Registros nuevos de zambullidor menor (Tachybaptus dominicus) y de diez especies de anátidos en las adyacencias de la Bahía de La Paz, Baja California Sur, México

Abstract

BIRD CENSUSES WERE CONDUCTED ON THE BEACHES OF ENSENADA DE LA PAZ, FROM SEPTEMBER 1995 TO MAY 1998, AND IN RECENTLY DISCIVERED FRESH WATER PONDS FOR THE TREATMENT OF RESIDUAL WATERS FROM THE CITY OF LA PAZ. THE OBJECTIVE OF THIS PAPER IS TO PRESENT 18 RECORDS (INCLUDING BREEDING RECORDS) OF THE LEAST GREBE (TACHYBAPTUS DOMINICUS) DURING DECEMBER 1997 TO MAY 1998, AND SIX CONFIRMATIONS AND FOUR NEW RECORDS OF WATERFOWL IN THE AREA. THE PRESENCE OF ANSER ALBIFRONS, CHEN CAERULESCENS, ANAS DISCORS, ANAS STREPERA, ANAS PENELOPE AND ANAS AMERICANA WERE CONFIRMED; WHILE DENDROCYGNA AUTUMNALIS, CAIRINA MOSCHATA, MELANITTA PERSPICILLATA AND BUCEPHALA CLANGULA ARE NEW RECORDS FOR THE AREA. THE LEAST GREBE IS REPORTED FROM THE AREA, BUT NO RECORDS HAD BEEN OBTAINED AT LEAST IN THE PAST TWELVE YEARS. IN BASIS OF THE FEW RECENT RECORDS AVAILABLE AND THE THREATS TO ITS HABITATS, THIS SPECIES IS SUGGESTED FOR INCLUSION IN THE OFFICIAL LISTS (NORMA OFICIAL MEXICANA, NOM-059-ECOL-1994) AS THREATENED. MOST OF THESE RECORDS WERE MADE IN THE FRESHWATER HABITATS RECENTLY DISCOVERED; THUS THIS RECORDS ARE MORE RELATED TO THE FINDING OF THOSE HABITATS RATHER THAN TO CHANGES IN THE WATERFOWL COMPOSITION OF THE AREA.