Desiccation resistance explains amphibian distributions in a fragmented tropical forest landscape

Watling, James I.; Braga, Lorenzo

doi:10.1007/s10980-015-0198-0

Cited by 54 publications

(54 citation statements)

References 62 publications

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“…In the areas studied, I. henselii is not an abundant species when compared to other sympatric species (Lucas & Marocco 2011;Bastiani & Lucas, 2013), and the area of occupancy is always associated with wetlands inside the forest. The habitat loss and modification cause microclimatic and spatial configuration changes, such as edge effect and reduction in litter humidity, essential for larval development and permanence of amphibians with direct development of terrestrial eggs (Watling & Braga, 2015;Da Silva et al, 2013). Thus, forest fragmentation in this region could eliminate or isolate populations of I. henselii, leading to a regional extinction of the species in the future, mainly in dry fragments.…”

Section: Discussionmentioning

confidence: 99%

Geographic distribution, habitat use and vocalizations of the leaf-litter frog Ischnocnema henselii (Anura: Brachycephalidae) in the subtropical Atlantic Forest

Lucas

Bastiani

Lingnau

2018

Rev. Bras. Zoociências

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Data on geographic distribution and ecology are essential when defining the conservation status of a species. Herein, we present new information about the geographic distribution, habitat and advertisement call of Ischnocnema henselii, an endemic species of the southern Atlantic Forest. We conducted this study in forest fragments in the state of Santa Catarina, Southern Brazil, from January 2008 to November 2012. We recorded I. henselii in eight fragments over 100 ha in size, both inside and outside conservation units. We often observed less than 20 males in calling activity. The calling activity was daytime and nighttime, and more intense in the rain. We observed individuals perched on vegetation, on leaves or branches, on the leaf litter or under tree trunks. Duration of advertisement calls ranged from 14.71 ± 1.68 s (n = 11 calls) and interval between notes was 0.22 ± 0.13 s (n = 99 notes). We observed that the advertisement calls had a feature that we call "alternating modulation" in the amplitude of the notes. We suggest that further bioacoustic studies should analyze the relevance of this alternating modulation, to understand its role in communication. Although I. henselii is a habitat specialist, it is currently considered a common species, classified as Least Concern by Brazilian and IUCN lists. In the region studied, characterized by small and isolated remnants of the Atlantic Forest, I. henselii is not an abundant species and its spatial distribution is always associated with wet forest fragments. The increasing degradation of forest remnants in this region causes microclimatic and structural changes that may compromise the permanence of strictly forest and moisture-dependent species for reproduction, such as I. henselii. Resumo. Distribuição geográfica, uso do habitat e vocalizações da rãzinha-de-folhiço Ischnocnema henselii(Anura: Brachycephalidae) na Mata Atlântica subtropical. Informações sobre distribuição geográfica e ecologia são essenciais para a definição do estado de conservação de uma espécie. Aqui, nós apresentamos novas informações sobre a distribuição geográfica, habitat e canto de anúncio de I. henselii, um anfíbio endêmico do Sul da Mata Atlântica. Nós conduzimos o estudo em fragmentos florestais no estado de Santa Catarina, sul

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Section: Discussionmentioning

confidence: 99%

Geographic distribution, habitat use and vocalizations of the leaf-litter frog Ischnocnema henselii (Anura: Brachycephalidae) in the subtropical Atlantic Forest

Lucas

Bastiani

Lingnau

2018

Rev. Bras. Zoociências

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“…This has been observed for other frog species (e. g. Lithobates catesbeianus ; [15]), with individuals decreasing their VT Max in response to dehydration, and some even losing their behavioral response to VT Max . Even though we controlled for hydration when measuring VT Max , individuals in the wild rarely are at their optimal hydration level and thus desiccation might influence local frog distribution [64]. Desiccation has been shown to be correlated with substrate use [65] and with dispersal probability throughout the landscape [64].…”

Section: Discussionmentioning

confidence: 99%

“…Even though we controlled for hydration when measuring VT Max , individuals in the wild rarely are at their optimal hydration level and thus desiccation might influence local frog distribution [64]. Desiccation has been shown to be correlated with substrate use [65] and with dispersal probability throughout the landscape [64]. Additionally, closely-related frog species may vary in their response to desiccation along thermal gradients, with some species showing greater resistance to water loss at lower temperatures, and others at higher temperatures [66].…”

Section: Discussionmentioning

confidence: 99%

“…Additionally, closely-related frog species may vary in their response to desiccation along thermal gradients, with some species showing greater resistance to water loss at lower temperatures, and others at higher temperatures [66]. Therefore, knowing the interaction between VT Max and hydration state of individuals in their environments can help to understand patterns and/or limits in their distribution [64, 67–69].…”

Section: Discussionmentioning

confidence: 99%

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Behavioral thermal tolerance predicts distribution pattern but not habitat use in sympatric Neotropical frogs

Díaz‐Ricaurte

Serrano²,

Guevara-Molina

et al. 2020

Preprint

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23Environmental temperatures are a major constraint on ectotherm abundance and 24 diversity, influencing their distribution and natural history. Comparing thermal 25 tolerances with environmental temperatures is a simple way to estimate thermal 26 constraints on species distributions. We investigate the potential effects of thermal 27 tolerance on anuran local (habitat) and global distribution patterns and associated 28 behavioral responses. We tested for differences in Voluntary Thermal Maximum of two 29 sympatric frog species of the genus Physalaemus in the Cerrado ecoregion. For each 30 species, we constructed models to assess the effects of period of day, duration of 31 experiment, initial body mass, initial body temperature and heating rate on the VT Max . 32We mapped the difference between VT Max and maximum daily temperature (VT Max -33 ET Max ) for each occurrence point. Physalaemus nattereri had a significantly higher 34 VT Max than P. cuvieri. For P. nattereri, the model including only period of day was 35 chosen as the best to explain variation in the VT Max . For P. cuvieri, no model was 36 selected as best to predict VT Max . The VT Max -ET Max values were significantly different 37 between species, with P. nattereri mostly found in localities that attain maximum 38 temperatures lower than its VT Max and P. cuvieri showing the reverse pattern. Regarding 39 habitat use, we found P. cuvieri to be slightly more abundant in open habitats than in 40 non-open habitats, whereas P. nattereri shows the reverse pattern. The difference in 41 VT Max values between these two species might be related to their different body sizes, 42 but additionally might reflect their natural history, especially the way they use their 43 habitats, and phylogenetic constraints (the species studied are in different clades within 44 Physalaemus). Our study indicates that differences in behavioral thermal tolerance may 45 be important in shaping local and regional distribution patterns. Furthermore, small-46 3 scale habitat use might reveal a link between behavioral thermal tolerance and natural 47 history strategies. 48 49 50 Environmental temperatures are a major constraint on ectotherm abundance and 51 diversity, influencing their distribution and natural history [1, 2, 3]. Several studies have 52 explored environmental constraints on ectothermic vertebrates at regional and global 53 scale [4, 5, 6]. The physiological performance of individuals can be negatively affected 54 by high environmental temperatures [7], which can lead to declining populations and/or 55 local extinctions [3]. Thus, knowing species thermal tolerance and exploring how 56 environmental temperatures might affect their physiology and restrict their distribution 57is of primary concern for long-term conservation, especially under a global warming 58 trend (e.g. [8]). 59Many studies infer potential distribution of species using solely environmental 60 temperatures from occurrence localities to model their potential niche (e.g. [9-10]). 61However, incorporati...

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“…However, to be sustained for 70 years (2015–2085) would still require the taxa to shift the leading edge of their distribution between 140 and 210 km. This rate of dispersal also assumes shifts are maintained despite differences in landscape permeability and artificial barriers (Watling & Braga, ), information that could be easily incorporated into the dispersal‐network model, but represented further assumptions beyond the scope of this study. As a result, there are potentially many taxa with low mobility that are likely to face severe declines due to climate change.…”

Section: Discussionmentioning

confidence: 99%

Does dispersal capacity matter for freshwater biodiversity under climate change?

Буш

Hoskins

2016

Freshwater Biology

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Summary Freshwater ecosystems appear to be sensitive to even minor climatic shifts, and the dendritic nature of rivers as well as patchy distribution of habitats within the terrestrial landscape could limit the ability of species to track suitable climate conditions. Although the importance of dispersal is recognised in theory, there is great uncertainty when quantifying the capacity of species to shift their distributions in response to climate change. The influence of dispersal capacity on species’ vulnerability to climate change was assessed, using the modelled projections of 527 freshwater species in New South Wales (NSW), Australia. Species’ future ranges were calculated by iteratively identifying colonisation of accessible habitats and loss of suitable habitats within network models. The accessibility of new habitats was based on a given dispersal mode (aquatic, semi‐terrestrial and aerial). The relative impact of dispersal parameters on projected range were evaluated alongside other known sources of uncertainty (climate and emissions scenarios, modelling algorithm and biological group), analysed collectively in a generalised additive mixed‐model, and spatially to locate regions of NSW where projections are associated with the most uncertainty. Our simulations (1.4 million scenario combinations) suggest at least a third of species will lose more than half their range under climate change. Nevertheless, we emphasise the broad uncertainty that any average encapsulates. Dispersal capacity only had a minor impact on projected range shifts relative to other modelling assumptions but the network‐pathways and maps of uncertainty have value for conservation planning at large scales. Projected range losses initially decreased rapidly as dispersal rates increased but the benefits are reduced above 2–3 km year−1. Taxa restricted to dispersal within the stream network (aquatic) were more vulnerable to climate change than taxa with semi‐terrestrial or aerial dispersal and maps of variation due to dispersal mode and rate indicate where habitat connectivity would be most beneficial. This study demonstrates the breadth of uncertainties that challenge plans for improving ecosystem adaptation under climate change and highlights where in the landscape those differences were consistent. We emphasise the need for freshwater conservation studies to be ecologically representative, to focus on broad‐scale connectivity for taxa that can move between catchments, and an accessible network of refugia for taxa with more limited dispersal.

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Desiccation resistance explains amphibian distributions in a fragmented tropical forest landscape

Cited by 54 publications

References 62 publications

Geographic distribution, habitat use and vocalizations of the leaf-litter frog Ischnocnema henselii (Anura: Brachycephalidae) in the subtropical Atlantic Forest

Geographic distribution, habitat use and vocalizations of the leaf-litter frog Ischnocnema henselii (Anura: Brachycephalidae) in the subtropical Atlantic Forest

Behavioral thermal tolerance predicts distribution pattern but not habitat use in sympatric Neotropical frogs

Does dispersal capacity matter for freshwater biodiversity under climate change?

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