Trophic niches and feeding relationships of shorebirds in southern Brazil

Faria, Fernando Azevedo; Albertoni, Edélti Faria; Bugoni, Leandro

doi:10.1007/s10452-018-9663-6

Cited by 17 publications

(12 citation statements)

References 48 publications

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“…Flooded areas are associated with a higher abundance of yellow wagtails (Bradbury & Bradter, 2004). Puddles are also valuable to rare and non‐farmland bird species during migration (Faria et al ., 2018). Water resources are very important for birds, particularly certain species groups including waders, which show strong preferences for wetlands (Gunnarsson et al ., 2006; Eglington et al ., 2008 Fidorra et al ., 2016).…”

Section: Resultsmentioning

confidence: 99%

“…For farmland birds, puddles constitute a source of drinking water which is often limited in agricultural landscapes (Orłowski, 2005). Some insects reproduce rapidly in puddles (Paaijmans et al ., 2008) and, therefore, puddles may periodically provide important food resources (Faria, Albertoni & Bugoni, 2018). The yellow wagtail Motacilla flava L. and white wagtail often forage at puddles (see Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Second, the sustainability of ecosystem functioning is determined by species interactions forming so‐called social networks (Delmas et al ., 2019). SPELs may also increase the permeability and suitability of farmland for non‐farmland species, which may potentially modify species interactions and ecosystem processes within fields (Moreira et al ., 2005; Faria et al ., 2018). It is therefore important to study how SPELs affect social networks in farmland birds.…”

Section: Discussionmentioning

confidence: 99%

“…Below, we discuss the ecological mechanisms behind these effects and provide management recommendations based on our results.Our definition of a SPEL, and our list of 17 such elements, may be subjective, and others may exist in regions with different farming systems that may be potentially used by birds. Out of the publications collected herein, two‐thirds (65%) were from Europe, and 20% from North America, but some were from Australia (Fischer & Lindenmayer, 2002; Manning et al ., 2004; Barrett et al ., 2008; Haslem & Bennett, 2008; Robertson & Radford, 2009; Fischer et al ., 2010 a ; Le Roux et al ., 2018), South America (Di Giacomo & Lopez De Casenave, 2010; Carneiro et al ., 2012; Faria et al ., 2018; Godoi et al ., 2018), Africa (Martin et al ., 2009; Douglas et al ., 2014; Rodríguez‐Ruiz et al ., 2019) and Asia (Kamp et al ., 2009; Fijen et al ., 2015). We attempted, however, to list the most common SPELs occurring in the farmland of central Europe.…”

Section: Discussionmentioning

confidence: 99%

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Small things are important: the value of singular point elements for birds in agricultural landscapes

et al. 2021

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Farmland birds belong to the most endangered group of vertebrates in Europe. They are an important component of farmland biodiversity considering the numerous functions they perform (e.g. seed dispersal, improving germination, increasing gene flow, nutrient recycling, and pest control). Therefore, their decline imposes substantial risks on agricultural ecosystems. In general, farmland bird conservation includes land‐use and management alterations leading to less‐intensive farming and land‐sparing for breeding habitats (e.g. agri‐environment‐climate schemes, and organic farming). However, theoretical concepts describing farmland biodiversity maintenance and applied conservation measures usually ignore the role of singular, often very small, natural or man‐made elements in an agricultural landscape. These elements play a role in the populations of certain species, their biology and in the general species richness of farmland. Furthermore, the importance of these elements has never been empirically tested, which means that conservationists and practitioners are not aware of their measurable value for birds. Herein, we define and identify singular point elements in the agricultural landscape (SPELs) which are potentially important for breeding farmland birds. We also describe each SPEL and evaluate its importance for birds in farmland based on a systematic review of the available literature. Using a horizon‐scanning technique, we then polled field ornithologists about their personal observations of birds in relation to SPELs and the evaluation of the potential roles of such structures for birds. We identified 17 SPELs that vary in naturalness and age: singular trees, singular shrubs, erratic boulders, puddles, electricity pylons, wind turbines, spiritual sites, hunting platforms, fence and border posts, wells, road signs, scarecrows, piles of manure, piles of brushwood/branches, piles of stones/debris, piles of lime, and haystacks. Analysis of the literature revealed knowledge gaps, because some SPELs are frequently mentioned in ecological studies (e.g. trees, shrubs, pylons), but others such as spiritual sites, stones, hunting platforms, wells, road signs, or piles of lime are ignored. Despite the fact that some authors incorporate the effects of some SPELs in their studies, little research to date has aimed to assess the impact of various SPELs on farmland bird species numbers and distribution. Horizon scanning revealed that ornithologists often observe birds on various SPELs and thus, attribute to SPELs many functions that are important for maintaining bird populations. Horizon scanning also highlighted the importance of SPELs for many declining bird species and suggested possible mitigation of negative changes in the agricultural landscape by retaining SPELs within fields. We suggest that a better understanding of the role of SPELs for farmland birds is required. We also recommend that SPELs are considered as a potential tool for the conservation of birds, and existing conservation programs such as agri‐...

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Small things are important: the value of singular point elements for birds in agricultural landscapes

et al. 2021

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“…Furthermore, overlapping of niches tends to occur when there are similarities in the diet types that are shared by two or more groups of fish (Izzani 2012;de Oliveira and Isaac 2013). The overlapping values of each group tend to trigger interactions or compete for food in the same location (Faria et al 2018;Westerborn et al 2018;Beuttner and Koch 2019).…”

Section: Feeding Niches Areamentioning

confidence: 99%

Trophic level and position of Pterygoplichthys pardalis in Ciliwung River (Jakarta, Indonesia) ecosystem based on the gut content analysis

2020

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Abstract. Elfidasari D, Wijayanti F, Sholihah A. 2020. Trophic level and Position of Pterygoplichthys pardalis in Ciliwung River (Jakarta, Indonesia) ecosystem based on the gut content analysis. Biodiversitas 21: 2862-2870. The trophic level of an organism describes its sequence of natural diet visible to the food chain along with its ecosystem. This is also related to the type of diet composition and food fraction obtained by analyzing its gut content. The Pterygoplichthys pardalis from Ciliwung River show the diversity of the natural diet. The aims of this study is to determine the trophic level and position of P. pardalis in the Ciliwung River ecosystem based on gut content analysis using the purposive sampling method. Data were obtained from a total of 30 fishes from the Kalibata and Cawang areas through observations. The fishes were dissected, and gut contents were observed using a light microscope, with observations repeated 5 times of each sample. Data analysis includes relative length of gut, Index of Preponderance, area of the diet niche, niche area, niche overlap, and trophic level of an organism. The results showed that P. pardalis in Ciliwung River is at trophic level II, and included as herbivores (2.00 < troph < 2.90) that consist of Bacillariophyta (82.03%), Chlorophyta (12.7%), Cyanophyta (3.74%), Euglenophyta (1.19%), Amoebozoa (0.28%), and Dinoflagellata (0.68%).

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Dietary diversity of multiple shorebird species in an Asian subtropical wetland unveiled by DNA metabarcoding

et al. 2022

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Global declines in shorebird populations resulting from foraging habitat loss have been recently reported, and the situation within the East Asian-Australasian Flyway (EAAF) is particularly concerning. Despite previous studies that analyzed the foraging niches of shorebirds worldwide, the dietary niche dynamics of shorebirds coexisting in Asia are very poorly understood. This study is therefore among the early few that aim to unveil the trophic organization of shorebirds in a subtropical wetland within the EAAF which is vital for species conservation. Our study first determined the dietary spectra of more than 10 shorebird species, such as Calidris ferruginea (near threatened), Charadrius leschenaultii, and Pluvialis squatarola, by applying DNA metabarcoding with 18S and COI markers to fecal DNA. The diet of Tringa stagnatilis was also characterized, which was previously undescribed. Shorebirds that occurred in the wetland consumed a variety of food items, primarily a high abundance of malacostracans, mollusks, annelids, insects, and some arachnids. Different proportions of plant materials were also detected in many shorebird species. Using the data, we then revealed clear patterns of inter-and intraspecific variations between these shorebirds. Importantly, we specifically compared the similarities of the spring diets among seven sympatric shorebird species. We found that the dietary compositions of the seven species have segregated from each other to varying levels, but the many similar taxa we identified in the diets among these shorebirds imply that these populations of shorebirds could be competing at different levels. Thus, any reductions in the abundance and diversity of these important food resources would likely intensify their inter-and intraspecific competition, and simultaneously threaten the survival of multiple species. With these findings, conservation measures must be taken to protect and monitor the vital food resources for these energy-deprived shorebirds during migration.

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Trophic niches and feeding relationships of shorebirds in southern Brazil

Cited by 17 publications

References 48 publications

Small things are important: the value of singular point elements for birds in agricultural landscapes

Small things are important: the value of singular point elements for birds in agricultural landscapes

Trophic level and position of Pterygoplichthys pardalis in Ciliwung River (Jakarta, Indonesia) ecosystem based on the gut content analysis

Dietary diversity of multiple shorebird species in an Asian subtropical wetland unveiled by DNA metabarcoding

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