Fasheng Zou

Genetic divergence and population demography of the Hainan endemic Black-throated Laughingthrush (Aves: Timaliidae, Garrulax chinensis monachus) and adjacent mainland subspecies.

Geographic variation in the Black-throated Laughingthrush (Garrulax chinensis) is examined to infer the influence of Pleistocene glacial oscillations on the genetic diversity of its subspecies. Mitochondrial evidence suggests that the endemic Hainan Island taxon, G. c. monachus, is monophyletic, whereas its closest continental relatives, G. c. chinensis and G. c. lochmius, are not. Multilocus coalescent analysis based on two mitochondrial and two nuclear intron loci indicates inter-subspecific genetic differentiation during the Pleistocene and substantial post-divergence genetic introgression from G. c. chinensis into G. c. lochmius. In contrast, G. c. monachus experienced no post-divergence gene flow despite occasional land-bridge contact with its continental relatives, suggesting its isolation may have been imposed by ecology as well as geography. It is probably reproductively isolated and should be treated as a distinct species.

Linking vegetation structure and bird organization: response of mixed-species bird flocks to forest succession in subtropical China

As forests undergo natural succession following artificial afforestation, their bird assemblages also change. However, interspecific avian social organization associated with forest succession has not been fully understood, particularly for mixed-species bird flocks. To disentangle how mixed-species flocks change as a function of local forest structure, we analyzed flock characteristics (particularly species richness, flocking frequency and propensity) and vegetation physiognomies along a presumed successional series (early, middle, and advanced) simultaneously in subtropical forests in southern China. As hypothesized, monthly point counts demonstrated that complexity of flocks increases with the progression of natural forest succession at a local scale. Advanced forests differed significantly from pioneering plantations with respect to vegetation structure, flock characteristics and constituents (especially for understory specialists). Importantly, forest succession affected flock patterns particularly in relation to the flocking propensity of regular species, and the frequency of nuclear species (Huet’s fulvetta Alcippe hueti), which in turn determined flocking occurrence at different successional stands. Canonical correspondence analysis indicated that understory flocking species (mainly Timaliidae babblers) were significantly associated with intact native canopy cover, complex DBH diversity, as well as high densities of dead trees and large trees, representing a maturity level of successional stands. Our study reveals that the effect of natural forest succession on mixed-species bird flocks is species-specific and guild-dependent. From a conservation perspective, despite a high proliferation of pine plantation in southern China, priority should be placed on protecting the advanced forest with a rich collection of understory flocking specialists.

Do bird assemblages predict susceptibility by e-waste pollution? A comparative study based on species- and guild-dependent responses in China agroecosystems.

Indirect effects of electronic waste (e-waste) have been proposed as a causal factor in the decline of bird populations, but analyses of the severity impacts on community assembly are currently lacking. To explore how population abundance/species diversity are influenced, and which functional traits are important in determining e-waste susceptibility, here we surveyed breeding and overwintering birds with a hierarchically nested sampling design, and used linear mixed models to analyze changes in bird assemblages along an exposure gradient in South China. Total bird abundance and species diversity decreased with e-waste severity (exposed < surrounding < reference), reflecting the decreasing discharge and consequent side effects. Twenty-five breeding species exclusively used natural farmland, and nine species decreased significantly in relative abundance at e-waste polluted sites. A high pairwise similarity between exposed and surrounding sites indicates a diffuse effect of pollutants on the species assembly at local scale. We show that sensitivity to e-waste severity varies substantially across functional guild, with the prevalence of woodland insectivorous and grassland specialists declining, while some open farmland generalists such as arboreal frugivores, and terrestrial granivores were also rare. By contrast, the response of waterbirds, omnivorous and non-breeding visitors seem to be tolerable to a wide range of pollution so far. These findings underscore that improper e-waste dismantling results in a severe decline of bird diversity, and the different bird assemblages on polluted and natural farmlands imply species- and guild-dependent susceptibility with functional traits. Moreover, a better understanding of the impact of e-waste with different pollution levels, combined multiple pollutants, and in a food-web context on bird is required in future.

Prevalence patterns of avian Plasmodium and Haemoproteus parasites and the influence of host relative abundance in southern China.

Infectious diseases threaten the health and survival of wildlife populations. Consequently, relationships between host diversity, host abundance, and parasite infection are important aspects of disease ecology and conservation research. Here, we report on the prevalence patterns of avian Plasmodium and Haemoproteus infections and host relative abundance influence based on sampling 728 wild-caught birds representing 124 species at seven geographically widespread sites in southern China. The overall prevalence of two haemoprotozoan parasites, Plasmodium and Haemoproteus, was 29.5%, with 22.0% attributable to Haemoproteus and 7.8% to Plasmodium. Haemoproteus prevalence differed significantly among different avian host families, with the highest prevalence in Nectariniidae, Pycnonotidae and Muscicapidae, whereas Plasmodium prevalence varied significantly among host species. Seventy-nine mitochondrial lineages including 25 from Plasmodium and 54 from Haemoproteus were identified, 80% of which were described here for the first time. The phylogenetic relationships among these parasites indicated stronger host-species specificity for Haemoproteus than Plasmodium. Well-supported host-family (Timaliidae) specific clades were found in both Plasmodium and Haemoproteus. The Haemoproteus tree shows regional subclades, whereas the Plasmodium clades are “scattered” among different geographical regions. Interestingly, there were statistically significant variations in the prevalence of Plasmodium and Haemoproteus among the geographical regions. Furthermore, the prevalence of Plasmodium and Haemoproteus were not significantly correlated with host relative abundance. Further efforts will focus on exploring the relationships between parasite prevalence and sex, age, and immune defense of the host.

Habitat Use of Waterbirds in Coastal Wetland on Leizhou Peninsula, China

Abstract From May 2000 to November 2003 we studied waterbird use of mangroves, intertidal flats, shrimp ponds and coastal forests surrounding Leizhou Peninsula at the southernmost extent of mainland China. We recorded 61 waterbird species. The most species-rich habitat was intertidal flat with 45 species, followed by mangrove with 38 species, shrimp ponds with 37 species and coastal forest with 15 species. Greatest bird abundance was on intertidal flats, which supported 69% of all birds recorded and 81% of all migrants. Leizhou Peninsula is in the East Asian-Australasian flyway of migratory birds and is an important staging site for migrants. Intertidal flats proved important to nationally and provincially protected and threatened species. Species richness and abundance at shrimp ponds nearly equaled that in mangroves. Charadriids, scolopacids and ardeids used shrimp pond dikes as roosts and foraging habitats during high tides. Shrimp pond dikes play an important role by substituting for natural high-tide roosts such as sandbars, which, in many cases, they replaced. Mangrove-planting programs should avoid conversion of important intertidal flats. When restoring abandoned shrimp ponds, it is also important to retain some dikes as high-tide roosts and foraging areas. Because of the complexity of coastal-zone land administration on Leizhou Peninsula, it is critical that government departments work together to plan and implement mangrove restoration and intertidal flat conservation projects.

Development and cross-amplification of 16 polymorphic microsatellite markers in the Chestnut Bulbul Hemixos castanonotus

A set of primers to amplify 16 microsatellite DNA loci was developed for the Chestnut Bulbul Hemixos castanonotus and the cross-amplification of these loci was tested in a closely related species, the ashy bulbul Hemixos flavala. A total of 30 Chestnut Bulbul individuals were genotyped. An average of 6.5 alleles per locus (2–12 alleles) was detected. The expected heterozygosity values ranged from 0.218 to 0.888. Four loci significantly deviated from Hardy–Weinberg equilibrium after Bonferroni correction. No significant linkage disequilibrium was detected. Fifteen of 16 loci were successfully amplified in the ashy bulbul, with rich polymorphism in 15 individuals tested. These markers will be useful in population genetics, conservation and phylogenies of the chestnut bulbul.

Effectiveness of protected areas for vertebrates based on taxonomic and phylogenetic diversity

Establishing protected areas is the primary goal and tool for preventing irreversible biodiversity loss. However, the effectiveness of protected areas that target specific species has been questioned for some time because targeting key species for conservation may impair the integral regional pool of species diversity and phylogenetic and functional diversity are seldom considered. We assessed the efficacy of protected areas in China for the conservation of phylogenetic diversity based on the ranges and phylogenies of 2279 terrestrial vertebrates. Phylogenetic and taxonomic diversity were strongly and positively correlated, and only 12.1-43.8% of priority conservation areas are currently protected. However, the patterns and coverage of phylogenetic diversity were affected when weighted by species richness. These results indicated that in China, protected areas targeting high species richness protected phylogenetic diversity well overall but failed to do so in some regions with more unique or threatened communities (e.g., coastal areas of eastern China, where severely threatened avian communities were less protected). Our results suggest that the current distribution of protected areas could be improved, although most protected areas protect both taxonomic and phylogenetic diversity.

Deep phylogeographic divergence of a migratory passerine in Sino- Himalayan and Siberian forests: the Red- flanked Bluetail ( Tarsiger cyanurus) complex

Enormous mountainous forests in Sino-Himalayans and Siberia harbor important avian biodiversity in the Northern Hemisphere. Numerous studies in last two decades have been contributed to systematics and taxonomy of passerines birds in these regions and have revealed various and complex phylogeographic patterns. A passerine species Red-flanked Bluetail Tarsiger cyanurus provided a good system to manifest such evolutionary complexity. The subspecies T. c. cyanurus and T. c. rufilatus (or/and T. c. pallidior), divergent in morphology, acoustics, and migratory strategies are allopatric in Siberia and Sino-Himalayan forests, respectively. The two taxa most likely deserve full species status but rigorous genetic analysis is missing. In this study, multilocus phylogeography based on mitochondrial DNA and Z-linked DNA reveals that T. c. cyanurus and T. c. rufilatus are reciprocally monophyletic with significant statistical support and differ with a large number of diagnostic nucleotide sites resulting substantial genetic divergence. Our finding supports the proposed split of Tarsiger cyanurus s.l. that T. cyanurus and T. rufilatus should be treated as two full species. Whether “pallidior” is a subspecies or geographical form of T. rufilatus is still uncertain. Additionally, these two forest passerine species may have diverged 1.88 (3.25–1.30) Mya, which might be shaped by geographical vicariance due to grassland and desert steppe on the central Loess Plateau during the Pliocene. Taken together, this study and further suggests another independent example of North Palearctic–Sino-Himalayan phylogeographic pattern in Palearctic birds.

A Questionnaire Survey of Ardeid Nesting Colony Distribution in Guangdong, Guangxi and Hainan, South China

Abstract A questionnaire on ardeid nesting colony distribution and nesting numbers in Guangdong, Guangxi and Hainan, South China was sent to academics, forestry officials and nature reserve staff in 2001. A total of 44 colonies was reported, of which a third was found in Pearl River Delta, the most important ardeid nesting area in south China according to this study. Although data were missing from over half of the known colonies, 2,300 nests of seven species were reported in Guangdong. In Guangxi, there were 2,365 nests of at least seven species, but little information was available for Hainan. Field counting of nests, and strengthening the protection of colonies against egg and chick collection, are recommended.

Habitat Features Rather Than Competition Explain the Distribution and Co-occurrence of Ardeidae in a Highly Urbanized Landscape

Abstract. Habitat selection by herons, egrets and bitterns (Ardeidae) is influenced by the extent and quality of surrounding wetlands in natural landscapes. However, these relationships may be different in highly modified urban environments where inter- and intra-specific competition could be increased. To assess the relative effects of habitat and competition on habitat selection by ardeids in an urban landscape, all known colonies in the densely populated coastal region around Macao Special Administrative Region, China, were surveyed. The relationship among ardeid communities and patch-level habitat variables were investigated using multivariate and co-occurrence analyses. Ardeid species (n = 12) were recorded during 2006–2009. Habitat patches were categorized into three types based on 10 habitat factors using redundancy analysis. The area of adjacent open land (r13= 0.772, P = 0.002) and patch area (r13= 0.670, P = 0.012) were the major indicators of species richness and abundance, respectively. However, the factor that influenced habitat selection the most was perimeter-area ratio (marginal effect: λ1 = 0.33). The lack of evidence for competition in the co-occurrence analysis suggested that the spatial pattern of the ardeid community in Macao Special Administrative Region, China, was primarily driven by variation in habitat features that satisfy species-specific requirements.