05/10/2020
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Poachers select parrot species based on their attractiveness

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Confirmation has come of a practice widely suspected to be true, but in practice one that remained unexamined objectively – poachers do not randomly trap every kind of parrot they encounter, but instead increasingly select the species that are considered to be progressively more attractive.

This is the main message from a recently published study conducted in 2019 in Colombia by Spanish scientists from the Doñana Biological Station, University of Pablo de Olavide, University of Oviedo and National Museum of Natural Sciences, and supported by the Loro Parque Fundación. Colombia is one of the most biodiverse countries in the world, where trapping and keeping native animals as pets is entrenched, but punishable by law since 1977.

Scientists conducted a large-scale survey which simultaneously estimated the relative abundances (individuals per kilometre for each species) of wild parrots, by means of roadside surveys, and of illegally trapped pets by visiting villages. Their study route traversed no fewer than 2,221 km of low-transit and unpaved roads through the Caribbean, Pacific and Andean regions of the country, surveying the main biomes across a wide altitudinal range up to 3,520 m. The route passed through patches of habitat categorized as pristine natural, degraded natural, mixed natural/agricultural, agricultural and urban. Similar to other roadside parrot surveys, the driver and two experienced observers drove a 4x4 vehicle at low speed (10-40 km/h) from dawn to dusk, avoiding rain and hot middays when parrot activity declines, and briefly stopping when needed to identify species and to count the number of individuals in flocks.


The spectacular Scarlet Macaw has declined significantly in Colombia since 1950, with poaching a significant factor in its demise (Travis Isaacs).

The number of native parrots in each village visited was recorded as a direct measure of domestic poaching pressure, the pet owners confirming that all native individuals were poached. There was no evidence of attempts to breed them in captivity. Most people did not hide their pets, nor were they afraid to keep them illegally, and were willing to give additional information, such as the price they paid for a parrot.

The scientists rated the attractiveness of each parrot species based on its body size, colouration, and ability to imitate human speech, using a uniform scoring method. Parrot colouration was scored as the proportion of the body and head covered by bright colours, and the total number of colours observed when the parrot is perched. The ability of each individual pet to imitate human speech was ranked into five categories, from individuals unable to imitate to individuals able to imitate human speech very well, sing songs, and imitate other domestic animals or other sounds. Scores were averaged for each species.

To check the validity of local opinion about mimicry, the same question was asked of five people from USA, France, Germany and Spain with more than 20 years of experience breeding and keeping a large variety of parrot species in captivity. The average scores provided by these experts correlated well with those provided by local pet owners. Finally, the researchers used a statistical method to obtain a composite variable that describes the attractiveness of each parrot species as a function of its colour, body size, and ability to speak. The researchers also used a selectivity index to assess whether parrot species are poached proportionally to their abundances in the wild.


Confiscated macaws in Colombia. Despite being punishable by law since 1977, keeping wild parrots as pets remained entrenched in the country's culture (supplied: Loro Parque Fundación).

From the 2,221 km of roadside surveys, the scientists recorded 10,811 wild individuals of 25 parrot species, covering a wide variety of biomes with different degrees of human alteration. Overall abundance reached 4.87 individuals/km, but 80.3% of records were of only two species, Orange-chinned Parakeet and Brown-throated Parakeet. The other species were present in low numbers, were extremely rare or even unrecorded in the wild. Simultaneously, they recorded 1,179 pets from 21 native parrot species in the 282 villages surveyed. Of the 358 local people who ventured information, 58% of them kept poached native parrot pets at the time of the survey or at least recently, and 38% knew other people also keeping them.

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In absolute numbers, Orange-chinned and Brown-throated Parakeets comprised 45.2% of all pet parrots, but in fact these species were negatively selected when considering their high abundances in the wild. By contrast, most amazons (Amazona spp), large macaws (Ara spp) and Blue-crowned Parakeets, mostly uncommon or extremely rare in the wild, were strongly positively selected as pets. For the other species there was no significant selection, being kept as pets in proportion to their availability in the wild. The attractiveness value was positively related to the selectivity index, showing that the most attractive species were poached in larger numbers than expected based on their availability in the wild.

The price of the species increased with their attractiveness but was unrelated to their abundances in the wild, indicating that the most attractive but not the rarest species were more valuable. Example average local prices (all in US$) were just 5.68 for a Brown-throated Parakeet, but 145.22 for a Scarlet Macaw, with in-between cases being 16.46 for a Blue-headed Parrot, 34.41 for a Yellow-crowned Amazon and 43.57 for Blue-and-yellow Macaw.


Orange-chinned (pictured) and Brown-throated Parakeets made up 80% of the parrots recorded from roadside surveys, yet formed only 45% of the illegally captured pet parrots observed in villages (Felix Uribe).

As the scientists conclude from the results of their study in Colombia, parrot poaching is not an opportunistic but a selective wildlife crime, with potentially serious ecological and conservation consequences. In ecological terms, the selective poaching of the largest parrot species (macaws and amazons) may have a disproportionately strong negative impact, because these species are the main, and sometimes the only, effective long-distance seed dispersers of palms and trees with large-sized fruits, which are key species in several ecosystems.

In conservation terms, the trade of some attractive parrot species has been shown to cause negative population trends. In Colombia there is evidence that poaching has caused large population declines and distribution contractions of Yellow-crowned Amazon, considered as the species that best imitates human speech, and of the highly demanded Scarlet Macaw was considered the most abundant macaw species in the country in the 1950s, in contrast with its rarity in 2019.

The results of this study will help guide targeted actions for the conservation of those parrot species highlighted as at most risk.

 

Reference

Romero-Vidal, P, Hiraldo, F, Rosseto, F, Blanco, G, Carrete, M, & Tella, J L. 2020. Opportunistic or non-random wildlife crime? Attractiveness rather than abundance in the wild leads to selective parrot poaching. Diversity, 12: 314. https://doi.org/10.3390/d12080314

Written by: David Waugh, Loro Parque Fundación

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