Influence of priority effects and pond location on invaded larval amphibian communities

Knight, Carol; Parris, Matthew J.; Gutzke, William H. N.

doi:10.1007/s10530-008-9314-2

Cited by 23 publications

(13 citation statements)

References 46 publications

(57 reference statements)

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“…These findings contrasted our results, which indicated that Bufo did best (survival, larval period) when introduced early. However, results similar to ours have been reported by Crossland et al (2009) for cane toads (B. marinus, 100/m 3 ), and by Knight et al (2009) for southern toads (B. terrestris, 10-20/m 3 ). The Bufo mass response in our study may have been affected by the substantially greater survival of tadpoles that were introduced early, which could have depressed mass at metamorphosis through greater intraspecific competition.…”

Section: Discussionsupporting

confidence: 92%

“…Boone et al (2002) found that time of hatching of marbled salamanders influenced whether or not they were competitors or predators of mole salamanders; whether or not marbled salamander larvae gained a growth advantage over mole salamander larvae varied among years depending on time of pond filling and egg nest position within the habitat. Knight et al (2009) showed that colonization history and pond location (full sun or shaded) governed whether invasive exotic treefrog tadpoles could preclude native tadpoles from reaching metamorphosis. Heterospecifics may also be competitors or intra-guild predators, depending either on when they colonize the system Margalit 1994, 1996;Sours and Petranka 2007) or on which species are present (Wilbur 1972).…”

Section: Introductionmentioning

confidence: 99%

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Insecticide has asymmetric effects on two tadpole species despite priority effects

Distel

Boone

2011

Ecotoxicology

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Priority effects are defined as asymmetric responses of different species colonizing the same habitat in different sequences and are important in structuring communities, particularly for ephemeral systems that are colonized annually. Amphibians often use ephemeral ponds and have been shown to experience priority effects from interspecific competition. Pesticide exposure can impact amphibian species interactions like competition, and has been linked to declines. We investigated whether insecticide exposure interacted with colonization history to impact priority effects in Bufo americanus and Rana pipiens. We predicted that exposure to the insecticide carbaryl and colonization history would affect tadpole metamorphosis independently and interactively. Our results indicated that Bufo time to metamorphosis experienced priority effects: Bufo introduced early reached metamorphosis sooner when Rana were absent, but Bufo introduced late reached metamorphosis sooner when Rana were also late. Insecticide exposure eliminated differences in Bufo time to metamorphosis due to Rana colonization history. Rana survival and mass at metamorphosis were affected by intraspecific colonization history. Bufo had significantly fewer survivors and Rana had more survivors in insecticide-exposed treatments. Bufo did better when reared without Rana, but Rana was unaffected by Bufo presence. The effects on anuran metamorphosis occurred without any effects on periphyton abundance. We suggest that the effects of insecticide exposure on amphibian metamorphosis are not related to colonization history, although each factor alone can have substantial impacts. These results preliminarily suggest that managing pesticide applications with sensitivity to amphibians may be less complex than implied by traditional food web theory, although more research is needed.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Insecticide has asymmetric effects on two tadpole species despite priority effects

Distel

Boone

2011

Ecotoxicology

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“…Alford 1999), several studies have evaluated the possible impact of competition from non-native tadpoles on native tadpoles (Kupferberg 1997;Crossland 1998;Kiesecker and Blaustein 1998;Smith 2005;Knight et al 2009;Crossland and Shine 2010;Rebelo et al 2010) and their effects on community structure; although only a few of these studies were carried out on arid or Mediterranean amphibian communities (Woodward 1982;RichterBoix et al 2007a;Escoriza and Boix 2012). The competitiveness of the different species can be quantified using tadpole performance measures such as larval period, size at metamorphosis and mortality.…”

Section: Introductionmentioning

confidence: 99%

Effects of the non-native amphibian species Discoglossus pictus on the recipient amphibian community: niche overlap, competition and community organization

et al. 2012

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The painted frog, Discoglossus pictus, was introduced into the Iberian Peninsula 100 years ago and its distribution has steadily increased since then. We studied the effects of this non-native amphibian species on the native ones in the northeastern area of the peninsula. We compared amphibian assemblages in regions with and without D. pictus to estimate niche overlap between species. Additionally, we carried out a laboratory evaluation of the effects of competition between the non-native and the two native species with which it overlaps most commonly: Bufo calamita and Pelodytes punctatus. The presence of D. pictus larvae reduced the survival, body mass and activity of B. calamita, and increased time to metamorphosis. Furthermore, D. pictus showed the highest consumption rate while P. punctatus showed the lowest. One possible consequence of these competitive interactions is an alteration of species co-occurrence patterns in the recipient community on a regional scale. In the non-invaded area, the checkerboard score (C-score) of co-occurrence indicated that the community was structured, whereas the standardized C-score in the invaded area indicated that the community did not differ significantly from having a random structure. These results suggest that competition between native and non-native species can cause recipient communities to become less structured.

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“…Wilbur 1977;Katzmann et al 2003;Richter-Boix et al 2007), mediated not only by direct reduction in per-capita food availability (Steinwascher 1979;Dash and Hota 1980), but also via more subtle means such as response to chemical substances produced by developing larvae (Rose 1960;Licht 1967;Beebee 1991). A range of life-history shifts has been documented in response to such competitive forces, with the responses that we saw in Marbled Frogs (no change in tadpole survival, but production of small, late-emerging metamorphs) being a common outcome of larval competition between introduced and endemic larval anurans (Kupferberg 1997;Williamson 1999;Smith 2005;Knight et al 2009). …”

Section: Discussionmentioning

confidence: 85%

“…To avoid pseudoreplication, we used means of each container for duration of larval period and mass at metamorphosis in our statistical analyses. We used multivariate analysis of variance (MANOVA) to test for differences between groups raised with, versus without toad tadpoles present (see Morin 1983;Alford 1989;Knight et al 2009). Three dependent variables were used: proportion surviving to metamorphosis, duration of larval period and mass at metamorphosis.…”

Section: Measurements and Statistical Analysismentioning

confidence: 99%

Larval interactions with an invasive species (the Cane ToadRhinella marina) affect life-history traits in an Australian anuran (the Marbled FrogLimnodynastes convexiusculus)

Greenlees

Crossland

Shine

2013

Australian Zoologist

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The viability of a metamorph anuran can be influenced by its body size and the time it has taken to complete larval development. In a laboratory experiment, we show that the presence of tadpoles of the invasive Cane Toad Rhinella marina causes tadpoles of a native frog (Marbled Frog Limnodynastes convexiusculus) to metamorphose later and at smaller sizes. These effects may render frog metamorphs more vulnerable to desiccation and predation, but render them less vulnerable to Cane Toads. Marbled Frogs prey upon other anurans, including the highly toxic Cane Toad metamorphs. Small, late-emerging metamorph frogs are unlikely to encounter metamorph toads small enough to ingest; and hence, are less likely to be fatally poisoned by consuming the toxic invader. Developing in the presence of larval Cane Toads thus increases the native taxon's ability to survive the presence of toads postmetamorphosis. Predicting the ecological impacts of an invasive species on native taxa with biphasic life histories (such as most anurans) thus requires information on interactions in both aquatic and terrestrial environments. The expression of phenotypic plasticity in one phase may influence fitness in a subsequent phase, in complex and non-intuitive ways. (Tyler et al. 1983). Cane Toads and Marbled Frogs (Limnodynastes convexiusculus) often breed in the same ponds at the same time (Crossland et al. 2008). Collection, husbandry and experimental designWe collected 10 clutches of Marbled Frog eggs from a temporary pond (131°18'46.74" E, 12°34'15.33" S) on 27 February 2007, the morning after they were deposited. The clutches were taken to our research facility less than 5 km from the collection site, and all clutches hatched within three days. Frog eggs and tadpoles were housed in an opensided shed, initially in plastic containers (38 cm long x 26 cm wide x 20 cm high). Tadpoles were reared on a diet of frozen lettuce provided ad libitum. Water was partially changed twice weekly. On 23 May 2007, 10 tadpoles at stage 25 of development (Gosner 1960) were randomly selected from each clutch, and a tadpole from each clutch was added to each of 10 bins (60 cm long x 40 cm wide x 40 cm high, filled to 5cm below the rim; i.e. 10 tadpoles total per container). To half of these bins (randomly selected), we added 10 Cane Toad tadpoles between Gosner stages 26-30, collected from a pond 10 km away (131°18'57.07" E, 12°38'24.72" S). We used mid-stage toad tadpoles to minimise toxic effects, in case any toad tadpoles died and were consumed by frog tadpoles (Hayes et al. 2009). All containers contained frozen lettuce ad libitum as food, and water was partially changed weekly. Over the course of the experiment, water temperature ranged from 26 to 30°C. We did not include additional treatments of different densities of frog tadpoles because our aim was to simulate effects of toad invasion; at least initially, these anurans add to total anuran biomass rather than replacing native taxa (Greenlees et al. 2006(Greenlees et al. , 2007. Measurements an...

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Influence of priority effects and pond location on invaded larval amphibian communities

Cited by 23 publications

References 46 publications

Insecticide has asymmetric effects on two tadpole species despite priority effects

Insecticide has asymmetric effects on two tadpole species despite priority effects

Effects of the non-native amphibian species Discoglossus pictus on the recipient amphibian community: niche overlap, competition and community organization

Larval interactions with an invasive species (the Cane ToadRhinella marina) affect life-history traits in an Australian anuran (the Marbled FrogLimnodynastes convexiusculus)

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