Invertebrate numbers in edges between clearfellings and mature forests in Northern Finland.

Helle, Pekka; Muona, Jyrki

doi:10.14214/sf.a15424

Cited by 91 publications

(54 citation statements)

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“…Our results, similar to previous studies analysing edge effect on other taxa of invertebrates, revealed that there was a significant edge effect on the studied phytophagous and predator invertebrate groups (Heublein 1983, Helle and Muona 1985, Duelli et al 1990, Bedford and Usher 1994, Magura and Tóthmérész 1997. There were no publications demonstrating the edge effect for these two particular taxa.…”

Section: Discussionsupporting

confidence: 92%

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Edge effect on weevils and spiders

Horváth

Magura

Péter³

et al. 2002

Web Ecol.

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The edge effect on weevils and spiders was tested along oak forest – meadow transects using sweep-net samples at the Síkfökút Project in Hungary. For spiders the species richness was significantly higher in the forest edge than either in the meadow or the forest interior. For weevils the species richness of the forest edge was higher than that of the meadow, but the difference was not statistically significant whereas the species richness of the forest interior was significantly lower than that of the forest edge and the meadow. The composition of the spider assemblage of the edge was more similar to the forest, while the composition of weevils in the edge was more similar to the meadow. Our results based on two invertebrate groups operating on different trophic levels suggest that there is a significant edge effect for the studied taxa resulting in higher species richness in the edge

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Section: Discussionsupporting

confidence: 92%

“…There are just a few published studies that include more than one trophic level (e.g. Helle and Muona 1985). Species from different trophic levels may have diverse behaviours in response to environmental conditions.…”

mentioning

confidence: 99%

Edge effect on weevils and spiders

Horváth

Magura

Péter³

et al. 2002

Web Ecol.

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“…Forest edges harbour a rich invertebrate fauna (e.g. Helle andMuona 1985, Jokimäki et al 1998), but very few of these species appear to be edge specialists (Didham 1997a, b).…”

Section: Aims Of the Studymentioning

confidence: 99%

Boreal carabid beetles (Coleoptera, Carabidae) in managed spruce forests – a summary of Finnish case studies

Koivula¹,

Niemelä²

2002

Silva Fenn.

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“…prey abundance or weight per unit area) than large patches (Burke & Nol 1998;Zanette et al 2000). However, this idea runs counter to many invertebrate studies that find mixed results of landscape structure on invertebrate abundance and richness with taxonomic groups showing idiosyncratic responses to habitat loss and fragmentation (Helle & Muona 1985;Van Wilgenburg et al 2001;Laurance et al 2011;Moreno et al 2013). In reality, few studies have directly measured prey availability for avian insectivores and results have been mixed with prey showing either negative relationships (Burke & Nol 1998;Zanette et al 2000;Luck 2003;Morrison et al 2010) or no relationship (Şekercioğlu et al 2002;Butcher et al 2010) to measures of habitat loss or fragmentation.…”

Section: Effects Of Limited Resource Availability In Highly-modified mentioning

confidence: 91%

“…Substantial work has been invested in identifying how invertebrate populations respond to edge habitat (Helle & Muona 1985;Major et al 2003;Ewers 2008). Given that more-fragmented landscapes contain more edge habitat (Forman & Godron 1986) and microclimate conditions are more desiccating within edge habitat than core habitat (Didham 1997;Laurance et al 2011), prey availability could be lower at habitat edges.…”

Section: Limitations Of the Study And Suggested Future Researchmentioning

confidence: 99%

Why are woodland-dependent avian insectivore populations vulnerable to declines in highly-modified landscapes?

Cosgrove¹

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Habitat loss, fragmentation, and degradation are the leading causes of faunal population declines.Substantial effort has been invested in identifying how these landscape changes are related to population parameters. However, to effectively mitigate declines, we must understand the underlying mechanisms impacted by landscape change. Woodland-dependent avian insectivores seem particularly vulnerable, and decline at rates disproportionately greater than other foraging guilds. This pattern suggests that reduced food availability in less-wooded landscapes may be a contributing factor. However, the evidence supporting this hypothesis is sparse. I adopted a multidisciplinary approach to investigate the mechanisms driving population changes of an avian insectivore in highly-modified landscapes by integrating physiological indices with measures of prey availability and landscape structure. First, I presented a framework for conceptualising how the spatiotemporal scale of fragmentation influences the mechanisms impacting populations. I then used the eastern yellow robin (Eopsaltria australis) in the Brigalow Belt South bioregion of southern Queensland to test the importance of local and landscape factors on robin site occupancy, prey density, and robin condition. I also investigated whether an index of chronic stress could be used to predict changes to robin occurrence and identify potential threats to the population. I concluded this work by conducting a supplementary feeding experiment to determine whether food availability was causing the variation in robin condition. A pilot study conducted in the study region four years earlier found that robins were more physiologically stressed (had higher heterophil:lymphocyte ratios) in sites with less woodland in the surrounding landscape, but site occupancy was unrelated to woodland cover. Re-examining the same study system, I established that woodland cover was now the strongest predictor of iii occupancy. While woodland cover at a local scale (within 500 m) was important for robin persistence, woodland cover at a broader scale relevant to dispersal movements (within 5 km) was not. While my stress index could not accurately predict the precise locations of future extirpations, patterns of stress indices (birds were more stressed where woodland cover was lower) did foreshadow a change to the pattern of occurrence. Extirpations from sites with low levels of woodland cover were balanced by colonisations of more-wooded sites. Surprisingly, I found that arthropod prey density was greater at sites that had less surrounding woodland. This result was primarily driven by a large number of Formicidae (ants). However, Formicidae have low nutritional value and once they were excluded from the results, soil moisture, not woodland cover, became the primary determinant of arthropod density. I predicted that robin condition would be strongly associated with arthropod density, but this was not the case. Instead, robins had elevated stress levels at sites with apparently more-favourable...

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Invertebrate numbers in edges between clearfellings and mature forests in Northern Finland.

Cited by 91 publications

References 0 publications

Edge effect on weevils and spiders

Edge effect on weevils and spiders

Boreal carabid beetles (Coleoptera, Carabidae) in managed spruce forests – a summary of Finnish case studies

Why are woodland-dependent avian insectivore populations vulnerable to declines in highly-modified landscapes?

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