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Law, Bradley; Dickman, Chris R.

doi:10.1023/a:1008877611726

Cited by 257 publications

(31 citation statements)

References 66 publications

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“…This is in accordance with other studies showing that bats explore different patches within a landscape and that fragmented, mosaic-shaped landscapes can still harbour several bat species (Law and Dickman 1998;Fenton 2002, 2007). On the other hand, it might also suggest the presence of one assemblage making use of several distinct habitat patches.…”

Section: Bat Assembly Structuring Across Habitats and Seasonssupporting

confidence: 93%

“…This seems to be particularly true when landscapes are characterized by a mosaic of habitats, allowing bats to explore different sites and to become less dependent on a particular setting (Fenton 1997). However, habitat mosaics may favour the conditions necessary to allow co-occurring species to feed in different habitats (Law and Dickman 1998) and to exhibit distinct patterns of resource exploitation, even when they are morphologically similar (e.g. Pipistrellus pipistrellus and Pipistrellus pygmaeus, Davidson-Watts et al 2006).…”

Section: Introductionmentioning

confidence: 99%

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A mosaic of opportunities? Spatio-temporal patterns of bat diversity and activity in a strongly humanized Mediterranean wetland

et al. 2014

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The Baixo Vouga Lagunar (BVL) landscape, in the Portuguese central-west coast, harbours a mosaic of wetland habitat types, interspersed by intensive and extensive agricultural fields, pastures, production forests and urban areas. In this study, we aimed to determine the species composition and the structure of the bat assemblages of the different habitats that constitute this heterogeneous landscape and to investigate seasonal changes in the patterns of bat diversity and activity across habitats. We acoustically sampled bats across 24 sampling sites representative of the eight main habitat types that shape the landscape-Bocage, forests, maize fields, marshlands, reed beds, rice fields, sea rushes and urban settlements. We compared bat richness, diversity and evenness across habitat types and seasons. We analysed habitat-specific and season-specific overall bat activity, and because habitat selection by bats is known to reflect morphological characters, foraging strategies and echolocation call structures, we also analysed the activity of individual species and of ecomorphological guilds. From 1,544 bat-passes recorded, we identified 12 species. Pipistrellus pygmaeus, Pipistrellus pipistrellus and Eptesicus serotinus/Eptesicus isabellinus were the most frequently recorded. Species composition and activity were similar across habitats, whilst exhibiting strong seasonal dynamics within habitats. Our results suggest that the mosaicism of the landscape provides several opportunities for bats, enabling them to explore different resources in distinct habitat patches. However, it may also reflect a forced exploitation of less optimal habitats and resources by bats, due to the scarcity of opportunities provided by fragmented landscapes.

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Section: Bat Assembly Structuring Across Habitats and Seasonssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

A mosaic of opportunities? Spatio-temporal patterns of bat diversity and activity in a strongly humanized Mediterranean wetland

et al. 2014

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“…Mosaic landscape is more effective for bird diversity conservation since many species were abundantly registered in all habitats, which can be an evidence of flexibility on habitat use (Law andDickman 1998, Smith et al, 2011;Figueira et al, 2006). Further, the existing heterogeneity in aquatic habitats also creates favorable conditions for the establishment of aquatic birds with different ecological characteristics, resulting in high beta diversity (Moreno and Halffter 2001, Balvanera et al, 2002, Veech, 2005.…”

Section: Discussionmentioning

confidence: 99%

Distribution, composition and seasonality of aquatic birds in the Nhecolândia sub-region of South Pantanal, Brazil

2014

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Despite remarkable significance of Pantanal for the conservation of aquatic birds, the status of their populations, the spatiotemporal patterns of distribution and habitat use and structure of communities are little known. Thus, we studied three aquatic environments (Negro river, bays and salines) from 2007 to 2009 in the Nhecolândia Pantanal to verify the distribution and composition of aquatic birds and also if there is significant seasonal influence on these aspects. We adopted the transect method (288 hours of sampling) and recorded 135 species (7.834 individuals). The Negro river showed the highest diversity, while the salines the lowest. The similarity of aquatic bird communities was higher between bays and salines, followed by Negro river and bays and lower between salines and Negro river. The equidistribution is more variable in the salines and more stable in the Negro river. The environments strongly differ from each other in aquatic bird composition in space (habitat use and distribution) and time (seasonal water fluctuations). The diversity of bird community in the dry season varies significantly in the salines, followed by the bays and more stable in the Negro river. The Negro river, regardless of large annual amplitude of flow, is more seasonally stable since its riparian vegetation is continuous (not isolated) and constant. These aspects provide better conditions to stay all year, contributing to decrease the seasonal nomadic tendencies of aquatic birds. Finally, all these data provide strong arguments to the preservation of all phytophysiognomies in the Nhecolândia sub-region of Pantanal, but with special attention to the salines widely used by many flocks of aquatic birds (mainly in the dry season) and migrant and/or rare species restricted to this habitat. Isto se deve principalmente pela mata ciliar no rio Negro ser contínua (não isolada) e constante ao longo do ano. Estes aspectos proporcionam melhores condições para as aves se manterem durante todo o ano neste ambiente, contribuindo para diminuir as tendências sazonais nômades de aves aquáticas. Todos estes dados fornecem fortes argumentos para o preservação de todos as fitofisionomias na sub-região da Nhecolândia, mas com especial a atenção para as salinas amplamente utilizadas por muitos bandos de aves aquáticas (principalmente no período seco) e migrantes e/ou espécies raras restritas a este habitat. KeywordsPalavras-chave: heterogeneidade, conservação, dinâmica, aves aquáticas, Pantanal.

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“…Yet, the varied patterns of habitat use by multiple species that we identified emphasise the value of heterogeneous landscapes. In particular, heterogeneity should include a mosaic of thinned areas, but also recognize the value of dense unthinned patches, both to fulfil the requirements of different species [71,72], and to allow for different aspects of a species' ecology (roosting vs. foraging areas; [73]). The thinned patches in our study (12 ha) were of sufficient size to result in increased flight activity, but the size of unthinned patches required for roosting remains poorly known, though N. corbeni roosts in alleys of unthinned regrowth adjacent to thinned strips [28].…”

Section: Management Implicationsmentioning

confidence: 99%

Does Thinning Homogenous and Dense Regrowth Benefit Bats? Radio-Tracking, Ultrasonic Detection and Trapping

et al. 2018

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Abstract:Renewal ecology promotes the creation and enhancement of landscapes that support biodiversity and ecosystem services for humans. Silvicultural thinning of forest regrowth to reduce tree competition represents a form of active management that may also benefit biodiversity, especially where secondary regrowth dominates. However, ecological responses to thinning can be complex, particularly for insectivorous bats whose ecomorphology is often related to vegetation structure. Furthermore, thinning may affect multiple aspects of bat ecology (i.e., roosting and foraging). We assessed this in dense white cypress regrowth in the Pilliga forests of New South Wales, Australia, where recent experimental thinning created thinned stands (4 × 12 ha) surrounded by unthinned regrowth. We contrasted flight activity and roost selection of three narrow-space species with differing conservation statuses (Nyctophilus corbeni, N. gouldi and N. geoffroyi), plus one edge-space species (Vespadelus vulturnus). Radio-tracking over two maternity seasons revealed a preference by all species for roosting in dead trees that were slightly larger than the mean for available dead trees in the vicinity. Although all tagged bats were caught in thinned patches, only 6% of roosts were located there. In contrast, ultrasonic detectors recorded significantly greater activity for V. vulturnus (p = 0.05) in thinned than unthinned patches and no treatment difference for Nyctophilus spp. Systematic trapping using acoustic lures found a higher trap rate for N. gouldi in unthinned than thinned treatments, but no treatment effect for N. corbeni, N. geoffroyi and V. vulturnus. Our results reveal differential use of forest treatments by multiple species, emphasising the value of heterogeneous landscapes supporting thinned and unthinned patches of dense regrowth.

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Cited by 257 publications

References 66 publications

A mosaic of opportunities? Spatio-temporal patterns of bat diversity and activity in a strongly humanized Mediterranean wetland

A mosaic of opportunities? Spatio-temporal patterns of bat diversity and activity in a strongly humanized Mediterranean wetland

Distribution, composition and seasonality of aquatic birds in the Nhecolândia sub-region of South Pantanal, Brazil

Does Thinning Homogenous and Dense Regrowth Benefit Bats? Radio-Tracking, Ultrasonic Detection and Trapping

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