Detrital Fruit Processing in a Hawaiian Stream Ecosystem1

Larned, Scott T.; Chong, Charles T.; Punewai, Noelani

doi:10.1646/0006-3606(2001)033[0241:dfpiah]2.0.co;2

Cited by 6 publications

(4 citation statements)

References 28 publications

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“…Mean biomass accumulation in the summer (344 g day À1 {513 g km À2 day À1 }) was greater than that in the winter months (199 g day À1 {297 g km À2 day À1 }), but the difference was not significant (P ¼ 0:3). Larned et al (2001) reported input of fruits (mostly guava) from upstream sources of up to 300 g day À1 for some months in a small Hawaiian stream, although their system and methods differed from ours. The very high variability in accumulation at the grate was probably the cause for the inability to distinguish the two seasons.…”

Section: Was Between the Two Sites With Full Flow (Ad And Bp)mentioning

confidence: 68%

Effects of Water Removal on a Hawaiian Stream Ecosystem

Kinzie¹,

Chong²,

Devrell³

et al. 2006

Pacific Science

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A 3-year study of Wainiha River on Kaua'i, Hawai'i, was carried out to determine the impact that water removal had on key stream ecosystem parameters and functions. The study area included a diversion dam for a hydroelectric plant that removes water at an elevation of 213 m and returns it to the stream about 6 km downstream at an elevation of 30 m. There were two highelevation sites, one with undiverted flow and one with reduced flow, and two low-elevation sites, one with reduced flow and one with full flow restored. Monthly samples were taken of instream and riparian invertebrates and plants. When samples from similar elevations were compared, dewatered sites had lower concentrations of benthic photosynthetic pigments than full-flow sites, and benthic ash-free dry mass (AFDM) was higher at the two low-elevation sites regardless of flow. Benthic chlorophyll a (chl a) and AFDM were higher in summer months than in the winter. Benthic invertebrate abundance was highest at the full-flow, low-elevation site and benthic invertebrate biomass was highest at the full-flow, high-elevation site. Season had only marginal effects on abundance and biomass of benthic invertebrates. Diversity of benthic invertebrates was higher at the more-downstream sites. Abundance of drifting invertebrates was highest at the site above the diversion dam and generally higher in winter than in summer months. Biomass of drifting invertebrates was also highest at the above-dam site but there was little seasonal difference. Almost all parameters measured were lowest at the site just downstream of the diversion dam. The biotic parameters responded only weakly to flows that had occurred up to 1 month before the measurements were made. Flow, elevation, and season interact in complex ways that impact ecosystem parameters and functions, but water diversion can override all these environmental factors.In the history of limnology, the study of rivers (lotic systems) has lagged behind that of lakes (lentic systems). By the first decades of the twentieth century the basic understanding of the dynamics of thermal stratification provided a common framework for numerous subsequent studies of lentic systems (Ruttner 1953, Hutchinson 1957. For a long time students of rivers had no such unifying theme: hydrologists studied channel formation and, more practically, flood control, and biologists tended to focus on game fish or the production of food for these fish (see Hynes 1970 and Cummins et al. 1995 for historical accounts). Realization of the importance of complex interactions between the geomorphological setting of the stream and the physical and biological properties of the stream system set the stage for a conceptual model of stream dynamics based on func-

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Section: Was Between the Two Sites With Full Flow (Ad And Bp)mentioning

confidence: 68%

Effects of Water Removal on a Hawaiian Stream Ecosystem

Kinzie¹,

Chong²,

Devrell³

et al. 2006

Pacific Science

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“…Tarebia granifera has previously been classified as both detritivore and grazer [31] , [63] . This study shows that T. granifera has a generalist diet which includes a wide variety of food sources.…”

Section: Discussionmentioning

confidence: 99%

Stable Isotope Evidence for Dietary Overlap between Alien and Native Gastropods in Coastal Lakes of Northern KwaZulu-Natal, South Africa

Miranda

Perissinotto

2012

PLoS ONE

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Background Tarebia granifera (Lamarck, 1822) is originally from South-East Asia, but has been introduced and become invasive in many tropical and subtropical parts of the world. In South Africa, T. granifera is rapidly invading an increasing number of coastal lakes and estuaries, often reaching very high population densities and dominating shallow water benthic invertebrate assemblages. An assessment of the feeding dynamics of T. granifera has raised questions about potential ecological impacts, specifically in terms of its dietary overlap with native gastropods.Methodology/Principal FindingsA stable isotope mixing model was used together with gut content analysis to estimate the diet of T. granifera and native gastropod populations in three different coastal lakes. Population density, available biomass of food and salinity were measured along transects placed over T. granifera patches. An index of isotopic (stable isotopes) dietary overlap (IDO, %) aided in interpreting interactions between gastropods. The diet of T. granifera was variable, including contributions from microphytobenthos, filamentous algae (Cladophora sp.), detritus and sedimentary organic matter. IDO was significant (>60%) between T. granifera and each of the following gastropods: Haminoea natalensis (Krauss, 1848), Bulinus natalensis (Küster, 1841) and Melanoides tuberculata (Müller, 1774). However, food did not appear to be limiting. Salinity influenced gastropod spatial overlap. Tarebia granifera may only displace native gastropods, such as Assiminea cf. ovata (Krauss, 1848), under salinity conditions below 20. Ecosystem-level impacts are also discussed.Conclusion/SignificanceThe generalist diet of T. granifera may certainly contribute to its successful establishment. However, although competition for resources may take place under certain salinity conditions and if food is limiting, there appear to be other mechanisms at work, through which T. granifera displaces native gastropods. Complementary stable isotope and gut content analysis can provide helpful ecological insights, contributing to monitoring efforts and guiding further invasive species research.

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“…Tropical rivers differ fundamentally from their temperate counterparts in that they receive a year-round supply of leaf litter inputs (Stout 1980), whereas temperate rivers receive an annual pulse of leaf litter associated with autumn leaf fall (Meyer et al 1998). In addition, tropical rivers receive year-round fruit inputs, which are high in soluble sugars and may provide a readily bioavailable source of C to riverine bacteria (Baker et al 1998, Larned et al 2001.…”

Section: Comparison Of Dissolved Organic Carbon Bioavailability Frommentioning

confidence: 99%

Comparison of Dissolved Organic Carbon Bioavailability from Native and Invasive Vegetation along a Hawaiian River

Wiegner

Tubal

2010

Pacific Science

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Riparian litter fall is an important source of organic matter to rivers and accounts for a large fraction of their dissolved organic carbon (DOC) load. DOC is metabolically important in rivers, and therefore changes in riparian vegetation species composition should affect riverine DOC bioavailability. Worldwide, invasive vegetation composes a large percentage of riparian vegetation. In Hawai'i, riparian vegetation changes from native to invasive species with decreasing elevation. To assess how changes in riparian vegetation affect riverine DOC dynamics, we compared DOC bioavailability from native (Acacia koa and Metrosideros polymorpha) and invasive (Falcataria moluccana and Psidium cattleianum) riparian trees to freshwater and estuarine bacteria from the Wailuku River on Hawai'i Island through dark bioassays. DOC bioavailabilities in riverine and estuarine waters were similar among all riparian vegetation types. In contrast, vegetation-derived DOC was more bioavailable (52% e 4%) than the riverine and estuarine DOC (14% e 3%). Combining DOC bioavailability and leaf litter input data from our native and invaded riparian sites suggests that a shift in leaf litter inputs from native to invasive species may increase the amount of bioavailable DOC entering Hawaiian rivers and streams. This DOC input has the potential to impact the metabolism and food webs of downstream ecosystems.

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Detrital Fruit Processing in a Hawaiian Stream Ecosystem1

Cited by 6 publications

References 28 publications

Effects of Water Removal on a Hawaiian Stream Ecosystem

Effects of Water Removal on a Hawaiian Stream Ecosystem

Stable Isotope Evidence for Dietary Overlap between Alien and Native Gastropods in Coastal Lakes of Northern KwaZulu-Natal, South Africa

Comparison of Dissolved Organic Carbon Bioavailability from Native and Invasive Vegetation along a Hawaiian River

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