praying for the “white dove”: how do wildlife populations ...€¦ · pilgrimages are described...
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PROJECT REPORT
Praying for the “White Dove”: How do wildlife populations perceive massive human
pilgrimages?
Julio Blas Garcíaa
aEstación Biológica de Doñana, CSIC, Americo Vespucio s/n, 41092 Sevilla, Spain
Cover photo: a white stork chick (Ciconia ciconia) in one of the nests selected for this study in the Doñana MaB Biosphere Reserve (upper picture). The field house in the background is the "Palacio del Coto del Rey", one of the major stopover camp sites for pilgrims. A religious pilgrimage (lower picture) is held in Doñana once a year in honor of the Virgin of El Rocio, also known as the “White Dove”. The biosphere reserve is then crossed by thousands of vehicles and hundreds of thousands people in their way to the town of El Rocio. Such a massive human pilgrimage can potentially generate conflict between the maintenance of cultural traditions and the conservation of biodiversity. Photo credits: Julio Blas
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INTRODUCTION
One of the major challenges for conservation biologists is reconciling the
conflicts between human activities and the preservation of biodiversity. As human
population grows, anthropogenic pressures expand and pervade all ecosystems at a
global scale (Vitousek 1997; Ellis & Ramankutty 2008) affecting not only transformed
lands, but also many areas around and within well preserved natural environments
(e.g. Spellerberg 1998; Velando 2011). Biosphere Reserves are not exempt from
anthropogenic activities and in fact, a major reason for their foundation is allowing a
sustainable maintenance of cultural and historical traditions (Madrid Action Plan for
Biosphere Reserves 2008-2013). The extinction of particular traditions is therefore a
reason of concern (e.g. Dasmann 1991; Naveh 1998). But local and initially low-impact
cultural activities can also grow in popularity to become massive social events,
jeopardizing a fine balance between the well-being of both human populations and
the environment.
Figure 1. The Doñana MaB Biosphere Reserve. Location of the Biosphere Reserve, indicating the legal limits of the protected land (National Park and Natural Park), main towns and major routes of pilgrimage through the reserve.
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Such circumstance could be currently taking place in the Doñana National Park,
Spain (Figure 1), a Biosphere Reserve and UNESCO World Heritage Site considered one
of the most important wetlands of the world (Aritio 2001; Garcia Novo 2006). Here
some 300 species of vertebrates (including 6 million migratory birds) coexist with
traditional human activities such as open-range cattle-raising, agriculture, shell-fishing
and agro-environmental tourism (Ruiz de Larramendi 2002; Garcia Novo 2006).
However, during the last decades Doñana has also become an increasingly popular
destination for religious pilgrimages. The Catholic tradition recounts a Virgin appearing
in the village of El Rocío (northern tip of the Park, current population: 750 inhabitants)
in the thirteenth century, quickly becoming a symbol of devotion for the local
communities (Mountfort 1958; Martinez Moreno 1997).
Figure 2. Pilgrims crossing the Doñana Biosphere Reserve. Despite the picture of people walking on their feet beside traditional carriages pulled by livestock (upper three pictures) constitutes the "typical" image of the "El Rocio" (the "White Dove" pilgrimage), this procession involves thousands of trucks, all-terrain cars, carriages and wagons pulled by motor vehicles (lower three pictures). Despite the existence of such non-traditional ways of crossing the reserve is often neglected, it likely exerts negative impacts on the natural resources, and the ease of access that it entails probably explains the dramatic increase in popularity experienced by this pilgrimage during the last decades. Photo credits: Julio Blas.
A pilgrimage is held once a year in honor of the Virgin of El Rocio (the “Romería
de El Rocio”; Figure 2), also known as the “White Dove” (“La Blanca Paloma”). The
originally modest procession has become so popular in this globalized world, that
nowadays the White Dove constitutes one of Spain’s holiest images and the
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pilgrimages are described as a “festival of postmodernity” (Martinez Moreno 1997).
Nowadays the White Dove pilgrimage attracts over one million people at a time (e.g.
1,300,000 persons in 2011), making the modest town of El Rocío the third largest city
of Spain for one week (http://www.visithuelva.com/travelguides/provincia_elrocio-
es.htm). Parades of trucks, all-terrain vehicles, carriages, wagons, horses and hundreds
of thousands of faithful people walking and riding on horseback and travelling for days
through the Park to reach the White Dove.
Figure 3. White Storks. After performing regular surveys in search of nests of several avian species, white storks (Ciconia ciconia) were selected as study models due to the presence of numerous nests beside a major route of pilgrimage. The aggregation of nests within a colony allowed the simultaneous quantification of behavior in a large sample of individuals while concurrently assessing the temporal dynamics of human presence in the same area. Photo credits: Julio Blas.
This spectacular tradition involving men, women, families, the elderly and kids
(Figure 2) takes place right at the height of the breeding season of most wildlife
species inhabiting the National Park, many of which (such as the Iberian Lynx Lynx
pardinus or the Spanish Imperial Eagle Aquila adalberti ) are critically endangered.
Such outstanding spatial and temporal coincidence of humans and wildlife generates a
potential conflict between the preservation and sustainable use of unique biological
resources, and the maintenance of strongly rooted cultural and historical traditions
which are no longer restricted to local communities. At the same time, these
peculiarities offer a unique opportunity to understand how wildlife populations
perceive such massive, but short-term human congregations, and whether they have
evolved biological strategies to overcome anthropogenic stress. Therefore, the main
research goal of this project was to assess whether a massive, but short-term
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presence of humans in the national park during the El Rocio pilgrimage affects the
behavior and breeding performance of wild birds. Understanding such mechanisms
may allow researchers and wildlife managers to develop better conservation
strategies aimed at reconciling conflicts and maximizing sustainable uses of the Earth's
biological, cultural, and historical resources.
ACTIVITIES PERFORMED AND PRELIMINARY RESULTS
Between March 1st and May 15th 2014 (several weeks ahead of the
celebration of the El Rocío pilgrimage in 2014) regular surveys were conducted along
the park routes traditionally used by the pilgrims, with the aim of locating nests of
wild avian species. In particular, our search was focused on colonial or semicolonial
breeding species including Black kites (Milvus migrans), Bee-eaters (Merops apiaster)
and White storks (Ciconia ciconia) because clumped nest aggregations would allow the
simultaneous quantification of wildlife behavior in a large sample of individuals while
concurrently assessing the amount of human presence during the pilgrimage.
Figure 4. The study area. The focal colony of white storks was located beside a field house known as "Palacio del Coto del Rey", which is once a year a major stopover and camp site for thousands of pilgrims in their route towards the town of El Rocio. The stork nests are therefore exposed to massive human presence during a short period (a few days per year). Automatic vehicle counters were placed along the dirt roads used by pilgrims, with the aim of assessing the spatiotemporal dynamics of human presence, potentially affecting the behavior and performance of white storks.
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This initial search resulted in the location of a colony of white storks (Figure 3)
near the "Palacio del Coto del Rey", a field house in the northern areas of the Doñana
Mab biosphere reserve (Figure 1). This field house is a major stopover site for pilgrims,
who traditionally parade along the front side of the house in their way towards the
town of El Rocío. The colony of white storks was composed of c.a. 40 active nests on a
group of trees located 30-100m from a major pilgrimage transit way, and c.a. 300
meters away from a camp site that is only used during this traditional event (Figure 4).
The reproductive phenology of the white storks in Doñana allowed us anticipating that
the adults in the study nests would be brooding nestlings during the estimated dates
of pilgrims passage.
In order to quantify temporal changes in human presence associated to the El
Rocio pilgrimage, we placed automatic vehicle counters (Figure 5; TRAFx Vehicle
Counter Generation III; http://www.trafx.net) beside the two dirt roads allowing
access to the study site.
Figure 5. Automatic vehicle counters. Automatic vehicle counters were placed in the dirt roads passing beside the study colony of white storks. The commercial magnetometers (TRAFx Vehicle Counter Generation III), and allow registering all vehicles passing within a 6m radius. The counters were buried in the ground to prevent avoidance of the sampling point by drivers. Photo credits: Julio Blas.
The automatic counters were buried in the ground 30 cm deep (to prevent
avoidance of the sampling point by pilgrims) and were active between May 30th and
June 13th, 2014. This period allowed us assessing the amount of human presence
affecting the study area before the start of the pilgrimage (i.e. between May 30th and
June 3rd) as well as during the pilgrimage towards the town of El Rocio (between June
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4th and June 8th), during the return of pilgrims from El Rocio (between June 9th and
10th) and after the pilgrimage ended (between June 11th and June 15th). In order to
assess the accuracy of automatic vehicle counters, we performed concurrent visual
censuses of passing vehicles during seven (N=7) 1-hour long intervals on June 4th.
In order to assess changes in avian behavior associated to human presence, a
few days before the start of the pilgrimage (on May 28th and 29th) we placed 16
compact, camouflage painted digital photo traps in a sample of 16 nests containing
storks nestlings (Figure 6).
Figure 6. Installing photo traps. After accessing the focal study nests, we placed compact, camouflage painted digital photo traps (red circles in left and central picture). The cameras were soon accepted by adult and nestling storks, allowing us to monitor behavior and subsequently relate changes in parental care to the temporal changes in human presence during the pilgrimage. The stork nestlings were banded with white plastic rings containing unique alphanumeric codes (right picture).
The cameras were activated by an automatic movement sensor set to capture
two photographs per movement during daylight hours (i.e. between 6:30 and 22:00h)
to maximize battery life. Nests were accessed with a motorized elevator (Haulotte
26M) and the storks chicks were banded with a white plastic ring coded with black
alphanumeric characters that allowed subsequent identification in the photographs.
The nestlings were also measured and weighted with the aim of estimating their age
and body condition. Nests were accessed a second time on June 3rd to collect the
photographic information recorded before the onset of the pilgrimage (i.e.
photographs taken between May 30th and June 2nd), replace the camera batteries
and the memory cards, and a third and last time on June 7th to collect the information
recorded during the main passage of pilgrims towards El Rocio (i.e. photographs taken
between June 3rd and June 6th). During the latter visit, nestlings were measured and
weighted a second time, mortality and predation events were recorded and the
photographic camera traps were removed from the nests.
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Figure 7. Schematic chronogram of the pilgrimage and associated field activities. (A) Calendar showing the date of celebration of the "White Dove" procession in the town of El Rocío (on June 8th 2014, highlighted in red), and the main transit periods of pilgrims through the Doñana MaB Biosphere reserve (in red: June 4th-7th comprise movements towards the town before the celebration, and June 9th-10th comprise movements from the town, after the celebration). (B) Dates when the automatic vehicle counters were recording the amount of motor transit beside the study colonies. Numbers in grey cells show preliminary data collected from one of the vehicle counters. (C) Dates when the photographic camera traps were recording storks´ behavior in the focal nests. Numbers in pink cells indicate the amount of pictures collected before and during the passage of pilgrims by the study area. (D) Dates when the stork nestlings were banded and the biometric information was recorded.
Figure 7 presents a schematic chronogram of the field activities performed
during the course of this research project, and some preliminary information including
estimates of the vehicles recorded by one of the vehicle counters, and the number of
pictures collected by camera traps. A visual inspection of the traffic data (Figure 7-B)
allows understanding the dramatic changes in human presence experienced by the
local storks. Daily traffic levels were very low before and after the pilgrimage (mean
11,1 vehicles/day; range 1-19), suggesting that the colony of storks is located in a
quiet, natural environment with negligible human presence. However, during the six
days of pilgrims passage, average traffic levels increased to 763,5 vehicles/day (range
354-1276). The actual impact of motorized traffic should be considerably higher
during the pilgrimage, as the preliminary data presented here only contains
information from one vehicle counter (data from the other counters is currently being
extracted for analyses). Furthermore, the information provided by automatic vehicle
counters only registered motorized entries to the study area (traffic regulations only
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allow one-way movements towards El Rocío), but the perturbation exerted by humans
should also consider the presence of walking people and horse riders, as well as the
permanence of all (vehicles, people and animals) in the camp site. These preliminary
numbers provide an initial approximation to the dramatic changes in human presence
that local storks experience during a few days.
Figure 8. Photographic sequence of a feeding event. (1) Upon arrival of an adult to the nest, the chicks (A and B in the example) perform a stereotypical begging display lowering their heads towards the centre of the nest and moving their wings rhythmically. (2) The adult responds elongating the neck, lowering the head and placing the open beak near the centre of the nest ground, with a visible red pouch. Nestlings may touch the adult beak during the begging display to stimulate regurgitation. (3) The adult regurgitates food on the ground of the nest. (4) Nestlings collect regurgitated food from the ground of the nest (nestlings do not feed directly from the beak of the adult). In the enlarged photographic insert, chick A is ingesting an American crayfish (Procambarus clarkii).
The information collected by the photographic cameras should allow us to
assess whether the focal storks modified their behavior in response to the pilgrimage.
During a four-day period prior to the pilgrimage, the photographic cameras collected
130911 pictures. Furthermore, 96007 additional pictures were collected during the
first three-days of pilgrims passage beside the focal stork colony (Figure 7-C). The vast
amount of information contained in this sample of over 220000 photographs is
currently being processed with the aim of extracting the number of feeding events
recorded each day in each of the focal nests. Feeding events are being identified in the
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collected pictures according to the stereotypical behavior displayed by adult and
nestling storks. As it is illustrated in Figure 8, the begging display of stork chicks
involves lowering the head towards the centre of the nest and moving the wings
rhythmically. If the adult responds to chick begging, we typically visualize it elongating
the neck, lowering the head and placing the open beak near the centre of the nest
ground with a visible red pouch. Feeding events are confirmed if the photographs
capture the adult regurgitating food on the ground of nest, and/or a nestling is
visualized ingesting food.
Figure 9. Photographic sequence of a showering event. Sometimes adults regurgitate water on top of their nestlings, allowing them drinking (straight from the beak of the adult or intercepting the stream of water) and wetting their plumage to cool them down (elevated temperatures are common in the study area).
The current screening of the photographs is also allowing an assessment of the
number of showers and drinking events recorded in the focal nests during the study
period (Figure 9). Adult storks provide water to nestlings for both drinking and wetting
their plumage, and this behavior also constitutes a type of parental care. In the
coming months, once the complete set of pictures has been visualized we will be able
to assess whether white stork in Doñana increase, decrease or maintain a similar level
of parental care in response to the massive presence of humans during the pilgrimage
towards El Rocio.
ACKNOWLEDGEMENTS
I thank Fernando Torres, Sebastián Palacios (Basti) and Sonia Cabezas for their
invaluable help to this project (Figure 10), specially for their contribution during field
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work activities and implementing the screening of the collected photographs. Javier
Chicano (Kiko), Francisco Hernández-Fernández and Alberto Herrero provided
technical support during field work (Figure 10) and allowed access to the stork nests.
Fabrizio Sergio, Francisco Carro, Eloy Revilla and Marcello D´Amico kindly provided
field materials and expertise. The staff of the Doñana National Park provided permits
to perform this research and information related to the pilgrimage. Part of this study
was funded by research project CGL2012-32544 of the Spanish Ministry of Economy
and Competitiveness and FEDER funds, and project 511/2012 of the Spanish Ministry
of Agriculture, Food and the Environment (Autonomous Organism of National Parks).
Julio Blas was supported by a Ramón y Cajal contract from the CSIC.
Figure 10. Study contributors. Some photos taken during the course of this study. (1) From left to right: Julio Blas and Sebastián Palacios (Basti) installing a photographic camera beside a nest of white storks containing two nestlings (visible in the lower right corner). (2) From left to right: Julio Blas, Fernando Torres and Sebastián Palacios (Basti) doing field work in Doñana. (3) From left to right: Julio Blas, Francisco Hernández, Sonia Cabezas, Fernando Torres, Sebastián Palacios (Basti), Francisco Chicano (Kiko) and Alberto Herrero at the Palacio del Coto del Rey (Doñana) during the course of this study.
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CITED LITERATURE
Aritio, Luis Blas. 2001. Doñana: the great lady of European nature. World heritage
review 22: 30-47
Dasmann, R. F. 1991. The importance of cultural and biological diversity. Pages 7-15 in
M.L. Oldfield and J.B. Alcorn: Biodiversity: culture, conservation, and
ecodevelopment. Westview Press.,Boulder, CO.
Ellis, Ramankutty 2008. Putting people in the map: anthropogenic biomes of the
World. Front Ecol Environ 6:439-447.
García Novo, Francisco and Marín Cabrera, Cipriano. 2006. Doñana: water and
biosphere. UNESCO-sponsored programmes and publications. Ministerio de
Medio Ambiente. Confederación Hidrográfica del Guadalquivir. Sevilla 365 p.
Madrid Action Plan for Biosphere Reserves (2008-2013). 2008. MAB official documents
Series. Ministerio de Medio Ambiente y Medio Rural y Marino. Organismo
Autónomo de Parques Nacionales. Madrid. 32 p.
Martinez Moreno, R.M. 1997. La Romeria del Rocio: una fiesta de la postmodernidad.
Gazeta de Antropología, 13 (5) 1-20
Mountfort, Guy. 1958. Portrait of a Wilderness: The Story of the Coto Doñana
Expedition. London: Hutchison. (Spanish versión 1994, edited by Patronato del
Parque Nacional de Doñana).
Naveh, Z. 1998. From biodiversity to ecodiversity - holistic conservation of the
biological and cultural diversity of Mediterranean landscapes. Ecological Studies
136: 23-53.
Ruiz de Larramendi, A. 2002. Do ana : a paradise for birds. UNESCO guides, World
heritage series. UNESCO Pub, Paris.
Spellerberg, I. F. 1998. Ecological effects of roads and traffic: a literature review.
Global Ecology and Biogeography 7(5): 317-333.
Velando, A. and I. Munilla 2011. Disturbance to a foraging seabird by sea-based
tourism: Implications for reserve management in marine protected areas.
Biological Conservation 144(3): 1167-1174.
Vitousek, P. M., H. A. Mooney, et al. 1997. Human domination of Earth's ecosystems.
Science 277(5325): 494-499.
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