DOI: 10.5061/dryad.c2fqz61pg
title: Taking stock after six years – the first results of an ongoing project to establish new populations of a regionally endangered grasshopper

description: This data represents the sum of specimens translocated in each occasion
 between 2018 and 2024 from natural source populations of the large banded
 grasshopper (Arcyptera fusca, Acrididae, Orthoptera) in Bükk and Börzsöny
 Mountains, NE Hungary, to altogether 5 recipient sites in the same
 mountain ranges, and the estimation of the newly established populations
 during a subsequent monitoring year by year in each recipient site. This
 study was conducted in a species conservation project in Hungary, where
 the main aim was to establish new populations of the regionally endangered
 large bandad grasshopper there. A. fusca individuals were translocated to
 five mountain meadows from nearby source populations, in some cases with
 repeated translocations of smaller numbers (30-50 individuals) between
 2018 and 2024. The size of the new populations was estimated yearly by the
 transect method. We estimated the population size on each occasion by
 multiplying the number of individuals detected in the transects by the
 ratio of the total area of habitat to the transect area. By 2024, a new,
 growing population will exist in Bükk and another one in Börzsöny Mts.
 These are considered successful translocations. At two other sites, the
 success is questionable, as there is a small population at each, but it is
 not yet possible to determine a trend. At the fifth site, the first
 translocation attempt in 2023 was unsuccessful and was repeated in 2024
 with a larger number of individuals.
description: # Taking stock after six years – the first results of an ongoing project
 to establish new populations of a regionally endangered grasshopper
 Dataset DOI: [10.5061/dryad.c2fqz61pg](10.5061/dryad.c2fqz61pg) ##
 Description of the data and file structure This data represents the sum of
 specimens translocated in each occasion between 2018 and 2024 from natural
 source populations of the large banded grasshopper (*Arcyptera fusca*,
 Acrididae, Orthoptera) in Bükk and Börzsöny Mountains, NE Hungary, to
 altogether five recipient sites in the same mountain ranges, and the
 estimation of the newly established populations during a subsequent
 monitoring year by year in each recipient site. ### Files and variables
 #### File: Arcyptera_fusca_population_data.xlsx **Description:** The size
 of the newly established *Arcyptera fusca* populations was estimated after
 the first translocation's year yearly by transect method. We
 estimated the population size on each occasion by multiplying the number
 of individuals detected in the transects by the ratio of the total area of
 suitable habitat to the transect area. Missing information represented as
 n.a. ##### Variables * year: The year in which population estimation took
 place in the given site. - individuals detected in the transect: The
 number of individuals detected in the stripe transect in given site. *
 area (square metres) covered by transect: The total area covered by the
 stripe transect in the given year in the given recipient site. - extension
 of suitable habitats (square metres): The extension of the suitable
 habitats in the given site. * population size estimated: Population size
 estimation in the given year in the given site calculated by multiplying
 the number of individuals detected in the transect by the ratio of the
 total area of suitable habitat to the area covered by the transect. ####
 File: Arcyptera_fusca_translocation_data.xlsx **Description:** *Arcyptera
 fusca* individuals were translocated to five mountain meadows from nearby
 source populations, in some cases with repeated translocations of smaller
 numbers between 2018 and 2024. Number of individuals (males and females
 separated) translocated in each year are given in the table. #####
 Variables * year: The year(s) in which translocation took place at the
 given site. - males: The number of male individuals translocated in a
 given year in a given site. * females: The number of female individuals
 translocated in a given year in a given site.