Quantifying Rarity, Losses, and Risks for Native Fishes of the Lower Colorado River Basin: Implications for Conservation Listing

Fagan, William F.; Kennedy, Christina M.; Unmack, Peter J.

doi:10.1111/j.1523-1739.2005.00215.x

Cited by 24 publications

(32 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, although movement was a possibility for all species present in the catchment (Fagan et al 2005), only spangled perch, bony bream, rainbowfish and glassfish were always found at the upstream sites, with silver tandan also occasionally present. We therefore suggest that these common and widespread species are the most likely to move the furthest during sporadic flooding in central Australia.…”

Section: Discussionmentioning

confidence: 96%

Fish movement strategies in an ephemeral river in the Simpson Desert, Australia

Kerezsy¹,

Balcombe²,

Tischler

et al. 2013

Austral Ecology

View full text Add to dashboard Cite

Arid zone catchments experience extreme hydrological variability and some rivers are entirely ephemeral, replenished only by intermittent flooding. The ecological roles of ephemeral systems are rarely studied. This paper describes movement patterns of fish in the Mulligan River, an ephemeral system in the Lake Eyre Basin, central Australia. Several sites were sampled along a temporal gradient encompassing floods and dry periods. After a single major flood in 2007 up to seven fish species were found at sites up to 300 km from the closest permanent waterhole. Following a series of floods (when waterholes were replenished and remained wet between 2009 and 2011) a further five species were recorded including the first records for the Lake Eyre hardyhead, Craterocephalus eyresii, from the rivers of far western Queensland.The presence of all species known from the parent catchment (the Georgina, where permanent waterholes occur) in the ephemeral catchment (the Mulligan) suggests that many fish species present in the river systems of central Australia are capable of dispersing long distances following the opening of movement pathways during flooding. However, two distinct groups of species were identified: extreme dispersing species, that move as far as possible into intermittently wetted habitats, and conservative dispersing species, that do not move as far, tending to inhabit deeper waterholes within mid-reaches of the river that are more likely to hold water for longer. Preservation of the natural flow regime of Australia's arid-zone rivers is important for maintaining these fish communities and facilitating study of their adaptations to ephemerality.

show abstract

Section: Discussionmentioning

confidence: 96%

Fish movement strategies in an ephemeral river in the Simpson Desert, Australia

Kerezsy¹,

Balcombe²,

Tischler

et al. 2013

Austral Ecology

View full text Add to dashboard Cite

show abstract

“…Seven cyprinids in our study are endangered, four are threatened, one is of special concern and two are candidates for listing by the Endangered Species Act. On average, the range size of cyprinids has declined by greater than 30% since the 1950s (range: 214 to 100%; [20]), such that average occupancy for cyprinid species is just 15.4 km 2 in the basin [58]. Second, environmental conditions were already dramatically changed prior to the contemporary time period ( post-1980) used to characterize the fish communities, such that closely related species that may once have been locally adapted are no longer at an advantage.…”

Section: Discussionmentioning

confidence: 99%

Fish species introductions provide novel insights into the patterns and drivers of phylogenetic structure in freshwaters

Strecker

Olden

2014

Proc. R. Soc. B.

View full text Add to dashboard Cite

Despite long-standing interest of terrestrial ecologists, freshwater ecosystems are a fertile, yet unappreciated, testing ground for applying community phylogenetics to uncover mechanisms of species assembly. We quantify phylogenetic clustering and overdispersion of native and non-native fishes of a large river basin in the American Southwest to test for the mechanisms (environmental filtering versus competitive exclusion) and spatial scales influencing community structure. Contrary to expectations, non-native species were phylogenetically clustered and related to natural environmental conditions, whereas native species were not phylogenetically structured, likely reflecting human-related changes to the basin. The species that are most invasive (in terms of ecological impacts) tended to be the most phylogenetically divergent from natives across watersheds, but not within watersheds, supporting the hypothesis that Darwin's naturalization conundrum is driven by the spatial scale. Phylogenetic distinctiveness may facilitate non-native establishment at regional scales, but environmental filtering restricts local membership to closely related species with physiological tolerances for current environments. By contrast, native species may have been phylogenetically clustered in historical times, but species loss from contemporary populations by anthropogenic activities has likely shaped the phylogenetic signal. Our study implies that fundamental mechanisms of community assembly have changed, with fundamental consequences for the biogeography of both native and non-native species.

show abstract

“…However, during our researches, it was stated that not every species, no matter what category of extinction it belongs and the height of the extinction risk that category bears at the national and/or global level, is threatened Table 9 The relation between the global and national status of endangerment, the level of extinction risk, and the protection priorities of the aquatic species by the same and/or equal to that category, a danger of extinction in every habitat or the whole area it lives in. The problem of the assessment of the extinction risk of the endangered species is approached in different ways and among the ones that are more or less similar to our researches the results Fagan et al (2005) can be isolated. The author, as the base for the assessment of the risk use the data base (SONFISHES) with the qualitative and quantitative data of the ichthyofauna of the basin area of the Colorado river (U.S.A.) during the historically long (traditional) period of time as well as so called ''modern '' period, that is 1981-1998.…”

Section: Discussionmentioning

confidence: 88%

Model of the assessment of the critical risk of extinction and the priorities of protection of endangered aquatic species at the national level

Simić

Paunović³

et al. 2007

Biodivers Conserv

View full text Add to dashboard Cite

In the period 1995-2006, the biodiversity of the aquatic habitats in the area of Serbia was explored, with the aim to identify the endangered species of macroalgae, macroinvertebratae and fishes. During the work a data base was formed (Aquatic Ecosystems Diversity in Serbia, AEDSer), containing the data from exploring the biodiversity of the aquatic ecosystems of Serbia since 1860. Based on the data base, classification of the aquatic species was made into categories of endangerment based on IUCN criteria. The following was noted: (1) the global IUCN category assigned to the species often is not identical with the national status of endangerment; and (2) the species that are given a category of endangerment at the national level do not have the same realistic risk of extinction in all their habitats. This remark imposed the need for a model for assessing the critical risk of extinction of the endangered species and determining the priorities of their protection at the national level. Two categories of characters were used to develop the model: the characters that determine the degree of ecological specialisation of the species based on the circumstances of habitat; and the characters suggesting the risk factors from the system: ''HIPPO'' in the spatial and time dimension. The possibility to apply the model was tested on 10 aquatic species belonging to different categories of endangerment at the national level (macroalgae 2, macroinvertebrates 7, and fishes 1 species). The model based on points determined the level of extinction risk and, that way, the species needing urgent conservation from the same or different categories of endangerment were isolated. The model suggested can contribute to a more efficient defining the conservation priorities.

show abstract

Quantifying Rarity, Losses, and Risks for Native Fishes of the Lower Colorado River Basin: Implications for Conservation Listing

Cited by 24 publications

References 42 publications

Fish movement strategies in an ephemeral river in the Simpson Desert, Australia

Fish movement strategies in an ephemeral river in the Simpson Desert, Australia

Fish species introductions provide novel insights into the patterns and drivers of phylogenetic structure in freshwaters

Model of the assessment of the critical risk of extinction and the priorities of protection of endangered aquatic species at the national level

Contact Info

Product

Resources

About