TITLE

A statistical methodology for tracking long-term change in reporting rates of birds from volunteer-collected presence--absence data

AUTHOR(S)
Cunningham, Ross; Olsen, Penny
PUB. DATE
May 2009
SOURCE
Biodiversity & Conservation;May2009, Vol. 18 Issue 5, p1305
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The ability to track change in biodiversity is essential to guide sustainable management and meet biodiversity monitoring, evaluation and reporting requirements, yet long-term data are usually scarce. Birds Australia has developed a simple survey methodology for use by their nationwide network of volunteers; it involves the collection of data on the presence-absence of species at repeatedly visited sites. Here we present a statistical methodology for use with these binary data to examine long-term change, using as an example records from a major bioregion of eastern Australia, 1999-2007. Regression splines were employed to model trend as a smooth nonlinear function of time within a generalised linear modelling framework. Confidence intervals based on bootstrap resampling provided a basis for assessing the significance of change, and a method was incorporated for identifying important change points in the trajectory from second derivatives of the curve. The methodology proved sensitive to change and the impact of extended dry periods was evident. The populations of several woodland species were found to be in significant decline. Two composite indices to track change common to a group of birds were developed and/or adapted from the existing literature. The results confirm the usefulness of repeated 2-ha presence-absence survey data to provide insight into patterns of long-term trends in bird populations. The statistical methodology described offers a means of tracking trends and identifying important time points and is particularly useful in situations where surveys of presence-absence of species are the most efficient way to gather long-term data.
ACCESSION #
46784654

 

Related Articles

  • The influence of habitat and landscape on small mammals in Estonian coastal wetlands. Scott, Dawn M.; Joyce, Chris B.; Burnside, Niall G. // Estonian Journal of Ecology;2008, Vol. 57 Issue 4, p279 

    We investigated the influence of habitat type and landscape composition on small mammal relative abundance and diversity in coastal wetlands in western Estonia. Seventy live-trap lines in eight representative habitats, across six wetlands revealed seven species. The most diverse habitats were...

  • Representation of Global and National Conservation Priorities by Colombia's Protected Area Network. Forero-Medina, German; Joppa, Lucas // PLoS ONE;2010, Vol. 5 Issue 10, p1 

    Background: How do national-level actions overlap with global priorities for conservation? Answering this question is especially important in countries with high and unique biological diversity like Colombia. Global biodiversity schemes provide conservation guidance at a large scale, while...

  • Plant biodiversity in China: richly varied, endangered, and in need of conservation. López-Pujol, Jordi; Fu-Min Zhang; Song Ge // Biodiversity & Conservation;Nov2006, Vol. 15 Issue 12, p3983 

    China is among the world's richest countries in terms of plant biodiversity. Besides the abundant flora, containing some 33,000 vascular plants (30,000 angiosperms, 250 gymnosperms, and 2600 pteridophytes), there is extraordinary ecosystem diversity, as well as a large pool of both wild and...

  • Distributions of Natural Heritage Program Communities and their Use as Surrogates for Rare Species in New York State Parks. Robinson, George R. // Northeastern Naturalist;2012 Special Issue 6, Vol. 19, p115 

    Biodiversity distributions can be quantified as alpha (taxonomic richness), and beta (compositional heterogeneity) components. In both cases, accurate and detailed assessments require substantial resources, so surrogate measures have been proposed and tested. Scientists from the New York Natural...

  • Biogeography, current knowledge and conservation of threatened vascular plants characteristic of Mexican temperate forests. Luna Vega, Isolda; Alcántara Ayala, Othón; Contreras-Medina, Raúl; Ponce Vargas, Armando // Biodiversity & Conservation;Nov2006, Vol. 15 Issue 12, p3773 

    The main goal of this study is to document the biogeographical patterns, current status and conservation of 24 species of vascular plants in Mexico, all of them recorded in some risk category in the Mexican official publication named 'Norma Oficial Mexicana 059' (NOM-059) and some of them in the...

  • Are there habitats that contribute best to plant species diversity in coastal dunes? Acosta, A.; Carranza, M. L.; Izzi, C. F. // Biodiversity & Conservation;Apr2009, Vol. 18 Issue 4, p1087 

    The following paper describes patterns of diversity across major habitat types in a relatively well preserved coastal dune system in central Italy. The research addresses the following questions: (a) whether different habitats defined on the base of a land cover map support similar levels of...

  • The state of the southern Rockies ecoregion: a look at species imperilment, ecosystem protection, and a conservation opportunity Watson, John; Martin, William W.; Shinneman, Douglas J. // Endangered Species Update;Jan/Feb2000, Vol. 17 Issue 1, p2 

    The Cape Sable seaside sparrow (Ammodramus maritimus mirabilis) has been listed as federally endangered since 1967. Its small population size and unique ecology have perpetuated conservation concern. The ultimate factor in this sub-species' decline is the alteration of the everglades ecosystem....

  • Biodiversity Conservation through Invasive Exotic Plant Management. Sharma, Meena; Mahajan, Priya // Proceedings of World Academy of Science: Engineering & Technolog;Mar2009, Vol. 51, p652 

    Invasive exotic plants are non native organisms that occur outside their natural adapted ranges and dispersal potential. These plants species cause loss of biodiversity including species extinction and changes in hydrology and ecosystem function. Invasive species are serious hindrance to...

  • Monitoring large herbivore diversity at different scales: comparing direct and indirect methods. Cromsigt, Joris P. G. M.; Rensburg, Susan J. van; Etienne, Rampal S.; Olff, Han // Biodiversity & Conservation;May2009, Vol. 18 Issue 5, p1219 

    Monitoring of large herbivores is central to research and management activities in many protected areas. Monitoring programs were originally developed to estimate (trends in) population sizes of individual species. However, emphasis is shifting increasingly towards conservation of diversity and...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics