Effects of dry grassland management on spider (Arachnida: Araneae) communities on the Swiss occidental plateau

Pozzi, S.; Borcard, Daniel

doi:10.1080/11956860.2001.11682628

Cited by 15 publications

(13 citation statements)

References 22 publications

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“…These percentages seem low considering that this coastal ecosystem has clear spatial and seasonal patterns (Ramos Miranda et al, 2005a). However, these results are similar to those obtained in other studies that used the same methodology (Pozzi and Borcard, 2001). The two main factors responsible for part of this total undetermined variation are the stochastic fluctuations in species assemblages and the lack of certain environmental variables able to add explanatory power to the analyses.…”

Section: Discussionsupporting

confidence: 85%

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How much variation can be explained by seasonal, spatial and environmental effects in nekton assemblages of the Terminos Lagoon?

Ramos-Miranda

Mouillot

Sosa-López

et al. 2007

Aquatic Conservation

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ABSTRACT1. The coastline is very sensitive to both climatic and human influences but also provides essential goods and services upon which human welfare depends. Species inhabiting these coastal areas provide valuable resources and enhance ecosystem functioning: it is therefore essential to understand the main factors influencing species abundance patterns. The aim of this study is to estimate the amount of variation in nekton coastal assemblages explained by spatial, temporal and environmental variables.2. Nekton sampling was carried out over 17 months in the Terminos Lagoon, a reserve area situated in the Gulf of Mexico, using a shrimp trawl. At each station, 11 environmental variables were recorded. The influence of seasonal, spatial and environmental variables on nekton species abundance was analysed using Partial Canonical Correspondence Analysis (PCCA).3. The explanatory variables explained only 19.7% of the total observed variation in the nekton community for the Terminos Lagoon. The major part of the explained variation was due to the spatial effect (9.2%), while environmental variables and seasonality explained only 3.6% and 0.8%, respectively, suggesting the necessity to consider experimental fishing design in such artisanal fisheries.4. Results also suggest focusing on more integrative indicators of community structure such as measures of taxonomic diversity based on presence/absence or on measures related to functional attributes of communities rather than using species abundance patterns to predict changes in coastal ecosystems.

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Section: Discussionsupporting

confidence: 85%

“…In order to retain only the significant variables, each explanatory matrix was tested using a forward selection procedure on the species matrix using a Monte Carlo test with 5000 permutations (Anderson and Gribble, 1998;Pozzi and Borcard, 2001 (Table 1). For the combined effects, i.e.…”

Section: Data Processingmentioning

confidence: 99%

How much variation can be explained by seasonal, spatial and environmental effects in nekton assemblages of the Terminos Lagoon?

Ramos-Miranda

Mouillot

Sosa-López

et al. 2007

Aquatic Conservation

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“…Contrary to several previous studies on other large herbivores (e.g., Pozzi and Borcard, 2001;Pétillon et al, 2007), no significant effect of grazing was found on spider species richness. Indeed, as for many other taxa, and as with many other disturbances, grazing by large herbivores is usually reported to be negative on spiders (Bell et al, 2001; see also the meta-analysis of Prieto-Benítez and Méndez, 2011).…”

Section: Structural Diversitycontrasting

confidence: 99%

Short–term effects of horse grazing on spider assemblages of a dry meadow (Western France)

Pétillon¹,

François²,

Lafage³

2018

Anim. Biodiv. Conserv.

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Short-term effects of horse grazing on spider assemblages of a dry meadow (Western France). In this study, the biodiversity impacts of a little studied herbivore, the horse, were assessed in a high conservation value habitat of dry meadows in Brittany (Western France). Spiders, a diversified and abundant group of predators, were used as bioindicators. Three complementary sampling techniques were used to assess changes in spider assemblages in both soil and vegetation strata, over time (diachronic comparison of managed unit before vs. after management) and space (synchronic comparison of managed vs. control units). Few effects of grazing, i.e. only one significantly indicative species, were found on assemblage composition (ANOSIM), and none on abundances, α-and β-diversities (GLM on pitfall trap data). On the contrary, important differences were found between units before management took place. The main effects of grazing management were revealed over time (after one year), and not between managed and control units (CCA on pitfall trap data and x²-tests on guilds from each sampling method), showing the relevance of a diachronic approach more than a synchronic approach in such management monitoring. Grazing by horses could be relevant to manage meadows because it creates a high spatial heterogeneity, but further (long-term) studies including other model groups are required.

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“…The same families are sensitive to mowing in other wetlands (Cattin et al 2003;, and indicate low levels of disturbance in agricultural habitats (Bell et al 2001;Schmidt and Tscharntke 2005). Mowing can be detrimental to spiders and insects also in mesic and dry grasslands (Pozzi and Borcard 2001;Stoner and Joern 2004;Thorbek and Bilde 2004). In particular, mowing reduces the vegetation structure needed by aerial web builders (e.g.…”

Section: Discussionmentioning

confidence: 98%

Rotational fallows as overwintering habitat for grassland arthropods: the case of spiders in fen meadows

et al. 2008

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Regular mowing of grassland is often necessary for plant conservation, but uncut vegetation is needed by many arthropods for overwintering. This may lead to conXicting management strategies for plant and arthropod conservation. Rotational fallows are a possible solution. They provide a spatio-temporal mosaic of mown and unmown areas that may combine beneWts to both plants and arthropods. We tested if rotational fallows enhance spider overwintering in fen meadows. Rotational fallows consisted of three adjoining strips 10 m wide and 35-50 m long. Each year, one of these strips was left unmown (fallow) in an alternating manner so that each strip was mown two out of three years. Spiders were sampled during spring with emergence traps in nine pairs of currently unmown fallow strips and completely mown reference plots. Fallows signiWcantly enhanced orb-weavers (Araneidae), sac spiders (Clubionidae) and ground spiders (Gnaphosidae). However, only 4.7% of the total variation in community composition was attributable to fallows. Community variation was larger between landscapes (34.5%) and sites (38.2%). Also diversity was much higher between landscapes (45 species) and sites (22 species) than between fallows and mown reference plots (10 species). We conclude that the Wrst priority for spider conservation is to preserve as many fen meadows in diVerent landscapes as possible. Locally, rotational fallows enhance overwintering of the above-mentioned spider families, which are sensitive to mowing in other grassland types as well. Thus, rotational fallows would probably foster spider conservation in a wide range of situations. However, stronger eVects can be expected from larger and/or older fallow areas.

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Effects of dry grassland management on spider (Arachnida: Araneae) communities on the Swiss occidental plateau

Cited by 15 publications

References 22 publications

How much variation can be explained by seasonal, spatial and environmental effects in nekton assemblages of the Terminos Lagoon?

How much variation can be explained by seasonal, spatial and environmental effects in nekton assemblages of the Terminos Lagoon?

Short–term effects of horse grazing on spider assemblages of a dry meadow (Western France)

Rotational fallows as overwintering habitat for grassland arthropods: the case of spiders in fen meadows

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