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Journal Article 2007-08-01

Simple State space models in a mixed model framework

Autor: Piepho, Hans-Peter Ogutu, Joseph O.

State-space models play a central role in time series analysis. Biological time series, which present trend, seasonal, and cyclic fluctuations, can be well described by such models. In addition, biological experiments and surveys often have a relatively complex design structure calling for specia...

Enlace original: https://cgspace.cgiar.org/handle/10568/1291

Investigación en Agricultura

MODELS

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Piepho, Hans-Peter , Ogutu, Joseph O. , [Simple State space models in a mixed model framework] , Simple State space models in a mixed model framework

Journal Article 2016-09-27

Extreme wildlife declines and concurrent increase in livestock numbers in Kenya: What are the causes?

Autor: Ogutu, Joseph O. Piepho, Hans-Peter Said, Mohammed Yahya Ojwang, G.O. Njino, L.W. Kifugo, S.C. Wargute, P.W.

There is growing evidence of escalating wildlife losses worldwide. Extreme wildlife losses have recently been documented for large parts of Africa, including western, Central and Eastern Africa. Here, we report extreme declines in wildlife and contemporaneous increase in livestock numbers in Keny...

Enlace original: https://cgspace.cgiar.org/handle/10568/77705

Investigación en Agricultura

LIVESTOCK

WILDLIFE

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Ogutu, Joseph O. , Piepho, Hans-Peter , Said, Mohammed Yahya , Ojwang, G.O. , Njino, L.W. , Kifugo, S.C. , Wargute, P.W. , [Extreme wildlife declines and concurrent increase in livestock numbers in Kenya: What are the causes?] , Extreme wildlife declines and concurrent increase in livestock numbers in Kenya: What are the causes?

Journal Article 2014-09-01

Impacts of climate change and variability on cattle production in southern Ethiopia: Perceptions and empirical evidence

Autor: Megersa, B. Markemann, A. Angassa, A. Ogutu, Joseph O. Piepho, Hans-Peter Zarate, A.V.

Climate change and variability can severely constrain the productivity of pastoral herds by reducing water availability, forage production and quality, and hence the carrying capacity of rangelands. In particular, the risk of heavy livestock losses suffered during recurrent severe droughts associ...

Enlace original: https://cgspace.cgiar.org/handle/10568/41878

Investigación en Agricultura

CLIMATE CHANGE

ANIMAL PRODUCTION

CATTLE

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Megersa, B. , Markemann, A. , Angassa, A. , Ogutu, Joseph O. , Piepho, Hans-Peter , Zarate, A.V. , [Impacts of climate change and variability on cattle production in southern Ethiopia: Perceptions and empirical evidence] , Impacts of climate change and variability on cattle production in southern Ethiopia: Perceptions and empirical evidence

Journal Article 2014-03-20

Responses of phenology, synchrony and fecundity of breeding by African ungulates to interannual variation in rainfall

Autor: Ogutu, Joseph O. Piepho, Hans-Peter Dublin, H.T.

Context: The timing and synchrony of births are important components of fitness among ungulates living in seasonal environments. Aims: We investigated the effects of rainfall variation on interannual variation in the timing, synchrony and prolificity of births for six African ungulate species in...

Enlace original: https://cgspace.cgiar.org/handle/10568/52343

Investigación en Agricultura

WILDLIFE

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Ogutu, Joseph O. , Piepho, Hans-Peter , Dublin, H.T. , [Responses of phenology, synchrony and fecundity of breeding by African ungulates to interannual variation in rainfall] , Responses of phenology, synchrony and fecundity of breeding by African ungulates to interannual variation in rainfall

Journal Article 2017

Quantifying uncertainty on sediment loads using bootstrap confidence intervals

Autor: Slaets, J.I.F. Piepho, Hans-Peter Schmitter, Petra S. Hilger, T. Cadisch, Georg

Load estimates are more informative than constituent concentrations alone, as they allow quantification of on- and off-site impacts of environmental processes concerning pollutants, nutrients and sediment, such as soil fertility loss, reservoir sedimentation and irrigation channel siltation. Whil...

Enlace original: https://cgspace.cgiar.org/handle/10568/81200

Investigación en Agricultura

SEDIMENT

UNCERTAINTY

POLLUTANTS

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Slaets, J.I.F. , Piepho, Hans-Peter , Schmitter, Petra S. , Hilger, T. , Cadisch, Georg , [Quantifying uncertainty on sediment loads using bootstrap confidence intervals] , Quantifying uncertainty on sediment loads using bootstrap confidence intervals

Journal Article 2016

Sediment-associated organic carbon and nitrogen inputs from erosion and irrigation to rice fields in a mountainous watershed in Northwest Vietnam

Autor: Slaets, J.I.F. Schmitter, Petra S. Hilger, T. Hue, D.T.T. Piepho, Hans-Peter Vien, T.D. Cadisch, Georg

Maintaining indigenous nutrient supply and positive nutrient balances are key factors in sustaining rice yields. Irrigation systems act as conveyers for water, sediments and nutrients throughout landscapes, especially in mountainous, cultivated tropical areas where erosivity is usually high. Cont...

Enlace original: https://cgspace.cgiar.org/handle/10568/77050

Investigación en Agricultura

SEDIMENTATION

SOIL FERTILITY

ORGANIC FERTILIZERS

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Slaets, J.I.F. , Schmitter, Petra S. , Hilger, T. , Hue, D.T.T. , Piepho, Hans-Peter , Vien, T.D. , Cadisch, Georg , [Sediment-associated organic carbon and nitrogen inputs from erosion and irrigation to rice fields in a mountainous watershed in Northwest Vietnam] , Sediment-associated organic carbon and nitrogen inputs from erosion and irrigation to rice fields in a mountainous watershed in Northwest Vietnam

Journal Article 2017

Wildlife population dynamics in human-dominated landscapes under community-based conservation: The example of Nakuru Wildlife Conservancy, Kenya

Autor: Ogutu, Joseph O. Kuloba, B. Piepho, Hans-Peter Kanga, E.

Wildlife conservation is facing numerous and mounting challenges on private and communal lands in Africa, including in Kenya. We analyze the population dynamics of 44 common wildlife species in relation to rainfall variation in the Nakuru Wildlife Conservancy (NWC), located in the Nakuru-Naivasha...

Enlace original: https://cgspace.cgiar.org/handle/10568/79930

Investigación en Agricultura

WILDLIFE

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Ogutu, Joseph O. , Kuloba, B. , Piepho, Hans-Peter , Kanga, E. , [Wildlife population dynamics in human-dominated landscapes under community-based conservation: The example of Nakuru Wildlife Conservancy, Kenya] , Wildlife population dynamics in human-dominated landscapes under community-based conservation: The example of Nakuru Wildlife Conservancy, Kenya

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Resultados de búsqueda

Simple State space models in a mixed model framework

Extreme wildlife declines and concurrent increase in livestock numbers in Kenya: What are the causes?

Impacts of climate change and variability on cattle production in southern Ethiopia: Perceptions and empirical evidence

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Responses of phenology, synchrony and fecundity of breeding by African ungulates to interannual variation in rainfall

Quantifying uncertainty on sediment loads using bootstrap confidence intervals

Sediment-associated organic carbon and nitrogen inputs from erosion and irrigation to rice fields in a mountainous watershed in Northwest Vietnam

Wildlife population dynamics in human-dominated landscapes under community-based conservation: The example of Nakuru Wildlife Conservancy, Kenya