Mr Cesar Javier Lenzi Gomez, Centro de Investigación y Conservación Marina - CICMAR, Uruguay
2013 Conference Paper:
"Geographical Distribution and Colony Sizes of New World Larus Gulls and Their Association to High Productive Areas at Sea"
Presenter(s): Cesar Javier Lenzi Gomez, Centro de Investigación y Conservación Marina—CICMAR, Uruguay
Preliminary results are presented about patterns of distribution and colony size of Larus colonies in the New World and their relation with the primary production at sea. Fifty papers were reviewed containing information about colony sizes and geographical location. Analysis of chlorophyll concentration (mg/m3) at sea was performed using an ocean color satellite image (SeaWiFS) data from September 1997 to April 2002. The distribution of the gull colonies and the distribution of the high productive areas at sea were analyzed using a resampling method using MATLAB 7.0.4. Results suggested that geographical positions of the colonies and geographical positions of the nearest-maximum chlorophyll areas were not randomly distributed (overall mean observed=191 Km. S.D. = 154, lesser than the percentile 2.5 of the resample distribution= 3528 Km). Neither seasonally random distributions between the colonies and high productive areas were observed. A negative association between the
