Persistence and conservation of a consumer–resource metapopulation with local overexploitation of resources

Johst, Karin; Schöps, Katrin

doi:10.1016/s0006-3207(02)00133-7

Cited by 26 publications

(26 citation statements)

References 46 publications

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“…We demonstrate here that even in homogenous environments bimodality can occur due to time scale differences of the successional process (for the importance of scales see also, e.g. Smith & Urban, 1988;Levin, 1992;Turner et al, 1993;Wu & Levin, 1994;Levin, 2000; Whittaker et al, 2001;Johst & Schöps, 2003;Sheil & Burslem, 2003;Roxburgh et al, 2004). As the number of successional stages was not decisive for detecting two peaks, in Fig.…”

Section: Discussionsupporting

confidence: 53%

Testing the intermediate disturbance hypothesis: when will there be two peaks of diversity?

Johst

Huth

2005

Diversity and Distributions

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Succession after disturbances generates a mosaic of patches in different successional stages. The intermediate disturbance hypothesis predicts that intermediate disturbances lead to the highest diversity of these stages on a regional scale resulting in a hump-shaped diversity-disturbance curve. We tested this prediction using field data of forest succession and hypothetical succession scenarios in combination with analytical and simulation models. According to our study the main factors shaping the diversity-disturbance curve and the position of the diversity maximum were the transition times between the successional stages, the transition type, neighbourhood effects and the choice of diversity measure. Although many scenarios confirmed the intermediate disturbance hypothesis we found that deviations in the form of two diversity maximums were possible. Such bimodal diversity-disturbance curves occurred when early and late successional stages were separated by one or more long-lived (compared to the early stages) intermediate successional stages. Although the field data which met these conditions among all those tested were rare (one of six), the consequences of detecting two peaks are fundamental. The impact of disturbances on biodiversity can be complex and deviate from a hump-shaped curve.

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Section: Discussionsupporting

confidence: 53%

Testing the intermediate disturbance hypothesis: when will there be two peaks of diversity?

Johst

Huth

2005

Diversity and Distributions

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“…dieffenbachii system, it would be instructive to further explore the factors influencing its persistence. Since a long-term study of the coastal plant and weevil populations would be extremely difficult (most patches are located down steep cliffs) a spatially explicit model would be very useful to identify the mechanisms for regional persistence of this locally unstable consumer-resource system (Johst and Schöps 2002). The model could assist in comparing the recently established grassland population with the original cliff population and help to develop specific conservation measures.…”

Section: Discussionmentioning

confidence: 99%

Local and regional dynamics of a specialist herbivore: overexploitation of a patchily distributed host plant

Schöps

2002

Oecologia

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This study reports a rare example where a native herbivorous insect frequently overexploits local populations of its perennial host. Local dynamics of a flightless weevil (Hadramphus spinipennis, Curculionidae) and its host plant (Aciphylla dieffenbachii, Apiaceae) were assessed for one discrete patch. In this main study site local weevil population structure, dynamics and movement were investigated using a capture-recapture study. Local plant dynamics were studied by mapping plant location, size, sex and the phenological stage of each plant. Regional weevil and plant dynamics were studied for six plant patches using line-transect counts to estimate local weevil numbers and repeated counts of the number of flowering adult plants to assess plant numbers. Dispersal was assessed by regularly searching all plant patches for marked weevils that emigrated from the main study site. Prior to extinction, local weevil abundance, survival and recruitment rates increased continuously. At the same time the feeding damage on the plants increased and the area covered by A. dieffenbachii decreased until no plants were left. An increase in weevil abundance was clearly associated with the extinction of the local host plant population. Weevils stayed in their local host plant patch whilst food was available and dispersed only after local extinction of the plant. Over a 4-year period four local population extinctions were observed. This study was too short to allow explicit conclusions to be drawn about the ratio of extinction to colonisation rates for both the weevil and the host plant populations. However, persistence of this locally unstable system appears possible only in a fragmented habitat where asynchrony in local dynamics is maintained.

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“…These include genera, such as Inosomus Broun, Xenocnema Wollaston, Novitas Broun (Cossoninae), Bantiades Broun, Etheophanus Broun, Phronira Broun (Molytinae), Philacta Broun (Eugnomini), Abantiadinus Schenkling (Storeini), and Myrtonymus Kuschel (Myrtonomini) [89]. Several other endemic weevils have been the focus of ecological research, including sexual selection [90,91] and population dynamics [92]. A sound taxonomic and systematic foundation will unlock the potential of this fascinating fauna for informing more biogeographic, evolutionary and ecological hypotheses.…”

Section: A Biogeographic Overview Of the New Zealand Weevil Fauna (Samentioning

confidence: 99%

Morphological and Molecular Perspectives on the Phylogeny, Evolution, and Classification of Weevils (Coleoptera: Curculionoidea): Proceedings from the 2016 International Weevil Meeting

et al. 2018

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Abstract:The 2016 International Weevil Meeting was held immediately after the International Congress of Entomology (ICE). It built on the topics and content of the 2016 ICE weevil symposium Phylogeny and Evolution of Weevils (Coleoptera: Curculionoidea): A Symposium in Honor of Dr. Guillermo "Willy" Kuschel. Beyond catalyzing research and collaboration, the meeting was intended to serve as a forum for identifying priorities and goals for those who study weevils. The meeting consisted of 46 invited and contributed lectures, discussion sessions and introductory remarks presented by 23 speakers along with eight contributed research posters. These were organized into three convened sessions, each lasting one day: (1) weevil morphology; (2) weevil fossils, biogeography and host/habitat associations; and (3) molecular phylogenetics and classification of weevils. Some of the topics covered included the 1K Weevils Project, major morphological character systems of adult and larval weevils, weevil morphological terminology, prospects for future morphological character discovery, phylogenetic analysis of morphological character data, the current status of weevil molecular phylogenetics and evolution, resources available for phylogenetic and comparative genomic studies of weevils, the weevil fossil record, weevil biogeography and evolution, weevil host plants, evolutionary development of the weevil rostrum, resources available for weevil identification and the current status of and challenges in weevil classification.

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Persistence and conservation of a consumer–resource metapopulation with local overexploitation of resources

Cited by 26 publications

References 46 publications

Testing the intermediate disturbance hypothesis: when will there be two peaks of diversity?

Testing the intermediate disturbance hypothesis: when will there be two peaks of diversity?

Local and regional dynamics of a specialist herbivore: overexploitation of a patchily distributed host plant

Morphological and Molecular Perspectives on the Phylogeny, Evolution, and Classification of Weevils (Coleoptera: Curculionoidea): Proceedings from the 2016 International Weevil Meeting

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