https://ipt.nlbif.nl/resource?r=boe_guinee-bissau_line-transects Boe=Guinea_Bissau-Line_tranects Joost van Schijndel Chimbo Foundation

GW

Annemarie Goedmakers Chimbo Foundation 2026-09-24 eng This dataset presents line-transect survey data collected in the Boe sector, Gabu Region, southeastern Guinea-Bissau, in 2014, as part of field monitoring following the Pan African Programme's standardized survey protocol for great apes and associated fauna. Fourteen fixed ~3,750 m transects (L1N/S through L7N/S) were each walked one to three times during 2014. Observers recorded every direct sighting and indirect sign (nests, dung, footprints, vocalisations, feeding remains, tool-use evidence) of western chimpanzees (Pan troglodytes verus) and other medium/large mammals encountered along each transect, together with the perpendicular distance to each detection, GPS location, and habitat type. Each transect walk (transect x round) is a parent Event; each recorded waypoint along that walk is a child Event. Species detections are linked via the Occurrence extension. Because each transect walk has an explicit, reported taxonomic scope (medium/large Mammalia, chiefly P. t. verus), non-detection of a species that was recorded elsewhere in the Boe dataset during that walk is published as an explicit dwc:occurrenceStatus = absent record, following GBIF's Humboldt Extension for Ecological Inventories guidance. Quantitative measurements (perpendicular distance, tool dimensions, transect length) are published via the Extended MeasurementOrFact extension. NOTE ON ABSENCE INFERENCE: the target species pool used to infer absence is restricted to the 34 species/taxa actually detected somewhere in the Boe line-transect dataset during 2014-2015. chimpanzee Pan troglodytes verus line transect distance sampling Guinea-Bissau Boe Samplingevent GBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type.xml Samplingevent GBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type_2015-07-10.xml Observation GBIF Dataset Subtype Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_subtype.xml This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License. Creative Commons Attribution 4.0 International https://spdx.org/licenses/CC-BY-4.0.html CC-BY-4.0 Boe sector, Gabu Region, southeastern Guinea-Bissau (Boe National Park and surrounding forest-savannah mosaic) -14.3 -13.6 12.1 11.7 2014-01-01 2014-12-31 Medium and large Mammalia, with a primary focus on Pan troglodytes verus (western chimpanzee); incidental records of other vertebrates and human activity signs. class Mammalia species Pan troglodytes verus Western Chimpanzee TODO: e.g. "completed" or "ongoing" depending on whether more Boe survey years will be added. notPlanned Annemarie Goedmakers Chimbo Foundation

Huningspaed 6 Oudemirdum 8567 LL NL

+31-6-17280797 +245-955.521.674 +245-966.726.916 annemarie@goedmakers.nl info@chimbo.org https://www.chimbo.org/ Fourteen fixed transects (L1N, L1S ... L7N, L7S), each approximately 3,750 m long, were pre-cut through the Boe survey area to sample the range of habitats present (forest, forest-on-rock, gallery forest, savannah, fallow, marshes). Each transect was walked slowly by a team including at least one trained observer and local field assistants. All direct sightings and indirect signs of chimpanzees and other medium/large mammals within visual range of the line were recorded, together with GPS waypoint, perpendicular distance from the line, habitat at the point of detection, and (for chimpanzee nests) decay stage. Each transect was walked one to three times during 2014 (rounds 1-3). Weather conditions, start/end times, and the field team were logged for each walk. Boe sector line-transect network, 2014 field season. Standardised line-transect distance sampling; see dwc:samplingProtocol and the Humboldt extension eco:protocolDescriptions field in event.txt for per-event detail. Joost van Schijndel principalInvestigator 2026-09-22T12:39:29.744+00:00 dataset van Schijndel J, Goedmakers A (2026). Line transect surveys of chimpanzees (Pan troglodytes verus) and other medium/large mammals in Boe, Guinea-Bissau, 2014. Version 1.0. Chimbo. Samplingevent dataset. https://ipt.nlbif.nl/resource?r=boe_guinee-bissau_line-transects&v=1.0