Food Partitioning among Fishes of the Virgin River

Greger, Paul D.; Deacon, James E.

doi:10.2307/1445871

Cited by 32 publications

(29 citation statements)

References 11 publications

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“…2.5, I n Greger (1983) showed that, based on diurnal collections from Virgin River near Beaver Dam Wash in June 1979, Hydropsyche was negatively selected while simuliid larvae were positively selected. This study shows that situation to be valid for the diurnal period but reversed at night.…”

Section: Resultsmentioning

confidence: 99%

“…Elliot (1968) and Elliot & Minshall (1968) reported increased nocturnal drift. Greger (1983) reported a seasonal l-8% increase in Hydropsyche in the nocturnal drift in Virgin River in June 1979. The endangered woundfin consistently maintained an abundant and reproducing population in the Virgin River near the inflow of Beaver Dam Wash in Arizona (Deacon 1979, Deacon & Hardy 1984 until 1985 when the population declined coincident with a major increase in the red shiner population (Deacon unpublished data).…”

Section: Resultsmentioning

confidence: 99%

“…The woundfin, Plagopterus argentissimus, an endangered cyprinid fish of the mainstream Virgin River in Utah, Arizona and Nevada (Deacon 1979) is an omnivore capable of specializing on particular foods that become seasonally abundant (Greger 1983). This fish selects gravel-rubble substrate.…”

Section: Introductionmentioning

confidence: 99%

“…preferably in current, for spawning (Greger & Deacon 1982), produces a larger year-class when moderate flow conditions prevail in the River (Deacon & Hardy 1984), and is the most abundant native fish species in the lower mainstream Virgin River (Cross 1975(Cross , 1978(Cross , 1985. Reduced dietary diversity, lower numbers of prey ingested and slight reductions in food overlap values with introduced red shiner Notropis lutrensis suggest that competitive interactions may occur between woundfin and red shiner during periods of food scarcity (Greger 1983). Invertebrate populations in Virgin River are at their annual minimum in June following spring runoff which creates high sediment turbidity, scours the river bed and nearly eliminates aquatic vegetation.…”

Section: Introductionmentioning

confidence: 99%

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Diel food utilization by woundfin, Plagopterus argentissimus, in Virgin River, Arizona

Greger

Deacon

1987

Environ Biol Fish

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Diel food utilization by woundfin, Plagopterus argentissimus, in Virgin River, Arizona

Greger

Deacon

1987

Environ Biol Fish

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“…Freed from the predatory, parasitic and competitive restraints experienced in their native environments, many of these animals have had severe impacts on indigenous fauna and flora. One way invading animals can impact the natural ecosystem is through competition and there are many examples from around the world of the negative, competitive impact of introduced mammals (Manchester and Bullock, 2000), birds (Miller, 1967), fish (Greger and Deacon, 1988;Zale and Gregory, 1990) and invertebrates (Juliano, 1998;Byers, 2000;Manchester and Bullock, 2000;Kiesecker et al, 2001;Schellhorn et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

No short-term impact of honey bees on the reproductive success of an Australian native bee

Paini

Williams²,

Roberts

2005

Apidologie

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-The European honey bee was introduced to Australia 180 years ago and feral populations now occupy most coastal environments. Although much debate has taken place regarding the possible impact of honey bees on Australian native bees, there has been little direct research. This study presents the results of a replicated Before-After Control-Impact (BACI) experiment simulating the putative impact of feral honey bees on an undescribed species of Australian solitary bee (Megachile sp. M323/F367). Although a large resource overlap occurred between the two species, there was no significant change in the reproductive success of the native bee. The realised precision of the experiment was assessed and showed appropriate sensitivity for three important reproductive variables. The native bee, being better adapted to the high summer temperatures experienced during the period of this experiment, may be able to withstand honey bee competition.BACI / competition / Apis mellifera / Megachile / resource overlap / introduced species

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The trophic ecology of a desert river fish assemblage: influence of season and hydrologic variability

Behn

Baxter

2019

Ecosphere

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Citation: Behn, K. E., and C. V. Baxter. 2019. The trophic ecology of a desert river fish assemblage: influence of season and hydrologic variability.Abstract. Foodweb analyses can provide insight as to how species persist in naturally dynamic environments and how these communities may respond to anthropogenic alteration. In the remaining undammed rivers of the arid southwestern United States, it is thought that plasticity in feeding behavior allows native fishes to thrive in the context of natural fluctuations in temperature, sediment, and resource availability associated with extreme swings in season and hydrology. There have been few evaluations of this hypothesis, in part owing to the rarity of rivers that retain their natural environmental dynamics and complement of native species. We investigated the feeding ecology of the fish assemblage of one such river, the Little Colorado River, Arizona, focusing on four native species: bluehead sucker (Catostomus discobolus), flannelmouth sucker (Catostomus latipinnis), speckled dace (Rhinichthys osculus), and endangered humpback chub (Gila cypha). Over two years, we sampled fish diets in July, September, January, March, and June, encompassing turbid and clear-water conditions across seasons. We quantified food resource contributions to fish diets in fish-centered food webs, comparing diversity of trophic linkages and linkage-strength distribution across time. We used ordination analyses to investigate differences in diets among species and changes in diet composition across seasons and conducted seasonal comparisons of gut fullness. We observed a high diversity of dietary items (as absolute numbers and consumer-resource ratios) within a fish assemblage that was apparently resistant to extreme and recurrent environmental variability. Fish diet diversity was 29 that of the nearby dammed Colorado River's tailwater, and over 50% of fish-resource linkages were weak (<1% of species' diet). Native fishes consumed a mix of terrestrial and aquatic resources. Notably, the water column-feeding humpback chub consumed the largest percentage of terrestrially derived food items and appeared to capitalize on food resources made available by a summer flash flood, consuming twice as much during this flood than during other seasons (based on gut fullness, corrected by estimates of food quality). Other fishes exhibited similar dietary variation. Such opportunist/generalist strategies, coupled with diverse food resources, may be important to the persistence of these and other native fishes in dynamic environments.

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Food Partitioning among Fishes of the Virgin River

Cited by 32 publications

References 11 publications

Diel food utilization by woundfin, Plagopterus argentissimus, in Virgin River, Arizona

Diel food utilization by woundfin, Plagopterus argentissimus, in Virgin River, Arizona

No short-term impact of honey bees on the reproductive success of an Australian native bee

The trophic ecology of a desert river fish assemblage: influence of season and hydrologic variability

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