Volume 9 Issue 1
Nov.  2019
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Abstract
Background
Methods
Results
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Conclusions
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References
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Shan Tian, Jiliang Xu, Jianqiang Li, Zhengwang Zhang, Yong Wang. 2018: Research advances of Galliformes since 1990 and future prospects. Avian Research, 9(1): 32. DOI: 10.1186/s40657-018-0124-7
Citation: Shan Tian, Jiliang Xu, Jianqiang Li, Zhengwang Zhang, Yong Wang. 2018: Research advances of Galliformes since 1990 and future prospects. Avian Research, 9(1): 32. DOI: 10.1186/s40657-018-0124-7
shu

Research advances of Galliformes since 1990 and future prospects

  • 1.

    School of Nature Reserve, Beijing Forestry University, Beijing 100083, China

  • 2.

    Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, College of Life Sciences, Beijing Normal University, Beijing 100875, China

  • 3.

    Department of Biological and Environmental Science, College of Agricultural, Life and Natural Sciences, Alabama A&M University, Normal, AL 35762, USA

  • 4.

    College of International Education, Nanjing Forestry University, Nanjing 210037, China

Funds: 

the funded by the National Key Programme of Research and 422 Development, Ministry of Science and Technology 2016YFC0503200

More Information
  • Corresponding author:

    xujiliang@bjfu.edu.cn

  • Received Date: 04 Jul 2017
  • Accepted Date: 18 Sep 2018
  • Available Online: 24 Apr 2022
  • Publish Date: 26 Sep 2018
    Graphical Abstract
    • Abstract
  • Background 

    Galliformes are widely distributed throughout the world and economically important to humans as domesticated animals or gamebirds. They are at a unique position for advancing knowledge and techniques of wildlife conservation as the barometer of the status of applied ecology. Populations of many galliform species have declined mainly due to habitat loss and over-hunting. An assessment of knowledge of Galliformes could help to provide guidelines for future research and conservation strategies.

    Methods 

    Using the Web of Science search engine, we conducted a literature review of galliform-related articles published from 1990 to 2016. We used the "research area" option to filter articles focused on the zoology, environmental sciences ecology, biodiversity conservation, forestry, behavioral sciences, reproductive biology, biochemistry and molecular biology, cell biology, genetics and heredity, evolutionary biology, physiology and developmental biology. We then checked duplication based on the title, abstract and full text. In addition, we examined the reference lists of selected studies to include the publications that were missed by above searching.

    Results 

    We retained 1874 articles related to the Galliformes from the initial 243, 128 publications that were found. About 91.4% focused on one or two species, and 85.0% were conducted within a short duration, typically 1-2 years. The majority of the articles concentrated on macroscopic ecology (55.5%), mainly focusing on habitat selection or habitat use. With recent advances of molecular biology, the studies of taxonomy and phylogenetics rose quickly in last two decades. The study of physiology and biochemistry was no longer limited to simple description but expanded to the mechanisms of phenotype and micro-evolutionary potential. An additional area receiving increasing attention is the conservation of Galliformes, with the assessment of the conservation status and conservation management effectiveness of Galliformes (e.g. species diversity and genetic diversity) becoming the focus.

    Conclusions 

    The studies on Galliformes have made great achievements since 1990, but there are still gaps, particularly in macroscopic ecology, molecular genetics, and conservation. There is an urgent need to enhance long-term monitoring and analysis of population dynamics, and applying different disciplines to galliform conservation. Moreover, life history information of many galliform species is still lacking, which has hindered conservation efforts and effectiveness. In addition, multidiscipline studies and new technologies are not common for galliform studies, and should be encouraged.

    • FullText(HTML)

  • The evolution of life-history is mainly determined by the trade-off between key life-history traits to optimize the fitness, which should play critical roles in the survival and reproduction of birds (Lack 1948). Therefore, understanding variation between key traits among species has always been the main research subject of avian life-history evolution (Partridge and Harvey 1988; Martin 2004, 2015). Life history traits associated with reproduction, such as clutch size, egg colors and nest sites, can provide insights into resolving problems related to assessing population status and conservation (Martin 2002).

    Parrotbills are mainly distributed in China, where 19 species have been found (Alström et al. 2006, 2013; Robson 2014; Zheng 2017). Among them, the Three-toed Parrotbill (Cholornis paradoxus), Spectacled Parrotbill (Sinosuthora conspicillata), Rusty-throated Parrotbill (S. przewalskii) and Grey-hooded Parrotbill (S. zappeyi) are endemic to China (Lei and Lu 2006; Robson 2014; Zheng 2017). Until now, life history information about this group is limited. Detailed breeding information is available in only six species, including Vinous-throated Parrotbill (Sinosuthora webbianus; Kim et al. 1995; Guo et al. 2006; Lee et al. 2010; Lee and Jabloński 2012; Robson 2014), Reed Parrotbill (Paradoxornis heudei; Wang and Zhou 1988; Dong et al. 2010; Boulord et al. 2011), Grey-hooded Parrotbill (Jiang et al. 2009), Ashy-throated Parrotbill (S. alphonsianus; Yang et al. 2010), Golden Parrotbill (Suthora verreauxi; Yang et al. 2011) and Fulvous Parrotbill (S. fulvofrons; Hu et al. 2014). There are also a few descriptions about the nests or eggs in 10 species, such as Great Parrotbill (Conostoma oemodium), Brown-winged Parrotbill (Sinosuthora brunneus) and Black-breasted Parrotbill (Paradoxornis flairostris; Li et al. 2014; Robson 2014; Zhu 2014).

    The Spectacled Parrotbill is a relatively small and long-tailed parrotbill, which contains two subspecies, the nominated subspecies S. c. conspicillatus and S. c. rocki. It only occurs in quite limited areas in China, and the Lianhuashan National Nature Reserve is the center of this bird's distribution area (Zhao 2001). To our knowledge, there is still limited breeding information of the Spectacled Parrotbill (Zhao 2001; Robson 2014). In this study, we described the breeding biology of this bird in detail.

    Study area

    Our study was conducted in the experimental zone of the Lianhuashan National Nature Reserve in Gansu Province, China (34°57′–34°58′N, 103°46′–103°47′E, Fig. 1). The altitude ranges from 2200 to 2400 m a.s.l. The annual precipitation is about 650 mm, which is largely concentrated during the summer (from June to August). Snow cover lasts from November to early April in the following year. Mean annual temperature is about 5.1–6.0 ℃, with a maximum of 34 ℃ and a minimum of − 27.1 ℃ (Sun et al. 2008). The study area is 300 ha, fragmented by patch agricultural lands. The habitat is mainly covered by shrubs, which consists of many kinds of willows (Salix spp.), sea buckthorns (Hippophae rhamnoides), roses (Rosa spp.) and honeysuckles (Lonicera spp.), and some arbor trees distributed sporadically around the sites, including oaks (Ouercus liaotungensis), spruces (Picea asperata), firs (Abies fargesii) and birches (Betula utilis) (Sun et al. 2008).

    Figure  1.  The nest site distribution of Spectacled Parrotbill in 2013 (yellow filled circle), 2014 (blue filled circle) and 2015 (light blue filled circle) in Lianhuashan National Nature Reserve, Gansu Province, China. The numbers in upper and lower of right side were nest ID following Table 1
    DownLoad: Full-Size Img PowerPoint
    Table  1.  Nests of Spectacled Parrotbill in Lianhuashan Nature Reserve, Gansu Province, China
    Nest ID Date found Status when found Date of first egg Clutch size Nestlings Fledglings Nest fate
    1 25 May 2013 Incubation 18 May 2013b 5 5 5 Success
    2 18 April 2014 Egg laying 18 April 2014a 5 4 4 Success
    3 24 April 2014 Incubation 18 April 2014b 5 0 Eggs destroyed
    4 28 April 2014 Nest complete 1 May 2014a 5 3 0 Nestlings preyed
    5 27 May 2014 Nest complete 30 May 2014a 3 0 Eggs destroyed
    6 16 May 2014 Nestling period 30 April 2014b 4 4 0 Nestlings preyed
    7 5 June 2014 Nestling period 17 May 2014b 3 3 3 Success
    8 19 April 2015 Nest complete 11 April 2015a 4 0 Abandoned
    9 19 April 2015 Early construction 23 April 2015a 2 0 Abandonedc
    10 8 May 2015 Egg laying 5 May 2015b 5 5 5 Success
    11 4 May 2015 Incubation 13 April 2015b 4 0 Eggs destroyed
    12 14 May 2015 Nestling period 23 April 2015b 5 5 5 Success
    13 29 July 2015 Nestling fledging 28 June 2015b Success
    14 13 June 2015 Incubation 27 May 2015b 5
    15 13 April 2015 Nest empty
    16 27 April 2015 Nest empty
    a Estimated laying date of first egg
    b The observed laying date of first egg
    c Nest No. 9 was abandoned due to frequent visit, and was excluded in the calculation of clutch size
     | Show Table
    DownLoad: CSV

    Field investigation and data analysis

    We conducted our field study from May to August in 2013, and from April to August in 2014 and 2015. We searched the nests using combined methods (vocal and individuals' clues) of systematically searching all trails throughout the study area (Martin and Geupel 1993). When an active nest was located, we marked the position with blue rubber belt 10 m away from the nest, and then we checked all nests at every 3–5 days to record the laying date of first egg, clutch size, and hatching date. The first-egg date was estimated by the observed hatching date and egg mass (unpublished data), and hatching date was estimated by nestling mass (unpublished data). Shortly after completion of clutches, we measured egg weights to the nearest 0.01 g with a portable electronic scale, and egg size to 0.01 mm with vernier caliper. We calculated the minimum mean clutch size from observed number of nestlings and or eggs, assuming no more eggs were laid or nestlings hatched (Jiang et al. 2009). We measured nestling mass every other day in order to monitor nestling growth and measured other body measures (such as beak length, tarsus length, wing length) when nestlings were 10 days old. We observed the nest attendance behavior using cameras (AONI Q721 mini camera, Shenzhen, China) and 10 × 25 binoculars at a distance of 10–15 m to reduce human disturbance. We defined successful nests as those having at least one nestling fledged and unsuccessful nests as those abandoned or depredated (Yang et al. 2011).

    We also sampled plant coverage around nest sites, nest height above ground, and tree species and height as illustrated by Hu et al. (2017). The coverage and nest size were measured after nestlings fledged or nest fate was confirmed. Finally, the nests and their contents were collected. Sample sizes varied for different parameters because we could not inspect and measure all the nests regularly. We did not find enough nests each year to compare the number of nests among years, so we pooled all 3 years' data together. All the data were presented as mean ± standard deviation in the following.

    Nests and nest-building behavior

    We found a total of 16 nests during 3 years (1 nest in 2013, 6 in 2014, and 9 in 2015), and almost all nests (except 2 nests) were distributed within a 300-ha area (Fig. 1). All nests were located in the shrubs. Shrub coverage around the nests was 45% in average (n = 16). The main nest trees were artificial spruce saplings (6 nests) and honeysuckles (4 nests). The height of nest trees averaged 1.57 ± 0.53 m (range: 0.8–2.6 m, n = 16), and nest height was 0.89 ± 0.47 m (range: 0.4–2.3 m, n = 16) above the ground level. Nests were cup-shaped (Fig. 2b–d), and the outer and inner diameter of the nest were 8.00 ± 0.76 and 4.62 ± 0.49 cm (n = 6), respectively. The inside depth was 5.20 ± 0.13 cm and the outside height was 8.30 ± 0.41 cm (n = 6). Nest materials mainly consisted of leaves, fine strips of bark and some grasses. The interior of nest was normally covered with finer materials, occasionally with animal hair (Fig. 2b). Nests were constructed by both sexes over a period of several days (11 days in one nest). Parrotbills approached the nest sites cautiously and inspected the surroundings when they brought materials.

    Figure  2.  The adult bird (a), eggs and nest (b), incubation (c) and 7-day-old nestlings (d) of Spectacled Parrotbill (photographed by Lijun Chen)
    DownLoad: Full-Size Img PowerPoint

    Eggs and nestlings

    Of the 16 nests, 14 were active. Among them, one nest was found with eggs in 2013; two nests were found after the completion of nest construction, two nests were found with eggs and two nests with nestlings in 2014; two nests were found during the nesting period, three nests were found with eggs, two nests with nestlings, and two nests were empty in 2015 (Table 1). The first egg laying dates were mainly in April (n = 7) and May (n = 6), with only one in June. Eggs were laid 2–3 days after the completion of nest construction (n = 3). Egg laying happened normally in the morning before 10:30 (n = 10), and eggs were laid once per day (n = 5). The clutch size was 4.42 ± 0.79 eggs (range: 3–5 eggs, n = 12). We found a total of 55 eggs in 13 nests and measured 27 eggs in 6 nests. The eggs were oval shaped and in pale blue color without spots (Fig. 2b). The mean egg mass was 1.25 ± 0.07 g (range: 1.03–1.36 g, n = 27), the mean egg length was 15.56 ± 0.46 mm (range: 14.72–16.49 mm, n = 27), and the mean egg width was 12.46 ± 0.29 mm (range: 11.97–13.01 mm, n = 27).

    Incubation began when clutches were completed, and all lasted 13 days (n = 3). The nestling periods was 13–14 days (according to data of 2 nests). Based on measurements of four nestlings from one nest, the chick mass was 1.48 ± 0.35 g at the first day, 2.56 ± 0.09 g at the second day, 5.57 ± 0.91 g at the fifth day, 7.09 ± 0.68 g at the seventh day, and 7.90 ± 0.94 g at the tenth day. At ten-day age, the beak length, body length, wing length, tarsus length, tail length was 6.37 ± 0.24, 42.95 ± 4.42, 31.76 ± 3.20, 21.20 ± 0.32 and 10.91 ± 3.07 mm, respectively.

    Among the 14 active nests, the fate of one nest was unknown, six nests fledged successfully, two nests were deserted during egg laying period, three nests were destroyed by predators during incubation, and two nests were depredated during the nestling stages. As recorded by cameras (n = 5, including nests No. 2, 6, 7, 12 and 13 in Table 1), nestlings were depredated by a Red-winged Crested Cuckoo (Clamator coromandus) in one nest. The rate of nest success was 46% (6/13). Among those failed nests, nest predation rate was 71% (5/7), accounting for nearly three quarters of nest failure, and nest desertion (29%, 2/7) accounted for other one quarter of nest failure.

    This study descripted breeding information of Spectacled Parrotbill in detail. Spectacled Parrotbill nested in many kinds of habitat types, mainly in shrubs. Both parents constructed nest with materials of leaves, barks and animal hairs. Their eggs were pale blue eggs without speckles, both incubation and nestling periods were about 13 days long, and rate of nest success was almost 50%. The breeding pattern of Spectacled Parrotbill was similar to other parrotbills, but they also had their own roles.

    The Spectacled Parrotbill can construct their nests in various kinds of habitats, making them distribute relatively wider than bamboo-habitat specialized parrotbills. The breeding habitats of other known parrotbill species are normally limited to bamboo thickets or closely associated with reed habitats, such as Grey-hooded Parrotbill (Jiang et al. 2009), Fulvous Parrotbill (Hu et al. 2014) and Reed Parrotbill (Boulord et al. 2011; Xiong and Lu 2013). Normally, habitat specialists have limited distribution ranges with weak dispersal abilities and specific habitat requirement, sensitive to habitat disturbance or fragmentation (Warren et al. 2001; Julliard et al. 2006). Unlike the habitat specialists, the Spectacled Parrotbill is a kind of habitat generalist, which inhabits in dense grass, shrub or bamboo and reed habitat, making their population less sensitive to habitat disturbance. This is also found in Ashy-throated Parrotbill and Vinous-throated Parrotbill (Kim et al. 1995; Yang et al. 2010, 2011).

    Spectacled Parrotbill has a moderate nest predation rate (38.46%), but accounting for a large proportion of the nest failure (71.43%), which was much higher than that of Golden Parrotbill (44.44%) and Fulvous Parrotbill (18.18%) (Yang et al. 2011; Hu et al. 2014). This may relate to their different nest habitats, because Spectacled Parrotbill builds their nests in shrubs, which are more easily detected by predators, while the latter two build their nests within the bamboo thickets (Yang et al. 2011; Hu et al. 2014). Furthermore, the clutch size of Spectacled Parrotbill (4.42 ± 0.79, n = 12) was larger than Golden Parrotbill (3.50 ± 0.67, n = 12; Yang et al. 2011), Fulvous Parrotbills (3.38 ± 0.72, n = 16; Hu et al. 2014) and Grey-hooded Parrotbill (3.16 ± 0.8, n = 8; Jiang et al. 2009). The high nest predation in Spectacled Parrotbill may relate to their relatively large clutch size, because visiting rates of insectivorous birds were correlated to the number of eggs and nestlings, and high visiting rates may incur more predation risk (Skutch 1949; Martin 2015). We therefore suggest that the larger clutch size and nest habitat may play important roles in explaining nest predation of Spectacled Parrotbill. Unfortunately, we have little data for parental care of these species so further comparisons are impossible.

    In regard to the nest desertion rate, Spectacled Parrotbill (28.57%) is also higher than that of Golden Parrotbills (16.67%), but lower than that of Fulvous Parrotbill (66.67%) (Yang et al. 2011; Hu et al. 2014). The high rate of nest desertion in Fulvous Parrotbill was caused by tourist activities in Wawushan Nature Reserve (Hu et al. 2014). As to Spectacled Parrotbill, the nest desertion may be due to the human activities from consecutive disturbance of observers or passers-by and existence of cameras, or due to the existence of predator (personal observation), which needs further investigation.

    Spectacled Parrotbill has pale blue and immaculate eggs, which is in accordance with the closely related Grey-hooded Parrotbill (Jiang et al. 2009; Yeung et al. 2011), Golden Parrotbill (Yang et al. 2011), and Fulvous Parrotbill (Hu et al. 2014), but is different from some larger parrotbills, which have speckled eggs (Chen et al. 2016). The mechanisms of egg colors are complex. Although we did not observe egg polymorphism and brood parasitism in Spectacled Parrotbill, we cannot exclude that egg color may be driven by parasitism (Yang et al. 2010). Other mechanisms, like cryptic hypothesis (Underwood and Sealy 2002) and post-mating sexually-selected hypothesis (Moreno and Osorno 2003), are still remained to be explored.

    In present study, we reported the breeding information of Spectacled Parrotbill, including nest site, clutch size, nest construction, egg, nestling and nest fate, which should be helpful for further research about population and conservation of this bird.

    LC, LZ, YH and PL conducted field works, LC, NL and YS analyzed the data and drafted the manuscript. All authors read and approved the final manuscript.

    We thank the staff of the Lianhuashan Nature Reserve for their assistance in the field.

    The authors declare that they have no competing interests.

    The datasets used in the present study are available from the corresponding author on reasonable request.

    Not applicable.

    The experiments comply with the current laws of China in which they were performed.

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