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Articles by Jason Chapman
Migration in butterflies: a global overview
Original Article Shawan Chowdhury Corresponding Author s.chowdhury@uqconnect.edu.au orcid.org/0000-0003-2936-5786 School of Biological Sciences, The University of Queensland, Saint Lucia, QLD, 4072 Australia Address for correspondence (Tel: +61 (0)469842439; E‐mail: s.chowdhury@uqconnect.edu.au). Search for more papers by this author PDF ShareShare ABSTRACT Insect populations including butterflies are declining worldwide, and they are becoming an urgent conservation priority in many regions.
Is the Timing, Pace, and Success of the Monarch Migration Associated With Sun Angle?
Introduction The eastern North American migratory population of monarch butterflies (Danaus plexippus) can migrate more than 4,000 km in late summer and early fall from breeding areas encompassing hundreds of millions of hectares across the eastern U.S. and Canada to reach Mexican overwintering sites comprising fewer than 20 hectares (Brower, 1997). The migration begins in early August at northerly latitudes and ends in Mexico as the last monarchs reach overwintering sites by early December.
Breeding ground correlates of the distribution and decline of the Common Cuckoo Cuculus canorus at two spatial scales
H1. At a national scale, Cuckoos’ habitat associations have changed over the period of population decline (1995–2010), with the probability of detecting Cuckoos becoming more positively associated with suitable semi‐natural habitats and the hosts which characterize those habitats (Reed Warbler and Meadow Pipit) and less positively (or negatively) associated with intensively managed agricultural habitats and the hosts which most characterize these habitats (Dunnock).
Breeding ground correlates of the distribution and decline of the Common Cuckoo Cuculus canorus at two spatial scales
Many migratory bird species are undergoing population declines as a result of potentially multiple, interacting mechanisms. Understanding the environmental associations of spatial variation in population change can help tease out the likely mechanisms involved. Common Cuckoo Cuculus canorus populations have declined by 69% in England but increased by 33% in Scotland. The declines have mainly occurred in lowland agricultural landscapes, but their mechanisms are unknown.
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