Effectiveness of population recovery projects based on captive breeding

Adamski, Paweł; Witkowski, Zbigniew

doi:10.1016/j.biocon.2007.06.027

Cited by 19 publications

(33 citation statements)

References 12 publications

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“…After a drastic decline between 1960 and 1990 (Witkowski et al 1997), the population has been successfully restored to ca. 1000 mature individuals currently inhabiting an area of about 40 ha of a suitable habitat (Adamski and Witkowski 2007). Reports on the status of the population dating to the middle of 19-th century (Adamski and Witkowski 2007) indicate that the apollo butterfly was much more abundant then.…”

Section: Study Areamentioning

confidence: 99%

“…1000 mature individuals currently inhabiting an area of about 40 ha of a suitable habitat (Adamski and Witkowski 2007). Reports on the status of the population dating to the middle of 19-th century (Adamski and Witkowski 2007) indicate that the apollo butterfly was much more abundant then. Caterpillars of the apollo butterfly feed on the apical parts of shoots and younger leaves of S. maximum.…”

Section: Study Areamentioning

confidence: 99%

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Overcompensation in response to simulated herbivory in the perennial herb Sedum maximum

Olejniczak

2011

Plant Ecol

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A positive effect of herbivory on plant reproduction (overcompensation) has been documented mostly in monocarpic plants. Iteroparous perennials can be used to test whether enhanced reproduction in 1 year has negative future consequences as predicted by optimal allocation models. This study was intended to verify this prediction in the iteroparous herb Sedum maximum, applying mechanically simulated herbivory. I monitored 132 labelled S. maximum individuals during 2 years of study. They were randomly assigned to two groups: clipped and control. Infructescence dry mass, total seed dry mass, seed size, germination rate and an increase of root dry mass during the season were assessed in the experimental plants. Since only roots can survive to the next season, root dry mass was considered a reliable measure of allocation to future performance. Clipped plants showed increased fruit and seed dry mass versus the controls, with no other aspect of reproduction affected. Apical bud removal also had a positive effect on increase of root dry mass. The results indicate true overcompensation in response to simulated herbivory with no future costs of increased reproduction. Moreover, increased plant reproduction as a result of herbivory is likely to persist in the following years: clipping increased not only seed production but also root growth. This response is inconsistent with the results of optimal allocation models and the discrepancy is probably due to violation of the resource limitation assumption. Plants adapted to tolerate herbivory seem not to reproduce at the maximum rate when undamaged, but rather withhold resources to be allocated to reproduction after herbivory.

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Section: Study Areamentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Overcompensation in response to simulated herbivory in the perennial herb Sedum maximum

Olejniczak

2011

Plant Ecol

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“…The spatio-temporal approach, the core of the metapopulation theory (Gilpin and Hanski 1991;Hanski et al 1996;Schnell et al 2013;Porter and Ellis 2011), primarily addresses the relation between habitat structure and population dynamics (Gering et al 2003;Hughes et al 2000;Bulman et al 2007). It enables a more reliable description of a population's decline, and the subsequent design of effective conservation measures (Harrison 1991;Adamski and Witkowski 2007;Cormont et al 2011;Hanski 2011). In conservation practice, however, application of the metapopulation model is often limited by gaps in the knowledge of both population dynamics parameters and the habitat requirements of species (Cushman 2006;Rudnick et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…The presence of ecological traps in an area inhabited by a population causes the quality of the local habitat to deteriorate, even though other parameters, such as the availability of critical resources, are maintained. As habitat quality is considered to be the key factor responsible for the success of conservation efforts related to insect populations (Adamski and Witkowski 2007;Sutherland et al 2013), it is important to recognise whether it is impoverished by ecological traps.…”

Section: Introductionmentioning

confidence: 99%

Potential range of impact of an ecological trap network: the case of timber stacks and the Rosalia longicorn

Adamski

Michalcewicz²,

Bohdan³

et al. 2018

J Insect Conserv

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Although the negative impact of timber stacks on populations of saproxylic beetles is a well-known phenomenon, there is relatively little data concerning the scale of this impact and its spatial aspect. Beech timber stored in the vicinity of the forest can act as an ecological trap for the Rosalia longicorn (Rosalia alpina), so in this study we have attempted to determine the spatial range of the impact of a network of timber stacks. Timber stacks in the species' range in the study area were listed and monitored during the adult emergence period in 2014-2016. Based on published data relating to the species' dispersal capabilities, buffers of four radii (500, 1000, 1600, 3000 m) were delineated around the stacks and the calculated ranges of potential impact. The results show that the percentage of currently known localities of the Rosalia longicorn impacted by stacks varies from 19.7 to 81.6%, depending on the assumed impact radius. The percentage of forest influenced by timber stacks was 77% for the largest-radius buffer. The overall impact of the ecological trap network is accelerated by fragmentation of the impact-free area. It was also found that forests situated close to the timber stacks where the Rosalia longicorn was recorded were older and more homogeneous in age and species composition than those around stacks where the species was absent. Such results suggest that timber stacks act as an ecological trap in the source area of the local population.

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“…Quite surprisingly, the above prediction has not been investigated empirically so far, although some indirect evidence provides support for its validity (Dempster 1991;Adamski and Witkowski 2007). Therefore, our aim was to test the prediction by comparing dispersal parameters derived for isolated and non-isolated metapopulations.…”

Section: Introductionmentioning

confidence: 99%

Selection on dispersal in isolated butterfly metapopulations

et al. 2013

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In most metapopulation models dispersal is assumed to be a fixed species-specific trait, but in reality dispersal abilities are highly sensitive to various selective pressures. Strict isolation of a metapopulation, which precludes any influx of immigrants (and their genes) from outside and makes it impossible for emigrants to reach other localities with suitable habitat, thus reducing fitness benefits of long-distance dispersal to zero, may be expected to impose strong selection against dispersal. We tested the above prediction by comparing dispersal parameters derived with the Virtual Migration model for isolated and non-isolated metapopulations of two species of large blue Maculinea (= Phengaris) butterflies, surveyed with intensive mark-recapture. Mortality during dispersal was found to be twice (in M. teleius) to five times higher (in M. arion) in isolated metapopulations. Isolation also resulted in significantly reduced dispersal distances in isolated metapopulations, with the effect being particularly strong in M. arion females. Apart from its evolutionary and ecological consequences, dispersal depression in isolated butterfly metapopulations implied by our results has serious conservation implications. It provides a clear argument against using parameter values obtained in a different environmental setting in modelling applications, e.g., Population Viability Analyses or environmental impact assessment. Furthermore, it underlines the importance of establishing well-connected networks of suitable habitats prior to species release in areas where reintroductions are planned.

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Effectiveness of population recovery projects based on captive breeding

Cited by 19 publications

References 12 publications

Overcompensation in response to simulated herbivory in the perennial herb Sedum maximum

Overcompensation in response to simulated herbivory in the perennial herb Sedum maximum

Potential range of impact of an ecological trap network: the case of timber stacks and the Rosalia longicorn

Selection on dispersal in isolated butterfly metapopulations

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