Amazing American Songbirds or American Warblers

At the end of April – May, the migration of small songbirds begins in Ontario. By their small size and tinny graceful beaks, they resemble the warblers of the Old World. Warblers of the Old World belong to the Phylloscopus genus and include small insectivorous birds found in Europe, Asia, and Africa. Most of the American small songbird species, occupying similar ecological niches and specializing in insect hunting,  are also called “warblers”. However, taxonomists distinguish warblers of the Old and New World. They place the American species in the family Parulidae or New World Wood Warblers. American “wood” warblers are very different from “true” warblers and have just some morphological similarities, related to adaptation and life to comparable environmental conditions. New World wood-warblers are small passerines that are also mostly insectivorous. During migration and at breeding sites, they vigorously examine trees and shrubs, skillfully extracting insects and arachnids from foliage and inflorescences, from the bark of trees and shrubs, and from other hidden places.

The Latin name of the New World wood warblers’ family – Parulidae – is associated with tits. The Old World tits belong to the genus Parus, described by Carl Linnaeus in 1758. Linnaeus, however, described one of the North American wood warblers – as the “American tit” – Parus americanus. The bird’s Latin name was soon slightly changed, retaining the root. This bird recently still was called Parula americana or Northern Parula and just recently was moved by taxonomists in another genus. Its Latin name now is Setophaga americana. However, the common name “Parula” is originated from the title given to this species by Carl Linnaeus. The entire wood-warbler family name – Parulidae – comes also from a Latin name designating tits – Parus and may be interpreted as “tit-like”. Obviously, both the species and the entire family have nothing to do with either tits or Old World warblers. However, our perception of passerine birds connects these unrelated taxonomic groups. Taxonomists consolidated the name of the family in 1947, highlighting the genus Parula as a type. It is noteworthy that the parula really looks somewhat like a tit: it has a slightly bluish color and when examining trees, especially birches, it can hang upside down, deftly clinging to thin twigs with its long fingers.

The New World Warblers – representatives of this family – occur entirely in the Americas. The family unites small insectivorous birds, many of which are brightly colored, especially males. All American warblers are rather small birds. The smallest species is Lucy’s Warbler (Oreothlypis luciae), weighing about 6.5 g with a length of a little more than 10 cm. Relatively large songbirds are Ovenbird (Seiurus aurocapilla) and Northern Waterthrush (Parkensia noveboracensis) with weight up to 25-28 g and length up to 15-16 cm. Most part of the birds from Parulidae family is associated with forest and shrub communities, nesting in shrub branches and in tree crowns. But there are also species that prefer to settle the nests on the ground, camouflaging them among the roots of trees.

Currently, 119 species of songbirds, belonging to 18 genera, have been listed to the family. It is believed that American warblers were originated and evolved in the northern part of Central America, where even now their species diversity is very great. During the interglacial periods, they spread far to the north, forming a group of long-distant seasonal migrants that fly to nest far beyond the tropical zones in the forested-tundra and taiga of North America.

These birds are found on migration in the Ottawa River Valley on their way to nesting sites in the northern boreal forests. The first migrants arrive in the Ottawa area in late April – early May. It is remarkable that some of the northernmost migrants appear in the northern latitude in late spring-early summer, they can be observed in the parks of Toronto or Ottawa only in late May-early June; they also begin to fly back prompt as early or mid-August. Thus, these birds have adapted to breed in a relatively short nesting season – one and a half to two months. In this period, they need to form pairs, find nesting territories, lay clutches, hatch, and raise chicks. Therefore, the size of clutches in migratory American warblers is quite large, they incubate up to 6-7 eggs and then feed large broods. For comparison, the tropical warblers from the same family usually have clutches with 2-3 eggs.

From May to early June, about 30 species of American warblers migrate through Ontario. Many of them stay for breeding in the orchards, parks, fields, and wetlands around large and small towns. But most migrants fly to the central and northern parts of the province and beyond its territory for nesting in boreal forests. Some the migratory songbirds, such as the Myrtle or Yellow-rumped Warbler (Setophaga coronata), American Yellow Warbler (Setophaga petechia), or Common Yellowthroat (Geothlypis trichas), are abundant and highly visible, while others are not always easy to spot even by a skilled naturalist. They migrate invisibly and quickly, trying to get to nesting places in northern latitudes as soon as possible. Many of those songbirds are characterized by a narrow food specialization. In nesting places, they hunt certain types of insect pests and caterpillars. In years when outbreaks of insect pests are observed, the populations of species-“specialists” also increases, then gradually reducing in accordance with the available natural resources.

It is not easy to spot many songbirds in the breeding places. Even having the bright color of plumage, they dissolve among the leaves of trees in the changeable play of light and shadow. But the presence of many species can be recognized by listening to their characteristic song. Some bird count techniques are based on the knowledge of bird songs and calls. For example, the famous “point count” method includes the identification of all birds around by their songs and calls from one point. The monitoring of breeding birds in North America has been conducted for over 50 years. Any citizen who has an interest in birds and their conservation may contribute his or her “two cents” to one of the bird monitoring programs by joining one of the environmental programs of Birds Canada, for example to the program on the Breeding Bird Survey or Ontario Breeding Bird Atlas. You also can contribute your bird knowledge to the citizen science program on birds survey – ebird, which holds the global database, collecting bird observation data from all naturalists.

Our Planet, Our Future: SEU Didgest, No21

Dear friends and co-fighters,

Welcome to the next issue of Positive News. Let you spread it among your friends and co-fighters in your countries and around the Earth. Please, send me the addresses of your friends and colleagues to be included in the list. I will be glad to receive and publish your positive news from the fields and offices. If you know sites or mailing lists where I can find positive news for our digestы, please send me their addresses.

Sviatoslav Zabelin, SEU coordinator

An Urgent Call for Action

This statement was inspired by the discussions at the 2021 Nobel Prize Summit, issued by the Steering Committee and co-signed by Nobel Laureates and experts.

“It seems appropriate to assign the term ‘Anthropocene’ to the present.” Paul Crutzen (Nobel Laureate 1995). Geologists call the last 12,000 years the Holocene epoch. A remarkable feature of this period has been relative Earth-system stability. But the stability of the Holocene is behind us now. Human societies are now the prime driver of change in Earth’s living sphere – the biosphere. The fate of the biosphere and human societies embedded within it is now deeply intertwined and evolving together. Earth has entered a new geological epoch, the Anthropocene. Evidence points to the 1950s as the onset of the Anthropocene – a single human lifetime ago. The Anthropocene epoch is more likely to be characterized by speed, scale, and shock at global levels. The global commons. Global heating and habitat loss amount to nothing less than a vast and uncontrolled experiment on Earth’s life-support system. Multiple lines of evidence now show that, for the first time in our existence, our actions are destabilizing critical parts of the Earth system that determine the state of the planet. For 3 million years, global mean temperature increases have not exceeded 2oC of global warming, yet that is what is in prospect within this century. We are on a path that has taken us to 1.2oC warming so far – the warmest temperature on Earth since we left the last ice age some 20,000 years ago, and which will take us to >3oC warming in 80 years. At the same time, we are losing Earth resilience, having transformed half of Earth’s land outside of the ice sheets, largely through farming expansion. Of an estimated 8 million species on Earth, about 1 million are under threats. Since 1970s, there has been an estimated 68% decline in the populations of vertebrate species.

Inequality. “The only sustainable prosperity is shared prosperity.” Joseph Stiglitz (Nobel Laureate 2001) While all societies contribute to economic growth, the wealthy in most societies disproportionately take the largest share of this growing wealth. This trend has become more pronounced in recent decades. In highly unequal societies, with wide disparities in areas such as health care and education, the poorest are more likely to remain trapped in poverty across several generations. More equal societies tend to score highly on metrics of well-being and happiness. Reducing inequality raises social capital. There is a greater sense of community and more trust in government. These factors make it easier to make collective, long-term decisions. Humanity’s future depends on the ability to make long-term, collective decisions to navigate the Anthropocene.

Technology. The accelerating technological revolution — including information technology, artificial intelligence, and synthetic biology — will impact inequality, jobs, and entire economies, with disruptive consequences. On aggregate, technological advancements so far have accelerated us down the path toward destabilizing the planet. Without guidance, technological evolution is unlikely to lead to transformations toward sustainability. It will be critical to guide the technological revolution deliberately and strategically in the coming decades to support societal goals.

Planetary stewardship. “We must break down the walls that have previously kept science and the public apart and that have encouraged distrust and ignorance to spread unchecked. If anything prevents human beings from rising to the current challenge, it will be these barriers.” Jennifer Doudna (Nobel Laureate 2020). Effective planetary stewardship requires updating our Holocene mindset. We must act on the urgency, the scale, and the interconnectivity between us and our home, planet Earth. More than anything, planetary stewardship will be facilitated by enhancing social capital — building trust within societies and between societies.

Is a new worldview possible? 193 nations have adopted the SDGs. The global pandemic has contributed to a broader recognition of global interconnectivity, fragility, and risk. Where they possess the economic power to do so, more people are increasingly making more sustainable choices regarding transportation, consumption, and energy. They are often ahead of their governments. And increasingly, the sustainable options, for example solar and wind power, are similar in price to fossil fuel alternatives or cheaper — and getting cheaper.

The question at a global systems level today is not whether humanity will transition away from fossil fuels. The question is: Will we do it fast enough? Solutions, from electric mobility to zero-carbon energy carriers and sustainable food systems, are today often following exponential curves of advancement and adoption. How do we lock this in? The following seven proposals provide a foundation for effective planetary stewardship

The City of New York has filed a lawsuit in state court against Exxon Mobil (XOM), Shell, BP (BP), and the American Petroleum Institute for allegedly misleading New York consumers about the role their products play in climate change and for allegedly “greenwashing” their practices to make them seem more eco-friendly than they are. “Three of the largest oil and gas companies and their top industry trade association—have systematically and intentionally misled consumers in New York City…about the central role their products play in causing the climate crisis,” the lawsuit states. “They have engaged in this deceptive conduct both to compete against growing safer energy options and to distinguish themselves from industry competitors as they vie for consumer dollars.”

Boats laden with seagrass seeds set off from Plymouth Harbour on Wednesday as England’s largest seagrass restoration project got underway. Led by Natural England, the LIFE Recreation ReMEDIES programme will plant eight hectares of biodiverse seagrass meadows off the coast of southern England over the next four years. The project aims to turn the tide for the beleaguered ecosystems, which have declined by 90 percent in the last century due to pollution, trawling and coastal development. Reckoned to sequester carbon 35 times faster than a tropical rainforest, the meadows provide a haven for seahorses and other marine life.  

Trees will no longer be cut down in this 950 sq km (236,000-acre) area after the land was bought by a coalition of conservation organisations to save one of the world’s last pristine rainforests from deforestation. “The forest will now be protected in perpetuity,” says Kay. The news is timed to coincide with Earth Day, the annual event established in 1970 to mobilize action on environmental issues. The newly named Belize Maya Forest is part of 150,000 sq km (38m acres) of tropical forest across Mexico, Belize and Guatemala known as the Selva Maya, a biodiversity hotspot and home to five species of wild cat (jaguars, margay, ocelot, jaguarundi, and puma), spider monkeys, howler monkeys and hundreds of bird species. Combined with the adjacent Rio Bravo Reserve, Belize Maya Forest creates a protected area that covers 9% of Belize’s landmass, a critical “puzzle piece” in the Selva Maya forest region, helping secure a vital wildlife corridor across northern Guatemala, southern Mexico, and Belize. Protecting large areas of pristine rainforests will help mitigate the impacts of the climate crisis. “Forests like these hold vast amounts of carbon,” says Julie Robinson, Belize programme director for the Nature Conservancy, one of the partners behind the acquisition. “We’re at a tipping point, so it’s really important to try to reverse the trend we’re on.” The area was owned by the Forestland Group, a US company that had permits for sustainable logging. When it came up for sale, the Nature Conservancy and others, including Rainforest Trust, World Land Trust, University of Belize Environmental Research Institute, and Wildlife Conservation Society, saw an opportunity to buy the land

Saimaa Geopark has been granted UNESCO Global Geopark (UGG) status by the UNESCO Governing Body. The matter was announced today, Thursday, April 22, 2021 at 3 pm (Finnish time) in Paris. Recognition of the status will continue the development work of Saimaa Geopark, focusing on international nature tourism and bringing vitality to the region, as well as strengthening environmental education with stakeholders in the region. The vitality has been also strengthened by cooperating with entrepreneurs in different projects and creating a Saimaa Geopark Partner network. All the activities of the network are based on principles of sustainable development and the United Nations Agenda 2030 goals. 

Starting in 2004, Asiatic black bears Ursus thibetanus were reintroduced and tracked in the Republic of Korea, along with their descendants, using radio telemetry, yielding 33,924 tracking points over 12 years. Along with information about habitat use, landscape, and resource availability, we estimated the population equilibrium and dispersal capability of the reintroduced population. Researchers used a mixed modeling approach to determine suitable habitat areas, population equilibria for three different resources-based scenarios, and least-cost pathways (i.e. corridors) for dispersal. The population simulations provided a mean population equilibrium of 64 individuals at the original reintroduction site and a potential maximum of 1,438 individuals in the country. The simulation showed that the bear population will disperse to nearby mountainous areas, but a second reintroduction will be required to fully restore U. thibetanus. Northern suitable habitats are currently disconnected and natural re-population is unlikely to happen unless supported. Our methodologies and findings are also relevant for determining the outcome and trajectories of reintroduced populations of other large carnivores (Andersen et al., 2021).

Reverse the Red: the new initiative of IUCN

IUCN – International Union for Nature Conservation – recently launched a new initiative, which aim is “Reverse the Red” or stop and reverse extinction of threatened species in the world.

ReverseTheRed is a global movement that calls for joint action and the belief that our community can ensure the survival of all the species we live with on this planet, as well as ensure the protection of all the ecosystems in which they live. The IUCN Species Survival Commission, which oversees this initiative, tries to involve as many stakeholders as possible in the conservation work. The Species Survival Commission unites more than 7 thousand experts who work in the field of biodiversity conservation in different countries of our blue planet. However, it is definitely clear now that it is impossible to preserve species without the wide participation of not only specialists and narrow experts working in the field of studies and conservation of species and ecosystems, but also the whole society, including different sectors that affect the habitats of species and their populations. Participation of local communities and concerned citizens can also contribute to the protection and restoration of species.

The IUCN Red List contains information on the assessment of species at the global level with an evaluation of the threats for species. All threatened species can be categorized as Vulnerable (VU), Endangered (EN), and Critically Endangered (CR). According to modern estimates, the Red List currently includes 37,400 species, that were categorized as threatened and the state of their populations is of concern at the global level. If you look at taxonomic groups, according to modern estimates, 41% of all amphibian species, 26% of all mammals, 14% of all bird species, 36% of all shark and ray species, as well as 34% of all gymnosperm (coniferous) tree species are threatened with extinction risk. And this is only among those taxonomic groups that have been assessed by experts. But there are still many taxonomic groups on the planet that have not yet been evaluated, for example, many species of invertebrates and angiosperms (flowering) plants, the diversity of which is very high on our planet and extinction of some tiny species may be almost invisible. By now, the conservation biology science and experts involved in nature conservation have accumulated knowledge and methods that allow the preservation of species and ecosystems, ensuring their survival and recovery. Experts from the IUCN Species Survival Commission argue that:
We KNOW how to save species
WE BELIEVE we can
TOGETHER we will

While a strategy to reverse biodiversity loss is still under development, it is now clear that it will be an umbrella initiative to work with key partners to achieve biodiversity conservation and recovery tasks for species and ecosystems. The IUCN Species Survival Commission has identified the following mechanisms to achieve its ambitious goals:
(1) Engage biodiversity conservation partners at national, regional, and global levels in the development of standardized tools and methods. The Reverse the Red initiative creates an umbrella mechanism for the conservation of species and ecosystems. (2) Work with pilot countries to refine and implement tools and collaborative strategies. Increase national capacity and commitment utilizing ReversetheRed framework for target species and ecosystem assessments, planning, and action. (3) Empower the country-based “Reverse the Red” partners to engage and activate their local communities through a diverse set of educational resources focused on biodiversity conservation, personalized experiences, advocacy campaigns, and behavior-change campaigns. (4) Establish a global reporting mechanism and forum to report on and celebrate the reversal of species extinction and ecosystem destruction.
These mechanisms will provide the structure, tools, and framework for objective setting of the Global Species Congress.

You can support this initiative by voting for it at: Webby Awards People’s Voice – Reverse the Red.
Images of threatened animal species from Nepal were used to illustrate this message.