Donnerstag, 14 Juni 2018 17:24

REINER, E. & LÖFFLER, E. (Hrsg. 1977)

Australien.

224 Seiten mit einigen Karten und 138 teils ganzseitigen farbigen Fotos auf Kunstdrucktafeln, farbige Karte auf den Vorsätzen.
Kümmerly & Frey, Geographischer Verlag, Bern. ISBN 3-259-08471-1.

Freigegeben in R
Donnerstag, 14 Juni 2018 17:16

REIMOSER, S. & REIMOSER, F. (2006)

Lebensraum und Abschuss, Abschussdichten verschiedener Wildarten in den österreichischen Bezirken seit 1955.
14.Teil: Murmeltier, Alpenschneehuhn, Steinhuhn.

Weidwerk 2006 Nr. 7: 8-9.

Einleitung:

Das Jubiläum „50 Jahre Staatsvertrag“ im vergangenen Jahr war Anlass für einen jagdlichen Rückblick auf die Veränderung der Abschüsse in Österreich in Abhängigkeit von Lebensraumtyp und Wildart. Diese mehrteilige WEIDWERK-Serie bietet einen Überblick über die oft interessanten Veränderungen während der letzten 50 Jahre, der Leser kann seinen Bezirk mit anderen vergleichen.

 

reimoser-biblio

Freigegeben in R
Donnerstag, 14 Juni 2018 17:15

REIMOSER, S. & REIMOSER, F. (2006)

Lebensraum und Abschuss, Abschussdichten verschiedener Wildarten in den österreichischen Bezirken seit 1955.
11.Teil: Auerwild, Birkwild und Haselwild.

Weidwerk 2006 Nr. 4: 8-11.

Einleitung:

Das Jubiläum „50 Jahre Staatsvertrag“ im vergangenen Jahr war Anlass für einen jagdlichen Rückblick auf die Veränderung der Abschüsse in Österreich in Abhängigkeit von Lebensraumtyp und Wildart. Diese mehrteilige WEIDWERK-Serie bietet einen Überblick über die oft interessanten Veränderungen während der letzten 50 Jahre, der Leser kann seinen Bezirk mit anderen vergleichen.

 

reimoser-biblio

Freigegeben in R

Species diversity of the Okavango Delta, Botswana.

Aquat. Sci. 68 (2006) 310–337. ISSN 1015-1621/06/030310-28. DOI 10.1007/s00027-006-0857-y © Eawag, Dübendorf, 2006

Abstract:

In the Okavango Delta (about 28,000km2) the number of identified species is 1,300 for plants, 71 for fish, 33 for amphibians, 64 for reptiles, 444 for birds, and 122 for mammals. The local occurrence of different species of these taxonomic groups in the Okavango Delta is mainly due to a hydrological gradient from permanent streams and swamps to seasonal floodplains, riparian woodlands, and dry woodlands. This level of species diversity is normal for the southern African region, and all analyzed aquatic groups are composed of ubiquitous species with an additional significant proportion of species originating from northern, more tropical systems. Cyclical variations in climate over thousands of years have created a huge wetland complex in the upper Zambezi and Okavango Rivers during wet phases. This wetland complex has fragmented into the Okavango Delta and other large wetlands in Zambia during dry phases. There are no endemic species in the Okavango Delta while the South-central African wetland complex is a centre of endemism. Species diversity of the Okavango Delta is a consequence of this unique environment, with dynamic shifts in flooding patterns that in turn force constant changes in patterns of plant succession and dependent animals. Temporal variations in flooding also cause accumulation and sudden mobilization of nutrients which are readily used by well adapted plant species. As a consequence, locally high biological productivity occurs, which in turn results in high numbers of grazing mammals.

Species diversity of the Okavango Delta, Botswana (PDF Download Available). Available from: https://www.researchgate.net/publication/226358917_Species_diversity_of_the_Okavango_Delta_Botswana [accessed Nov 14 2017].

Freigegeben in R
Donnerstag, 14 Juni 2018 16:59

RAJKARAN, A. (2011)

A status assessment of mangrove forests in South Africa and the utilization of mangroves at Mngazana Estuary.

Phil. II Diss. Nelson Mandela Universität, Port Elizabeth.

Abstract:

In South Africa mangrove forests are located in estuaries from Kosi Bay in KwaZulu-Natal (KZN) to Nahoon Estuary in the Eastern Cape. The aims of this study were to determine the present state of mangroves in KwaZulu-Natal, by assessing the current population structure, the changes in cover over time and associated anthropogenic pressures. A second objective of this study was to determine the effect of harvesting on the population structure and sediment characteristics in the Mngazana mangrove forest. To determine if harvesting was sustainable at Mngazana Estuary; the growth and mortality rates and associated growth conditions were measured. Finally by using population modelling sustainable harvesting limits were determined by predicting the change in population structure over time. The study focussed on the KwaZulu-Natal province as a fairly recent study addressed mangrove distribution and status in the Eastern Cape Province. A historical assessment of all mangroves forests in KwaZulu-Natal (KZN) revealed that the potential threats to mangroves in South Africa include; wood harvesting, altered water flow patterns coupled with salinity changes, prolonged closed-mouth conditions and subsequent changes to the intertidal habitat. As a result mangroves were completely lost from eleven estuaries in KZN between 1982 and 1999 and a further two estuaries by 2006. Mangroves only occurred in those estuaries where the mouth was open for more than 56 percent of the time with the exception of St Lucia, where the mouth has been closed for longer but the mangrove communities have persisted because the roots of the trees were not submerged. All mangrove forests in KZN were regenerating in terms of population structure as they had reverse J-shaped population curves as well as high adult: seedling ratios. Kosi Bay and Mhlathuze Estuary were two of the larger forests that showed signs of harvesting (presence of tree or branch stumps), but the greatest threat to smaller estuaries seems to be altered water flow patterns due to freshwater abstraction in the catchments and the change of land use from natural vegetation to sugar-cane plantations. These threats affect the hydrology of estuaries and the sediment characteristics (particle size, redox, pH, salinity, temperature) of the mangrove forests. The environmental conditions under which the mangrove forests currently exist were determined for five species. Lumnitzera racemosa and Ceriops tagal exhibited a narrow range of conditions as these species are only found at Kosi Bay, while Avicennia marina, Bruguiera gymnorrhiza and Rhizophora mucronata were found to exist under a wider range of conditions. The growth rate and response to environmental conditions of the three dominant species were important to determine as these species are impacted by harvesting. Mangrove growth rates were measured at Mngazana Estuary in the Eastern Cape, the third largest mangrove forest in South Africa. Areas of this estuary where mangroves harvesting has occurred, show significant differences in sediment characteristics as well as changes in population structure in harvested compared to non harvested sites. The growth rate (in terms of height) of Avicennia marina individuals increased from seedlings (0.31 cm month-1) to adults (1.2 cm month-1), while the growth of Bruguiera gymnorrhiza stabilised from a height of 150 cm at 0.65 cm month-1. The growth of Rhizophora mucronata peaked at 0.72 cm month-1 (height 151-250 cm) and then decreased to 0.4 cm month-1 for taller individuals. Increases in diameter at breast height (DBH) ranged between 0.7 and 2.3 mm month-1 for all species. Some environmental variables were found to be important drivers of growth and mortality of individuals less then 150 cm. A decrease in sediment pH significantly increased the mortality of Avicennia marina seedlings (0-50 cm) (r = - 0.71, p<0.05) and significantly decreased the growth of Rhizophora mucronata and Bruguiera gymnorrhiza seedlings (r = -0.8, r = 0.52 – p < 0.05 respectively). At Mngazana Estuary, mortality of this species showed a positive correlation with sediment moisture content indicating that this species prefers drier conditions. The density of Rhizophora mucronata was significantly correlated to porewater temperature in Northern KZN as was the growth of adult (>300 cm) Rhizophora trees at Mngazana Estuary. Mortality of Avicennia marina individuals (51-150 cm) was related to tree density indicating intraspecific competition and self thinning. Selective harvesting of particular size classes of Rhizophora mucronata was recorded when comparing length of harvested poles (~301 cm) and the size class distribution of individuals. Taking into account the differences in growth rate for each size class for this species it will take approximately 13 years to attain a height of 390 cm which is the height at which trees are selected for harvesting at this estuary. This is 2.6 times slower than those individuals growing in Kenya. The feasibility of harvesting is dependent on the growth rate of younger size classes to replace harvested trees as well as the rate of natural recruitment feeding into the population. Different harvesting intensity scenarios tested within a matrix model framework showed that limits should be set at 5 percent trees ha-1 year-1 to maintain seedling density at > 5 000 ha-1 for R. mucronata. However harvesting of Bruguiera gymnorrhiza should be stopped due to the low density of this species at Mngazana Estuary. Harvesting of the tallest trees of Avicennia marina can be maintained at levels less than 10 percent ha-1 year-1. Effective management of mangrove forests in South African is important to maintain the current state, function and diversity of these ecosystems. Management recommendations should begin with determining the freshwater requirements of the estuaries to maintain the mouth dynamics and biotic communities and deter the harvesting of (whole) adult trees particularly those species that do not coppice. Further management is needed to ensure that forests are cleared of pollutants (plastic and industrial), and any further developments near the mangroves should be minimized.

Freigegeben in R
Donnerstag, 14 Juni 2018 16:33

PRESTON-MAFHAM, K. (1991)

Madagascar - A Natural History.

224 Seiten.
1. Auflage. Facts on file Ltd., Oxford. ISBN-13: 978-0816024032.

Inhalt:

Madagascar is the fourth largest island in the world, with a landmass of 226,739 square miles - over twice the size of the British Isles. Until 65 million years ago, it was part of continental Africa, but broke free and drifted into the Indian Ocean, gradually isolating its flora and fauna. This illustrated study of the extraordinary wildlife of the island covers the lone evolution of many of the species of plant and animal where all of the mammals, 225 of the 257 species of reptile and almost 80% of its plants are unique to Madagascar.

Freigegeben in P
Donnerstag, 14 Juni 2018 15:59

MÜLLER, J. (2004)

Vögel als Inspektionsbeamte in Eichenwäldern.

LWF Wissen 46: 22-28.

Schlussfolgerungen:

  • Vögel  zeigen  Naturnähe auf  drei Skalenebenen, nämlich Einzelstruktur, Bestand und Landschaft, an.  Wegen  ihrer  hohen  Mobilität können sie diese Indikatorfunktion sehr zeitnah erfüllen.
  • Naturnahe Wälder müssen von Baumarten der potentiellen natürlichen Vegetation dominiert werden.
  • Daneben ist ein intensiver Wechsel von Waldentwicklungsphasen, wie er für temperate Laubwälder  typisch ist, wichtig. Nur so können die vollständigen Artengemeinschaften von Naturwäldern integriert werden.
  • Starke und anbrüchige Altbäume spielen eine Schlüsselrolle und sollten relativ gleichmäßig erhalten  werden.  Dabei  können  großkronige Wirtschaftswaldeichen die eher kleinkronigen Urwaldeichen in ihrer ökologischen Funktion ersetzen.
  • Das Ziel Furnierholz dient sowohl bei kurzschaftigen und großkronigen Mittelwaldbäumen als auch bei alten und langsamgewachsenen Hochwaldeichen den beiden Vogelarten Mittelspecht und Halsbandschnäpper, vorausgesetzt  ein  ausreichender Alteichenvorrat ist auf der Fläche präsent.
Freigegeben in M
Donnerstag, 14 Juni 2018 13:21

MÖCKLI, A. (1995)

Wildsträucher im Siedlungsraum.

Schweizerischer Bund für Naturschutz, Basel / Schweizer Vogelschutz, Zürich. 36 Seiten.

Merkblatt.

Einheimische Bäume und Sträucher gehören zu den wichtigsten Elementen eines naturnahen Gartens, Parks oder einer anderen Freifläche. Sie können ganze Quartiere prägen und bieten vielen Tieren Lebensraum, Nahrung und Brutplätze. Doch die einheimischen Bäume und Sträucher sind unter Druck: Vielerorts müssen sie neuen Bauwerken weichen, oder sie werden durch exotische Gewächse ersetzt. Mittels dieses Merkblatts wollen SBN und SVS die einheimischen Bäume und Sträucher im Siedlungsraum fördern.

Freigegeben in M
Donnerstag, 14 Juni 2018 12:32

MEHRTENS, J. M. (1993)

Schlangen der Welt – Lebensraum, Biologie, Haltung.

Übersetzung ins Deutsche und Bearbeitung: T. Romig..

463 Seiten, Farbfotos. Verlag Franckh-Kosmos, Stuttgart. ISBN 3-440-06710-6.

Kundenrezension:

Diese Buch enthält eine Vielzahl verschiedener Schlangenarten aus aller Welt. Jede Art ist mit Foto, Habitat, Unterarten, Frabformen & Haltungsbedingungen aufgeführt. Allerdings handelt es sich nicht um eine detaillierte wissenschaftliche Abhandlung über die einzelnen Arten. Auf eine Seite kommen ca. 1 bis 3 Arten, bekanntere Arten werden auf mehreren Seiten beschrieben. Auch Beutespektrum und Giftigkeit sind beschrieben. Das Buch gibt Auskunft über Terrarieneinrichtung, Klima und natürliche Umgebung. Verständlich und kurzweilig geschrieben würde ich es jedem Laien nahe legen, der "über den Tellerrand" der eigenen gehaltenen Arten hinaus blicken möchte.

Freigegeben in M
Donnerstag, 14 Juni 2018 14:43

HOFMEISTER, H. (1990)

Lebensraum Wald.

3. Auflage. Verlag Paul Parey, Hamburg und Berlin. ISBN 3-490-17118-7. 276 Seiten.

Inhalt:

Darstellung der Bäume und Sträucher mit Bestimmungsschlüssel, der Waldbodenpflanzen, der Waldgesellschaften und der Beziehungen von Wald und Umwelt. Im Anhang Verzeichnis von Zeigerwerten, Lebensformen und ökologischen Gruppen der berücksichtigten Pflanzenarten.

 

Freigegeben in H
© Peter Dollinger, Zoo Office Bern hyperworx