The neritid snails of Brunei Darussalam: their geographical, ecological and conservation significance

Mustapha, Nurshahida; Baharuddin, Nursalwa; Tan, Siong Kiat; Marshall, David J.

doi:10.37828/em.2021.42.2

Cited by 6 publications

(6 citation statements)

References 23 publications

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“…On Nipa palms, muddy surfaces, old wood and rocks in brackish habitats and mangrove forests ( Swennen et al 2001 ; Mustapha et al 2021 ) as well as on gravels in high tidal zones ( Yang et al 2017 ).…”

Section: Resultsmentioning

confidence: 99%

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Mid-Holocene marine faunas from the Bangkok Clay deposits in Nakhon Nayok, the Central Plain of Thailand

Jirapatrasilp,

Cuny,

Kocsis

et al. 2024

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Based on several field investigations, many molluscan shells and chondrichthyan teeth, together with other invertebrate and actinopterygian remains were found from the marine Bangkok Clay deposits in Ongkharak, Nakhon Nayok, at a depth of ~ 5–7 m below the topsoil surface. Animal macrofossils recovered from these Holocene marine deposits were identified and their chronological context was investigated in order to reconstruct the paleoenvironments of the area at that time. The majority of marine fossils recovered from the site consist of molluscs, with a total of 63 species identified. Other invertebrate species include a stony coral, a mud lobster, barnacles, and a sea urchin. The vertebrates are represented by fish remains, including carcharhinid shark teeth from at least nine species, stingray and trichiurid teeth, and one sciaenid otolith. The molluscan fauna indicates that the paleoenvironments of the area corresponded to intertidal to sublittoral zones, where some areas were mangrove forests and intertidal mudflats. The fish fauna is dominated by the river shark Glyphis, indicating freshwater influences and possibly occasional brackish conditions. The carbon-14 analysis of mollusc and charcoal remains shows that deposition of the marine sediment sequence began during the mid-Holocene, spanning approximately from 8,800 to 5,300 cal yr BP. This study provides in-depth insights into the diversity of fishes, marine molluscs, and other invertebrates from the Bangkok Clay deposits, supporting the existence of a marine transgression onto the Lower Central Plain of Thailand during the mid-Holocene.

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Section: Resultsmentioning

confidence: 99%

“…On tree trunks, branches, roots and on muddy banks and rocky areas or near mangrove forests ( Tan and Clements 2008 ; Mustapha et al 2021 ) as well as on rocks in intertidal zones ( Yang et al 2017 ).…”

Section: Resultsmentioning

confidence: 99%

Mid-Holocene marine faunas from the Bangkok Clay deposits in Nakhon Nayok, the Central Plain of Thailand

Jirapatrasilp,

Cuny,

Kocsis

et al. 2024

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“…Nerita chamaeleon , N. undata and N. albicilla were taken from the Empire, along the South China Sea coastline (4.9694°N, 114.8551°E), N. balteata and N. planospira from the mangroves at Pulau Bedukang, Brunei Bay (4.9795°N, 115.0576°E) and Neript. violaceum from mangroves at Sungai Kedayan, a tributary of the Sungai Brunei (4.8981°N, 114.9341°E; Mustapha et al, 2021 ). More than 15 adult individuals of each species were returned to the laboratory under cool conditions, where they were kept before experiments in an incubator at a constant 27°C on a moist substratum and high humidity for 1–2 days.…”

Section: Methodsmentioning

confidence: 99%

“…At least 16 species occur on the shorelines of Brunei, with Nerita undata Linnaeus, 1758, Nerita chamaeleon Linnaeus, 1758 and Nerita albicilla Linnaeus, 1758, being abundant in rocky shore habitats, and Nerita planospira Anton, 1838, Nerita balteata Reeve, 1855 and Neripteron violaceum Gmelin, 1791, being abundant in mangrove habitats ( Fig. 1 ; Mustapha et al, 2021 ; Mustapha and Marshall, 2021 ). The rocky-shore snails experience more extreme and variable temperatures, ranging between 27°C and 50°C, whereas local mangrove habitat temperatures (both sunned muddy surfaces or shaded trees) seldom rise above 35°C ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Conservation of thermal physiology in tropical intertidal snails following an evolutionary transition to a cooler ecosystem: climate change implications

Marshall,

Mustapha,

Monaco

2023

Conservation Physiology

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Predictions for animal responses to climate warming usually assume that thermal physiology is adapted to present-day environments, and seldom consider the influence of evolutionary background. Little is known about the conservation of warm-adapted physiology following an evolutionary transition to a cooler environment. We used cardiac thermal performance curves (cTPCs) of six neritid gastropod species to study physiological thermal trait variation associated with a lineage transition from warmer rocky shores to cooler mangroves. We distinguished between functional thermal performance traits, related to energy homeostasis (slope gradient, slope curvature, HRmax, maximum cardiac activity and Topt, the temperature that maximizes cardiac activity) and a trait that limits performance (ULT, the upper lethal temperature). Considering the theory of optimal thermal performance, we predicted that the functional traits should be under greater selective pressure to change directionally and in magnitude than the thermal limit, which is redundant in the cooler environment. We found little variation in all traits across species, habitats and ecosystems, despite a ~20°C reduction in maximum habitat temperature in the mangrove species over 50 million years. While slope gradient was significantly lowered in the mangrove species, the effect difference was negated by greater thermal plasticity in the rocky shore species. ULT showed the least variation and suggested thermal specialization in the warmest habitat studied. The observed muted variation of the functional traits among the species may be explained by their limited role in energy acquisition and rather their association with heat tolerance adaptation, which is redundant in the mangrove species. These findings have implications for the conservation of habitat of intertidal gastropods that transition to cooler environments. Furthermore, they highlight the significance of evolutionary history and physiological conservation when predicting species responses to climate change.

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“…Its habitat in Kuala Bubon and Kuala Tadu has an area of approximately 166 ha and 23 ha, respectively. Both of these ecosystems are categorized as semi-enclosed waters that tend to be shallow, narrow, and notched due to their geomorphological characteristics of bar-built estuaries [6,7].…”

Section: Introductionmentioning

confidence: 99%

The Species Composition of Phytoplankton and Nutrient Content in the Nipa Nypa fruticans Ecosystem on the West Coast of Aceh, Indonesia

Fithria¹,

Basri²,

Indra³

et al. 2022

IJDNE

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Nipa Nypa fruticans grows in estuaries that are affected by sea waters and freshwater. Therefore, the Nipa habitat develops into an area of water mass circulation and becomes rich in nutrients that trigger the growth of phytoplankton as the primary producer in the aquatic ecosystem. This study aimed to examine the species composition and distribution of phytoplankton and nutrient content in the nipa ecosystem on the west coast of Aceh, Indonesia. It was conducted from July 2018 to September 2019 and sampling was carried out in two areas, namely Kuala Bubon Aceh Barat district and Kuala Tadu, Nagan Raya district. A total of 100L of surface water samples was taken from three points at each location. Subsequently, the water was filtered with a plankton net mesh No. 25 and preserved with a 4% Lugol solution. The water sample from both locations was also analyzed for nitrogen and phosphorus contents. The results showed that there were 20 species of phytoplankton in both sampling locations, with Kuala Bubon consisting of 13 species with density of 160.87 cells L-1, and 15 species in Kuala Tadu with density of 273.64 cells L-1. Haramonas sp. was the dominant species in Kuala Bubon, while Amphisolenia bidentata was dominant in Kuala Tadu. Based on the nutrient content (nitrate+nitrite and phosphate), the average nutrient content in Kuala Bubon was 1.31 mg L-1 (mesotrophic) and 0.12 mg L-1 phosphate (hypertrophic). Meanwhile, Kuala Tadu had 1.078 mg L-1 nitrate+nitrite (mesotrophic) and phosphate, 0.22 mg L-1 (hypertrophic) waters. These findings are an early indication that the estuary of Kuala Bubon and Kuala Tadu have been contaminated by organic matter.

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The neritid snails of Brunei Darussalam: their geographical, ecological and conservation significance

Cited by 6 publications

References 23 publications

Mid-Holocene marine faunas from the Bangkok Clay deposits in Nakhon Nayok, the Central Plain of Thailand

Mid-Holocene marine faunas from the Bangkok Clay deposits in Nakhon Nayok, the Central Plain of Thailand

Conservation of thermal physiology in tropical intertidal snails following an evolutionary transition to a cooler ecosystem: climate change implications

The Species Composition of Phytoplankton and Nutrient Content in the Nipa Nypa fruticans Ecosystem on the West Coast of Aceh, Indonesia

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