Reproductive ecology of a critically endangered alpine galaxiid

Allan, Hugh; Duncan, Richard P.; Unmack, Peter J.; White, Duanne; Lintermans, Mark

doi:10.1111/jfb.14603

Cited by 3 publications

(3 citation statements)

References 68 publications

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“…1) is presumed to have been formerly distributed throughout Tantangara Creek, and further across parts of Australia's alpine country, including stretches of the Murrumbidgee River catchment (Raadik 2014; NSW FSC 2016; Allan & Lintermans 2018; Allan et al . 2021) (Fig. 2).…”

Section: Species Profilementioning

confidence: 97%

“…Fecundity is low (200–800 eggs per season) and spawning occurs in late spring (November–December) (Allan et al . 2021). Lifespan is unknown but likely <6–10 years based on observed size‐age classes in the wild, and knowledge of closely related species.…”

Section: Species Profilementioning

confidence: 99%

“…Annual monitoring of age/length cohorts should be timed in the months of late February or March when there is opportunity to detect both adults and juveniles from the most recent annual spawning event in November (Allan et al . 2021).…”

Section: Monitoring Stocky Galaxias Abundance Distribution and Threatsmentioning

confidence: 99%

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Monitoring populations and threats to range‐restricted freshwater fishes: A case study of the Stocky Galaxias (Galaxias tantangara)

Lavery¹,

Lindenmayer²,

Allan³

et al. 2022

Eco Management Restoration

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Monitoring is critical for conservation, to track the status of threatened species, assess the relative impacts of threats, inform management responses and prioritise them according to their efficacy. Globally, freshwater fish are impacted by a range of threats including deterioration in water quality, climate change, habitat loss and degradation, introduced predators and herbivores, and wildfire. Monitoring of freshwater fish can be challenging because aquatic conditions can make detecting and identifying population trends difficult for many species. Galaxiidae is the most speciose family of Gondwanandistributed freshwater fishes, and over 75% of species assessed by the IUCN Red List have been classified as threatened. Many Australian galaxiids are highly imperilled and monitoring effort and adequacy is low. We prepared a detailed monitoring plan for the Stocky Galaxias (Galaxias tantangara) that is representative of the conservation status and level of threat facing many congeneric and other similar species. Our protocol provides details of species biology, pertinent threats, and management options with sampling methods to gather these data, and options to link with management actions for maximum benefit. Improved monitoring linked with threat management should improve the conservation status of Stocky Galaxias. By providing this example, we have sought to improve monitoring for range-restricted freshwater fishes more generally.

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Section: Species Profilementioning

confidence: 97%

Section: Species Profilementioning

confidence: 99%

See 1 more Smart Citation

Monitoring populations and threats to range‐restricted freshwater fishes: A case study of the Stocky Galaxias (Galaxias tantangara)

Lavery¹,

Lindenmayer²,

Allan³

et al. 2022

Eco Management Restoration

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PIT POP! Bursting the bubble on home-range bias with fine-scale PIT telemetry

et al. 2022

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Context. Improved tracking technologies increase understanding of fish movement, but care is required when comparing studies of different design. Aims. We used an approach that allowed fine-scale tracking to compare results from individual-tracking designs to simulated batchmarking designs. Methods. Adult Galaxias tantangara (a small freshwater fish) individuals were tagged with 9-mm PIT tags in a small headwater stream and tracked with an accuracy of 1 lineal metre. To evaluate differences between common study designs, data were re-analysed to simulate both batch-marking section size and tracking resolution between 1 and 250 m. Key results. Homerange estimates decreased with a smaller section size and tracking resolution. Batch-marking simulations differed in 99% of cases, whereas individual tracking simulations differed in only 17% of comparisons. Comparisons between different methods were rarely statistically equivalent, being so only when section size or resolution was less than 4 m. Implications. Importantly, batch-marking studies are often likely to overestimate home-range size, and results from different studies may be comparable only when resolution is very fine or identical, even if the same method was used.

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Contrasting Patterns of Larval Recruitment in River–Lake Systems in Migratory and Nonmigratory Galaxias Species

Toorchi,

Reid,

Closs

2024

Ecology of Freshwater Fish

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Many aspects of the ecology, life history and distribution of fishes differ between their larval and adult life‐history stages. Identifying the critical habitats and migration pathways required by each life cycle stage is crucial for effective conservation and ecological management. Using microchemical analysis of otoliths, we examined the influence of larval habitat and migration on the composition and population structure of migratory and nonmigratory Galaxias species collected from tributaries upstream of inland lakes and streams lacking downstream lake connections in the Waitaki River basin, New Zealand. Larval (core) and adult (edge) layers of each individual otolith were analysed to compare otolith trace signatures formed during larval and adult life‐history stages. The results revealed considerable variation between larval and adult otolith chemical signatures of migratory (Galaxias brevipinnis) species. Classification analysis indicated that populations of G. brevipinnis upstream of each lake shared a common larval habitat, most likely the lake, with 100% of individuals from each lake‐riverine system having larval signatures that were distinct from adult signatures. In contrast, relatively consistent patterns of elemental concentrations were detected across the otoliths of nonmigratory species suggesting both their larval and adult life‐history stages had occurred in the same stream from which the adults were collected. These findings provide a framework for understanding how larval‐rearing environments can influence the distribution of stream fish across the landscape. Furthermore, identifying the source of recruits can help to improve conservation efforts to protect naturally land‐locked populations of G. brevipinnis.

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Reproductive ecology of a critically endangered alpine galaxiid

Cited by 3 publications

References 68 publications

Monitoring populations and threats to range‐restricted freshwater fishes: A case study of the Stocky Galaxias (Galaxias tantangara)

Monitoring populations and threats to range‐restricted freshwater fishes: A case study of the Stocky Galaxias (Galaxias tantangara)

PIT POP! Bursting the bubble on home-range bias with fine-scale PIT telemetry

Contrasting Patterns of Larval Recruitment in River–Lake Systems in Migratory and Nonmigratory Galaxias Species

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