Data from: A new population record of Critically Endangered Dipterocarpus bourdillonii Brandis from the Anamalai Tiger Reserve, Tamil Nadu

This dataset is based on the following manuscript/publication:
Page, N., S. Kasinathan, K. Bhat, G. Moorthi, T. Sundarraj, Divya Mudappa, and T. R. S. Raman (2022). A new population record of Critically Endangered Dipterocarpus bourdillonii Brandis from the Anamalai Tiger Reserve, Tamil Nadu. Journal of Threatened Taxa 14(8): 21651–21659. https://doi.org/10.11609/jott.7860.14.8.21651-21659

Please refer to the README.txt file included with the dataset for complete details and usage notes.

Geographic Coverage:
Location/Study Area: Valparai Plateau, Tamil Nadu, India; Anamalai Tiger Reserve, Tamil Nadu, India
GPS coordinates: Valparai Plateau (0°15'- 10°22'N, 76°52'-76°59'E); Anamalai Tiger Reserve (10°12'-10°35'N, 76°49'-77°24'E)

Temporal Coverage:
Begins: 2020-10-01 (Year, Month, Day)
Ends: 2022-05-31 (Year, Month, Day)

Funding:
Fondation Franklinia
AMM Murugappa Chettiar Research Centre
Rohini Nilekani Philanthropies

Dataset:

The dataset includes 7 files: 1 text file (README.txt), 5 data files in comma-delimited format (CSV), and 1 KML file of seven survey routes. Details of content of each CSV data file are provided below. The following files are included:
README.txt: Usage notes and metadata related to the dataset
1_Surveys_ver2.csv: Details of trails covered where Dipterocarpus bourdillonii was recorded during the survey
2_Focal_tree_data_ver2.csv: Details of focal trees of Dipterocarpus bourdillonii
3_Tree_centred_PCQ_ver2.csv: Data from point-centred quarter (PCQ) plots sampled with focal trees at the centre
4_Plant_checklist_ver2.csv: Checklist of plants (mainly trees) recorded on survey trails
5_Seed_fruit_ver2.csv: Measurements of fruits and seeds of Dipterocarpus bourdillonii
06_Dipterocarpus_bourdillonii_survey_trails.kml: This file includes the GPS tracks of the seven survey trails in KML format.

Details and data available in the columns in each of the above CSV files and the KML file are explained below.

1_Surveys_ver2.csv
Column: Description
Date: Date on which the survey was done
Place: Name of the place where the focal tree is located. e.g., Candura, Manamboli, Iyerpadi etc
Route_description:Description of place or route covered
Trail: Name of the tree survey trail
Trail_distance: Distance covered on the trail in kilometres (km)
Track_filename_kml: Name of the file with GPS track of survey trail/route, where available, in KML format
Observers: Names of observers who took measurements and filled datasheet during survey
Remarks: Notes and additional information

2_Focal_tree_data_ver2.csv
Column: Description
FT_ID: Unique numeric linking ID of each focal tree (NA for 3 individuals found in plots around other focal trees)
Species: Focal tree species
Date: Date on which the survey was done
Place: Name of forest range (Manamboli)
Waypoint: Unique location waypoint number for the focal tree and GPS instrument used
Time: Time when the focal tree's data was collected
Location: Landmark where the focal tree is located (NA, if not available)
Latitude: Latitude of the focal tree (decimal degrees N)
Longitude: Longitude of the focal tree (decimal degrees E)
Elevation: Elevation of the focal tree from sea-level in metres
Slope: Slope at focal tree location assessed with Clinometer, categorised as Flat, Gentle, Moderate, or Steep (NA, if not available)
ID_Notes: Any obvious signs with which to identify focal tree (NA, if not available)
Phenophase: Phenophase of the focal tree viz. leaf flush, buds/flowers, fruits (NA, if not available)
GBH: Girth of the focal tree in cm, at 1.3m from ground; measured from the higher side if tree is on slope
Tree_ht: Focal tree's height in m (NA, if not available)
Canopy_ht: Height of canopy in m where the focal tree is located (NA, if not available)
Substrate: Substrate where focal tree is standing viz. Earth, Rock, Streamside, Other (NA, if not available)
Invasives: List of invasive plant species present within 5 m radius around the focal tree (NA, if not available)
Stature: Stature of the focal tree relative to its surroundings (NOT of the species in general) categorised as Understorey, Mid, Canopy, Emergent (NA, if not available)
Relatively: Relative height of focal tree in relation to other trees within 10 m radius categorised as Shorter than most, Taller than most, Same height as most (NA, if not available)
Deadwood: Estimated percentage of deadwood present on the tree in 4 classes of <25%, 26-50%, 51-75%, 76-100% (NA, if not available)
Damage: Observed damages such as Main trunk broken, Branches broken, Hollow at base, Gaping cavity, Infected, Dried leaves (as on a dead branch) (NA, if not available)
Shape: Canopy shape of the focal tree (not species in general) categorised as Spreading, Oval, Fan, Column, Cone (NA, if not available)
Closure: Canopy closure due to foliage visually estimated standing next to trunk of focal tree and looking up, categorised as 0% (only sky and leafless branches visible), 1-25%, 26-50%, 51-75%, 76-100% (NA, if not available)
Seedlings: Count of conspecific seedlings (stems of girth at breast height <10 cm) around the focal tree in a 5 m radius (NA, if not available)
Saplings: Count of conspecific saplings (stems of girth at breast height 10-30 cm) around the focal tree in a 5 m radius (NA, if not available)
Trees: Count of conspecific trees (stems of girth at breast height >30 cm) around the focal tree in a 5 m radius (NA, if not available)
Remarks: Notes and additional information (NA, if not available)

3_Tree_centred_PCQ_ver2.csv
Column: Description
FT_ID: Unique numeric linking ID of each focal tree in point-centred quarter (PCQ) plot
Focal_tree: Scientific name of focal tree species at the centre of the PCQ plot
Species: Scientific name of tree species recorded in PCQ plot around focal tree
GBH (cm): Girth of PCQ tree in cm, at 1.3 m from ground; measured from the higher side if tree is on a slope. Main stem only.
Distance: Distance from focal tree, in m; measured from the approximate centre of bole to centre of bole and not bark to bark
Multistem: NA if single-stemmed; if multi-stemmed, then GBH of additional stems given as notes.

4_Plant_checklist_ver2.csv
Column: Description
Date: Date on which the survey was done
Place: Name of the place where the focal tree is located. e.g., Candura, Manamboli, Iyerpadi etc
Route: Route of the tree survey trail
Checklist_species: Scientific name of tree species observed as present along trail and within 10 m on either side
Remarks: Notes and additional information

5_Seed_Fruit_ver2.csv
Column: Description
Sample: Serial number of sample of single winged fruit measured
Species: Scientific name of tree species
No_Seeds: Unit number of seed measured
Fresh_fruit_weight_g: Weight of each fruit measured on an Ohaus scale in grams
Nut_length_cm: Length of nut along the longitudinal axis in cm
Nut_width_1_cm: Width of nut in cm measured along axis perpendicular to nut length
Nut_width_2_cm: Width of nut in cm measured along axis perpendicular to nut length and nut width 1
Wing1_length_cm: Length of longer wing (sepal) in cm
Wing1_width_cm: Width of longer wing (sepal) in cm
Wing2_length_cm: Length of shorter wing (sepal) in cm
Wing2_width_cm: Width of shorter wing (sepal) in cm

06_Dipterocarpus_bourdillonii_survey_trails.kml
This file includes the GPS tracks of the following seven trails in KML format:
   2021-01-30_Anali-Ayyankulam-Manamboli (Trail-2)
   2021-03-26_Ayyankulam (Trail-4)
   2021-04-10_Ayyankulam Parai (Trail-5)
   2022-03-07_Ayyankulam Parai to Ayyankulam_leftbank (Trail-8)
   2022-03-07_Ayyankulam Parai to Ayyankulam_rightbank (Trail-9)
   2022-03-09_Manamboli PH_leftbank (Trail-10)
   2022-03-09_Manamboli PH_rightbank (Trail-11)