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Research ArticleArticles

Avian Ecological Diversity as an Indicator of Urban Forest Functionality. Results from Two Case Studies in Northern and Southern Italy

Giovanni Sanesi, Emilio Padoa-Schioppa, Leonardo Lorusso, Luciana Bottoni and Raffaele Lafortezza
Arboriculture & Urban Forestry (AUF) March 2009, 35 (2) 80-86; DOI: https://doi.org/10.48044/jauf.2009.35.2.80
Giovanni Sanesi
Giovanni Sanesi, Università degli Studi di Bari, Dipartimento di Scienze delle Produzioni Vegetali, via amendola 165/a-70126, Bari, Italy
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Emilio Padoa-Schioppa
Emilio Padoa-Schioppa (Corresponding Author), Università degli Studi di Milano-Bicocca, Dipartimento di Scienze dell’Ambiente e del Territorio, Research Unit of Landscape Ecology, piazza della Scienza 1-20126 Milano, Italy,
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  • For correspondence: [email protected]
Leonardo Lorusso
Raffaele Lafortezza, Università degli Studi di Bari, Dipartimento di Scienze delle Produzioni Vegetali, via amendola 165/a-70126, Bari, Italy
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Luciana Bottoni
Leonardo Lorusso, Università degli Studi di Bari, Dipartimento di Scienze delle Produzioni Vegetali, via amendola 165/a-70126, Bari, Italy
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Raffaele Lafortezza
Luciana Bottoni, Università degli Studi di Milano-Bicocca, Dipartimento di Scienze dell’Ambiente e del Territorio, Research Unit of Landscape Ecology, piazza della Scienza 1-20126, Milano, Italy
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Abstract

Greenspaces and forest trees contribute to a number of environmental functions in urban environments, such as the survival of urban-dwelling species (e.g., bird species). This paper analyzes the relationship between greenspace characteristics (structural and spatial attributes) and the diversity of avian ecology species. This provides research findings coming from two studies conducted in Italy. Using point-count method, a quantification was done of the abundance and diversity of bird species in a number of greenspaces having different structural attributes (e.g., vegetation type, tree height) and spatial characteristics (e.g., location, connectivity). Results showed positive correlations between greenspaces with a more diverse and mature forest vegetation and the number of specimens and species observed in the two studies. A positive correlation appeared also between distance to the city centre and richness and abundance of bird species. Finally, we discuss some of the main implications for enhancing the functional attributes of greenspaces by using avian ecological indicators to inform ecologically sound urban planning and design.

Key Words
  • Urban Environments
  • Point-Counts
  • Urban Biodiversity
  • Forest Birds
  • Italy
  • Ecological Indicators
  • Urban Greenspaces

Greenspaces and forest areas are essential components of the urban environment because they provide a wide range of environmental and social functions to cities and urban dwellers (Costanza et al. 1997; Orians 1986; Padoa-Schioppa et al. 2007; Sanesi and Chiarello 2006). Increasing levels of urban densification are calling attention to those measures that can mitigate urban island effects (Mazza and Rydin 1997) or compensate for the overload of pollutants in (urban) air and soil (McPherson et al. 1994; Nowak et al. 2006). Citizens are also growing concerned over the the consequence of intense urbanization and its effects on their physical and/or psychological well-being (Van Herzele and Wiedemann 2003; Chiesura 2004; Sanesi et al. 2006). A healthy urban environment is often associated with the availability of large forest areas within cities and the accessibility of such areas by urban residents (e.g., Hartig 2004; Hartig and Cooper-Marcus 2006).

Forest trees are also essential for the survival of many animal and plant species in urban environments. In particular, studies have demonstrated positive effects of forest trees on both invertebrate and vertebrate species, such as spiders (Alaruikka et al. 2002), ants (Yamaguchi 2004), butterflies (Hermy and Cornelis 2000), carabides (Niemelä et al. 2002; Ishitani et al. 2003; Magura et al. 2005), and passerines (Wiens 1989; Keast 1990; Petty and Avery 1990; Mörtberg and Wallentinus 2000; Padoa-Schioppa et al. 2006; Ferrara et al. 2008). For example, Watts and Larivière (2004) showed how the presence of carabides in the urban environment could be explained by the size of green areas and the presence of indigenous forest species.

Highly dense urban areas with a lack of greenspaces and forest trees are often associated with the presence of generalist species nesting in hollow trees (Emlen 1974; Lancaster and Rees 1979; Beissinger 1982).

Although the influence of urban forests on species has been the focus of recent studies (Blair 1996), few contributions have explored the subject by considering the biological response of species to different types and structures of forest vegetation in urban environments. In this direction, this paper aims to explore the relationship between the urban forest structure and the abundance of certain bird species. We provide research findings coming from two studies conducted in Italy at northern (Milan) and southern (Bari) locations. At both locations, bird species were used as indicators of ecological diversity in urban environments (i.e., avian ecological diversity). Using point-count method, we quantified the abundance and diversity of bird species in a number of greenspaces of different structural attributes (e.g., vegetation type, tree height) and spatial characteristics (e.g., location, connectivity). We finally discussed some of the main implications for enhancing the functional attributes by selecting avian ecological indicators and use them to inform ecologically sound urban planning and design.

MATERIALS AND METHODS

Study Areas

This study was conducted on sixteen greenspaces located in two main urban environments: Milan, northern Italy (N. 13) and Bari, southern Italy (N. 3).

Greenspaces were opportunistically selected by considering the availability of supplementary data and information on forest species composition and structure at the year of their establishment as well as data on past and current forest management practices. Selection was also based on considerations on the extension of each city and the amount of (public) greenspaces available.

As a general figure, Milan (45°53′71′’N; 9°20′97′’E) extends to approximately 182 km2 (72.20 mi2) with a population of 1,303,602 inhabitants (ISTAT, 2005). This figure rises up to 3,900,000 inhabitants when including surrounding towns and villages. Overall, greenspaces in Milan covers a surface of 15.20 km2 (5.86 mi2); the average amount of greenspaces per capita is approximately 11.60 m2 (124.86 ft2; Agenzia Mobilità e Ambiente, 2002).

Bari (41°7′3″N; 8°32′55″E) extends to approximately 116.20 km2 (44.87 mi2) with a population 316,000 inhabitants. Public greenspaces cover a surface of 1.13 km2 (0.44 mi2) with 3.4 m2 (36.60 ft2) of greenspaces per capita (ISTAT, 2005).

Bird Species Survey

In each greenspace, we collected a number of data related to the richness and abundance of bird species. From March 2005 to July 2006, birds were observed and recorded during the breeding season by means of point-counts with unlimited distance (Bibby et al. 2000). “Point-counts” are a common method for sampling bird species (Bani et al. 2006) because it allows an extensive surveying of sample areas and the surrounding landscape (Blondel et al. 1970; Reynolds 1990). In addition, this method enables collecting a wide range of ecological data on species with a cost-effective balance (Selmi and Boulinier 2003).

In the study, birds were surveyed placing each sample within a grid of 250 m x 250 m while avoiding the overlapping of two continuous observations. Overall, 80 point-counts were covered during field campaigns. Among bird species surveyed in the two locations, two species were assumed as potential indicators of urban forest functionality: great tit (Parus major Linnaeus 1758) and the serin (Serinus serinus Linnaeus 1766). Both species were found in the two locations in more than 50 point-counts. Furthermore, great tit and serin are within the 15 target species described by the “atlas of birds” of Milan (Avium, 2006).

Species abundance for the two indicator species was expressed in terms of number of individuals per point-count (Bibby et al. 2000).

DATA ANALYSIS

As first step, we performed a cluster analysis using UPGMA method (Unweighted Pair Group Method using arithmetic Averages) which allowed comparing birds in terms of species composition over the sixteen greenspaces (Spellerberg et al. 1999).

In addition, we analyzed the structural and spatial characteristics of the sixteen urban greenspaces, such as: dimension in hectares, percentage of vegetation cover, and distance from the core center of the city (identified by the center of the polygonal area representing the city – see Table 1). These data were analyzed using a nonparametric test: “R-Spearman Coefficient” (due to the non-normal distribution of observations). Linear regression models were used to predict species richness on the basis of greenspaces’ characteristics.

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Table 1.

Synthetic park’s features. Forest cover (the area covered by trees) correlation was not evaluated in Lama Balice park, because the natural vegetation was populated with shrubs and not trees.

We measured the DBH [Diameter Breast Height, taken at 1.3 m (4.27 ft) above ground] of the closest 100 trees surrounding each point-count within a radius of 100 m (328 ft). DBH values were then analyzed in relation to species abundance values considering the following intervals of DBH: minimum, first quartile, median, third quartile, and maximum. Such intervals were used to derive input data for an additional regression model. For each DBH interval, we compared the observed species abundance with the average abundance across the 80 point-counts and used those observations with higher values to construct an “optimal” model of the DBH distribution. All the other observations were instrumental for creating a “minimal” model of this distribution. The “U-Mann-Whitney Test” was used for the scope. This approach has been used in previous studies (Massa et al. 2003a) and it follows the assumptions that: an high level of abundance is generally preferable for birds in urban settings (Bock and Jones 2004); that birds select forest with high values of DBH, mature urban forest; and that species in urban environments are likely to occur within heterogeneous and uneven-aged forest vegetation (Blair 1996; Donnelly and Marzluff 2006; Sandström et al. 2006).

RESULTS

Table 2 illustrates bird species diversity for each of the analyzed urban greenspaces. In total, 56 species were recorded: 53 species in Milan and 11 in Bari; and 4,393 specimens were indentified: 3,587 in Milan and 649 in Bari.

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Table 2.

Number of bird species identified and number of specimens detected in each greenspace.

The large part of these species are typical of forest-type habitat (Keast 1990; Hinsley et al. 1995; Massa et al. 2003b; Bani et al. 2006), such as: “wren” (Troglodytes troglodytes L.); “wryneck” (Jynx torquilla L.); “short-toed treecreeper” (Certhia brachydactyla C.L. Brehm 1820); “golden oriole” (Oriolus oriolus L.); “jay” (Garrulus glandarius L.); and “great spotted woodpecker” (Dendrocopos major L.). Other species are common in farmlands and hedgerows (Chamberlain and Fuller 2001; Gregory et al. 2001; Padoa-Schioppa 2006), such as: “stonechat” (Saxicola torquata Linnaeus 1766); “red-backed strike” (Lanius collirio L.); “melodius warbler” (Hippolais poliglotta L.). Most of the remaining species are without specific requirements in terms of habitat and could be defined as generalist species (Hagemeijer and Blair 1997; Tomialojć, 1998; Jedicke 2000; Massa et al. 2004), such as: “feral pigeon.” (Columba livia, Gmelin, 1789); “hooded crow” (Corvus corone cornix, L.); “starling” (Sturnus vulgaris, L.); “italian sparrow” (Passer domesticus X italiane, L.).

Water–bird species were also identified because of the presence of ponds and artificial lakes in some of the analyzed greenspaces (e.g., Parco delle Cave in Milan): little grebe (Tachybaptus ruficollis); great crested grebe (Podices cristatus); and little bittern (Ixobrychus minutus). All these species have an interest in terms of habitat conservation in urban and periurban environments (Massa et al. 2004).

Through the UPGMA Cluster Analysis, we classified the 16 greenspaces into 3 main clusters or groups (Figure 1), such as: (1) the three largest greenspaces of Milan (Parco Nord, Parco delle Cave, Bosco in Città); (2) the three greenspaces in Bari (Lama Balice, Parco 2 Giugno, Giardini di Piazza Umberto); and (3) the remaining 10 greenspaces in Milan (Milano Trenno, Milano Sempione, Milano Monte Stella, Milano Montanelli, Parco Ravizza, Parco Solari, Milano Forlanini, Giardini Via Pallavicino, Milano Lambro). These clusters of greenspaces (inter-group) showed similar characteristics inside the group (intra-group).

Figure 1.
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Figure 1.

Cluster analysis. See Table 1 for greenspaces’ names.

Figure 2 illustrates the results of the regression analysis which considered the main characteristics of urban greenspaces as independent variables, and species richness as dependent variable (expressed as number of bird species). A high correlation emerged between “species richness” and “distance from the city” and between “species richness” and “amount of forest tree cover.” These findings are consistent with other studies, e.g., Gilbert (1989), Jokimäki (1999), Hostetler and Holling (2000), Melles et al. (2003), Blair (2004).

Figure 2.
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Figure 2.

Spearman correlation coefficient and regression analysis for number of species and area of the greenspace. Forest cover is the area covered by trees.

Figure 3 (Mann-Whitney U-test) illustrates the levels of abundance for the two indicator species (great tit and serin), based on DBH values (minimum, first quarter, median, third quarter and maximum). In the case of “serin,” when DBHmin > 8 cm; DBH1st quarter > 20 cm; DBHmedian > 30 cm; DBH3rd quarter > 40 cm, species abundance gets significantly higher than the one measured at lower level of DBH (see: Mann-Whitnay U-test, in Figure 3). In the case of the “great tit,” DBHmax was the only interval providing significant results. The resulting regression curve for the “great tit” revealed a positive correlation between DBH and species abundance: the higher the tree diameter the higher the abundance of the species. This could be explained by the habitat preference of the great tit for large trees (Cowie and Hinsley 1988). The regression curves predicting the mimimal and optimal distribution of DBH for great tit and serin are reported in Figure 4. Such equations could be used to design an “ideal” structural model of forest stands in urban environments supporting avian species diversity.

Figure 3.
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Figure 3.

Tree structure and abundance of serin and great tit.

Figure 4.
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Figure 4.

Regression equations for tree.

DISCUSSION AND CONCLUSIONS

In urban settings, bird species are important indicators of environmental quality and ecological functionality. At urban scale, the study of bird species in relation to greenspaces characteristics is essential to better understand the current status of urban forest resources and related functions as well as to monitor progresses towards urban sustainability.

In this study, we provided evidence on the response of bird species to certain structural attributes of greenspaces, such as the presence of mature and heterogeneous forest stands (high level of DBH). Among the analyzed greenspaces, Parco Nord (Milan) provided the most encouraging results in terms of species richness. Such results could be explained by: the large extension covered by this greenspace (approximately 600 ha), the high percentage of mature forest trees, and the relevant distance to city center (Sanesi et al. 2007).

Besides these characteristics, it is important to consider the spatial connectivity of greenspaces with the surrounding landscape components, especially forest patches, open spaces, grasslands and mixed-croplands with presence of hedgerows (Sodhi et al. 1999; Farina 2006). For example, Giardino di via Pallavicino, Parco Solari and Giardino di via Ravizza in Milan although having approximately the same extension (16 ha) revealed a contrasting patterns in terms of species richness (see Table 3). This could be explained by the fact that Giardino di via Pallavicino and Parco Solari belong to a system of parks and other greenspaces (public and private lands) which constitutes a kind of ecological network supporting bird species dispersal.

In synthesis, this study provided the following caveats:

  • 1) The dimension of greenspaces and the amount of tree cover are critical factors supporting avian ecological diversity in urban environments. As a consequence, urban forest planners and managers should promote the planning and design of large greenspaces within cities and the connection of greenspaces with the surrounding landscape elements.

  • 2) The structural heterogeneity of forest trees within greenspaces (explained by the DBH analysis) is a fundamental aspect supporting high level of species abundance of birds.

  • 3) The conservation of species diversity in urban areas should be based on the knowledge on one or more indicators species having different habitat requirements in terms of vegetation and trees’ structure (as explained by Ficetola et al. 2007).

The results of our work suggests that following the approach of ecosystem services and the “Biophilia hypothesis” (Costanza et al. 1997; Wilson 1984) a greenspace in urban areas should be managed for both social needs and conservation purposes.

Acknowledgments

The research was financed by Ministry of the Instruction of the University and the Research inside Program of Research of Interest National (PRIN-2004).

The research was coordinated by Giovanni Sanesi; data analysis and experimental design was performed by Emilio Padoa-Schioppa; Leonardo Lorusso and Raffaele Lafortezza were responsible for Bari and Luciana Bottoni and Emilio Padoa-Schioppa for Milano.

  • Copyright © 2009, International Society of Arboriculture. All rights reserved.

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Arboriculture & Urban Forestry (AUF): 35 (2)
Arboriculture & Urban Forestry (AUF)
Vol. 35, Issue 2
March 2009
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Avian Ecological Diversity as an Indicator of Urban Forest Functionality. Results from Two Case Studies in Northern and Southern Italy
Giovanni Sanesi, Emilio Padoa-Schioppa, Leonardo Lorusso, Luciana Bottoni, Raffaele Lafortezza
Arboriculture & Urban Forestry (AUF) Mar 2009, 35 (2) 80-86; DOI: 10.48044/jauf.2009.35.2.80

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Avian Ecological Diversity as an Indicator of Urban Forest Functionality. Results from Two Case Studies in Northern and Southern Italy
Giovanni Sanesi, Emilio Padoa-Schioppa, Leonardo Lorusso, Luciana Bottoni, Raffaele Lafortezza
Arboriculture & Urban Forestry (AUF) Mar 2009, 35 (2) 80-86; DOI: 10.48044/jauf.2009.35.2.80
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Keywords

  • Urban Environments
  • Point-Counts
  • Urban Biodiversity
  • Forest Birds
  • Italy
  • Ecological Indicators
  • Urban Greenspaces

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