scholarly journals New data on the status and ecology of a galliform at risk of extinction: the Pyrenean grey partridge (Perdix perdix hispaniensis) in the Iberian System (Soria, Spain)

2021 ◽  
pp. 1-12
Author(s):  
J. C. Ceña ◽  
A. Ceña ◽  
V. Salvador–Vilariño ◽  
J. M. Meneses ◽  
C. Sánchez–García
Keyword(s):  
Habitat Loss ◽  
Species Conservation ◽  
Calluna Vulgaris ◽  
Perdix Perdix ◽  
Grey Partridge ◽  
Range Edge ◽  
Habitat Recovery ◽  
Pair Density ◽  
Risk Of Extinction ◽  
The Status

A study was conducted in 2008–2010 to gain knowledge on the status and ecology of the endangered subspecies of grey partridge (Perdix perdix hispaniensis), at its southernmost range edge. From an historic breeding range of 28,300 ha, 15 different coveys (adults with juveniles) were observed in an area comprising 5,550 ha, with an estimated minimum autumn population size of 103–113 birds and a maximum of 163–181 birds. Spring pair density was estimated at 2.3 pairs/1,000 ha, and when considering only coveys, 6.8 partridges/1,000 ha. The majority of birds were located at an altitude above 1,690 m a.s.l., mainly in mountain shrubland (especially Calluna vulgaris and Erica spp.). Habitat loss was the most important threat for the species’ conservation. In conclusion, efforts should prioritize urgent habitat recovery and monitoring in order to change the fate of the species.

scholarly journals New data on the status and ecology of a galliform at risk of extinction: the Pyrenean grey partridge (Perdix perdix hispaniensis) in the Iberian System (Soria, Spain)

2021 ◽  
pp. 1-12
Author(s):  
J. C. Ceña ◽  
A. Ceña ◽  
V. Salvador–Vilariño ◽  
J. M. Meneses ◽  
C. Sánchez–García
Keyword(s):  
Habitat Loss ◽  
Species Conservation ◽  
Calluna Vulgaris ◽  
Perdix Perdix ◽  
Grey Partridge ◽  
Range Edge ◽  
Habitat Recovery ◽  
Pair Density ◽  
Risk Of Extinction ◽  
The Status

A study was conducted in 2008–2010 to gain knowledge on the status and ecology of the endangered subspecies of grey partridge (Perdix perdix hispaniensis), at its southernmost range edge. From an historic breeding range of 28,300 ha, 15 different coveys (adults with juveniles) were observed in an area comprising 5,550 ha, with an estimated minimum autumn population size of 103–113 birds and a maximum of 163–181 birds. Spring pair density was estimated at 2.3 pairs/1,000 ha, and when considering only coveys, 6.8 partridges/1,000 ha. The majority of birds were located at an altitude above 1,690 m a.s.l., mainly in mountain shrubland (especially Calluna vulgaris and Erica spp.). Habitat loss was the most important threat for the species’ conservation. In conclusion, efforts should prioritize urgent habitat recovery and monitoring in order to change the fate of the species.

Testosterone Affects the Acoustic Structure of the Male Call in the Grey Partridge (Perdix Perdix)

Behaviour ◽  
1994 ◽  
Vol 128 (3-4) ◽  
pp. 301-310 ◽  
Author(s):  
L. Beani ◽  
L. Fusani ◽  
F. Dessi-Fulgheri
Keyword(s):  
Acoustic Structure ◽  
Perdix Perdix ◽  
Grey Partridge

Using evidence of decline and extinction risk to identify priority regions, habitats and threats for plant conservation in Australia

2018 ◽  
Vol 66 (7) ◽  
pp. 541 ◽  
Author(s):  
J. L. Silcock ◽  
R. J. Fensham
Keyword(s):  
At Risk ◽  
Threatened Species ◽  
Extinction Risk ◽  
Plant Conservation ◽  
State Legislation ◽  
Risk Of Extinction ◽  
The Status ◽  
Species Lists ◽  
Key Issues ◽  
Efficient Recovery

Threatened species lists are used at global, national and regional scales to identify species at risk of extinction. Many species are listed due to restricted population size or geographic distribution, and decline is often inferred rather than quantified. Vascular plants comprise over 70% of nationally listed threatened species, but there is an incomplete picture of which species are most at risk of extinction, where these occur and the factors behind their declines. We compiled published information and the best available field knowledge including 125 expert interviews to identify declining and at risk species. The candidate list comprised 1135 taxa, which were mostly listed as Critically Endangered or Endangered under Federal and/or State legislation, but included 80 that are currently unlisted but considered to be highly threatened. In total, 418 taxa were assessed as having a documented, suspected or projected continuing decline. These were ranked based on extinction risk and magnitude of continuing decline, which suggest that 296 are at risk of extinction under current management regimes, including 55 at high risk of extinction. Declining and imperilled taxa are concentrated in a relatively small number of regions and habitats, and six threatening processes are driving the majority of declines. Field surveys and robust, repeatable monitoring are required to better inform population trends and extinction risk, as well as inform the status of almost 200 taxa that are potentially imperilled but poorly known. Identification of declining taxa can identify key issues for flora conservation across a continent, and allow for targeted and efficient recovery efforts.

A taxonomic review of the Golden-green Woodpecker, Piculus chrysochloros (Aves: Picidae) reveals the existence of six valid taxa

Zootaxa ◽  
2013 ◽  
Vol 3626 (4) ◽  
pp. 531-542 ◽  
Author(s):  
GLAUCIA DEL-RIO ◽  
LUÍS FÁBIO SILVEIRA ◽  
VAGNER CAVARZERE ◽  
MARCO ANTONIO RÊGO
Keyword(s):  
South America ◽  
Atlantic Forest ◽  
Habitat Loss ◽  
Individual Variation ◽  
Valid Species ◽  
Morphometric Data ◽  
Phylogenetic Species ◽  
The Status ◽  
Lowland Forests ◽  
Southern Amazonia

Piculus chrysochloros (Vieillot 1818) is a species of woodpecker that ranges from Argentina to Panama, occurring in lowland forests as well as Cerrado, Caatinga and Chaco vegetation. Currently, nine subspecies are accepted, but no study has evaluated individual variation within populations, so the status of these taxa remains uncertain. Here we review the taxonomy and distribution of this species, based on morphological and morphometric data from 267 specimens deposited in ornithological collections. Our results suggest the existence of six unambiguous taxonomic units that can be treated as phylogenetic species: Piculus xanthochloros (Sclater & Salvin 1875), from northwestern South America; Piculus capistratus (Malherbe 1862), from northern Amazonia west to the Branco River; Piculus laemostictus Todd 1937, from southern Amazonia; Piculus chrysochloros (Vieillot 1818), from the Cerrado, Caatinga and Chaco; Piculus paraensis (Snethlage 1907) from the Belém Center of Endemism; and Piculus polyzonus (Valenciennes 1826) from the Atlantic Forest. Both Brazilian endemics (P. polyzonus and P. paraensis) are threatened due to habitat loss. In addition, we found one undescribed form from the Tapajós-Tocantins interfluve, now under study, that may prove to be a valid species once more specimens and other data become available.

scholarly journals Which is worse for the red-billed curassow: habitat loss or hunting pressure?

Oryx ◽  
2020 ◽  
pp. 1-9
Author(s):  
Elaine Rios ◽  
Philip J. K. McGowan ◽  
Nigel J. Collar ◽  
Maíra Benchimol ◽  
Gustavo R. Canale ◽  
...  
Keyword(s):  
Habitat Loss ◽  
Habitat Quality ◽  
Forest Cover ◽  
Explanatory Power ◽  
Forest Patches ◽  
Hunting Pressure ◽  
North East ◽  
Forest Remnants ◽  
The Status ◽  
Patch Density

Abstract Large ground-dwelling Neotropical gamebirds are highly threatened by habitat loss and hunting, but conservationists rarely attempt to distinguish between these two threats in the management of populations. We used three different types of species records to determine the status (i.e. persistence level) of the Endangered red-billed curassow Crax blumenbachii in 14 forest remnants in north-east Brazil, as either persistent, precarious or extirpated. We related these persistence levels to variables measured in a 2-km buffer radius, including variables associated with habitat quality (proportion of forest cover, length of rivers, patch density, distance from rivers) and hunting pressure (proportion of cacao agroforests and farmlands, length of roads, total area occupied by settlements, distance from roads and from settlements). Curassows were more persistent in forest patches located (1) more distant from settlements, (2) in landscapes with few settlements, (3) in landscapes with a high incidence of roads, (4) in a mosaic with a high proportion of forest, shaded cacao agroforest and farmland, and (5) more distant from other forest patches. Hunting pressure potentially exerts more influence on persistence than habitat quality: (1) hunting pressure submodels had a higher explanatory power than habitat quality submodels, (2) final models comprised four hunting pressure variables but only two habitat quality variables, and (3) hunting pressure variables appeared in all models whereas habitat quality variables appeared in only one final model. If hunting pressure is driving declines in curassows, regions with low human presence and a high proportion of forest cover are recommended for establishing new reserves.

scholarly journals First evidence of heteroplasmy in Grey Partridge (Perdix perdix)

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Claudia Pizzirani ◽  
Paolo Viola ◽  
Federica Gabbianelli ◽  
Anna Fagotti ◽  
Francesca Simoncelli ◽  
...  
Keyword(s):  
Perdix Perdix ◽  
Grey Partridge

The health signalling of ornamental traits in the Grey Partridge (Perdix perdix)

2013 ◽  
Vol 154 (3) ◽  
pp. 717-725 ◽  
Author(s):  
Jana Svobodová ◽  
Barbora Gabrielová ◽  
Petr Synek ◽  
Petr Marsik ◽  
Tomáš Vaněk ◽  
...  
Keyword(s):  
Perdix Perdix ◽  
Grey Partridge ◽  
Ornamental Traits

scholarly journals A population survey of the estuarine crocodile in the Ayeyarwady Delta, Myanmar

Oryx ◽  
2000 ◽  
Vol 34 (4) ◽  
pp. 317-324 ◽  
Author(s):  
John Thorbjarnarson ◽  
Steven G. Platt ◽  
U. Saw Tun Khaing
Keyword(s):  
Law Enforcement ◽  
Survey Data ◽  
Habitat Loss ◽  
Population Survey ◽  
Total Population ◽  
Population Declines ◽  
Wildlife Sanctuary ◽  
Coastal Regions ◽  
The Status ◽  
Crocodylus Porosus

AbstractThe estuarine crocodile Crocodylus porosus was formerly abundant in coastal regions of Myanmar, but is now known principally from the lower Ayeyarwady Delta. We conducted a survey during January 1999 to assess quantitatively the status of crocodile populations in protected areas of the lower delta. Spotlight counts were conducted along 275.4 km of waterways. Sixty-one crocodiles (50 juveniles, 4 subadults, 2 adults and 5 eyeshines) were observed in the Meinmahla Kyun Wildlife Sanctuary (MKWS), and the total population was estimated to be less than 100. The Kadônkani and Pyindaye Reserved Forests (RF) apparently no longer support viable populations. Although crocodiles remain critically endangered in the region, a comparison with survey data from 1980 suggests localized recovery is occurring in MKWS. Population declines are attributed to a combination of commercial skin hunting, habitat loss, drowning in fishing nets and over-collection of living animals to supply crocodile farms. A programme of law enforcement, habitat protection and head-starting juveniles is necessary to ensure the continued survival of estuarine crocodiles in the Ayeyarwady Delta.

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