rian.ie - Browse

Author(s)
Institution
Publication types
Funder
Year

Limited By:	Author = Critchley, Emma Jane;

3 items found

Sort by

Order

per page

Displaying Results 1 - 3 of 3 on page 1 of 1

Marked Mark

Acoustic activity across a seabird colony reflects patterns of within-colony flight rather than nest density (2019)

Arneill, Gavin E.; Critchley, Emma Jane; Wischnewski, Saskia; Jessopp, Mark J.; Quinn, ...

Acoustic activity across a seabird colony reflects patterns of within-colony flight rather than nest density (2019)

Arneill, Gavin E.; Critchley, Emma Jane; Wischnewski, Saskia; Jessopp, Mark J.; Quinn, John L.

Abstract:

Passive acoustic monitoring is increasingly being used as a cost‐effective way to study wildlife populations, especially those that are difficult to census using conventional methods. Burrow‐nesting seabirds are among the most threatened birds globally, but they are also one of the most challenging taxa to census, making them prime candidates for research into such automated monitoring platforms. Passive acoustic monitoring has the potential to determine presence/absence or quantify burrow‐nesting populations, but its effectiveness remains unclear. We compared passive acoustic monitoring, tape‐playbacks and GPS tracking data to investigate the ability of passive acoustic monitoring to capture unbiased estimates of within‐colony variation in nest density for the Manx Shearwater Puffinus puffinus. Variation in acoustic activity across 12 study plots on an island colony was examined in relation to burrow density and environmental factors across 2 years. As predicted fewer calls were re...

http://hdl.handle.net/10468/8320

Marked Mark

Assessing the distribution and vulnerability of a seabird community at sea to inform conservation and management (2018)

Critchley, Emma Jane

Assessing the distribution and vulnerability of a seabird community at sea to inform conservation and management (2018)

Critchley, Emma Jane

Abstract:

Seabirds are an apex predator in marine ecosystems and can be important bio-indicators for informing wider marine conservation and management. They face many threats from anthropogenic activities at sea but the interactions and subsequent impacts can often be difficult to monitor, particularly in pelagic regions. Ireland and Britain in the north-eastern Atlantic Ocean host internationally important numbers of many seabird species. However, there are challenges in assessing their distribution at sea, not least the time and costs involved in trying to do this at the community level. The large territorial waters of both countries also provide significant prospective marine fossil fuels and renewable energy. Therefore, there is the potential for detrimental impacts to seabird populations where hotspots of seabird density overlap with marine energy activity. In this thesis I demonstrate how existing data can be combined to assess the at-sea distribution, vulnerability, and gaps in conser...

http://hdl.handle.net/10468/7822

Marked Mark

Assessing the effectiveness of foraging radius models for seabird distributions using biotelemetry and survey data (2019)

Critchley, Emma Jane; Grecian, W. J.; Bennison, Ashley; Kane, Adam; Wischnewski, Saskia...

Assessing the effectiveness of foraging radius models for seabird distributions using biotelemetry and survey data (2019)

Critchley, Emma Jane; Grecian, W. J.; Bennison, Ashley; Kane, Adam; Wischnewski, Saskia; Cañadas, A.; Tierney, D.; Quinn, John L.; Jessopp, Mark J.

Abstract:

Relatively simple foraging radius models have the potential to generate predictive distributions for a large number of species rapidly, thus providing a cost‐effective alternative to large‐scale surveys or complex modelling approaches. Their effectiveness, however, remains largely untested. Here we compare foraging radius distribution models for all breeding seabirds in Ireland, to distributions of empirical data collected from tracking studies and aerial surveys. At the local/colony level, we compared foraging radius distributions to GPS tracking data from seabirds with short (Atlantic puffin Fratercula arctica, and razorbill Alca torda) and long (Manx shearwater Puffinus puffinus, and European storm‐petrel Hydrobates pelagicus) foraging ranges. At the regional/national level, we compared foraging radius distributions to extensive aerial surveys conducted over a two‐year period. Foraging radius distributions were significantly positively correlated with tracking data for all specie...

http://hdl.handle.net/10468/9346

Displaying Results 1 - 3 of 3 on page 1 of 1