Biological and population parameters of Tiger Shark <i>Galeocerdo cuvier</i>, landed in Tanjung Luar, West Nusa Tenggara

Jatmiko, Irwan; Nugroho, Suciadi Catur

doi:10.1051/e3sconf/202014702010

Cited by 3 publications

(1 citation statement)

References 24 publications

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“…Charismatic marine megafauna that inhabit coastalscapes are mobulid rays, carcharhinid sharks and cheloniid sea turtles. They fulfill key roles as predators or grazers in coastal ecosystems in the (sub)tropics (Ferretti et al, 2010;Roff et al, 2016), yet their persistence is threatened by (over)fishing, loss of breeding habitat, pollution, habitat disturbance and pathogens (Clarke et al, 2006;Estes et al, 2011;Brooks et al, 2013;Vianna et al, 2013;Ward-Paige et al, 2013;Dwyer et al, 2020;Jatmiko and Catur Nugroho, 2020). As a result, most of these marine megafauna are now listed as vulnerable, near-threatened or endangered on the international union for conservation of nature red list of threatened species (Marshall et al, 2011;Brooks et al, 2013).…”

Section: Stochastic Environmentmentioning

confidence: 99%

Unusually Paced Life History Strategies of Marine Megafauna Drive Atypical Sensitivities to Environmental Variability

2020

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Understanding why different life history strategies respond differently to changes in environmental variability is necessary to be able to predict eco-evolutionary population responses to change. Marine megafauna display unusual combinations of life history traits. For example, rays, sharks and turtles are all long-lived, characteristic of slow life histories. However, turtles also have very high reproduction rates and juvenile mortality, characteristic of fast life histories. Sharks and rays, in contrast, produce a few live-born young, which have low mortality rates, characteristic of slow life histories. This raises the question if marine megafaunal responses to environmental variability follow conventional life history patterns, including the pattern that fast life histories are more sensitive to environmental autocorrelation than slow life histories. To answer this question, we used a functional trait approach to quantify for different species of mobulid rays, cheloniid sea turtles and carcharhinid sharks – all inhabitants or visitors of (human-dominated) coastalscapes – how their life history, average size and log stochastic population growth rate, log(λs), respond to changes in environmental autocorrelation and in the frequency of favorable environmental conditions. The faster life histories were more sensitive to temporal frequency of favourable environmental conditions, but both faster and slower life histories were equally sensitive, although of opposite sign, to environmental autocorrelation. These patterns are atypical, likely following from the unusual life history traits that the megafauna display, as responses were linked to variation in mortality, growth and reproduction rates. Our findings signify the importance of understanding how life history traits and population responses to environmental change are linked. Such understanding is a basis for accurate predictions of marine megafauna population responses to environmental perturbations like (over)fishing, and to shifts in the autocorrelation of environmental variables, ultimately contributing toward bending the curve on marine biodiversity loss.

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Section: Stochastic Environmentmentioning

confidence: 99%

Unusually Paced Life History Strategies of Marine Megafauna Drive Atypical Sensitivities to Environmental Variability

2020

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Population dynamics of the data-poor tiger shark (Galeocerdo cuvier) in the Northwest Pacific Ocean: Measurement of growth parameters and mortality rates

Hung,

Huynh,

Tsai

2024

Regional Studies in Marine Science

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Migratory movements, distribution, habitat preference, and activity patterns of the endangered Abbott’s booby Papasula abbotti

Chambon,

Börger,

Weimerskirch

et al. 2024

Mar. Ecol. Prog. Ser.

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The Abbott’s booby Papasula abbotti is one of the most threatened seabirds in the world. The non-breeding behaviour and distribution of Abbott’s boobies are largely unknown but evidence suggests they migrate between breeding attempts. This lack of information impedes the identification and quantification of the threats the birds are exposed to outside of their breeding season. We studied the migratory movements of Abbott’s booby using geolocator-immersion loggers. A total of 22 adult birds were tracked between 2007 and 2014. Analysis of the 27 migratory trips revealed that birds migrated on average 2500 km east of Christmas Island to an area centred around the Banda Sea, Indonesia. The timing of Abbott’s booby migration (from November-December to April) coincides with the Indonesian-Australian monsoon, a period characterised by reversing prevailing winds and decreased regional oceanic primary productivity. The birds’ movements matched the pattern of reversal of the prevailing winds. No birds were recorded on migration between 17 May and 26 October, which suggests that the whole population of adult Abbott’s boobies is on Christmas Island during that period. Migrating Abbott’s boobies spent little time on the water during the day or at night (15%), and individuals preferred waters with a narrow range of sea surface salinity (32.5-34.5 PSU), rugged seafloor topography, and sea surface temperatures above ca. 28°C. Overall, these novel results identify the area within which potential threats, such as interactions with fisheries or effects of climate change on the species’ marine habitats, should be investigated.

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Biological and population parameters of Tiger Shark Galeocerdo cuvier, landed in Tanjung Luar, West Nusa Tenggara

Cited by 3 publications

References 24 publications

Unusually Paced Life History Strategies of Marine Megafauna Drive Atypical Sensitivities to Environmental Variability

Unusually Paced Life History Strategies of Marine Megafauna Drive Atypical Sensitivities to Environmental Variability

Population dynamics of the data-poor tiger shark (Galeocerdo cuvier) in the Northwest Pacific Ocean: Measurement of growth parameters and mortality rates

Migratory movements, distribution, habitat preference, and activity patterns of the endangered Abbott’s booby Papasula abbotti

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