Diel Feeding Chronologies in Two Sonoran Desert Stream Fishes, Agosia chrysogaster (Cyprinidae) and Pantosteus clarki (Catostomidae)

Fisher, Stuart G.; Busch, David E.; Grimm, Nancy B.

doi:10.2307/3671326

Cited by 16 publications

(5 citation statements)

References 15 publications

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“…Die1 variation in ingestion rate in both May and November supports findings of Fisher et al (1981) that A. chrysoguster feeds during daylight (Fig. 3).…”

Section: Discussionsupporting

confidence: 70%

“…Although C. glomerutu filaments were found in intestines, this alga is charac- terized by a thick cell wall and may prove difficult to digest, thus fish may avoid ingestion of C. glomera& unless it is heavily colonized by more digestible diatom epiphytes. Fisher et al (1981) found that longfin date ate appreciable quantities of the filamentous alga and its epiphytes, but virtually no insects during a June study in Sycamore Creek. In Aravaipa Creek, another lowland Sonoran Desert stream, baetid mayflies were the preferred food of A. chrysoguster (Schreiber & Minckley 1981).…”

Section: Discussionmentioning

confidence: 99%

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Feeding dynamics, nitrogen budgets, and ecosystem role of a desert stream omnivore, Agosia chrysogaster (Pisces: Cyprinidae)

Grimm

1988

Environ Biol Fish

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SynopsisFeeding habits, die1 periodicity and total daily ingestion, and nitrogen budgets of longfin date (Agosia chrysogaster) were examined on two occasions when food quality, but not quantity, differed. Agosia chrysogaster was found to be an opportunistic omnivore, consuming primarily insects when the preferred taxon (baetid mayflies) was abundant in the environment, but consuming primarily algae when mayfly abundance was low. Ingestion provided a better measure of die1 feeding periodicity than gut fullness; feeding was diurnal on both sample dates, but more markedly so when the primary food was algae. Mean nitrogen content of algal foods was low, and A. chrysogaster apparently compensated for this by increasing its daily ingestion rate when algae were the major food. A reduction in nitrogen content of food during digestion from 44% (of dry mass) to less than 1% (in feces) suggested a high assimilation efficiency for nitrogen (nitrogen assimilated/nitrogen consumed = 72-78%). Populations of this abundant and successful cyprinid in Sonoran Desert streams may play an important role in ecosystem nitrogen dynamics. Nitrogen stored in fish biomass comprised 3-6% of the total nitrogen stored in Sycamore Creek, and excretion of ammonia by the fish represented 510% of total nitrogen uptake by algae. Such rapid recycling of usable nitrogen to primary producers is significant in this nitrogen limited stream ecosystem.

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“…Die1 variation in ingestion rate in both May and November supports findings of Fisher et al (1981) that A. chrysoguster feeds during daylight (Fig. 3).…”

Section: Discussionsupporting

confidence: 70%

Section: Discussionmentioning

confidence: 99%

Feeding dynamics, nitrogen budgets, and ecosystem role of a desert stream omnivore, Agosia chrysogaster (Pisces: Cyprinidae)

Grimm

1988

Environ Biol Fish

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“…Agosia is omnivorous, fowood springs likely contributed to smaller individraging primarily on benthic algae and benthic inual size. Standard length of Poeciliopsis at Black vertebrates, but not other fishes (Fisher et al 1981, Draw-Source decreased as time from recoloniza- Schreiber & Minckley 1981, Grimm 1988. Food tion increased, presumably as a result of populahabits of G. purpurea are less well known.…”

Section: Effects Of Gambusia On Poeciliopsismentioning

confidence: 99%

Response of endangered Poeciliopsis occidentalis sonoriensis in the R�o Yaqui drainage, Arizona, to introduced Gambusia affinis

Galat

Robertson

1992

Environ Biol Fish

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“…Introduced crayfish are likely to have pronounced effects in systems such as the Colorado River basin where there were no native omnivorous analogs [36]. While Colorado River basin streams have historically hosted native omnivorous fishes such as longfin dace ( Agosia chrysogaster ) and desert sucker ( Catostomus clarki ), these fishes do not feed on coarse particulate detritus [37].…”

Section: Introductionmentioning

confidence: 99%

Crayfish Impact Desert River Ecosystem Function and Litter-Dwelling Invertebrate Communities through Association with Novel Detrital Resources

Moody

Sabo

2013

PLoS ONE

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Shifts in plant species distributions due to global change are increasing the availability of novel resources in a variety of ecosystems worldwide. In semiarid riparian areas, hydric pioneer tree species are being replaced by drought-tolerant plant species as water availability decreases. Additionally, introduced omnivorous crayfish, which feed upon primary producers, allochthonous detritus, and benthic invertebrates, can impact communities at multiple levels through both direct and indirect effects mediated by drought-tolerant plants. We tested the impact of both virile crayfish (Orconectes virilis) and litter type on benthic invertebrates and the effect of crayfish on detrital resources across a gradient of riparian vegetation drought-tolerance using field cages with leaf litter bags in the San Pedro River in Southeastern Arizona. Virile crayfish increased breakdown rate of novel drought-tolerant saltcedar (Tamarix ramosissima), but did not impact breakdown of drought-tolerant seepwillow (Baccharis salicifolia) or hydric Fremont cottonwood (Populus fremontii) and Gooding's willow (Salix goodingii). Effects on invertebrate diversity were observed at the litter bag scale, but no effects were found at the cage scale. Crayfish decreased alpha diversity of colonizing macroinvertebrates, but did not affect beta diversity. In contrast, the drought-tolerant litter treatment decreased beta diversity relative to hydric litter. As drought-tolerant species become more abundant in riparian zones, their litter will become a larger component of the organic matter budget of desert streams which may serve to homogenize the litter-dwelling community and support elevated populations of virile crayfish. Through impacts at multiple trophic levels, crayfish have a significant effect on desert stream ecosystems.

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Diel Feeding Chronologies in Two Sonoran Desert Stream Fishes, Agosia chrysogaster (Cyprinidae) and Pantosteus clarki (Catostomidae)

Cited by 16 publications

References 15 publications

Feeding dynamics, nitrogen budgets, and ecosystem role of a desert stream omnivore, Agosia chrysogaster (Pisces: Cyprinidae)

Feeding dynamics, nitrogen budgets, and ecosystem role of a desert stream omnivore, Agosia chrysogaster (Pisces: Cyprinidae)

Response of endangered Poeciliopsis occidentalis sonoriensis in the R�o Yaqui drainage, Arizona, to introduced Gambusia affinis

Crayfish Impact Desert River Ecosystem Function and Litter-Dwelling Invertebrate Communities through Association with Novel Detrital Resources

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