Intrafragment riverscape conservation for an imperiled, small-bodied, pelagic-broadcast spawning minnow: speckled chub (<i>Macrhybopsis aestivalis</i>)

Hoagstrom, Christopher W.; Archdeacon, Thomas P.; Davenport, Stephen R.; Propst, David L.; Brooks, James E.

doi:10.1139/cjfas-2014-0191

Cited by 10 publications

(14 citation statements)

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“…However, appropriate or suitable habitat is poorly understood for most PBS species (see Habitat section). Examples of physical aspects of the habitat template associated with PBS species include particular channel‐modifying structures in the Missouri River (Ridenour et al., ), as well as continuums of depth, velocity and substrate composition in the Arkansas River (Luttrell et al., ), Rio Grande (Heard et al., ), Brazos River (Wilde & Durham, ) and Pecos River (Hoagstrom, Brooks & Davenport, ; Hoagstrom, Archdeacon, Davenport, Propst & Brooks, ). In each of these examples, stream flow‐governed habitat templates are the “master variable” (sensu Power, Sun, Parker, Dietrich & Wootton, ) regulating habitat availability for PBS species (Hoagstrom, Brooks & Davenport, ; Hoagstrom, Brooks & Davenport, ; Worthington, Brewer, Farless, et al., ; Worthington, Brewer, Grabowski, et al., ).…”

Section: Discussionmentioning

confidence: 99%

“…Habitat templates function as multiscale filters regulating the occurrences and abundances of species, and appropriate habitat must be maintained to ensure species persistence (Poff & Ward, 1990 , Rio Grande , Brazos River (Wilde & Durham, 2013) and Pecos River (Hoagstrom, Brooks & Davenport, 2008a;Hoagstrom, Archdeacon, Davenport, Propst & Brooks, 2015). In each of these examples, stream flowgoverned habitat templates are the "master variable" (sensu Power, Sun, Parker, Dietrich & Wootton, 1995) regulating habitat availability for PBS species (Hoagstrom, Brooks & Davenport, 2008a;Hoagstrom, Brooks & Davenport, 2008b;Worthington, Brewer, Farless, et al, 2014;.…”

Section: Habitat Changementioning

confidence: 99%

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The emblematic minnows of the North American Great Plains: A synthesis of threats and conservation opportunities

et al. 2017

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Anthropogenic changes to the Great Plains rivers of North America have had a large, negative effect on a reproductive guild of pelagic‐broadcast spawning (PBS) cyprinid fishes. The group is phylogenetically diverse, with multiple origins of the PBS mode. However, because of incomplete life‐history information, PBS designation often relies only on habitat and egg characteristics. We identified 17 known or candidate PBS fishes and systematically synthesized the literature on their biology and ecology in relation to major threats to persistence. Research output on an individual species was unrelated to conservation status, but positively correlated with breadth of distribution. The PBS species have opportunistic life‐history strategies and are typically short‐lived (generally 1–3 years) fishes. Many PBS species have truncated ranges showing declines in both distribution and abundance, especially those endemic to the Rio Grande catchment. Fundamental habitat associations are unknown for many species, particularly regarding seasonal shifts and early life stages. Critical thermal tolerances have been quantified for five PBS species and are generally >35°C. Turbidity and salinity changes are linked to responses at multiple life stages, but information is lacking on interactions between water quality and quantity. Hydrologic alteration appears to be a primary threat to PBS species, through complex interactions with landscape fragmentation, and habitat change. We highlight areas where scientific and management communities are lacking information and underline areas of potential conservation gain.

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Section: Discussionmentioning

confidence: 99%

Section: Habitat Changementioning

confidence: 99%

The emblematic minnows of the North American Great Plains: A synthesis of threats and conservation opportunities

et al. 2017

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“…Hoagstrom et al . (, ) have shown that differences in ecological conditions among inter‐dam river reaches have a substantial influence on the composition of fish assemblages in the Middle Pecos.…”

Section: Discussionmentioning

confidence: 99%

Aquatic food‐web structure along a salinized dryland river

2017

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Summary Very little is known about the ecosystem impacts of river salinization despite expectations for global increases in salinization with growing water demand and climate change. In some rivers in the southwestern United States, salinization has occurred as a result of natural saline inputs exacerbated by flow alteration and other anthropogenic impacts. Salinization in the Pecos River has been linked to declines in fish diversity, but impacts on the structure of aquatic food webs have not been investigated. We assessed variation in local food webs along the longitudinal gradient of the main stem Pecos River by estimating carbon sources, trophic positions and assemblage‐wide trophic structure for aquatic consumers at 12 sites using stable isotope analysis (δ13C and δ15N). Temporal variation across seasons was also examined for common fish species at a subset of sites. Consumer richness, food‐chain length and assemblage‐wide niche breadth were inversely related to specific conductivity. Mixing models revealed differences in sources of dietary carbon supporting fish production along the longitudinal fluvial gradient, with a shift towards reliance on algal production in the salinized reaches of the river. Trophic niche breadth was greatest for assemblages in less degraded sites with higher fish species richness. Local food webs in salinized sites were dominated by euryhaline species and had shorter food chains and narrower assemblage‐wide niche breadths. Across seasons, δ13C and δ15N signatures remained fairly constant for five common fish species. Our results suggest that salinization in portions of the Pecos River constrains the diversity of consumers and trophic resources in local food webs. Characterising changes in food‐web structure in relation to salinization and other environmental changes is important for habitat assessment, stream restoration and other conservation strategies.

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“…For instance, the low flow recruitment hypotheses (LFRH) postulate that periods of low flow when water temperatures and prey densities are high can be advantageous to small-bodied fishes that produce multiple clutches of planktonic (suspended by currents) or demersal (sinking) ova during a protracted summer spawning season (Humphries, King, & Koehn, 1999). Dryland river studies have found that small-bodied fish recruitment is unrelated to flow (Hoagstrom, Archdeacon, Davenport, Propst, & Brooks, 2014), recruitment is most successful at intermediate flows (Moore & Thorp, 2008), or that exceptionally low flow periods are detrimental to recruitment for some populations (Durham & Wilde, 2009;Perkin, Gido, Costigan, Daniels, & Johnson, 2015;. Dryland river studies have found that small-bodied fish recruitment is unrelated to flow (Hoagstrom, Archdeacon, Davenport, Propst, & Brooks, 2014), recruitment is most successful at intermediate flows (Moore & Thorp, 2008), or that exceptionally low flow periods are detrimental to recruitment for some populations (Durham & Wilde, 2009;Perkin, Gido, Costigan, Daniels, & Johnson, 2015;.…”

mentioning

confidence: 99%

“…As a second step, we measured age 0 recruitment using time series length data and length-based models to estimate age structure based on the relationship between time and fish growth (Hoagstrom et al, 2014;Shepherd, 1987). We first characterized the chronology of gonad development to assess reproductive activity during summer months for all six species.…”

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confidence: 99%

Extreme drought causes fish recruitment failure in a fragmented Great Plains riverscape

Perkin

Starks²,

Pennock

et al. 2019

Ecohydrology

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Dryland stream fishes are adapted to highly connected habitats with unpredictable hydrologic conditions, including frequent low flows and sometimes extreme drought.The low flow recruitment hypothesis predicts that some fishes spawn in main channel habitats during low flows when water temperatures and prey densities are high.However, extreme low flows during drought periods might be disruptive even among fishes whose life histories otherwise benefit from lower flows. We studied recruitment dynamics of six fishes (family Cyprinidae) at 15 sites in a fragmented Great Plains riverscape in Kansas, USA, during 2 years of extreme drought. We tracked the chronology of gonadal development and age 0 recruitment to test the hypothesis that recruitment by fishes that broadcast spawn planktonic ova would be less successful compared with fishes that spawn demersal or adhesive ova. We found all six taxa were reproductively active but recruitment was evident for only four.The two species for which recruitment was not evident, peppered chub (Macrhybopsis tetranema) and silver chub (Macrhybopsis storeriana), are confirmed or suspected pelagic-broadcast spawning fishes that have declined in other fragmented and dewatered Great Plains riverscapes. Our data highlight the potential for extreme low flows within isolated stream fragments to cause complete or near-complete recruitment failure for pelagic-broadcast spawning fishes, especially those with small population sizes. Failed recruitment during extreme drought may be related to spawning mode, ova characteristics, or both. Our work informs management of fish diversity in drought-prone riverscapes by establishing mechanistic linkages among extreme drought, fish recruitment, and assemblage structure.

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Intrafragment riverscape conservation for an imperiled, small-bodied, pelagic-broadcast spawning minnow: speckled chub (Macrhybopsis aestivalis)

Cited by 10 publications

References 74 publications

The emblematic minnows of the North American Great Plains: A synthesis of threats and conservation opportunities

The emblematic minnows of the North American Great Plains: A synthesis of threats and conservation opportunities

Aquatic food‐web structure along a salinized dryland river

Extreme drought causes fish recruitment failure in a fragmented Great Plains riverscape

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