JOHNSTON: CAYMAN ISLAND AVIFAUNA


TABLE 6.-BIRDS OF PURE LOGWOOD FORESTS.

 Grand Cayman
 Species December June
Zenaida asiatica FC
Colaptes auratus U U*
Centurus superciliaris U
Tyrannus caudifasciatus C
Myiarchus stolidus U*
Elaenia martinica U U
Mimus polyglottos FC FC*
Dumetella carolinensis C
Vireo crassirostris U FC*
Vireo magister C C*
Mniotilta varia U
Helmitheros vermivorus U
Parula americana FC
Dendroica petechia U U*
Dendroica tigrina U
Dendroica caerulescens U
Dendroica vitellina C VCO
Dendroica palmarum VC
Seiurus aurocapillus U
Seiurus noveboracensis U
Geothlypis trichas C
Setophaga ruticilla U
Coereba flaveola C VC*
Quiscalus niger U C*
Tiaris olivacca U0
Melopyrrha nigra U
 Total Species 24 10
 known or suspected breeders 10

 for nest sites and foods that birds are equally attracted. It is not sur-
 prising, therefore, to note the high number of bird species and their
 abundances found here (Table 10). Considering breeding birds alone,
 this formation supports the greatest species diversity and populations
 of all the terrestrial ecological formations on the Cayman Islands. Al-
 though this formation is relatively high in wintering migrants, these
 birds reach higher populations in other formations (for example, man-
 grove swamps and logwood forests). The avian population data from
 this disturbed formation, therefore, do not necessarily conform to the
 irregularity principle" mentioned above.

 POPULATION DENSITIES ON CAYMAN BRAC

 A large area physically suitable for precise quantitative evaluation of
 bird populations was difficult to find on these islands. Such an area,
 however, was located at one relatively undisturbed site on Cayman Brac.


1975