Comparison of Nesting Features and Breeding Success of Turtle Dove <i>Streptopelia turtur</i> between Orchards and Riparian Habitats

Mansouri, Ismail; Squalli, Wafae; El Agy, Abdelbari; El-Hassani, Abderahim; El Ghadraoui, Lahcen; Dakki, Mohamed

doi:https://doi.org/10.1155/2021/5566398

International Journal of Zoology

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Abstract Introduction Materials and Methods Results Discussion Conclusion Data Availability Conflicts of Interest Acknowledgments References Copyright Related Articles

Research Article | Open Access

Volume 2021 | Article ID 5566398 | https://doi.org/10.1155/2021/5566398

Comparison of Nesting Features and Breeding Success of Turtle Dove Streptopelia turtur between Orchards and Riparian Habitats

Ismail Mansouri,¹Wafae Squalli,¹Abdelbari El Agy,¹Abderahim El-Hassani,¹Lahcen El Ghadraoui,¹and Mohamed Dakki²

Academic Editor: Marco Cucco

Received29 Jan 2021

Revised21 Mar 2021

Accepted29 Mar 2021

Published08 Apr 2021

Abstract

The European turtle dove Streptopelia turtur breeds in both farmlands and woodlands, and it is important to explore the difference in breeding ecology of this threatened game in these two ecosystem types. This study, carried out during four years (2015–2018), compares nesting features of this species and its breeding success between apple orchards and riparian vegetation in Midelt Province, Morocco. The main result revealed that the nest placement, including nesting-tree height and nest height, is similar between orchards and riparian trees. However, the nest dimensions (big and small diameters) were larger in orchards. Correlations were variable among nest placement parameters and dimensions. On the contrary, in four breeding seasons, where 566 nests were monitored (467 in orchards and 99 in riparian sites), the average breeding success was different (57% of chicks in apple farms and 53% in riparian vegetation). Moreover, in apple orchards, clutches’ failure is due to both predation (18.89% of eggs and 10.54% of chicks) and temperature lowering (5.03% of unhatched eggs and 5.49% of dead chicks), while in riparian vegetation, the loss is due to nest desertion (21.33% of clutches) and mostly predation (33.16% of clutches).

1. Introduction

The European turtle dove Streptopelia turtur is among birds that have dramatically declined in Europe (−78% in Britain between 1980 and 2013, as well as −70% in Spain between 1980 and 2017) [1]. Consequently, it has been classified as “Near Threatened” within the European countries and “Vulnerable” throughout Africa and Europe, following recent evaluation [2]. Potential factors responsible for the species’ decline include breeding habitat degradation [3], reduction of food availability due to agricultural intensification [4, 5], hunting, and variation in ecological conditions throughout the migration flyway [5–7].

In Northwestern Africa, the turtle dove is a common breeder and summer migrant [8–10]. It has an important breeding population in Morocco [11], largely dispersed in forest ecosystems [12, 13] that represent 12.7% of the national territory [14] and farmlands representing 1.5% [11] of the total land area. In agricultural lands, they are more frequent in farm landscapes with irrigated perimeters [10, 15–19], including olive, orange, and apple orchards being particularly favoured [15, 18–20]. Similarly, in Algeria, the turtle dove is distributed over a wide area of the northern part of the country and over the palm oases and groves in the south [21–23]. On the contrary, in Tunisia, where this species is less studied, rare information exists on its breeding and foraging ranges [24].

Most studies of the turtle dove on both European and North African populations have focused on farmland habitats, involving breeding biology [3, 19–22], habitat use [3, 4, 7, 25–28], foraging [4, 18, 29–31], and migration [32–34]. In natural forests, studies were mainly limited to habitat use [27, 35–39] and feeding resources [31, 37]. Moreover, no breeding comparison has been carried out between wild and farmland habitats in both Europe and Africa, and this justifies the crucial need to analyse the situation of turtle doves in both woodlands and agricultural habitats.

This study, carried out in the high Moulouya valley at altitudes of 1300–1600 m (Midelt region, Morocco), aims to compare nesting features (nest placement and dimensions) and breeding success of the turtle dove in farmlands (apple orchards) and wild habitats (riparian vegetation) and to identify the most impacting factors of the turtle doves’ reproduction in these two types of habitats.

2. Materials and Methods

2.1. Study Area

This study was carried out in the upper valley of Moulouya, in Midelt region, located between the Middle Atlas in the northeast and High Atlas Mountains in the north (Figure 1). This area is characterized by a cold arid climate (the annual average temperature and precipitation being about 29°C and 89 mm successively) with a mountainous tendency, and the rainfall regime is marked by high seasonal variations, with low rainfall and stormy precipitation [40, 41].

Two zones were selected for this study: (1) Ansegmir Valley (32°38′20.29″N, 4°59′26.89″W), in Ait Ayach area, at the foot of the El Ayachi Mountain, and (2) Tabelkhirt Valley (32°42′29.28″N, 5°7′10.10″W) in Imzil area. Twenty apple orchards were selected as farmlands (Ait Ayach and Moulouya), and eighteen line transects were selected at Ansegmir and Tabelkhirt rivers. Moreover, apple orchards and riparian habitats were selected jointly to avoid any potential difference in climate conditions or geographic location that could influence our nesting parameters, and this will allow a better comparison between the two sites.

2.2. Data Collection

We systematically searched for nests from early March to late August between 2015 and 2018, using parental behavioural cues and Common Bird Census (CBC) methodology [42]. In our case, this methodology was adopted inside apple orchards, where nests or breeding pairs were actively searched along the whole tree lines of the apple orchards [19]. In the riparian vegetation, we used line transects [18], and nests were searched side by side of the river banks. These prospections were carried out during the nest construction period, generally between 06:00 h and 18:00 h. To determine the laid eggs, hatched nestlings, and survived chicks, each nest was visited weekly until it failed or chicks fledged. Moreover, breeding success, including hatched egg’s rate (100 × hatched eggs/all laid eggs) and flying chick’s rate (100 × chicks leaving their nests/fledged chicks), was calculated in percentage [10]. In parallel, along with each breeding season, failure factors were recorded, based on carcasses and other signs, such as the status of the nest and feathers inside or outside the nest. Moreover, after chicks leave, each nest was characterized, in terms of placement, including nesting tree, nest height (NH), and nesting-tree height (NTH), as well as in terms of dimensions (big diameter-NBD and small diameter-NSD) and nest depth (ND). Furthermore, the location of each nesting tree was referenced using a mobile GPS and then reported in open-source GIS (Quantum GIS v1.7.3). Finally, distances between dove’s nests and the nearest human farms (mainly cereals), the nearest water source, and the nearest road were measured with QGIS in order to explain any potential difference in studied parameters.

2.3. Statistical Tools

Statistical analyses were performed in Statgraphics Centurion software, version XVI. I. Before running the statistical analysis, we checked for normality and homogeneity of variance for all variables with the Kolmogorov–Smirnov test. To assess differences in nest placement and dimension between orchards and riparian sites, we used the independent t-test, considering the two sites as unrelated ecosystems. Similarly, breeding success, including nesting, laying, and fledging survival, was analysed with the t-test. In addition, correlations among nest placement and nest dimension parameters were tested with Pearson’s correlation coefficient. Results were given as sample size and mean ± SD.

In order to investigate the relevance of distance to neighboring human farms (cereals), to neighboring water plants, to neighboring nests (of other turtle doves), and to neighboring roads as predictors of fledging probability (response variables: 0 (no fledglings produced by eggs’ predation or nest abandonment) and 1 (at least one fledgling produced)), a model with a binomial error structure and log it link function was applied.

3. Results

3.1. Nest Placement and Dimensions

During the whole study period (2015 to 2018), a total of 566 turtle dove nests were found, among which 467 were only in apple orchards and 99 in diverse riparian supports. In fact, 55 nests were found on wild rose (Rosa canina), 37 nests on hawthorn (Crataegus azarolus), three on Tamarix sp., one on Salix sp., one on poplar, and one on blackberry (Rubus fruticosus) (Figure 2).

The t-tests conducted on nest placement characteristics of turtle dove Streptopelia turtur showed that the nest height (NH) and the nesting-tree height (NTH) were similar between orchards and riparian breeding habitats (Table 1). On the contrary, the nest dimensions (NBD and NSD) were significantly larger in orchards compared to those in riparian habitats, while the nest depth was the same in the two habitats.

Correlation was variable among nest placement parameters (nest height and nesting-tree height) and nest dimensions (nest big diameter, nest small diameter, and nest depth) in studied habitats (Table 2). At riparian sites, the NSD and the NBD were significantly correlated, as well as the NSD and ND parameters, while at orchard habitats, only NSD and NH were significantly correlated, as well as NH and NTH. On the contrary, the other parameters were uncorrelated at both studied habitats.

3.2. Breeding Success

We recorded a total of 566 turtle dove nests during the entire three years between 2015 and 2018. Among the monitored nests (Table 3), only 73.87% were succeeded at orchards, compared to 53.35% at riparian habitats. During the incubation phase, fledging success was higher in orchards, compared with river vegetation. However, during the rearing period, the success rates were the same in the two sites. Failure factors were also variable between these habitats. In orchard habitats, predation, nest abandonment, and nonhatching presented the most threats menacing turtle dove breeding success, while in riparian sites, predation, nest desertion, and nest destruction dominated all failed clutches.

In riparian habitats, broods located at longer distance from human farms, mainly cereals, are less likely to produce fledglings. The fledging probability significantly increased as distance to water plants or roads was longer. No relationship was found between fledging probability and distance separating broods to neighboring nests (Table 4), while in orchards, all analysed factors were not influencing breeding success because nests were recorded inside human farms, and water sources were a few meters or less inside apple farms (irrigation systems of farms).

4. Discussion

In the Mediterranean region, the turtle dove uses mostly farmlands (olive, orange, apple trees, etc.) as breeding sites [10, 11, 19]; but, this bird has also more or less preference for different native trees as the nesting support. The riparian vegetation was only recently revealed as favourable breeding habitat for the turtle dove in Italy [43]. Our findings confirm the results of this study and provide comparison between farmlands and woodlands as breeding habitats for this bird.

The abundance of nesting trees (apples in orchards and wild rose, Salix, and Tamarix in river banks) and water sources (irrigated orchards and stream water) and the availability of large cereal fields [11] explain the high incidence of nesting turtle doves in these both habitats [18, 41]. Nevertheless, the fact that the nesting incidence of doves is higher in orchards than in riparian sites does not indicate a particular attraction, but reflects, particularly, their abundance (apples) in the study area in comparison with less-abundant riparian vegetation [18, 19, 41].

The use of high nest placement and taller nesting trees by the species, in both orchards and riparian vegetation, ensures a better protection of its nestling from ground threats (terrestrial predators and human disturbance), mainly in farmlands [19]. Indeed, the nest height is reported to promote greater breeding success of turtle doves in different North African habitats, including Morocco and Algeria [19, 44, 45]. Therefore, turtle doves select taller nesting trees mainly to elevate their nest placement [35]. On the contrary, nests are particularly large in orchards, similar to the results reported in olives in Northwest Algeria [45], with, however, more nest variations depending on habitat types. More generally, a high variability in nest morphology was noted [46] depending on available nesting materials, which are suggested in our study to be the main factor controlling the difference observed in nest morphology.

Our monitoring showed, in the four breeding seasons, different breeding success rates in farmlands and riparian habitats (Table 2). In summary, 73.87% of nests, 71.16% of eggs, and 79.56% of chicks survived in orchards, while only 53.35% of nests, 67.93% of eggs, and 79.20% of chicks succeeded in riparian sites. In total, 57% of chicks (flown chicks/laid eggs) survived in apple orchards compared to 53.80% in riparian sites. Even the low difference recorded between the two sites is probably due to human disturbances and food availability. Indeed, the riparian sites are highly frequented by humans and motorized engines, in relation with the intensification of irrigated agriculture on the river banks. In apple orchards, the breeding period of the turtle dove (April to August) does not coincide with a high human presence (which is in August and September), making the breeding success of the species even greater than in orange groves [10, 19].

The major factor of breeding failure was predation in both types of sites, mainly by reptiles. However, in the relatively cold region of Midelt, low spring temperatures seem to be another significant factor, as it was responsible for 5.03% unhatched eggs and 5.45% dead chicks in orchards. On the contrary, the model with a binomial error structure indicated differences in the habitat features affecting breeding success, mainly in riparian habitats. Long distance separating breeding habitats on rivers with foraging (food and water) had a higher probability of nest failure (death of broods due to lack of sufficient food resources), while closer roads to breeding sites have intensified failures, mainly by the disturbance of breeder doves. On the contrary, breeding sites on orchards were inside cereals and surrounded by irrigation systems (availability of water), and these promote breeding success [20, 36, 44].

5. Conclusion

In summary, our study demonstrates that nesting features and breeding success of the migrant turtle dove differed between farmlands and natural woodlands. Nest placement is the same in the two habitat types, while nests were larger in apple orchards. Similarly, the breeding success rates were different as nesting, hatching, and fledging rates were higher in apple orchards. In addition, clutches failed due to predation and rough morning temperatures in orchards, while predation and desertion were the main factors of clutch failure in riparian habitats.

Additional studies of microfactors influencing breeding performances of turtle doves in both farmlands and woodlands are required to further explore the difference between natural and artificial habitats used by this globally vulnerable game. Similarly, the use of novel techniques, including telemetry and geolocation, will improve our understanding of the habitat use in both farmlands and wild habitats, particularly with the capacity of these tools to monitor all activity details inside and outside nesting sites. In this context, we planned a new monitoring that aims to clarify the relationship between chick death and temperature lowering in spring season, with expectation to more deeply investigate microclimate effects on the breeding performances of turtle dove.

Data Availability

The data used to support the findings of this study are included within the article.

Conflicts of Interest

The authors declare that they have no conflicts of interest.

Acknowledgments

The authors are grateful to Ait Ayach farmers for their help on the field work and data collection.

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Copyright © 2021 Ismail Mansouri et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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