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Gayana. Botánica

versión On-line ISSN 0717-6643

Gayana Bot. vol.73 no.1 Concepción jun. 2016

http://dx.doi.org/10.4067/S0717-66432016000100011 

STANDARD ARTICLES

 

Vascular flora in public spaces of Santiago, Chile

Flora vascular en el espacio público de Santiago, Chile

 

JAVIER A. FIGUEROA1*, SEBASTIÁN TEILLIER2, NICOLE GUERRERO-LEIVA3,4, CRISTIAN RAY-BOBADILLA3, SIMONÉ RIVANO2, DIEGO SAAVEDRA3 & SERGIO A. CASTRO3,4

1Centro de Estudios Arquitectónicos, Urbanísticos y del Paisaje, Facultad de Arquitectura, Urbanismo y Paisaje, Universidad Central de Chile. Avenida Santa Isabel 1186, Santiago, Chile.
2Escuela de Arquitectura del Paisaje, Universidad Central de Chile. Avenida Santa Isabel 1186, Santiago, Chile.
3Laboratorio de Ecología y Biodiversidad Vegetal, Departamento de Biología, Universidad de Santiago de Chile. Casilla 40, Correo 33, Santiago. Av. Lib. B. O’Higgins 3363, Santiago, Chile.
4Centro para el Desarrollo de la Nanociencia y Nanotecnología, CEDENNA, 917-0124 Santiago, Chile. Av. Lib. B. O’Higgins 3363, Santiago, Chile.

*E-mail: javier.figueroa@ucentral.cl


ABSTRACT

After an extensive two-year long research effort, the results document the diversity of vascular plants that grow in the public spaces of Santiago, Chile. We analyze the taxonomic composition, life-forms and phytogeographic origin of the vascular flora of Santiago and, finally, we compare the results with those of urban areas in the Northern Hemisphere. We identified 508 species, 100 families, and 338 genera. The families that showed the greatest richness were Asteraceae and Poaceae. We found that at least 85.1% of the species are exotic. The life-forms are similarly represented, although chamaephytes and geophytes are poorly represented. We conclude that the composition of the urban flora of Santiago differs from that of most Northern Hemisphere cities, due to the increased presence of exotic species, which is likely a consequence of the historical and cultural patterns of ornamentation. Therefore it is likely that this urban area would be an adverse environment for the establishment and development of native species.

KEYWORDS: Central Chile, exotic plants, native plants, plant diversity, urban flora.


RESUMEN

Los resultados documentan la diversidad de plantas vasculares que se desarrollan en el espacio público de Santiago en una investigación que se prolongó por dos años. Nosotros analizamos la composición taxonómica, la forma de vida y el origen fitogeográfico de la flora vascular y, finalmente, comparamos los resultados con aquellos de áreas urbanas del Hemisferio Norte. Se reconocen 508 especies, 100 familias y 338 géneros. Las familias que tienen mayor riqueza fueron Asteraceae y Poaceae. El 85,1% de las especies son exóticas. Las formas de vida están similarmente representadas, aunque las caméfitas y las geófitas están muy poco representadas. Concluimos que la composición de la flora urbana de Santiago se distingue de la mayoría de las ciudades del Hemisferio Norte por el mayor número de especies exóticas, que es probablemente una consecuencia de los patrones históricos y culturales de ornamentación, al tiempo que los espacios urbanos parecen representar un ambiente adverso para el establecimiento y desarrollo de especies nativas.

PALABRAS CLAVE: Chile central, plantas exóticas, plantas nativas, biodiversidad de plantas, flora urbana.


 

INTRODUCTION

Cities are biodiversity centers that contain native and exotic plants in variable proportions (Kowarik et al. 2013, Pyšek 1998). Due to the multiple ecosystem services provided by urban biodiversity, and particularly, plants (i.e. decontamination, aesthetic, recreational, native biotic, and soil conservation), there has been a recent increase in studies on urban flora (Kowarik 2011, Gong et al. 2013, Kowarik et al. 2013).

Most studies analyzing the diversity of urban flora have been carried out in cities in the Northern Hemisphere, particularly in Europe and the United States (Burton 1983, Klotz 1990, Godefroid 2001, McKinney 2002, 2006, Chocholoušková & Pysek 2003, Celesti-Grapow et al. 2006, Ricotta et al. 2009, Kowarik et al. 2013). These studies indicate that most of the flora in these cities are native species, representing approximately 60 to 40% of species present (Ricotta et al. 2009). Native richness within these cities has favored comprehensive conservation strategies (Sukopp & Werner 1983, Pyšek 1998, Kühn et al. 2004, Celesti-Grapow et al. 2006, La Sorte & McKinney 2006).

Studies on the flora and vegetation of urban areas in South America and, particularly in Chile, have been rather scarce (Cursach et al. 2012). However, there have been a few studies undertake in Chilean cities on such topics as: vegetational cover studies (Reyes-Paecke & Meza 2011, De la Barrera et al. 2011), conservation of native flora and fauna species (Díaz & Armesto 2003, Romero et al. 2001, Pauchard et al. 2006), the importance of social and economic factors in determining the value of vegetational cover (Romero et al. 2007, Hernández et al. 2007, Escobedo et al. 2008), the effects of pollen on human health (Rojas et al. 1999, Ibañez et al. 2001), and on the role of vegetational patterns in territorial planning (Romero et al. 2007). However, as far as we know, there are only two studies on the diversity of urban plants: Hoffmann (1998) and Alvarado et al. (2013). Thus, a central question remains: which vascular plant species grow in the capital city of Chile, and what is the proportion of native flora compared to the total number of species?

Based on evidence available in the published literature, this study hypothesized that exotic species are dominant in vascular flora in the public spaces of Santiago, Chile. After an extensive two-year long research effort, the results document the diversity of vascular plants that grow in Santiago’s public spaces. Specifically, we analyzed the taxonomic composition, Raunkiaer’s life-form, and the phytogeographic origin of the plant species and, finally, we compare the results with those of urban areas in the Northern Hemisphere.

MATERIALS AND METHODS

STUDY SITE

The city of Santiago, the capital of Chile (33°27′00″ S 70°40′00″ W; 500 masl), has a mediterranean-type climate. It was founded by the Spaniards in 1541. Today it covers an area of approximately 15,400 km2 and concentrates more than 6 million inhabitants (approximate density: 393 inhabitants/km2)1. Thus, it is one of the most densely concentrated urban areas in Latin America.

SAMPLING

To evaluate the floristic composition we established 200 random sites in public spaces of 35 communes within the city of Santiago (Fig. 1). These sites were georeferenced and visited between August and December in 2012 and again in 2013. At each site we placed a transect (100 m in length by 1 - 3 m in width). For each species recognized we assigned the taxonomic category and phytogeographic origin according to Marticorena & Quezada (1985), Matthei (1995), and Zuloaga et al. (2009). Several specimens were only determined at the genus level, thus they were not included in the analisys.

1URL: http://www.ine.cl/canales/chile_estadistico/familias/demograficas_vitales.php Viewed: May 4, 2015.

Species origins were classified as either native flora present in Chile prior to Spanish colonization or exotic flora that arrived afterwards. The categories presented by Raunkiaer (1934), as modified by Govaerts et al. (2000), were used to assign the life-form of each plant species: phanerophytes (have stems that are woody and persistent, and buds that are normally exposed 3 m or more above ground level), Nanophanerophytes (have stems that are woody and persistent, and buds typically located between 0.5 m and 3 m above ground level), chamaephytes (have stems that are herbaceous or woody and persistent, and have buds that are located above soil level, but never by more than 0.5 m), hemicryptophytes (have herbaceous stems that often die-back during unfavourable seasons, and surviving buds placed on (or just below) soil level), terophytes (complete their entire life-cycle during the favourable season, and survive the unfavourable season as a seed), and geophytes (have stems that die back during unfavourable seasons, with the plant surviving as a bulb, rhizome, tuber or root bud).

The original distribution of the exotic flora collected in urban public space in Santiago, was determined consulting several sources (Tutin 1964-1983, Hoffmann 1998, Matthei 1995, Kuhn 2004). Thus, Euroasian origin includes Europa, near East and Mediterranean coast of Africa. American, African and Oceanian include original distribution from the respective continent. Asian origin includes species with distributional area on eastern Asia.

The collected specimens were deposited in the Laboratorio de Ecología y Biodiversidad Vegetal at the Universidad de Santiago de Chile.

RESULTS

At the 200 sites, we recognized 508 species, 100 families and 338 genera (Table I). Plants were determined at species level, and assigned to a taxonomic category as follows: Division Magnoliophyta (96.5% of the species) and Pinophyta (3.5% of the species). The four most diverse families within the urban flora of Santiago were as follows: Poaceae (54 species), Asteraceae (50 species), Fabaceae (36 species), and Rosaceae (31 species).

With respect to phytogeographic origin, 76 plant species were native to Chile (14.9% of the identified origins), whereas that 432 were exotic (85.1% of the identified origins). Within the exotic taxa the most common original distribution was Euroasian, representing 28.5% of the total (Table II), American (17.8%), Asian (16.0%), and African (10.9%). Other distributional origins had representation < 10% (Table II); 11 exotic species were hybrids and considered with undetermined origin (Table II).

The most common life-forms was phanerophytes (137 species, Table III). Among these, 115 (83.9%) were exotic and 22 (16.1%) were native. Of particularly importance was the presence of endemic species such as: Aextoxicon punctatum Ruiz et Pav., Beilschmiedia berteroana (Gay) Kosterm., and B. miersii (Gay) Kosterm. The abundance of the following native phaneropytes was noteworthy: Quillaja saponaria Molina and Senna candolleana (Vogel) H.S. Irw.

 


FIGURE 1. Location of the communes containing 200 study sites at Santiago, Chile. The communes of Santiago are showed. 1= Quilicura (4), 2= Huechuraba (3), 3= Vitacura (4), 4= Lo Barnechea (3), 5= Pudahuel (6), 6= Renca (6), 7= Conchalí (7), 8= Independencia (3), 9= Recoleta (7), 10= Las Condes (11), 11= Cerro Navia (4), 12= Lo Prado (4), 13= Quinta Normal (8), 14= Estación Central (7), 15= Santiago (9), 16= Providencia (8), 17= Ñuñoa (9), 18= La Reina (7), 19= Maipú (15), 20= Cerrillos (6), 21= Pedro Aguirre Cerda (5), 22= San Miguel (2), 23= San Joaquín (6), 24= Macul (4), 25= Peñalolén (8), 26= Lo Espejo (5), 27= La Cisterna (4), 28= San Ramón (3), 29= La Granja (5), 30= La Florida (7), 31= Padre Hurtado (1), 32= San Bernardo (4), 33= El Bosque (4), 34= La Pintana (5), 35= Puente Alto (6). Number of study sites sampled per commune are shown in parentheses.

FIGURA 1. Ubicación de las comunas que contienes los 200 sitios de estudio en Santiago de Chile. Las comunas de Santiago son señaladas. 1= Quilicura (4), 2= Huechuraba (3), 3= Vitacura (4), 4= Lo Barnechea (3), 5= Pudahuel (6), 6= Renca (6), 7= Conchalí (7), 8= Independencia (3), 9= Recoleta (7), 10= Las Condes (11), 11= Cerro Navia (4), 12= Lo Prado (4), 13= Quinta Normal (8), 14= Estación Central (7), 15= Santiago (9), 16= Providencia (8), 17= Ñuñoa (9), 18= La Reina (7), 19= Maipú (15), 20= Cerrillos (6), 21= Pedro Aguirre Cerda (5), 22= San Miguel (2), 23= San Joaquín (6), 24= Macul (4), 25= Peñalolén (8), 26= Lo Espejo (5), 27= La Cisterna (4), 28= San Ramón (3), 29= La Granja (5), 30= La Florida (7), 31= Padre Hurtado (1), 32= San Bernardo (4), 33= El Bosque (4), 34= La Pintana (5), 35= Puente Alto (6). En paréntesis se señala el número de sitios de estudio muestreados por comuna.

 

TABLE I. Number of families, genera, and species identified (N and %) by taxonomic division of the urban flora in public space of Santiago, Chile.

TABLA I. Número de familias, géneros y especies identificadas (N y %) por división taxonómica de la flora urbana en el espacio público de Santiago, Chile.

 

TABLE II. Original distribution of the exotic flora collected in public space in Santiago, Chile.

TABLA II. Distribución de origen de la flora exótica colectada en espacios públicos de Santiago, Chile..

 

TABLE III. Life form and origin of the exotic flora collected in public space in Santiago, Chile. Frequency (N) and percentage (%) for each life form are indicaded.

TABLA III. Forma de vida y origen de toda la flora urbana colectada en espacios públicos de Santiago, Chile. Se señala la frecuencia (N) y el porcentaje (%) para cada forma de vida.

 

Aristolochia chilensis Bridges ex Lindl., Loasa triloba Dombey ex Juss, and Oxalis rosea Jacq. Nanophanerophytes were represented by a sizable group of 101 species (Table III). Among these 86 species were exotic, and 15 native (e.g. Colliguaja odorifera Molina, Escallonia illinita C. Presl, Fuchsia magellanica Lam., and Luma chequen (Molina) A. Gray). Another important group consists of hemicryptophytes, among which 107 were exotic (84.1%) and 17 were native, including Dysphania ambrosioides (L.) Mosyakin & Clemants, Festuca acanthophylla E. Desv., and Pasithea caerulea (Ruiz. et Pav.) D. Don. We identified 21 exotic chamaephytes and 4 native chamaephytes, including Carpobrotus chilensis (Molina) N. E. Br., Fragaria chiloensis (L.) Mill., and Sphaeralcea obtusiloba G. Don. Finally, we identified 7 geophytes, of which 1 were native (Table III): Oxalis arenaria Bertero.

 

DISCUSSION

According to our results, the composition of the urban flora of Santiago differs from that of most Northern Hemisphere cities in terms of the greater representation of exotic species (Burton 1983, Klotz 1990, Godefroid 2001, McKinney 2002, 2006, Chocholouskova & Pyšek 2003, Celesti-Grapow et al. 2006, Ricotta et al. 2009, Kowarik et al. 2013). The scarce representation of native species in Santiago suggests that this urban area may be an adverse environment for the establishment and development of their individuals. It is noteworthy that some native plants, such as Aextoxicon punctatum Ruiz. et Pav., Beilschmiedia spp. and Fuchsia magellanica Lam., were planted for ornamental or urbanistic purposes and there is no evidence that they grow spontaneously. In fact, during the colonial period of Chilean history and the 19th century, Santiago was ornamented using exotic trees, following the model of European parks and gardens, and native species were scarcely used during 20th and 21st century (Serra et al. 2002, Hoffmann 1998, Alvarado et al. 2013).

This study shows that in Santiago’s public spaces exotic plant species are more common than native species. In contrast, in diverse patches of vegetation in central Chile, the richness of exotic species is rarely greater than native ones (Teillier et al. 2010). The origins of the urban flora in Santiago are similar to that of plants found on the agricultural lands of central Chile, where exotic weeds represent about 80% of species (Figueroa et al. 2013). It is known that the successful establishment of exotic species is much more frequent in artificial habitats, and that they likely benefit from the high rate of anthropogenic disturbance and a large-scale removal of the natural habitat (Sukopp 2004, Figueroa et al. 2013, Gong et al. 2013).

Given these results, and due to the present social and cultural conditions, the idea of considering Santiago as a spot for the conservation of native species should be undertaken soon. In many cities there are organizations willing to allocate resources to conservation and education efforts (Figueroa et al. 2011). Thus, the role of both private and public agencies needs to be coordinated in order to empower organizations within civil society.

Green spaces can be opportunities for ex-situ conservation and environmental education, while at the same time collaborating for efficient use of water and reducing the atmospheric pollen load (Rojas et al. 1999).

On the other hand, the predominance of Eurasian species seen in Santiago is consistent with the flora present in rural areas as well as with the overall flora of central Chile (Teillier et al. 2010). This is most likely a consequence of the high historical availability of Eurasian plants in the country (Figueroa et al. 2004). It is worth noting that African and Oceanic species represented the 15.1% of the species pool in Santiago, far higher that the 3% of species they represent in natural habitats of central Chile (Teillier et al. 2010). Clearly, African and Oceanic species require to be monitored, since various weeds and invasive plants currently commons in central Chile were initially introduced in Santiago during 19th century and later they spread spontaneously to rest of the country (Matthei 1995). Although our study constitutes a random sampling of diversity only in public spaces, studies that include private spaces are required because these form an important contribution to urban diversity that is usually neglected (Smith et al. 2006).

This is the first floristic study that we knowing the literature that considers the non-woody species in public space of Santiago. Although in Santiago the non-woody (mainly hemicryptophytes and therophytes) cover is lower than woody cover, this study demonstrates that species richness is similar in both. While a large proportion of therophytes have spontaneously established themselves in the diverse artificial habitats available in the city, phanerophytes, on the other hand were cultivated in the city and they need to be managed by municipal agencies. Nevertheless, the source of therophytes is diverse although we were not able to accurately determine, and their impact on urban activities within Santiago has not yet been evaluated.

Nowadays there is an agreement that cities are not internally homogeneous structures, they are typically characterized by a wide ranging spatial and temporal heterogeneity caused by cultural, socio – economic and environmental patterns particular to each town (Gilbert 1989, Kowarik 1995, Kinzig & Grove 2001, Pickett et al. 2001, Barbosa et al. 2007, Sánchez & Bonilla 2007, Marco et al. 2010). There is a growing need of more research in order to determine the causes that are responsible for the current patterns of diversity in species composition and abundance of the urban flora of Santiago.

ACKNOWLEDGEMENTS

This study was financed by the "Fondo Interno de Investigación, Universidad Central de Chile", and "Programa Regular de Investigación CEAUP". S.A.C. thank financial support of Center for the Development of Nanoscience and Nanotechnology CEDENNA FB0807 (Línea 6), DICYT 021543CM and Proyecto USA1498.04 of the Universidad de Santiago de Chile.

 

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ANNEX 1. Urban flora collected in the public space of Santiago, Chile.

ANEXO 1. Flora urbana recolectada en los espacios públicos de Santiago, Chile. .

(Please check the PDF of this article to see this table in Annex)

(Por favor revisar el PDF de este artículo para ver la tabla del anexo)

 


Recibido: 01.08.14
Aceptado: 10.09.15

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