Andrea H Claassen- PhD
- Biologist at Western Shasta Resource Conservation District
Andrea H Claassen
- PhD
- Biologist at Western Shasta Resource Conservation District
About
20
Publications
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Introduction
Current institution
Western Shasta Resource Conservation District
Current position
- Biologist
Publications
Publications (20)
Anthropogenic impacts are the greatest threat to survival of plant and animal populations worldwide. The importance of involving local communities in conservation is evident, yet poverty and livelihood concerns may preclude community participation in conservation, especially in developing countries. Payment for ecosystem services (PES) may enable l...
The Sekong, Sesan, and Srepok (3S) Rivers in Southeast Asia provide critical habitat for wildlife and support many threatened species. The Sesan and Sekong Rivers are regarded as Important Bird Areas, which recognizes their exceptional avian diversity and critical role in supporting waterbird populations. Additionally, these rivers provide diverse...
The River Tern Sterna aurantia is a fish-eating waterbird that breeds on riverine sandbars. Although once relatively widespread on large rivers throughout much of Southeast Asia, the River Tern has experienced significant population declines in recent decades. Cambodia contains > 90% of the River Tern population in Indochina. In Cambodia, the River...
Habitat selection occurs at multiple spatial scales and affects demographic processes including reproductive success. Few studies, however, have linked multi-scale habitat selection to reproductive success. We investigated breeding habitat selection at three spatial scales (nest site, nest area and territory), and the consequences of habitat select...
Bird records from Yeak Laom Lake, Ratanakiri, Cambodia, 2010-2018
Direct payments to communities or individuals have gained traction as a tool for species conservation; however, few studies have evaluated their effectiveness. From 2010 to 2014, we monitored nests and implemented a direct payment nest protection programme for six sandbar-nesting bird species on the Mekong River, Cambodia, and tested if nest protec...
Waterbird populations have declined around the world as a result of anthropogenic impacts from habitat loss and degradation, direct mortality, reproductive failure, and disturbance from humans and non-native and domestic animals. Specialist species are particularly at risk from changing environmental conditions and disturbances compared to generali...
Renesting is an important breeding strategy used by birds to compensate for nest failure. If birds renest, clutch removal for captive rearing can be used to augment endangered populations; however, not all individuals renest following nest loss, and later nesting attempts may have lower survival rates and clutch sizes. We investigated variation in...
The economic benefits of dams have been assumed to outweigh the costs, thus providing rationale for construction of dams around the world. However, the development of these structures can be accompanied by negative biophysical, socio-economic, and geopolitical impacts; often through the loss of ecosystem services provided by fully functioning aquat...
River ecosystems in Southeast Asia are some of the most biodiverse, yet most highly
threatened in the world. Northeastern Cambodia supports numerous bird species of
conservation significance, many of which depend on the river systems for all of their habitat
and food requirements. The contiguous stretches of the Mekong River and its three major
tri...
Questions
Questions (2)
I've been monitoring population trends of a threatened bird species in a developing country. My protocol uses numbers of breeding adults (not juveniles) to assess long-term population trends. My local colleagues are asking me why juveniles are not included in the population assessments. I know that only counting adult breeders is common protocol for many wildlife population studies, mainly because the adult population is more stable and less susceptible to short-term population fluctuations due to high juvenile mortality rates. However, I can't seem to find good references that specifically address this. Can anyone help me out with some references? Thanks in advance!
What concentration of DDT in fish tissues would it take to cause eggshell-thinning in piscivorous birds? I've found a lot of papers that give concentrations of DDT in eggs, and other studies that provide concentrations in body tissues of birds that were fed diets high in DDT, but I'm having trouble finding information regarding what concentration of DDT in fish might cause eggshell-thinning in birds. It seems that there is a lot of variation in how different bird species are affected by DDT. Specifically, I would like to know what level of DDT in fish would cause eggshell-thinning in terns, but this information for other seabird species or fish-eating raptors would also be helpful. Thanks.
