Effects of Forest Fragmentation and Habitat Degradation on West African Leaf‐Litter Frogs

Hillers, Annika; Veith, Michael; Rödel, Mark‐Oliver

doi:10.1111/j.1523-1739.2008.00920.x

Cited by 73 publications

(72 citation statements)

References 35 publications

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“…From western Ivorian forests it has been shown that logging has a serious effect on the composition of frog assemblages. Many forest specialists seem to be unable to prevail in degraded forests, most probably due to an altered microclimate with which they cannot cope , Ernst and Rödel 2006, Hillers et al 2008. Hence, exploring more of the potentially pristine areas in the southern parts of TESF is needed to get a complete impression concerning the presumed original anuran composition in TESF.…”

Section: Discussionmentioning

confidence: 99%

“…The composition of amphibian assemblages thus may reflect the degree of habitat degradation and destruction (for Ivorian examples compare e.g. Ernst and Rödel 2005, Ernst et al 2006, Hillers et al 2008. Hence, conservation recommendations could be based on the presence or absence of particular amphibian species and their continued monitoring.…”

Section: Introductionmentioning

confidence: 99%

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The anuran fauna of a Volunteer Nature Reserve: the Tanoé-Ehy Swamp Forests, south-eastern Ivory Coast, West Africa

Kpan¹,

Adeba²,

Kouamé³

et al. 2014

ZSE

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The anuran fauna of a Volunteer Nature Reserve: the Tanoé-Ehy Swamp Forests, south-eastern Ivory Coast, West Africa

Kpan¹,

Adeba²,

Kouamé³

et al. 2014

ZSE

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show abstract

“…Amphibians, and especially frogs, are of interest in this context for two reasons: (1) the majority of species are dimorphic, with females typically being larger than males (Monnet and Cherry, 2002) and (2) amphibians are characterized by a low overall mobility, making them especially vulnerable to local habitat destruction and habitat fragmentation (Hillers et al, 2008). Thus, dispersal is likely under strong selection in fragmented habitats.…”

Section: Introductionmentioning

confidence: 99%

Sexual differences in exploration behavior inXenopus tropicalis?

Videlier¹,

Cornette²,

Bonneaud

et al. 2015

Journal of Experimental Biology

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The two sexes of a species often differ in many ways. How sexes differ depends on the selective context, with females often investing more in reproductive output and males in territory defense and resource acquisition. This also implies that behavioral strategies may differ between the two sexes, allowing them to optimize their fitness in a given ecological context. Here, we investigated whether males and females differ in their exploration behavior in an aquatic frog (Xenopus tropicalis). Moreover, we explored whether females show different behavioral strategies in the exploration of a novel environment as has been demonstrated previously for males of the same species. Our results show significant sex differences, with males exploring their environment more than females. Yet, similar to males, female exploratory behavior varied significantly among individuals and broadly fell into three categories: shy, intermediate and bold. Moreover, like in males, behavioral strategies are decoupled from morphology and performance. Our results suggest that females are more sedentary than males, with males engaging in greater risk taking by exploring novel environments more. Male and female behaviors could, however, be classified into similar groups, with some individuals being bolder than others and displaying more exploration behavior. The decoupling of morphology and performance from behavior appears to be a general feature in the species and may allow selection to act on both types of traits independently.

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“…Previous studies have showed synergies between extreme pH levels (Pahkala et al 2002) or depth of breeding ponds (Kiesecker et al 2001) and excessive ultraviolet exposure, and between the use of pesticides and the presence of predators (Relyea and Mills 2001). Additionally, habitat loss is a major driver of population declines (Beebee and Griffiths 2005, Cushman 2006, Halliday 2008, Hillers et al 2008, Angelone and Holderegger 2009, and the fungus, Batrachochytrium dendrobatidis, has been identified as cause of population declines and extinctions of many species worldwide (e.g., Rohr and Raffel 2010). On the other hand, the effects of climate as a direct driver of extinctions are less clear (e.g., Carey andAlexander 2003, Minter 2011).…”

Section: Introductionmentioning

confidence: 99%

Variable response of anuran calling activity to daily precipitation and temperature: implications for climate change

et al. 2013

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Abstract. Long-term monitoring of frog populations is needed to understand the effects of global change. To better understand the relationships between climate variation and calling activity, we monitored an anuran assemblage in a Puerto Rican wetland by sampling the acoustic environment for one minute every 10 minutes, for 41 months. By automating data collection using passive acoustic monitoring hardware, we collected more than 110,000 recordings. These recordings were analyzed using speciesspecific identification algorithms of four Eleutherodactylus species. The peak calling activity of E. coqui (.0.3 detection frequency) and E. cochranae (.0.2) occurred between April and September, and there was a clear decline in activity during the dry months of January-March. There was no clear annual pattern in E. brittoni or E. juanariveroi, but E. juanariveroi did show a significant decline in calling activity over the 41-month study (;0.5 to ;0.35). Calling activity of E. coqui and E. cochranae was positively correlated with temperature, while E. brittoni and E. juanariveroi responded negatively to temperature and precipitation. This difference in response to temperature and precipitation could be related to differences in body size and the location of calling sites among the four species. For example, E. brittoni and E. juanariveroi are small species that call from the tips of the vegetation. High temperatures and intense precipitation may cause them to retreat into the vegetation, and reduce calling activity. In contrast, E. coqui and E. cochranae call lower in the vegetation and from leaf axils where they are more protected. Based on these findings, future scenarios of climate change could pose a threat for the survival of the populations of these four species. New climate regimes could negatively affect the calling activity, and thus diminish reproductive events.

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Effects of Forest Fragmentation and Habitat Degradation on West African Leaf‐Litter Frogs

Abstract: Habitat degradation alters the dynamics and composition of anuran assemblages in tropicalforests.

Cited by 73 publications

References 35 publications

The anuran fauna of a Volunteer Nature Reserve: the Tanoé-Ehy Swamp Forests, south-eastern Ivory Coast, West Africa

The anuran fauna of a Volunteer Nature Reserve: the Tanoé-Ehy Swamp Forests, south-eastern Ivory Coast, West Africa

Sexual differences in exploration behavior inXenopus tropicalis?

Variable response of anuran calling activity to daily precipitation and temperature: implications for climate change

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