Occupancy and density of a habitat specialist and a sympatric generalist songbird species in Tasmania

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Título: Occupancy and density of a habitat specialist and a sympatric generalist songbird species in Tasmania
Autor/es: Alves, Fernanda | López Iborra, Germán M. | Stojanovic, Dejan | Webb, Matthew H. | Langmore, Naomi | Heinsohn, Robert
Grupo/s de investigación o GITE: Ecología Espacial y del Paisaje (EEP) | Zoología de Vertebrados
Centro, Departamento o Servicio: Universidad de Alicante. Departamento de Ecología | Universidad de Alicante. Instituto Multidisciplinar para el Estudio del Medio "Ramón Margalef"
Palabras clave: Density | Endangered species | Forty-spotted pardalote | Generalist species | Occupancy | Specialist species | Striated pardalote
Área/s de conocimiento: Ecología
Fecha de publicación: dic-2019
Editor: Wiley
Cita bibliográfica: Austral Ecology. 2019, 44(8): 1430-1437. doi:10.1111/aec.12817
Resumen: Patterns of distribution and abundance of species are dependent on their particular ecological requirements. Taking specialisation into account is important for interpreting population parameters. Here, we evaluate population parameters of an endangered habitat specialist, the forty‐spotted pardalote (Pardalotus quadragintus; dependent on white gum Eucalyptus viminalis in south‐eastern Tasmania), and a sympatric congeneric habitat generalist, the striated pardalote (Pardalotus striatus). We used occupancy models to estimate occupancy of both species, and distance sampling models to estimate population density and size on North Bruny Island. Within their shared habitat (i.e. white gum forest), we also fitted hierarchical distance sampling models to estimate density in relation to fine‐scale habitat features. We show that forty‐spotted pardalotes only occurred in forests where white gums were present, with a mean density of 2.7 birds per hectare. The density of forty‐spotted pardalotes decreased in areas with abundant small trees and trees with dead crowns, but they increased in areas where larger white gums were abundant. The striated pardalote was widespread, but where white gums were present, they occurred at 2.1 birds per hectare, compared to 0.6 birds per hectare in forests where white gums were absent. Within white gum habitat, the relative abundance of forty‐spotted pardalotes and dead trees had a positive effect on the density of striated pardalotes while small trees had a negative effect. Our study reveals that although widespread, the generalist is most abundant in the limited areas of habitat suitable for the specialist, and this indicates the need of future research to look at whether this pattern of occurrence exacerbates competition in resource depleted habitats.
URI: http://hdl.handle.net/10045/99168
ISSN: 1442-9985 (Print) | 1442-9993 (Online)
DOI: 10.1111/aec.12817
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: © 2019 Ecological Society of Australia
Revisión científica: si
Versión del editor: https://doi.org/10.1111/aec.12817
Aparece en las colecciones:INV - EEP - Artículos de Revistas
INV - ZV - Artículos Científicos
INV - ECPCA - Artículos de Revistas

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