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1

Factors affecting temporal dynamics of avian assemblages in a heterogeneous landscape

100%
Tworek S.
Acta Ornithologica
|
2004
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tom 39
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nr 2
The influence of the characteristics of habitat fragments on the dynamics of avian communities and the effect that fragments of different sizes have on the stability of the breeding species composition, and also on local extinction, colonisation and turnover rates were studied in an agricultural landscape in southern Poland. The fragments included various habitat types that differed from the matrix. Breeding birds were surveyed using the territory mapping method to assess turnover. Species composition depended on both the spatial structure of a fragment and the features of its surroundings. Local declines and appearances of species had a similar influence on the turnover in all size classes of the fragments. Species that contributed most to the total turnover were: Lanius collurio, Phasianus colchicus, Anas platyrhynchos, Emberiza schoeniclus, Columba palumbus and Sylvia communis. However, there were differences among species contributing most to the turnover according to area size classes. Heterogeneous habitats in a mosaic-like, agricultural landscape do not function as islands. The existence of species in an area with such a level of habitat patchiness can be related primarily to habitat quality, mainly because of poor isolation and the high permeability of isolating habitats.
2

Influence of branch death on leaf nutrient status and stoichiometry of wild apple trees (Malus sieversii) in the Western Tianshan Mountains, China

100%
Tao Y., Nuerhailati M., Zhang Y.-M., Zhang J., Yin B.-F., Zhou X.-B.
Polish Journal of Ecology
|
2020
|
tom 68
|
nr 4
3
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Field study of film spreading on a sea surface

100%
Korinenko A. E., Malinovsky V. V.
Oceanologia
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2014
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tom 56
|
nr 3
4

Geoinformatics for biodiversity assessment

100%
Murthy M. S. R., Giriraj A., Dutt C. B. S.
Biological Letters
|
2003
|
tom 40
|
nr 2
5
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Temporal dynamics of the geographic differentiation of Late Devonian Palmatolepis assemblages in the Prototethys

80%
Girard C., Ta H. P., Savage N., Renaud S.
Acta Palaeontologica Polonica
|
2010
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tom 55
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nr 4
Throughout their history, species had to face environmental variations spatially and temporally. How both levels of variation interact will be of key importance in conditioning their response to major perturbations. We addressed this question by focusing on a period in Earth’s history marked by dramatic environmental and faunal changes, the Late Devonian Frasnian/Famennian boundary. From a paleogeographic point of view, this period is characterized by a cosmopolitanism of the faunas across a large ocean, the Prototethys. We considered the biotic reaction at a seldom considered scale, namely within a single subgenus of conodont, Palmatolepis (Manticolepis). Patterns of spatial and temporal differentiation were quantified using morphometrics of its platform element. The recognized cosmopolitanism of the faunas was confirmed at this scale of variation since temporal records gathered in distant areas around the Prototethys, including the seldom documented regions located nowadays in South−East Asia, displayed similar morphological trends in response to the major F/F crisis. Beyond this overall cosmopolitanism, subtle geographic structure was evidenced but was not stable through time. Geographic differentiation was maximal shortly before the F/F crisis, suggesting that despite high sea−level, tectonics leaded to complex submarine landscapes promoting differentiation. In contrast any geographic structure was swamped out after the crisis, possibly due to a global recolonization from few favorable patches.
6

Factors influencing perceived community structure in nearctic forest small mammals

70%
Kirkland G. L., Sheppard P. K., Shaughnessy M. J., Woleslagle B. A.
Acta Theriologica
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1998
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tom 43
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nr 2
Arrays of pitfalls and drift fences were deployed in five deciduous forest habitats in southcentral Pennsylvania to assess the characteristics, and temporal and spatial dynamics of forest small-mammal communities, and to determine the impact of precipi­tation, sampling method, and length of sampling period on perceived small-mammal abundance and community structure. Results revealed that soricid assemblages were more diverse and generally more abundant than rodent assemblages, which were dominated by the white-footed mouse Peromyscus leucopus. Precipitation dramatically increased the capture rates of shrews; the response was less pronounced in rodents. Individual species responded independently to precipitation. The response was more pronounced in three species of arvicoline rodents (Clethrionomys gapperi, Microtus pinetorum, and M. pennsylvanicus) than in P. leucopus, a sigmodontine. Comparisons of sampling with pitfalls and Museum Special snap-traps, with and without drift fencing, revealed that arrays of pitfalls with drift fences produced significantly higher capture rates for all small mammals, shrews, rodents, and P. leucopus, greater num­bers of species, and higher Shannon indices than other sampling methods, Comparison of the results of sampling for 3, 5, 7, and 10 days revealed that extending sampling to 7 or more days yielded significantly more species, higher Shannon indices, and greater numbers of individuals than sampling for less than 7 days.
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