Dataset Information

Metapopulation dynamics over 25 years of a beetle, Osmoderma eremita, inhabiting hollow oaks.

ABSTRACT: Osmoderma eremita is a species of beetle that inhabits hollows in ancient trees, which is a habitat that has decreased significantly during the last century. In southeastern Sweden, we studied the metapopulation dynamics of this beetle over a 25 year period, using capture-mark-recapture. The metapopulation size had been rather stable over time, but in most of the individual trees there had been a positive or negative trend in population development. The probability of colonisation was higher in well-connected trees with characteristics reflecting earlier successional stages, and the probability of extinction higher in trees with larger diameter (i.e. in later successional stages), which is expected from a habitat-tracking metapopulation. The annual tree mortality and fall rates (1.1% and 0.4%, respectively) are lower than the colonisation and extinction rates (5-7%), indicating that some of the metapopulation dynamics are due to the habitat dynamics, but many colonisations and extinctions take place for other reasons, such as stochastic events in small populations. The studied metapopulation occurs in an area with a high density of hollow oaks and where the oak pastures are still managed by grazing. In stands with fewer than ten suitable trees, the long-term extinction risk may be considerable, since only a small proportion of all hollow trees harbours large populations, and the population size in trees may change considerably during a decade.

SUBMITTER: Lindman L

PROVIDER: S-EPMC7683440 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Metapopulation dynamics over 25 years of a beetle, Osmoderma eremita, inhabiting hollow oaks.

Lindman Ly L Larsson Mattias C MC Mellbrand Kajsa K Svensson Glenn P GP Hedin Jonas J Tranberg Olov O Ranius Thomas T

Oecologia 20201107 4

Osmoderma eremita is a species of beetle that inhabits hollows in ancient trees, which is a habitat that has decreased significantly during the last century. In southeastern Sweden, we studied the metapopulation dynamics of this beetle over a 25 year period, using capture-mark-recapture. The metapopulation size had been rather stable over time, but in most of the individual trees there had been a positive or negative trend in population development. The probability of colonisation was higher in ...[more]

PMID: 33159540

Similar Datasets

Project description:Veteran hollow oaks (Quercus spp.) are keystone structures hosting high insect diversity but are declining in numbers due to intensification of land use and the abandonment of traditional management. The loss of this vital habitat is resulting in a reduction of biodiversity, and this likely has consequences for ecosystem functioning, especially if functional diversity is reduced. A considerable amount of research has been done on predictors of beetle taxonomic diversity in veteran oaks, but predictors of functional diversity have remained largely unexplored. The aim of this study was to establish whether the features and surroundings of veteran oaks are related to functional diversity within three functional groups of beetles (decomposers, predators, and flower visitors) and determine whether species richness and functional diversity within the groups are dependent on the same predictors. Sampling was carried out intermittently between 2004 and 2011 on 61 veteran oaks in Southern Norway. Of the 876 beetle species that were collected, 359 were determined to be decomposers, 284 were predators, and 85 were flower visitors. Species richness and functional diversity in all groups were consistently higher in traps mounted on veteran oaks in forests than in open landscapes. However, additional predictors differed between groups, and for species richness and functional diversity. Decomposer species richness responded to tree vitality, while functional diversity responded to habitat connectivity, predator species richness responded to regrowth of shrubs while functional diversity responded to tree circumference, and flower visitor richness and functional diversity did not respond to any additional predictors. Previous studies have found that the features and surroundings of veteran oaks are important for conservation of taxonomic diversity, and the results from this study indicate that they are also important for functional diversity within multiple functional groups.

Project description:Habitat fragmentation and climate change are both prominent manifestations of global change, but there is little knowledge on the specific mechanisms of how climate change may modify the effects of habitat fragmentation, for example, by altering dynamics of spatially structured populations. The long-term viability of metapopulations is dependent on independent dynamics of local populations, because it mitigates fluctuations in the size of the metapopulation as a whole. Metapopulation viability will be compromised if climate change increases spatial synchrony in weather conditions associated with population growth rates. We studied a recently reported increase in metapopulation synchrony of the Glanville fritillary butterfly (Melitaea cinxia) in the Finnish archipelago, to see if it could be explained by an increase in synchrony of weather conditions. For this, we used 23 years of butterfly survey data together with monthly weather records for the same period. We first examined the associations between population growth rates within different regions of the metapopulation and weather conditions during different life-history stages of the butterfly. We then examined the association between the trends in the synchrony of the weather conditions and the synchrony of the butterfly metapopulation dynamics. We found that precipitation from spring to late summer are associated with the M. cinxia per capita growth rate, with early summer conditions being most important. We further found that the increase in metapopulation synchrony is paralleled by an increase in the synchrony of weather conditions. Alternative explanations for spatial synchrony, such as increased dispersal or trophic interactions with a specialist parasitoid, did not show paralleled trends and are not supported. The climate driven increase in M. cinxia metapopulation synchrony suggests that climate change can increase extinction risk of spatially structured populations living in fragmented landscapes by altering their dynamics.

Project description:This study aimed to review and evaluate our experience in 750 patients, who underwent transhiatal esophagectomy (THE) and analyze our data. Special attention was paid to some strategies, which we developed in the course of time, regarding the postoperative management of these patients and formulation of improved guidelines.This is a retrospective analysis of all THE operations performed between January 1981 until May 2007 in 750 patients: 60 patients (8%) had benign lesions, while 690 (92%) had malignant ones (5.2% of malignancies were located in the upper esophagus, 7.4% in the middle esophagus, 19% in the lower esophagus, and 68.4% at the cardioesophageal junction). THE and esophageal reconstruction were performed at the same operation in all patients. The stomach was our esophageal substitute of first choice with the colon and jejunum being acceptable alternatives in patients with prior gastric surgery and those necessitating synchronous gastrectomy for cancer invasion. A gastric tube was used as an esophageal substitute in 624 patients (83.2%), the whole stomach in 70 (9.4%), the colon in 43 (5.73%), and a jejunal loop in 13 (1.73%).The overall in-hospital mortality rate was 2.93% (22 patients). There was no intraoperative death. Major complications included atelectasis or pneumonia (4.8%), pleural effusion (22.7%), myocardial infarction (0.5%), recurrent laryngeal nerve paralysis (1.33%), and three tracheal lacerations (0.4%). The anastomotic leak rate decreased gradually over time from 29.4% to 11.1% in the last 6 years. The average intraoperative blood loss was 315 ml and 82% of the patients did not receive any blood transfusion. Late functional results were good or excellent in 93%. The average length of hospital stay was 11 days and intensive care unit stay was 2.3 days. The actuarial 5-year survival rate after THE for carcinoma was 21%.THE is a safe and effective method of esophageal resection with low morbidity and mortality rates and good functional results when performed by experienced surgeons. We believe that our strategies concerning the way of dissecting the cervical esophagus, avoidance of performing pyloromyotomy, the delayed removal of the cervical drain and the delayed advance to oral feeding have reduced, noticeably, morbidity and mortality in our series.

Dataset Information

Metapopulation dynamics over 25 years of a beetle, Osmoderma eremita, inhabiting hollow oaks.

Publications

Metapopulation dynamics over 25 years of a beetle, Osmoderma eremita, inhabiting hollow oaks.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets