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The site was identified as internationally important for bird conservation in 2007 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species') at the site:

Species	Red List	Season (year/s of estimate)	Size	IBA criteria
Puerto Rican Nightjar Antrostomus noctitherus	VU	resident (1985–1999)	347 birds	A1, A2
Green Mango Anthracothorax viridis	LC	resident (2007)	unknown	A2
Puerto Rican Mango Anthracothorax aurulentus	LC	resident (2005)	unknown	A2
Green-throated Carib Eulampis holosericeus	LC	resident (2007)	unknown	A2
Puerto Rican Emerald Riccordia maugaeus	LC	resident (2005)	unknown	A2
Antillean Crested Hummingbird Orthorhyncus cristatus	LC	resident (2007)	unknown	A2
Puerto Rican Lizard-cuckoo Coccyzus vieilloti	LC	resident (2005)	unknown	A2
Roseate Tern Sterna dougallii	LC	breeding (2000)	2–350 birds	A4i
Puerto Rican Owl Gymnasio nudipes	LC	resident (2005)	unknown	A2
Puerto Rican Tody Todus mexicanus	LC	resident (1973–1988)	unknown	A2
Puerto Rican Woodpecker Melanerpes portoricensis	LC	resident (2005)	unknown	A2
Caribbean Elaenia Elaenia martinica	LC	resident (2007)	unknown	A2
Lesser Antillean Pewee Contopus latirostris	LC	resident (2005)	unknown	A2
Puerto Rican Flycatcher Myiarchus antillarum	LC	resident (1973–1988)	17 birds	A2
Puerto Rican Vireo Vireo latimeri	LC	resident (1990–1993)	88 birds	A2
Pearly-eyed Thrasher Margarops fuscatus	LC	resident (1973–1988)	unknown	A2
Puerto Rican Euphonia Euphonia sclateri	LC	resident (2005)	unknown	A2
Adelaide's Warbler Setophaga adelaidae	LC	resident (1973–1988)	4 birds	A2
Puerto Rican Spindalis Spindalis portoricensis	LC	resident (2005)	unknown	A2
Puerto Rican Bullfinch Melopyrrha portoricensis	VU	resident (1973–1988)	26 birds	A2

Year	Protected Area	Designation (management category)	% coverage of IBA
-	Reserva Natural Bahía Ballena	Private Conservation (V)	1
-	Reserva Natural Bahia Ballena	Natural Reserve (-)	-
1981	Guanica	UNESCO-MAB Biosphere Reserve (UA)	49
1985	Bosque Estatal de Guánica	Natural Reserve (V)	55
1985	Guaníca	Commonwealth Forest (-)	66

Habitat	% of IBA	Habitat detail
Forest	major (>10)	Mangrove; Tropical semi-deciduous
Marine Neritic	major (>10)
Shrubland	major (>10)	Arid lowland scrub
Introduced vegetation	minor (<10)
Marine Coastal/Supratidal	minor (<10)

Land use	% of IBA
nature conservation and research	-
tourism/recreation	-
rangeland/pastureland	-

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Karso del Sur (Puerto Rico (to USA)). Downloaded from https://datazone.birdlife.org/site/factsheet/karso-del-sur-iba-puerto-rico-(to-usa) on 23/12/2024.