Dataset of Iberian ibex population in Sierra Nevada (Spain)
This dataset provides long-term information about Iberian ibex (Capra pyrenaica hispanica Schimper, 1848) presence in Sierra Nevada (SE Iberian Peninsula), as a result of annual sampling from 1993 to 2018 done by the managers of the Sierra Nevada Natural and National Park. They carried out the transects collecting different variables such as the number of individuals observed, the perpendicular distance of each group of goats to the transect line and, at an individual level and sex as well as age of individuals in the case of males. These data enabled the calculation of population parameters such as density, sex ratio, birth rate and age structure. These parameters are key for Iberian ibex conservation and management, given that Sierra Nevada harbours the largest population of this species in the Iberian Peninsula. The data set we present is structured using the Darwin Core biological standard, which contains 3,091 events (582 transect walk events and 2,509 group sighting events), 5,396 occurrences, and 2,502 measurements. The occurrences include the sightings of 11,436 individuals (grouped by sex and age) from 1993 to 2018 in a total of 88 transects distributed along Sierra Nevada, of which 33 have been continuously sampled since 2008.
Granados Torres J E (2021): Dataset of Iberian ibex population in Sierra Nevada (Spain). v1.8. Sierra Nevada Global Change Observatory. Andalusian Environmental Center, University of Granada, Regional Government of Andalusia. Dataset/Samplingevent. https://doi.org/10.15470/3ucqfm
此資料的發布者及權利單位為 Sierra Nevada Global Change Observatory. Andalusian Environmental Center, University of Granada, Regional Government of Andalusia。 To the extent possible under law, the publisher has waived all rights to these data and has dedicated them to the Public Domain (CC0 1.0). Users may copy, modify, distribute and use the work, including for commercial purposes, without restriction.
此資源已向GBIF註冊，並指定以下之GBIF UUID: 5fe81b76-6d2f-4f09-a9e3-301e8e1eb918。 Sierra Nevada Global Change Observatory. Andalusian Environmental Center, University of Granada, Regional Government of Andalusia 發佈此資源，並經由GBIF Spain同意向GBIF註冊成為資料發佈者。
Capra pyrenaica; Sierra Nevada; long term monitoring; population parameters; Iberian Peninsula; demographic time series; population trends; demographic structure; National Park; conservation and management; Capra pyrenaica; Sierra Nevada; Long term monitoring; Population parameters; Iberian Peninsula; Population trends; National Park; Conservation and management; Distance sampling; FAIR principles; Historical monitoring data; Southern Spain
The geographical area where the dataset was obtained corresponds to Sierra Nevada: a mountainous region located in the south-east Iberian Peninsula (37°14'-36°54' N; 2°37'-3°39' W) within the Baetic System, in the called Penibaetic mountain ranges, near to the Mediterranean Sea. Sierra Nevada has the highest summits of the Iberian Peninsula, the peak Mulhacén reaching 3,479 m a.s.l., making this the second-highest mountain range in mainland Europe, after the Alps.
|界定座標範圍||緯度南界 經度西界 [36.901, -3.564], 緯度北界 經度東界 [37.19, -2.63]|
The Iberian ibex (Capra pyrenaica hispanica) is an endemic mountain and intermediate sized ungulate, widely distributed throughout much of the Mediterranean mountain ranges of the Iberian Peninsula.
|Subspecies||Capra pyrenaica hispanica (Iberian ibex)|
|起始日期 / 結束日期||1993-07-08 / 2018-11-07|
The main goal of these projects is to monitor ungulate populations in Sierra Nevada National Park.
|計畫名稱||Plan de Gestión de Ungulados Silvestres en el Parque Nacional de Sierra Nevada|
|辨識碼||30_00; 10050010; 10040016; 676/2006/A/00; 1571/2007/M/00; 173/2009/M/00; 861/11/M/00; 03/15/M/00; 2016 _00014_M; 2017-00189-M|
|研究區域描述||The climate is Mediterranean; its mountainous condition gives it the characteristics of a continental climate. Biogeographically, five of the six thermotypes defined for the Mediterranean region appear in Sierra Nevada, from the thermomediterranean in the lowest and driest areas of the east to the cryoromediterranean in the highest peaks (Rivas-Martínez, 1987). The mean precipitation gives rise to a dry and subhumid ombrotype, although there are exceptions due to extreme drought (eastern part) and to areas with mean precipitation of more than 1,000 mm/year. Topographically is a heterogeneous area, with strong climatic contrasts between the sunny, dry south-facing slopes and the shaded, wetter north-facing slopes. Sierra Nevada is an important diversity hotspot in the Mediterranean region, with unique ecosystems and endemic species. Overall, Sierra Nevada comprises 27 habitats types from the habitat directive (Annex I of Directive 92/43/CEE). The mountain goat is distributed in Sierra Nevada from the summits to the bottom of the valleys, depending on the seasonality of the ecosystem.|
|研究設計描述||Four different stages in the monitoring of the ibex population can be considered chronologically in Sierra Nevada, characterized by changes in environmental-protection categories and the methodology used to estimate the number of individuals. An initial stage (19th century to first half of the 20th century) includes ibex presence or absence data in particular sites of Sierra Nevada. The second stage (1960-1996) comprises the population inventories of the number of ibex present in the 35,000 hectares of the former National Hunting Reserve. The third stage began in 1989 with the declaration of Sierra Nevada as a Natural Park, with an area of ca. 172,000 hectares, where Distance Sampling has been undertaken since 1993 to estimate the size of this ibex population. The fourth stage began in 1999 with the declaration of part of Sierra Nevada mountain range as a National Park. This new category of protection has not entailed changes in the methodology used to estimate population size, although it has implied a new management model combining one territory where sport hunting is prohibited (National Park) with another where this activity is permitted (Natural Park). This sector has been favoured by improved management of the species as a whole.|
Sampling based on linear transects has been used since the early 1930s. This method has proved practical, efficient, and relatively inexpensive (Anderson et al. 1979; Burnham et al. 1980). In addition, it has been recommended because it provides the ability to control the reliability of the results (Burnham et al. 1980), this being the main reason for using the Distance Sampling in the census of wild ungulates (Escós and Alados, 1988; Fandos, 1991). In Sierra Nevada, the linear transects method for estimating the size of the ibex population was first used in 1993 (Pérez et al. 1994). A more detailed explanation of the methodology can be found in the Plan específico de gestión de la población de cabra montés (Capra pyrenaica) en el Parque Nacional de Sierra Nevada (Granados et al. 2001) (Specific Management Plan for the Iberian ibex [Capra pyrenaica] population in Sierra Nevada National Park) and in the monitoring methodologies of the Sierra Nevada Global-Change Observatory (Granados et al. 2012). The sampling design (length and location of transects) was carried out following criteria of randomness and stratification. Although a total of 88 transects were sampled throughout the monitoring since 1993, not all of them were sampled every year: before 2008 due to methodological changes and after 2008 due only to weather conditions. This means that the transects designs were made uniform as of 2008, when 33 transects were fixed and were the only ones constantly sampled from 2008 onwards. Overall, one sampling was conducted annually, although in 1995 two samplings were undertaken (summer and autumn) but none in 1994, 1999, 2005, or 2006. The first years the surveys were conducted in summer so that snowfall would not prevent sampling. From 2008 onwards, the 33 fixed transects are sampled annually in autumn whenever the weather conditions allow. Transects are sampled in autumn (before the oestrous cycle), when animals are more active and more easily observed, offering greater probabilities of detecting animals.
|研究範圍||A total of 88 transects were sampled since 1993, of which 33 have been continuously sampled since 2008. They were classified by the most predominant habitats in the area covered by each transect. Type of habitats are forest, high mountain grasslands, high mountain shrubland, high mountain shrubland and forest, high mountain shrubland and high mountain grasslands, mountain crops, mid mountain scrubland and finally mid mountain scrubland and forest. The representation of the shape (multilinestring) can be found in the footprintWKT element of Darwing Core.|
|品質控管||Different validation processes were applied in the data cycle stages described below: (a) Field data collection in surveys. During the sampling, the observers fundamentally cross-checked the sightings in situ. (b) Digitalisation and storage in an Access database. In this second step, due to the large volume of data, we implement some controls and validation rules in the Access form in order to reduce human errors and facilitate the digitalisation: - Input masks to control data entry formats (especially date/time data type). - We defined required fields (e.g. transect number and sampling date). - We made lists of predefined values (e.g. group types: male alone, female alone, males, females, females with kids, and mixed groups). - We established some “control fields”, that is, variables that whoever digitalise the data calculated manually to facilitate the information identification. For instance: before introducing the observations, the person had to indicate the total number of groups identified in each survey; the size of each group; the type of group categorised by sex and age; etc. As for transects, a more accurate digitalisation was carried out at a scale of 1:1000 in ArcGIS 10.2 (ESRI, 2013), using as cartographic base the orthophotos from PNOA (Spanish National Program for Aerial Orthophoto). (c) Debugging and disaggregation. The data were processed through the PostgreSQL relational database management system (RDBMS) version 11.3 (PostgreSQL Global Development Group, 2013) together with R version 3.6.0 (R Core Team, 2019) using the package Rpostgres (Wickham et al. 2018) and the spatial extension PostGIS version 2.5.2 (PostGIS Project Steering Committee, 2019), in addition to other packages: DBI (R-SIG-DB, 2018), knitr (Xie, 2019), dplyr (Wickham et al. 2019) and splitstackshape (Mahto, 2019). In this way, we created a validation process in R and SQL code to check specific errors derived from digitalisation and corrected them. When it was necessary, the surveys were re-checked and we ran several validation rounds were run. Specific examples are given below: - We checked if all the information was associated: samplings without any observers assigned, groups that had no observations assigned, etc. - Regarding null values, we checked if all the essential variables were filled out, e.g. males without age variable, groups without size value, etc. - We identified if there was duplicated information. - We revised if there were incongruous data, e.g. the hour when a group was observed had to be between the start and end time of sampling. - We also checked the “control fields” because they were susceptible to contain errors, e.g. the automatic sum of individuals did not match the indicated group size; groups categorised as mixed should be males and females with kids, etc. (d) The standardisation to Darwin Core was done according to the practices recommended by the TDWG guidelines (https://dwc.tdwg.org/terms/).|
- In each sampling, the observers walk the linear transects taking notes on the ibex groups sighted and collecting different variables such as: the number of individuals observed (group size); the contact hour; and perpendicular distance of each group of goats to the transect line. At the individual level, records are made of physical condition (mainly the presence of lesions caused by sarcoptidosis), the sex of each ibex, and the age in the case of the males. In addition, the date as well as the starting and ending times of the sampling are also recorded, as well as the identity of the observers. The transects are sampled by two or more observers, on foot or by vehicle, when terrain conditions allow, at a speed of no more than 15 km/h. The sampling time is adapted to the dates when the field work is carried out, recording the official time in the surveys. In summer time, the observers walk the transects mainly at dawn and dusk. In the other seasons, the sampling time is extended throughout the day. The optical materials used are binoculars (8 x 35) and a telescope (20 x 40). When circumstances prevent a satisfactory viewing (individuals far away or hidden by the surrounding vegetation, temporary brevity of contact, etc.) sightings are not taken into account. The probability of detecting an individual is related to spatial distribution of the sightings (Buckland et al. 2004) and visibility conditions, habitat coverage, land topography, animal and group size, as well as the density. The method assumes that, if the density is high, many individuals will be sighted up close. If the density is low, only a few individuals will be sighted, and far away. The following premises must be assumed: animals on the transect line are always observed; animals must be immobile when they are observed or located on the spot before they move; no animal should be counted twice; distances and sighting angles must be calculated accurately and sightings are independent events. With all these data collected, the parameters that define the population were: density (number of individuals/km²), sex ratio (number of females/number of males), birth rate (number of kids/number of adult females) and age pyramid mainly for males, in which the size of the horns and body morphology make it easier to determine the years of age or age class to which they belong.
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