Primary productivity of papyrus (Cyperus papyrus) in a tropical swamp; Lake Naivasha, Kenya

Muthuri, Francis M.; Jones, Michael B.; Imbamba, S. K.

doi:10.1016/0144-4565(89)90077-2

Cited by 116 publications

(53 citation statements)

References 10 publications

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“…The estimated NPP in Lubigi wetland were within the range reported by many authors (Thompson et al, 1979;Muthuri et al, 1989;Jones and Muthuri, 1997;Boar, 2006;Bakari et al, 2007). The non-significant difference in seasonal NPP conforms to the study by Muthuri et al (1989) in Naviasha wetland, Kenya.…”

Section: Discussionsupporting

confidence: 67%

“…However, NPP values were slightly higher than 22.1 g m -2 d -1 (Saunders et al, 2007) and 21 g m -2 d -1 (Muthuri et al, 1989). The (Muthuri et al, 1989). Productivity differences in papyrus wetlands are attributed to structural differences which affect the amount of carbon that can be assimilated by the plant community (Jones, 1988).…”

Section: Discussionmentioning

confidence: 90%

“…The non-significant difference in seasonal NPP conforms to the study by Muthuri et al (1989) in Naviasha wetland, Kenya. However, NPP values were slightly higher than 22.1 g m -2 d -1 (Saunders et al, 2007) and 21 g m -2 d -1 (Muthuri et al, 1989). The (Muthuri et al, 1989).…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, natural regeneration capacity in papyrus wetlands contributes to structural changes with effect on growth (Bakari et al, 2007). This is because papyrus wetlands exhibit establishment, growth and mortality concurrently (Muthuri et al, 1989), which imply a balanced trade-off of resources characteristic of tropical environment. However, environmental factors have been reported to affect magnitude of growth, shift carbon allocation, change productivity and shift mode of reproduction (Hunt, 1982;Beadle, 1993;Fennessy et al, 1994;Jones, 1993).…”

Section: Discussionmentioning

confidence: 99%

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Response of Cyperus papyrus productivity to changes in relative humidity, temperature and photosynthetically active radiation

Opio¹,

Jones²,

Kansiime³

et al. 2017

Afr. J. Plant Sci.

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Ecosystem development is related to climatic conditions. To assess the effect of seasonal changes in climate factors on papyrus ecosystem development, community biomass was estimated nondestructively and climate factors recorded in the wetland. Absolute aerial biomass and productivity were not significantly different between wet and dry seasons. Although there was significant vapour pressure deficit change over the seasons, the impact on net primary productivity was not significant, but exhibited positive association during dry season. Primary productivity was positively related to photosynthetically active radiation during both dry and wet seasons. Except for the dry season that accounted for 26.1% of primary productivity, that of the wet season was independent (0%) of measured weather variables.

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Section: Discussionsupporting

confidence: 67%

Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Response of Cyperus papyrus productivity to changes in relative humidity, temperature and photosynthetically active radiation

Opio¹,

Jones²,

Kansiime³

et al. 2017

Afr. J. Plant Sci.

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“…Papyrus productivity in relation to differences in exploitation activities are represented by the three study sites with different exploitation pressures and water levels [2] [4]. This study focused on papyrus aerial biomass (culm density and growth rate) which is important in determining the overall productivity of the system as they contribute more than 50% of the plant biomass [10] [13] [14].…”

Section: Introductionmentioning

confidence: 99%

<i>Cyperus papyrus</i> L. Growth Rate and Mortality in Relation to Water Quantity, Quality and Soil Characteristics in Nyando Floodplain Wetland, Kenya

Rongoei¹,

Outa²

2016

OJE

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Cyperus papyrus (L.) growth rate and mortality is influenced by environmental conditions prevailing in the wetland. To assess growth dynamics of C. papyrus in relation to water depth and anthropogenic (exploitation) pressures, monthly and bi-monthly measurement of culm length and girth were done between June and December 2010 (period 1) and April to June 2011 (period 2). Three study sites were selected based on the water levels and livelihood-driven exploitation pressures. Surrogate measurements of individual culm height and girth were done in three 1 m 2 quadrats in each site to determine the growth rate of papyrus. Water depth was lowest in period 2 (dry) and highest in period 1 (wet) which was related to the livelihood activities being highest in period two and lowest in period one. Culm mortality occurred throughout the study period with 64% due to natural senescing while insect/rodent accounted for 19%. Papyrus growth was higher in Singida (2.5 ± 0.2 cm/day) representing less disturbed site and least in Wasare (1.4 ± 0.1 cm/day) which was highly disturbed. Multiple regression models for culm length showed culm density, mean length and NH 4 negatively influenced growth rate while site as a dummy variable, water depth, SRP and TP had positive effects on papyrus growth rate. Understanding growth rate and causes of mortality in papyrus is important to establish sustainable management strategies of this ecosystem to maintain its integrity.

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Quantifying resistance and resilience to local extinction for conservation prioritization

Donaldson

Bennie

Wilson

et al. 2019

Ecological Applications

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Species‐focused conservation planning is often based on reducing local extinction risk at key sites. However, with increasing levels of habitat fragmentation and pressures from climate change and overexploitation, surrounding landscapes also influence the persistence of species populations, and their effects are increasingly incorporated in conservation planning and management for both species and communities. Here, we present a framework based on metapopulation dynamics in fragmented landscapes, for quantifying the survival (resistance) and reestablishment of species populations following localized extinction events (resilience). We explore the application of this framework to guide the conservation of a group of threatened bird species endemic to papyrus (Cyperus papyrus) swamps in East and Central Africa. Using occupancy data for five species collected over two years from a network of wetlands in Uganda, we determine the local and landscape factors that influence local extinction and colonization, and map expected rates of population turnover across the network to draw inferences about the locations that contribute most to regional resistance and resilience for all species combined. Slight variation in the factors driving extinction and colonization between individual papyrus birds led to species‐specific differences in the spatial patterns of site‐level resistance and resilience. However, despite this, locations with the highest resistance and/or resilience overlapped for most species and reveal where resources could be invested for multispecies persistence. This novel simplified framework can aid decision making associated with conservation planning and prioritization for multiple species residing in overlapping, fragmented habitats; helping to identify key sites that warrant urgent conservation protection, with consideration of the need to adapt and respond to future change.

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Primary productivity of papyrus (Cyperus papyrus) in a tropical swamp; Lake Naivasha, Kenya

Cited by 116 publications

References 10 publications

Response of Cyperus papyrus productivity to changes in relative humidity, temperature and photosynthetically active radiation

Response of Cyperus papyrus productivity to changes in relative humidity, temperature and photosynthetically active radiation

<i>Cyperus papyrus</i> L. Growth Rate and Mortality in Relation to Water Quantity, Quality and Soil Characteristics in Nyando Floodplain Wetland, Kenya

Quantifying resistance and resilience to local extinction for conservation prioritization

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Primary productivity of papyrus (Cyperus papyrus) in a tropical swamp; Lake Naivasha, Kenya

Cited by 116 publications

References 10 publications

Response of Cyperus papyrus productivity to changes in relative humidity, temperature and photosynthetically active radiation

Response of Cyperus papyrus productivity to changes in relative humidity, temperature and photosynthetically active radiation

&lt;i&gt;Cyperus papyrus&lt;/i&gt; L. Growth Rate and Mortality in Relation to Water Quantity, Quality and Soil Characteristics in Nyando Floodplain Wetland, Kenya

Quantifying resistance and resilience to local extinction for conservation prioritization

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Product

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<i>Cyperus papyrus</i> L. Growth Rate and Mortality in Relation to Water Quantity, Quality and Soil Characteristics in Nyando Floodplain Wetland, Kenya