Honduras Birds – Canopy Bird Species Research


Honduras Birds
Introduction Research Results Discussion Authors

Comparative Structure and Organization of Canopy Bird Assemblages in Honduras and Brazil

Results

Numbers of Detections and Species

From April 2006 to April 2007 DLA conducted 83 censuses in Honduras (56 canopy censuses and 27 ground transects), resulting in 2538 detections of 118 species in the canopy (Table 1). In Brazil, LNN conducted 117 censuses from November 1999 to November 2000, resulting in 9194 detections of 145 species observed in the canopy (Table 1). Our combined data set totals >11 000 detections of canopy birds.

 Honduras Emerald Hummingbird

The Honduran Emerald Hummingbird, (Amazilia luciae) is found solely in Honduras.
Photo copyright Fotokids/Guaruma

The rarefaction curve for all canopy species in Brazil is asymptotic, indicating that sampling was adequate for the questions posed by the study (Fig. 1a). The all-canopy species curve for Honduras has the same shape as the left side of the Brazil curve but is truncated before it reaches the graduated tail of the asymptote (Fig. 1a), indicating that sampling was also reasonably complete. More importantly, the curves for core canopy species in both Honduras and Brazil reached asymptotes, signaling that sampling of this group was complete and that few core species remained to be added.

Honduras Birds in the Pico Bonito Rainforest Video

TABLE 1. Number of bird species and detections (by sight or sound) from the canopy stratum at Pico Bonito National Park, Honduras, and Manaus, Brazil.
Honduras Squirrel Cuckoo

Squirrel Cuckoo – Piaya Cayana

No. of Species/No. of Detections

Method Censuses Census hours b All canopy species Core canopy species
HONDURAS
  Ground 27 66.7 (2.4 ± 0.56) 36/300 31/294
  Trees 56 168 (3 ± 0) 118/2238 66/2114
  Total 83 234.7 118/2538 66/2408
BRAZIL
  Towers (all surveys) 117 351 (3 ± 0) 145/9194 107/8814
  Towers (reduced set) a 56 168 (3 ± 0) 138/4575 107/4360

a Sample size reduced to equal number of censuses in Honduras.
b Numbers represent total census hours, with mean ± 1 SD in parentheses.

FIGURE 1.
Canopy Birds of Honduras - Chart
a) Sample-based rarefaction curves for canopy bird assemblages in Honduras and Brazil. Curves for all canopy species and core canopy species are shown separately. Dotted line around the curve for Brazil depicts 95% confidence interval for all canopy species.

 

 

 

 

 

Honduras Bird Species - Chart
b) Estimates of species richness for all species observed in the canopy (solid shapes) and core canopy species only (hollow shapes) for Honduras and Brazil derived from Chao 1 and Chao 2 estimators, respectively. Shapes represent means and bars encompass 95% confidence intervals. Observed species richness in the canopy in Costa Rica and Panama are also shown.

 

 

 

Species richness of canopy bird assemblages in Honduras and Brazil appeared similar. The rarefaction curve for Honduras birds fell within the 95% confidence interval of the curve for Brazil, indicating that richness of the two sites did not differ significantly (Fig. 1a).


Expected species richness for Honduras was approximately 130 species, or 20 species fewer than the 150 species expected for Brazil (Fig. 1b), although the difference was not statistically significant, on the basis of the level of sampling obtained. Observed species richness in Costa Rica and Panama was 86 and 84 species, respectively (Fig. 1b).

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