scholarly journals Shifts in fine‐scale distribution and breeding success of boreal waterbirds along gradients in ice‐out timing and habitat structure

2021 ◽  
Author(s):  
Hannu Pöysä ◽  
Antti Paasivaara
Keyword(s):  
Breeding Success ◽  
Habitat Structure ◽  
Fine Scale

Fine-scale habitat use by the southern emu-wren (Stipiturus malachurus)

2006 ◽  
Vol 33 (2) ◽  
pp. 137 ◽  
Author(s):  
Grainne S. Maguire
Keyword(s):  
Habitat Use ◽  
Plant Species ◽  
Habitat Structure ◽  
Canopy Cover ◽  
Ground Level ◽  
Fine Scale ◽  
Vegetation Height ◽  
Vertical Density ◽  
Foliage Density ◽  
Floristic Characteristics

Fine-scale variation in habitat structure and composition is likely to influence habitat use by avian species with limited flight capabilities. I investigated proportional use of available habitat and microhabitat by the southern emu-wren (Stipiturus malachurus), a threatened, flight-limited passerine, at three sites in Victoria, in relation to vegetation structure and composition. Emu-wrens appeared to discriminate between habitats with regard to structural rather than floristic characteristics. Habitats with dense vertical foliage of shrubs, grasses and sedges/rushes between ground level and 100 cm, and dense horizontal cover of medium to tall shrubs, were used most frequently. However, when availability of habitat was taken into account, habitat use was negatively correlated with the vertical density of low shrub foliage and species richness. Within habitats, emu-wrens more frequently used plant species that had a dense canopy cover (26 ± 2% of total cover, crown diameter 93 ± 5 cm), high foliage density between 50 and 100 cm, and average heights of ~1 m. Plant species in which the birds nested comprised ~14% of total canopy cover and were densest between ground level and 50 cm. Canopy cover, vegetation height and vertical foliage density were consistently important variables correlated with emu-wren habitat use at multiple fine-scales. This study provides valuable information for conservation management of the species; in particular, the restoration of degraded habitats.

Abundance, spatial distribution and habitat relationships of echinoderms in the Cabo Verde Archipelago (eastern Atlantic)

2008 ◽  
Vol 59 (6) ◽  
pp. 477 ◽  
Author(s):  
Laura Entrambasaguas ◽  
Ángel Pérez-Ruzafa ◽  
Jose A. García-Charton ◽  
Ben Stobart ◽  
Juan José Bacallado
Keyword(s):  
Spatial Variability ◽  
Habitat Structure ◽  
Sea Urchins ◽  
Spatial Scales ◽  
Benthic Communities ◽  
Fine Scale ◽  
Cabo Verde ◽  
Heterogeneous Habitats ◽  
Species Abundances ◽  
Species Specific

The analysis of spatial variability in distribution and abundance of echinoderms may help in identifying the range of processes that can explain the observed patterns of this important component of benthic communities. The distribution and abundance of the echinoderm assemblage inhabiting the shallow rocky reefs at the Cabo Verde archipelago (where few studies other than descriptive ones have been performed until now) was quantified at three spatial scales (among islands, between locations within islands, and among replicates), at two depth strata, and related to fine-scale variation of habitat structure. Total echinoderm abundance and the abundance of the sea urchins Diadema antillarum and Eucidaris tribuloides, and the holothurian Euapta lappa were heterogeneous at the largest considered scale. Most species and habitat descriptors exhibited spatial variability at finer scales. There were significant relationships between habitat architecture and depth and both assemblage parameters and species abundances. Although the effects of habitat structure were species-specific, the probability of occurrence of Asteroidea, Ophiuroidea and Holothuroidea species was higher in heterogeneous habitats. Meanwhile Echinoidea and Holothuroidea species showed higher correlations to complex habitats. The observed spatial patterns are inferred to reflect behavioural responses to fine-scale microhabitat complexity, as well as broad-scale oceanic variables and recruitment dynamics.

Influence of fine-scale habitat structure on nest-site occupancy, laying date and clutch size in Blue Tits Cyanistes caeruleus

2016 ◽  
Vol 70 ◽  
pp. 37-44 ◽  
Author(s):  
Seyed Mehdi Amininasab ◽  
Oscar Vedder ◽  
Elske Schut ◽  
Berber de Jong ◽  
Michael J.L. Magrath ◽  
...  
Keyword(s):  
Clutch Size ◽  
Habitat Structure ◽  
Nest Site ◽  
Site Occupancy ◽  
Laying Date ◽  
Fine Scale ◽  
Cyanistes Caeruleus ◽  
Blue Tits

Fine-scale habitat structure complexity determines insectivorous bird diversity in a tropical forest

2014 ◽  
Vol 61 ◽  
pp. 19-23 ◽  
Author(s):  
Gabriel J. Castaño-Villa ◽  
Santiago A. Ramos-Valencia ◽  
Francisco E. Fontúrbel
Keyword(s):  
Tropical Forest ◽  
Habitat Structure ◽  
Bird Diversity ◽  
Fine Scale ◽  
Insectivorous Bird ◽  
Structure Complexity

scholarly journals Habitat structure modifies microclimate: An approach for mapping fine‐scale thermal refuge

2018 ◽  
Vol 9 (6) ◽  
pp. 1648-1657 ◽  
Author(s):  
Charlotte R. Milling ◽  
Janet L. Rachlow ◽  
Peter J. Olsoy ◽  
Mark A. Chappell ◽  
Timothy R. Johnson ◽  
...  
Keyword(s):  
Habitat Structure ◽  
Fine Scale ◽  
Thermal Refuge

High Resolution Stereography of Complementary Freeze-Fracture Replicas Reveals the Presence of Depressions Opposite Membrane Associated Particles of Split Membranes

1971 ◽  
Vol 29 ◽  
pp. 442-443
Author(s):  
Russell L. Steere
Keyword(s):  
High Resolution ◽  
Cardiac Muscle ◽  
Electron Micrographs ◽  
Chromic Acid ◽  
Freeze Fracture ◽  
Distilled Water ◽  
Fine Scale ◽  
Acid Cleaning ◽  
Cleaning Solution

Complementary replicas have revealed the fact that the two common faces observed in electron micrographs of freeze-fracture and freeze-etch specimens are complementary to each other and are thus the new faces of a split membrane rather than the original inner and outer surfaces (1, 2 and personal observations). The big question raised by published electron micrographs is why do we not see depressions in the complementary face opposite membrane-associated particles? Reports have appeared indicating that some depressions do appear but complementarity on such a fine scale has yet to be shown.Dog cardiac muscle was perfused with glutaraldehyde, washed in distilled water, then transferred to 30% glycerol (material furnished by Dr. Joaquim Sommer, Duke Univ., and VA Hospital, Durham, N.C.). Small strips were freeze-fractured in a Denton Vacuum DFE-2 Freeze-Etch Unit with complementary replica tooling. Replicas were cleaned in chromic acid cleaning solution, then washed in 4 changes of distilled water and mounted on opposite sides of the center wire of a Formvar-coated grid.

Climate change and breeding success: decline of the capercaillie in Scotland

2001 ◽  
Vol 70 (1) ◽  
pp. 47-61 ◽  
Author(s):  
Robert Moss ◽  
James Oswald ◽  
David Baines
Keyword(s):  
Climate Change ◽  
Breeding Success
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