Growth model analysis of wild hyacinth macaw (Anodorhynchus hyacinthinus) nestlings based on long-term monitoring in the Brazilian Pantanal
Abstract Studies on the breeding of vulnerable and endangered bird species are hindered by low numbers of individuals, inaccessible location of nests, unfavourable environmental conditions, and complex behavioural patterns. In addition, intraspecific variation may emerge only following long-term, sy...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2022-09-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-022-19677-5 |
| _version_ | 1797995473966989312 |
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| author | Neiva Maria Robaldo Guedes Maria Cecília Barbosa Toledo Fernanda Mussi Fontoura Grace Ferreira da Silva Reginaldo José Donatelli |
| author_facet | Neiva Maria Robaldo Guedes Maria Cecília Barbosa Toledo Fernanda Mussi Fontoura Grace Ferreira da Silva Reginaldo José Donatelli |
| author_sort | Neiva Maria Robaldo Guedes |
| collection | DOAJ |
| description | Abstract Studies on the breeding of vulnerable and endangered bird species are hindered by low numbers of individuals, inaccessible location of nests, unfavourable environmental conditions, and complex behavioural patterns. In addition, intraspecific variation may emerge only following long-term, systematic observations of little-known patterns and processes. Here, data collected over 30 years were used to determine growth model of hyacinth macaw (Anodorhynchus hyacinthinus) chicks in the Pantanal biome of Brazil. During this period, the speed of growth and body mass of chicks varied widely. Four growth models were tested: logistic, Gompertz, Richards, and cubic polynomial. They were fitted using three biometric measurements: body mass, total length, and tail length. The best-fitting growth curves were identified using Akaike’s information criterion. The best models were the cubic polynomial for body mass, Richards for total length, and Gompertz for tail length. We confirmed the occurrence of dwarf individuals, whose body mass, total length, and tail length were 20%, 22%, and 70% smaller, respectively, than in the overall population. The dwarfs remain small in size after having fledged and are easily identified as adults. We discuss the importance of long-term studies to identify windows of opportunity for further research that will help in the conservation of endangered macaw species. |
| first_indexed | 2024-04-11T10:01:59Z |
| format | Article |
| id | doaj.art-a8db1af39ba54697a1580724399896e4 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-04-11T10:01:59Z |
| publishDate | 2022-09-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-a8db1af39ba54697a1580724399896e42022-12-22T04:30:24ZengNature PortfolioScientific Reports2045-23222022-09-0112111210.1038/s41598-022-19677-5Growth model analysis of wild hyacinth macaw (Anodorhynchus hyacinthinus) nestlings based on long-term monitoring in the Brazilian PantanalNeiva Maria Robaldo Guedes0Maria Cecília Barbosa Toledo1Fernanda Mussi Fontoura2Grace Ferreira da Silva3Reginaldo José Donatelli4Environment and Regional Development Graduate Program-Anhanguera, Uniderp UniversityEnvironmental Science Graduate Program, Universidade de Taubaté-UNITAUEnvironment and Regional Development Graduate Program-Anhanguera, Uniderp UniversityInstituto Arara Azul-ITAZoology Graduate Program, Universidade Estudual Paulista “Júlio de Mesquita Filho”-UNESPAbstract Studies on the breeding of vulnerable and endangered bird species are hindered by low numbers of individuals, inaccessible location of nests, unfavourable environmental conditions, and complex behavioural patterns. In addition, intraspecific variation may emerge only following long-term, systematic observations of little-known patterns and processes. Here, data collected over 30 years were used to determine growth model of hyacinth macaw (Anodorhynchus hyacinthinus) chicks in the Pantanal biome of Brazil. During this period, the speed of growth and body mass of chicks varied widely. Four growth models were tested: logistic, Gompertz, Richards, and cubic polynomial. They were fitted using three biometric measurements: body mass, total length, and tail length. The best-fitting growth curves were identified using Akaike’s information criterion. The best models were the cubic polynomial for body mass, Richards for total length, and Gompertz for tail length. We confirmed the occurrence of dwarf individuals, whose body mass, total length, and tail length were 20%, 22%, and 70% smaller, respectively, than in the overall population. The dwarfs remain small in size after having fledged and are easily identified as adults. We discuss the importance of long-term studies to identify windows of opportunity for further research that will help in the conservation of endangered macaw species.https://doi.org/10.1038/s41598-022-19677-5 |
| spellingShingle | Neiva Maria Robaldo Guedes Maria Cecília Barbosa Toledo Fernanda Mussi Fontoura Grace Ferreira da Silva Reginaldo José Donatelli Growth model analysis of wild hyacinth macaw (Anodorhynchus hyacinthinus) nestlings based on long-term monitoring in the Brazilian Pantanal Scientific Reports |
| title | Growth model analysis of wild hyacinth macaw (Anodorhynchus hyacinthinus) nestlings based on long-term monitoring in the Brazilian Pantanal |
| title_full | Growth model analysis of wild hyacinth macaw (Anodorhynchus hyacinthinus) nestlings based on long-term monitoring in the Brazilian Pantanal |
| title_fullStr | Growth model analysis of wild hyacinth macaw (Anodorhynchus hyacinthinus) nestlings based on long-term monitoring in the Brazilian Pantanal |
| title_full_unstemmed | Growth model analysis of wild hyacinth macaw (Anodorhynchus hyacinthinus) nestlings based on long-term monitoring in the Brazilian Pantanal |
| title_short | Growth model analysis of wild hyacinth macaw (Anodorhynchus hyacinthinus) nestlings based on long-term monitoring in the Brazilian Pantanal |
| title_sort | growth model analysis of wild hyacinth macaw anodorhynchus hyacinthinus nestlings based on long term monitoring in the brazilian pantanal |
| url | https://doi.org/10.1038/s41598-022-19677-5 |
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