Reproductive biology of the endangered Oxleyan pygmy perch <i>Nannoperca oxleyana</i> Whitley

Knight, James T.; Butler, Gavin L.; Smith, Pamela S.; Wager, R.

doi:10.1111/j.1095-8649.2007.01613.x

Cited by 19 publications

(40 citation statements)

References 17 publications

(38 reference statements)

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“…Knight & Trnski breeding in captivity (Llewellyn 1974;Wager 1992;Briggs 1999;Knight et al 2007), and population genetics (Hughes et al 1999;Hammer 2001;Knight et al 2009), there remains a lack of research into their early life histories. Studies of the eggs and larvae of pygmy perch are restricted to incomplete descriptions for N. vittata (Shipway 1949;Morgan and Beatty 2000) and N. australis (Llewellyn 1974), and a more comprehensive analysis of the larval development and diet of N. balstoni (Gill and Morgan 1998).…”

Section: Australian Zoologist Volume 35 (3)mentioning

confidence: 99%

“…This species obtains a length of approximately 60 mm, is a microphagic carnivore, and inhabits shallow, swampy regions of dystrophic, acidic streams, lakes and swamps within coastal 'wallum' (Banksia dominated heath) ecosystems (Kuiter et al 1996;Knight 2000;Pusey et al 2004;Knight and Arthington 2008). Protracted serial spawning occurs during the warmer months of the year between September and May when mean day length and water temperature reach and exceed 10.7 hours and 16.6° C, respectively (Knight et al 2007). Despite a lack of research into the species' early life history, aquarium enthusiasts have reported eggs hatching in one to four days at temperatures greater than 20° C (Leggett and Merrick 1987;Wager 1992).…”

Section: Australian Zoologist Volume 35 (3)mentioning

confidence: 99%

“…Adults were fed frozen bloodworms, live Artemia and mosquito wrigglers and spawned within acrylic spawning mops. Water quality, photoperiod (12 h light: 12 h dark) and water temperature (25 ± 1° C) for rearing eggs and larvae described in this study were based on average conditions experienced by wild populations in northern NSW during the spring/ summer spawning period (Knight et al 2007). …”

Section: Animal Husbandrymentioning

confidence: 99%

“…Techniques for breeding N. oxleyana are outlined in Knight et al (2007). Briefly, broodstock were sourced from North Stradbroke Island, Qld.…”

Section: Animal Husbandrymentioning

confidence: 99%

“…Although a number of studies have examined various aspects of the biology of pygmy perch, for example, habitat associations (Bond and Lake 2003;Knight and Arthington 2008), reproduction (Humphries 1995;Knight et al 2007), diet and growth (Pen and Potter 1991;Morgan et al 1995;Arthington 1996),…”

Section: Introductionmentioning

confidence: 99%

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Early development of the endangered Oxleyan pygmy perchNannoperca oxleyanaWhitley (Percichthyidae)

Knight¹,

Trnski²

2011

Australian Zoologist

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The developmental ontogeny and morphology of the eggs, larvae and early juveniles of the endangered Nannoperca oxleyana is described based on collections of preserved wild fish, and preserved and live captive specimens reared at 25 ± 1º C. Eggs are telolecithal, spherical, average 1.02 ± 0.004 (± S.E.) mm in diameter, have a smooth, slightly adhesive chorion without filaments, a translucent homogeneous yolk, display meroblastic cell division and follow the general pattern of teleost embryogenesis. Early, middle and late stages of embryonic development were completed on average at 16, 28 and 50 hours post fertilisation. The larvae have generalised perciform morphological development with no apparent larval specialisations. The body is moderately deep bodied and compressed laterally. Head spination is limited to the development of an opercular spine in postflexion larvae. Pigmentation is relatively heavy and uniform over the head and body. Large melanophores occur on the dorsal, lateral and ventral midlines. Squamation commenced in postflexion larvae from 7.5 mm preserved body length (BL) and was complete in all specimens greater than 10.3 mm. Live captive, translucent larvae become pale green within two days of hatching and then light brown during the preflexion and postflexion stages. Juveniles are typically light brown laterally, darker dorsally and have a silvery-white belly. Growth of live, captive larvae and juveniles up to 6-months post hatching was described by the equation: Log 10 live BL = 0.6043 + 0.0042A (r 2 = 0.917, P<0.001, n = 323). Ranges for body length and age (days post hatch) of live captive fish were: preflexion 2.80-6.70 mm, 0-40 days; flexion: 6.35-7.70 mm, 21-61 days; postflexion: 6.40-10.30 mm, 43-118 days; and juveniles: 9.60-20.60 mm, 70-188 days. Live captive larvae commenced exogenous feeding at five days post hatching. Comparisons of N. oxleyana early developmental ontogeny and morphology are made with related percichthyids and sympatric species and implications for the conservation of the species are discussed.

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Section: Australian Zoologist Volume 35 (3)mentioning

confidence: 99%

Section: Australian Zoologist Volume 35 (3)mentioning

confidence: 99%

Section: Animal Husbandrymentioning

confidence: 99%

“…Techniques for breeding N. oxleyana are outlined in Knight et al (2007). Briefly, broodstock were sourced from North Stradbroke Island, Qld.…”

Section: Animal Husbandrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Early development of the endangered Oxleyan pygmy perchNannoperca oxleyanaWhitley (Percichthyidae)

Knight¹,

Trnski²

2011

Australian Zoologist

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Naturally acidic waterways: conceptual food webs for better management and understanding of ecological functioning

Holland

Duivenvoorden

Kinnear

2012

Aquatic Conservation

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Naturally acidic fresh waters have high conservation value, with their habitats supporting a high level of biodiversity as well as providing for rare organisms that are specially adapted to life in low‐pH environments. Food webs within naturally acidic waterways are heavily reliant on the input of large amounts of organic matter from the surrounding terrestrial environment. Although these systems are found worldwide, the increasing threats of global climate change and urban developments are placing naturally acidic environments under threat of catastrophic changes to their ecology. Despite this, studies of these unique systems remain in their infancy, especially when compared with systems acidified by anthropogenic means. This paper aims to explore the varying influences on key food‐web elements in naturally acidic waterways, particularly with regard to allochthonous organic matter (AOM). A conceptual model for the food webs of naturally acidic environments is presented, with the aim of providing a framework to understand the ecological functioning of these under‐studied systems. This information will be critical in informing management decisions as naturally acidic streams are challenged by increasing environmental pressures. The possibility that dissolved organic carbon (DOC) can buffer organisms in naturally acidic environments against the toxicity caused by low pH is also explored. Copyright © 2012 John Wiley & Sons, Ltd.

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Mesohabitat associations of the threatened San Marcos salamander (Eurycea nana) across its geographic range

Diaz

Fries

Bonner

et al. 2015

Aquatic Conservation

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Habitat loss is one of the most critical factors affecting the loss of species. However, habitat conservation of many threatened species is performed with incomplete information on habitat requirements and trophic ecology, thus presenting a challenge to designing and implementing recovery plans. The San Marcos salamander (Eurycea nana) is a federally threatened spring‐associated organism whose geographic distribution is limited to the headwaters of the San Marcos River in Texas, USA. Although its designated critical habitat includes the headwaters and the first 50 m of the river, little is known of its habitat requirements or co‐occurrence with benthic macroinvertebrates and macrophytes. This study examined mesohabitat associations of the salamander and patterns of co‐occurrence with macrophytes and benthic invertebrates within its critical habitat. Surveys of mesohabitat characteristics were conducted during a one‐year period and data were analysed to assess mesohabitat associations of the San Marcos salamander and patterns of co‐occurrence with invertebrates and macrophytes. Salamanders were distributed throughout the critical habitat, but were almost exclusively found in mesohabitats containing cobble and gravel with coverage of Amblystegium and filamentous algae. The salamander did not exhibit consistent co‐occurrence with specific invertebrates or macrophytes across the critical habitat, indicating that salamanders were probably selecting mesohabitats based on benthic substrate and not the biotic communities. Protection of a specific mesohabitat type within the critical habitat of the San Marcos salamander is likely to be one of the most important conservation measures, given that it accounts for ~7% of the total area within the designated critical habitat. These results also emphasize that habitat conservation plans for species at risk should consider that contemporary spatial distribution of species within habitats may be influenced not only by their evolutionary history but also by past and current human pressures. Copyright © 2015 John Wiley & Sons, Ltd.

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Reproductive biology of the endangered Oxleyan pygmy perch Nannoperca oxleyana Whitley

Cited by 19 publications

References 17 publications

Early development of the endangered Oxleyan pygmy perchNannoperca oxleyanaWhitley (Percichthyidae)

Early development of the endangered Oxleyan pygmy perchNannoperca oxleyanaWhitley (Percichthyidae)

Naturally acidic waterways: conceptual food webs for better management and understanding of ecological functioning

Mesohabitat associations of the threatened San Marcos salamander (Eurycea nana) across its geographic range

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