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Diversity metrics, species turnovers and nestedness of bird assemblages in a deep karst sinkhole

Diversity metrics, species turnovers and nestedness of bird assemblages in a deep karst sinkhole We reported a study on breeding birds occurring inside an 80 m-deep karst sinkhole, with the characterization of the assemblages recorded along its semi-vertical slopes from the upper edge until the bottom. The internal sides of the sinkhole have been vertically subdivided in four belts about 20 m high. The highest belt (at the upper edge of the cenote) showed the highest values in mean number of bird detections, mean and normalized species richness, and Shannon diversity index. The averaged values of number of detections and species richness significantly differ among belts. Species turnover (Cody’s β-diversity) was maximum between the highest belts. Whittaker plots showed a marked difference among assemblages shaping from broken-stick model to geometric series, and explicited a spatial progressive stress with a disruption in evenness towards the deepest belts. Bird assemblages evidenced a nested subset structure with deeper belts containing successive subsets of the species occurring in the upper belts. We hypothesize that, at least during the daytime in breeding season, the observed non-random distribution of species along the vertical stratification is likely due to (i) the progressive simplification both of the floristic composition and vegetation structure, and (ii) the paucity of sunlight as resources from the upper edge to the inner side of the cenote. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Israel Journal of Ecology and Evolution Brill

Diversity metrics, species turnovers and nestedness of bird assemblages in a deep karst sinkhole

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Publisher
Brill
Copyright
Copyright © Koninklijke Brill NV, Leiden, The Netherlands
ISSN
1565-9801
eISSN
2224-4662
DOI
10.1163/22244662-06301009
Publisher site
See Article on Publisher Site

Abstract

We reported a study on breeding birds occurring inside an 80 m-deep karst sinkhole, with the characterization of the assemblages recorded along its semi-vertical slopes from the upper edge until the bottom. The internal sides of the sinkhole have been vertically subdivided in four belts about 20 m high. The highest belt (at the upper edge of the cenote) showed the highest values in mean number of bird detections, mean and normalized species richness, and Shannon diversity index. The averaged values of number of detections and species richness significantly differ among belts. Species turnover (Cody’s β-diversity) was maximum between the highest belts. Whittaker plots showed a marked difference among assemblages shaping from broken-stick model to geometric series, and explicited a spatial progressive stress with a disruption in evenness towards the deepest belts. Bird assemblages evidenced a nested subset structure with deeper belts containing successive subsets of the species occurring in the upper belts. We hypothesize that, at least during the daytime in breeding season, the observed non-random distribution of species along the vertical stratification is likely due to (i) the progressive simplification both of the floristic composition and vegetation structure, and (ii) the paucity of sunlight as resources from the upper edge to the inner side of the cenote.

Journal

Israel Journal of Ecology and Evolution – Brill

Published: Feb 7, 2017

References

  • Bird community dynamics and habitat associations in Karst
  • A consistent metric for nestedness analysis in ecological systems: reconciling concept and measurement
  • Implementing a comprehensive approach for evaluating significance and disturbance in protected karst areas to guide management strategies
  • Speciation in Cave Faunas
  • Ecological conditions, flora and vegetation of a large doline in the Mecsek Mountains (South Hungary)
  • A comparison of the vegetation of forested and non-forested solution dolines in Hungary: a preliminary study
  • The data reliability in ecological research: a proposal for a quick self-assessment tool