Alert distance as an alternative measure of bird tolerance to human disturbance: implications for park design

2001 ◽  
Vol 28 (3) ◽  
pp. 263-269 ◽  
Author(s):  
Esteban Fernández-Juricic ◽  
María Dolores Jimenez ◽  
Elena Lucas
Keyword(s):  
Human Activity ◽  
Human Disturbance ◽  
Bird Species ◽  
Passer Domesticus ◽  
Buffer Zone ◽  
Alternative Measure ◽  
Large Species ◽  
Alert Distance ◽  
The Difference ◽  
Park Design

Animal tolerance to human approaches may be used to establish buffers for wildlife that can minimize the probability that animals will be disturbed by human activity. Alert distance (the distance between an animal and an approaching human at which point the animal begins to exhibit alert behaviours to the human) has been proposed as an indicator of tolerance mainly for waterbirds; however, little is known about its utility for other bird species. The factors that influenced alert distances of four bird species to pedestrian approaches in five large wooded fragments in the city of Madrid (Spain) were analysed. Location of human activity affected only Passer domesticus alert distances, which increased in the proximity of pathways. Habitat structure modified alert distances of all the species (Passer domesticus, Turdus merula, Columba palumbus, and Pica pica), increasing bird tolerance with greater availability of escape cover (shrub and coniferous cover, and shrub height). Alert distances varied among species, with large species being less tolerant of human disturbance than small ones. Alert distance appears to be a more conservative indicator of tolerance than flight distances, because it includes a buffer zone (the difference between alert and flight distance) in which birds may adapt their reaction to the behaviour of visitors. Alert distance may be used in the determination of minimum approaching areas, allowing people to enjoy their visit to parks, and birds to use patches for foraging and breeding without being displaced.

Factors affecting intra- and inter-specific variations in the difference between alert distances and flight distances for birds in forested habitats

2002 ◽  
Vol 80 (7) ◽  
pp. 1212-1220 ◽  
Author(s):  
E Fernández-Juricic ◽  
M D Jimenez ◽  
E Lucas
Keyword(s):  
Bird Species ◽  
Passer Domesticus ◽  
Tree Height ◽  
Large Species ◽  
Pica Pica ◽  
Bare Ground ◽  
House Sparrows ◽  
Factors Affecting ◽  
Predator Prey ◽  
The Difference

Studies of escape from predators have usually focused on fleeing. We studied intra- and inter-specific variations in a previous level of decision-making during predator–prey encounters by determining the difference between the distance at which a predator is detected and the distance at which the prey flees from the predator (buffer distance). We measured buffer distances of four bird species (ground foragers) living in forested habitats (wooded recreational parks) to approaching humans. Buffer distances increased with group size and temperature, and this was probably related to dilution of the predation risk and a higher risk of heat stress, respectively. Buffer distances decreased with shrub and coniferous cover, probably because of increased visual obstruction, and increased with tree height, probably because of the increased security provided by taller trees. Grass cover increased buffer distances of wood pigeons (Columba palumbus) but decreased those of house sparrows (Passer domesticus) and magpies (Pica pica); this may be related to higher food availability, i.e., vegetation in grassy areas for wood pigeons and food left by humans in areas with bare ground for house sparrows and magpies. Buffer distances of blackbirds (Turdus merula) and house sparrows were greater in highly visited parks, which may be related to habituation. Finally, larger species showed greater buffer distances, landed farther away, used higher landing substrates (trees), and flew higher, probably because they need to ensure a certain margin of security from predators. Alternatively, the increased buffer distances of large species may be related to the increasing energy expenditure of flight. The buffer distance appears to be a good indicator of tolerance toward predators and (or) risk taken by prey after detecting predators.

Database of Bird Flight Initiation Distances to Assist in Estimating Effects from Human Disturbance and Delineating Buffer Areas

2016 ◽  
Vol 7 (1) ◽  
pp. 181-191 ◽  
Author(s):  
Kent B. Livezey ◽  
Esteban Fernández-Juricic ◽  
Daniel T. Blumstein
Keyword(s):  
Human Activity ◽  
Land Management ◽  
Human Disturbance ◽  
Human Activities ◽  
Escape Behavior ◽  
Bird Species ◽  
State Agencies ◽  
Bird Flight ◽  
Fish And Wildlife Service ◽  
Flight Initiation

Abstract U.S. Fish and Wildlife Service biologists determine effects from disturbance to threatened and endangered bird species, and staffs of federal and state agencies estimate these effects when delineating protective buffers around habitat of bird species of concern on land management areas. These efforts can be informed by the distances at which human activities cause birds to react or move away. To that end, here we present a database of published alert distances (distances at which birds exposed to an approaching human activity exhibit alert behavior), flight initiation distances (distances at which birds exposed to an approaching human activity initiate escape behavior), and minimum approach distances (distances at which humans should be separated from wildlife). The database distinguishes between nesting and nonnesting situations. The nesting database includes 578 alert distances and 2,177 flight initiation distances from 45 studies representing 11 orders, 27 families, and 49 species of birds. The nonnesting database comprises 1,419 alert distances and 34,775 flight initiation distances from 50 studies representing 19 orders, 89 families, and 650 species.

Three hundred years of House Sparrow (Passer domesticus) persecution in Germany

2007 ◽  
Vol 34 (2) ◽  
pp. 307-317 ◽  
Author(s):  
J. SEITZ
Keyword(s):  
Rural Areas ◽  
House Sparrow ◽  
Bird Species ◽  
Passer Domesticus ◽  
Second World War ◽  
Population Increase ◽  
World War ◽  
Large Numbers ◽  
Urban And Rural Areas ◽  
Second World

Modernization of agriculture, economic development and population increase after the end of the Thirty Years' War caused authorities in many parts of Germany to decree the eradication of so-called pest animals, including the House Sparrow. Farmers were given targets, and had to deliver the heads of sparrows in proportion to the size of their farms or pay fines. At the end of the eighteenth century German ornithologists argued against the eradication of the sparrows. During the mid-nineteenth century, C. L. Gloger, the pioneer of bird protection in Germany, emphasized the value of the House Sparrow in controlling insect plagues. Many decrees were abolished because either they had not been obeyed, or had resulted in people protecting sparrows so that they always had enough for their “deliveries”. Surprisingly, various ornithologists, including Ernst Hartert and the most famous German bird conservationist Freiherr Berlepsch, joined in the war against sparrows at the beginning of the twentieth century, because sparrows were regarded as competitors of more useful bird species. After the Second World War, sparrows were poisoned in large numbers. Persecution of sparrows ended in Germany in the 1970s. The long period of persecution had a significant but not long-lasting impact on House Sparrow populations, and therefore cannot be regarded as a factor in the recent decline of this species in urban and rural areas of western and central Europe.

scholarly journals Can clearcuts increase bird species richness in managed forests?

2008 ◽  
Vol 54 (No. 4) ◽  
pp. 189-193
Author(s):  
M. Żmihorski
Keyword(s):  
Species Richness ◽  
Bird Species ◽  
Bird Communities ◽  
Cumulative Number ◽  
Managed Forests ◽  
Managed Forest ◽  
Bird Species Richness ◽  
Forest Interior ◽  
Transect Counts ◽  
The Difference

Clearcuts are one of the results of forest management. The aim of this study was to assess the effect of clearcuts on bird communities in a managed forest in Western Poland. I applied the method of point transect counts. 20 points were located near clearcuts (less than 100 m from the nearest clearcut) and 25 points in the forest interior. In total, 36 bird species were recorded. On average, I found 9.20 bird species at points located near clearcuts and 6.72 species at points situated in the forest interior, and the difference was significant. The cumulative number of bird species for a given number of sampling points in the vicinity of clearcuts was higher than in the forest interior. The obtained results indicate that in managed, even-aged forests the generation of clearcuts can lead to an increase in local bird species richness.

Variation in the respiratory quotient of birds and implications for indirect calorimetry using measurements of carbon dioxide production

1995 ◽  
Vol 198 (1) ◽  
pp. 213-219 ◽  
Author(s):  
G Walsberg ◽  
B Wolf
Keyword(s):  
Carbon Dioxide ◽  
Power Consumption ◽  
Indirect Calorimetry ◽  
Respiratory Quotient ◽  
Current Knowledge ◽  
Bird Species ◽  
Passer Domesticus ◽  
Carbon Dioxide Production ◽  
Accurate Estimation

Determination of animal power consumption by indirect calorimetry relies upon accurate estimation of the thermal equivalent of oxygen consumed or carbon dioxide produced. This estimate is typically based upon measurement or assumption of the respiratory quotient (RQ), the ratio of CO2 produced to O2 consumed. This ratio is used to indicate the mixture of lipids, carbohydrates and proteins in the metabolic substrate. In this analysis, we report the RQ for two bird species, Passer domesticus and Auriparus flaviceps, under several dietary and fasting regimes. RQ commonly differed substantially from those typically assumed in studies of energy metabolism and often included values below those explainable by current knowledge. Errors that could result from these unexpected RQ values can be large and could present the primary limit to the accuracy of power consumption estimates based upon measurement of carbon dioxide production.

scholarly journals Increasing corvid tolerance to humans in urban ecosystems with increasing latitude

2020 ◽  
Vol 64 (4) ◽  
Author(s):  
Nadezhda Poddubnaya ◽  
Tatyana Korotkova ◽  
Polina Vanicheva
Keyword(s):  
Environmental Factors ◽  
Human Disturbance ◽  
Urban Ecosystems ◽  
Flight Initiation Distance ◽  
Protection Measures ◽  
Non Invasive ◽  
Alert Distance ◽  
Behaviour Changes ◽  
Hooded Crows ◽  
Flight Initiation

The rapid growth of cities causes behaviour changes in birds in response to urban environmental factors. The avian response to human disturbance has recently been studied by a non-invasive research tool as an alert distance (AD) and a flight initiation distance (FID) assessment. The tolerance of hooded crows (n = 395), jackdaws (n = 394) and rooks (n = 169) to humans was assessed by AD and FID. It was shown that the FID of all species is maximal during the summer, when the parents send clear “danger—fly away” signals to the young and the birds fly away. The AD and FID of the three species reliably correlates with the season. Rooks showed FID species-specificity in seven cities of Eastern Europe. Comparison of the attitude of birds to people in cities that have similarities in human culture showed that tolerance increases with increasing latitude in all species and is statistically significant only in the jackdaw. This should be taken into account in environmental protection measures.

scholarly journals APIE (FILOSOFIJOS) PRIGIMTĮ

Problemos ◽  
2009 ◽  
Vol 75 ◽  
pp. 8-33
Author(s):  
Skirmantas Jankauskas
Keyword(s):  
Human Activity ◽  
Aesthetic Experience ◽  
Greek Philosophy ◽  
Poetic Discourse ◽  
The Will ◽  
Way Of Thinking ◽  
The Difference ◽  
Theoretical Thinking

Straipsnyje aptariama graikiškojo filosofavimo genezė, t. y. nagrinėjamos pirmojo filosofijos teiginio susiklostymo prielaidos ir tų prielaidų numanoma teiginio prasmė. Filosofijos istorijoje nusistovėjusios pirmųjų filosofų teiginių interpretacijos kilmė siejama su Aristotelio filosofija. Teigiama, kad Aristotelis graikiškąjį filosofavimą jau visiškai įkurdina rašte. Iš rašto pozicijų Aristotelis žvelgia ir į pirmųjų filosofų ištaras, todėl suvokia jas vien kaip rašto (teorinio mąstymo) elementus. Straipsnyje daroma prielaida, kad filosofavimas prasidėjo ne kaip raštas, o kaip su žmogaus veikla susijęs tradicinis kalbėjimas. Filosofavimo kaip konstruktyvios kalbėjimo atmainos specifiką lėmė antikoje susiklosčiusi refleksijos situacija, kuri siejama su septynių išminčių imperatyvu ‘Pažink save!’ Parodoma, kad šis imperatyvas steigia skirtį tarp logo ir kosmo, kurią antikos išminčius išgyvena kaip sinkretinio gyvenimo vidujybės netektį. Straipsnio autorius interpretuoja filosofavimą kaip kalbėjimą ir veikimą, kuriais antikos išminčius siekia susigrąžinti ikirefleksinę būseną. Teigiama, kad sinkretinių mąstymo įgūdžių nepraradęs antikos išminčius savąjį filosofavimą linkęs aiškinti kaip pritapimo prie kosmo būdą. Kadangi refleksija įkurdina žmogų teorinio mąstymo erdvėje, tai pritapimo prie kosmo veiksmas tegalimas mąstymo plotmėje, todėl filosofavimą steigianti skirtis tarp logo ir kosmo besiplėtojančiame filosofavime nuaidi skirtimis kosme. Tačiau pirmieji išminčiai dar tikisi pilnatviško pritapimo prie kosmo ir tokio pritapimo regimybę jie dar pelno kosmo kaip grožio išgyvenimu, kurį Platonas ir Aristotelis sieja su nuostaba. Pirmoji kanonizuotoji filosofijos ištara interpretuojama kaip estetinį pritapimą prie kosmo referuojantis poetinis bylojimas.Pagrindiniai žodžiai: raštas, priežastis, refleksija, kosmas, pritapimas, archė, grožis, tiesa, būtis.On the Nature (of Philosophy)Skirmantas Jankauskas   SummaryThe paper deals with the genesis of Greek philosophy. The circumstances of the appearance of the first utterance in Greek philosophy and their impact upon its meaning are revealed. The traditional interpretation of the first utterances in the early Greek philosophy is attributed to Aristotle. The latter is said to have transferred Greek philosophizing totally into writing and subsequently to treat the first utterances as elements of writing. In the article, the suggestion is put forward that philosophizing did not begin as a writing but rather as a talking activity immersed in human activity in general. The specificity of philosophizing as constructive talking is related to the situation of reflection, caused by the imperative of the Seven Sages, namely by the imperative ‘Know thyself!”. It is shown here that the imperative introduces the difference between logos and cosmos, which is experienced by a Greek Sage as a loss of sincretic life. Philosophizing is then introduced as an activity of talking, provoked by the will to reestablish the original sincretic state. The author argues that because of syncretist skills, this activity is treated by early Greek philosophers as a way of partaking in cosmos. As reflection conveys a philosopher into the realm of theoretical thinking, partaking in cosmos is possible only as a way of thinking. Consequently, the difference between logos and cosmos in philosophizing resolves itself in the differences of cosmos. Nevertheless, the first philosophers still retained some hope for complete partaking in cosmos, and they gained the illusion of such a partaking by aesthetic experience of cosmos, which was attributed by Plato and Aristotle to wondering. Consequently, the first utterance of Greek philosophy is interpreted in this article as a kind of poetic discourse that refers to the activity of aesthetic partaking in cosmos.Keywords: writing, reason, reflection, cosmos, partaking, arche, the beautiful, truth, being.

scholarly journals Electromagnetic Pollution as a Possible Explanation for the Decline of House Sparrows in Interaction with Other Factors

Birds ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 329-337
Author(s):  
Alfonso Balmori
Keyword(s):  
Electromagnetic Radiation ◽  
Thermal Effects ◽  
House Sparrow ◽  
Bird Species ◽  
Passer Domesticus ◽  
The Other ◽  
Rapid Decline ◽  
House Sparrows ◽  
Electromagnetic Pollution ◽  
The Impact

In recent decades, there has been a decline of the House Sparrow (Passer domesticus), mainly in European cities, and several hypotheses have been proposed that attempt to determine the causes of this rapid decline. Previous studies indicated that house sparrows were significantly negatively associated with increasing electromagnetic radiation and sparrows disappeared from areas most polluted. In addition, there are many studies on the impact of radiation on other bird and non-bird species, as well as numerous laboratory studies that demonstrated detrimental effects at electric field strength levels that can be found in cities today. Electromagnetic radiation is the most plausible factor for multiple reasons, including that this is the only one that affects the other hypotheses proposed so far. It is a type of pollution that affects productivity, fertility, decreases insects (chicken feed), causes loss of habitat, decreases immunity and can promote disease. Additionally, the recent sparrow decline matches the deployment of mobile telephony networks. Further, there are known mechanisms of action for non-thermal effects of electromagnetic radiation that may affect sparrows causing their decline. Thus, electromagnetic radiation must be seriously considered as a factor for house sparrows’ decline, probably in synergy with the other factors previously proposed.

The emergence of tolerance of human disturbance in Neotropical birds

2019 ◽  
Vol 36 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Piotr Tryjanowski ◽  
Jakub Z. Kosicki ◽  
Martin Hromada ◽  
Peter Mikula
Keyword(s):  
North America ◽  
Human Disturbance ◽  
Escape Response ◽  
Bird Species ◽  
Small Scale ◽  
Behavioural Plasticity ◽  
Mato Grosso ◽  
Animal Populations ◽  
History Of ◽  
Rapid Emergence

AbstractAnimals living close to human settlements more often experience disturbance, but also reduced predation risk. Because an escape response is costly, behavioural adjustments of animals in terms of increased tolerance of humans occurs and is often reported in the literature. However, most such studies have been conducted in and around long-existing cities in Europe and North America, on well-established animal populations. Here, we investigate the degree of tolerance of human disturbance across 132 bird species occurring in disturbed (small farms) and undisturbed (intact wetlands and grasslands) areas in Pantanal, Mato Grosso (Brazil), a region with only a very recent history of human-induced disturbance. We found a clear across-species trend toward higher tolerance of human disturbance in birds near farms when compared with birds in wild areas. Such a flexible and perhaps also rapid emergence of tolerance when facing small-scale and very recent human disturbance presumably involves learning and might be attributed to behavioural plasticity. The ability of birds to modify their degree of tolerance of human disturbance may play a key role in the facilitation of wildlife–human coexistence.

scholarly journals Mangrove bird community of Paranaguá Bay - Paraná, Brazil

2007 ◽  
Vol 50 (1) ◽  
pp. 75-83 ◽  
Author(s):  
Luiz Augusto Macedo Mestre ◽  
Ricardo Krul ◽  
Valéria dos Santos Moraes
Keyword(s):  
Human Impacts ◽  
Bird Species ◽  
Passer Domesticus ◽  
Bird Community ◽  
Abundant Species ◽  
Marine Conservation ◽  
Point Counts ◽  
Flying Insects ◽  
Paranaguá Bay ◽  
Conservation Plans

This study describes the mangrove bird community of Paranaguá Bay in Paraná - South Brazil. Seasonal surveys were conducted during September 1997 to September 1998 at three sites in Paranaguá Bay. Frequencies and abundances of birds were registered in 200m transects and one hour point counts. A total of 81 bird species were observed in the three sampling sites. Most of the bird species in Paranaguá mangroves are fruits, seeds and arthropods consumers, and predators of flying insects. The most frequent and abundant species were Egretta caerulea, Ceryle torquata, Chloroceryle amazona, Pitangus sulphuratus, Turdus amaurochalinus and Parula pitiayumi. The bird community of these three sites is composed mainly by forest bird species. The mangroves of Paranaguá Bay shelter one of the richest avifauna of Brazilian mangroves. Differences between sampling sites could be related to the proximity of the Paranaguá city and human impacts in the areas. Only in the most disturbed site were observed Passer domesticus and large flocks of Coragyps atratus. This study contributed to the knowledge of mangrove communities, and could be an important basis to fluvial-marine conservation plans in Paraná- Brazil.

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