justice perspective, we devise new and creative ways to make the teaching of FL relevant to collegiate education and at the core of the university mission.

7. Into the 21st century

2018 ◽  
pp. 112-124 ◽  
Author(s):  
Tom Burns
Keyword(s):  
Mental Health ◽  
Artificial Intelligence ◽  
Virtual Reality ◽  
21St Century ◽  
Mental Illnesses ◽  
New Science ◽  
The Core ◽  
New Treatment ◽  
The Brain ◽  
Manage Mental

‘Into the 21st century’ explains how there is an increased focus on how our body, and not just the brain, influences our mental health. Rapidly advancing computer technology, including artificial intelligence and virtual reality, is beginning to provide new treatment possibilities, not just support and simplify the old ones. The development of sophisticated imaging has supercharged the area of neurosciences and the increased understanding of genetics and the new science of epigenetics provide psychiatry with greater tools to identify and manage mental illnesses. A paradox with our increasingly technological and scientific advances is that the core dilemmas of psychiatry appear not to be diminishing. Psychiatry will survive the 21st century, but certainly it is changing.

scholarly journals Urban Sprawl, Food Subsidies and Power Lines: An Ecological Trap for Large Frugivorous Bats in Sri Lanka?

Diversity ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 94 ◽  
Author(s):  
José L. Tella ◽  
Dailos Hernández-Brito ◽  
Guillermo Blanco ◽  
Fernando Hiraldo
Keyword(s):  
Sri Lanka ◽  
Anthropogenic Impacts ◽  
Population Decline ◽  
Ecological Trap ◽  
Power Lines ◽  
Foraging Habitat ◽  
Urban Habitats ◽  
Flying Foxes ◽  
Food Subsidies ◽  
Urbanized Areas

Electrocution is one of the less known anthropogenic impacts likely affecting the bat population. We surveyed 925 km of overhead distribution power lines that supply energy to spreading urbanized areas in Sri Lanka, recording 300 electrocuted Indian flying foxes (Pteropus giganteus). Electrocutions were recorded up to 58 km from the nearest known colony, and all of them were in urbanized areas and very close ( X ¯ = 4.8 m) to the exotic fruiting trees cultivated in gardens. Predictable anthropogenic food subsidies, in the form of cultivated fruits and flowers, seem to attract flying foxes to urban habitats, which in turn become ecological traps given their high electrocution risk. However, electrocution rates greatly varied among the 352 power lines surveyed (0.00–24.6 indiv./km), being highest in power lines with four wires oriented vertically ( X ¯ = 0.92 indiv./km) and almost zero in power lines with wires oriented horizontally. Therefore, the latter design should be applied to projected new power lines and old vertically oriented lines in electrocution hotspots should be substituted. Given that flying foxes are key seed dispersers and pollinators, their foraging habitat selection change toward urban habitats together with high electrocution risk not only may contribute to their population decline but also put their ecosystem services at risk.

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