34 research outputs found
Evolution and Viability of Asian Horseshoe Crabs Appear Tightly Linked to Geo‐Climatic Dynamics in the Sunda Shelf
No full textCitation: Qian Tang, Akbar John, Yusli Wardiatno, Shin Nishida, Xiaoyong Xie, Siddhartha Pati, Handoko Adi Susanto, Sukree Hajisamae, Bryan Raveen Nelson, Wah Wah Min, Mohammad Eusuf Hasan, Tristan Salles, Yilin Chen, Yanhua Qu, Fumin Lei, Byrappa Venkatesh, Frank E. Rheindt, Evolution and Viability of Asian Horseshoe Crabs Appear Tightly Linked to Geo‐Climatic Dynamics in the Sunda Shelf, Conservation Letters, 18(1), 2024-12-16, https://doi.org/10.1111/conl.1307
Does human infringement at the spawning grounds challenge horseshoe crab eggs and their embryogenesis?
No full textEffects of heavy metals on eggs and larvae of horseshoe crab Tachypleus gigas (Muller 1785)
No full textHorseshoe crabs inhabit coastal waters of Peninsular Malaysia, with nesting activity observed at Pantai Balok, Pahang. Pantai Balok is exposed to a variety of human threats such as boating and leisure
activities which contribute to metal contamination. Hatching success of horseshoe crab eggs could be affected because eggs were left to mature buried in sediments during mating periods
Fish as bio-indicator tool for assessing estuarine health
No full textFish Health Index and Index of Biotic Integrity directly indicates environmental health and was used in our monitoring at Coleroon, Vellar and Uppanar, estuaries in the southeast coast of India. The use of cast nets revealed 104 species of fish that belongs to 69 genera, 44 families and 10 orders. Assessment using fish health index at Coleroon, Vellar and Uppanar estuaries produced scores of 4.8692, 8.4981 and 1.4042 which means Vellar has better health than Coleroon and Uppanar. In addition, 12 metrics were used to produce the index of biotic integrity where total scores varied from 18 to 51. With Vellar achieving higher scores than Coleroon and Uppanar estuary, a Two-way ANOVA was employed to validate the data with significant achievement (P<0.005). Therefore, we can safely associate Coleroon, Vellar and Uppanar with ‘Fair’, ‘Good’ and ‘Very poor’ grades. Also, visual depiction of Vellar demarcates it as pristine in comparison to Coleroon and Uppanar that are subject to impairments along with dominance of omnivorous fishes. Knowledge from this study eases monitoring of important estuaries particularly for food security so that management sustains community livelihood
Avian data from Kenyir rainforest trail
No full textThis data article is constructed using avian (bird) counts from a recently identified trail in Kenyir rainforest, East Peninsular Malaysia. Avian chirps and naked eye visual were simultaneously used to locate the birds. After visual binocular and digital image inspection, identification of avian species were carried out using reference books. Data tabulation are divided by monsoon seasons and months before interpret using Shannon and Evenness indices. The highlights like feeding guilds, nativity, iconic species and statuses in the wild are presented with the data to increase its value. Within these, a total of 457 avian individuals from 36 avian family groups were recorded from which, 25 of these avian species occur as near threatened, vulnerable, endangered and critically endangered in the wild. Having these, the tabulated data becomes a calendar for seasonal availability of avian species which considers the 1.0 km trail suitable for bird watching, scientific study and ecotourism purposes
Membrane retention potential of Tachypleus gigas during early embryogenesis
No full textInvestigation on metal ion (Cd2+ and Pb2+) retention within the embryonic shell of Tachypleus gigas
embryos was investigated. Inductively coupled plasma optical emission spectrometry was used for
metal observations whereas developmental abnormalities were observed using a scanning electron
microscope and histology via Harrison-Eosin staining. Metal ions penetrate and regulate between the
extra- and embryonic shell environments to cause delayed embryogenesis only in early embryonic
stages (Stages-E and DE). Ionic regulation was studied and findings showed that the embryonic shell
(ES) was capable of selecting required ions whereas the extra-embryonic shell (EES) having higher
retention potential. Throughout the 34 d of exposure, Se2+ was accumulated in the yolk mass (YM).
Ionic regulation of embryos was influenced by stocking density and concentration of metabolites.
Bioaccumulation factor revealed accumulation potential as EES > ES > YM and thus EES is suitable
for biological membrane development. The mechanism of ionic regulation in the ES membrane can be
used as a model to design a biological membrane capable of removing metals from polluted waters
Episodic human activities and seasonal impacts on the Tachypleus gigas (Müller, 1795) population at Tanjung Selangor in Peninsular Malaysia
No full textThe scientific literature on population dynamics, breeding biology and nesting behaviour of the Asian horseshoe crabs is limited and still to emerge from several locations in South and Southeast Asia. The present study (2009-2011), aimed at observing the spawning activity of Tachypleus gigas (Müler, 1795) in relation to local environmental conditions, was carried out from Tanjung Selangor (Sites 1-3) on the east coast of Peninsular Malaysia. Southwest (SW) monsoon (May-September) was found to be more favourable (range, 456-1309 eggs) than Inter-monsoon (IM) (April and October) (169-317 eggs), whereas no eggs at the time of Northeast (NE) monsoon (November-March). Meanwhile, T. gigas preferred Site-1 (located close to River Pahang mouth) for its nesting in the SW and shifted to Site-2 and/or Site-3 (located 150-200 m interior) in the IM periods. This nest shifting behaviour of T. gigas was primarily associated with the seasonal water current that becomes intensive during NE monsoon. However, the human activities such as sand mining (2010), jetty (2010-2011) and road/bridge (2011 - present) constructions in the vicinity have affected the normal physicochemical conditions of the sediment/water. Importantly, the sediment being represented largely by medium sand with moderate sorting, symmetrical and very leptokurtic properties in 2009 was changed into coarse sand with poor sorting, fine/very fine skewed and extremely leptokurtic in 2010-11. In addition, the heavy metal contamination of Cadmium and Selenium in the sediment and Hydrogen Sulfide in the water increased considerably (2010-11). These changes, not only reduced T. gigas spawning activity/egg counts between 2009 and 2010 (from an average of 912 ± 690 to 360 ± 288) (±SD), but also correlated with its total absence during 2011 (PRIMER v.6). Since Tanjung Selangor beach (adjoining the Terus and Pahang Tua estuary) is one of the very few known spawning grounds for the Malaysian horseshoe crab (T. gigas), it is imperative to conserve and manage this area and it should be sanctioned as a 'Marine Protected Area'.SCOPUS: ar.jinfo:eu-repo/semantics/publishe
Non-volant small mammal data from fragmented forests in Terengganu State
No full textThis data article is about non-volant small mammal (squirrel, rat and tree shrew) capture from fragmented forest understories within sub-urban areas of Setiu (Peladang Agro Resort and Setiu Wetland Research Station) and inhabited areas of Hulu Terengganu (Saok and Lasir waterfalls) that are situated in Terengganu State, Peninsular Malaysia. Fruits like banana and oil palm were individually placed into each cage before the cages were fastened onto three to five meter height tree branches. The traps were also spatially distributed about ten meters from each other. Under this installation, fifty baited traps were used during the twenty-four nights of sample collection. All animals caught were distinguished by morphology and released at the same location it was caught. The understory data comprise of seven non-volant mammal species from family groups Sciuridae, Muridae and Tupaiidae. Overall, Callosciurus notatus (n = 17, 39%) were dominant in the capture pool from all sites. Comparatively, Sundascriurus tenuis (n = 2, 4%) and Rattus rattus (n = 4, 9.3%) were restricted to Saok Waterfalls and Setiu Wetland. Banana and oil palm fruits did not attract any small mammals during the Lasir Waterfall (Hulu Terengganu) survey. All data were interpret into Shannon, Simpson, Margalef, Menhinik and Evenness indices to individually or collectively distinguish small mammal variety in Terengganu State. Keywords: Herbivore, Cage trap, Tropics, Catch and release, Understor
Influences of environmental parameters and phytoplankton productivity on benthic invertebrates in a tropical oligotrophic lake, northern Malaysia
No full textStudies that associate environmental parameters with aquatic organisms in man-made lakes remain limited by accessibility and interest particularly in many Asian countries.Withmissed opportunities to monitor environmental transitions at Lake Kenyir, our knowledge of lake transition is restricted to the non-mixing shallow waters only. Triplicate monthly benthic invertebrate samples were collected concurrentlywith various environmental parameters at three locations (zonesA–C) of Kenyir Lake,Malaysia. Our results affirmed that the northeast part of Lake Kenyir is oligotrophic. Abundance of phytoplankton, total suspended solids, phosphate, nitrite and nitrate drive the abundance of various groups of benthic invertebrates. All of these extrinsic variables (except phosphate) negatively influenced the density of Trichoptera and positively influenced (P<0.05) the densities of Polychaeta, Oligochaeta, Bivalvia, Gastropod, Isopoda and Copepod in all zones. Phosphate negatively influenced the density of Trichoptera and positively influenced (P<0.05) the densities of Oligochaeta, Bivalvia and Copepod. Its influences on the Polychaeta, Gastropod and Isopoda densities were zone-specific. Overall, seasons equally influenced the relationships between extrinsic and response variables in all zones. The results of this study are useful to evaluate the lake’s environmental quality, in
conservation and in similar projects involving environmental handling, monitoring and recovery
Violent crime datasets: Incidence and patterns in Malaysia from 2006 to 2017
No full textThis article provides violent crime data in Malaysia from 2006 to 2017. The violent crimes include murder, rape, gang robbery, robbery and voluntarily causing hurt cases. A total of 330,395 violent crime cases were reported in this 12 year period and the data were tabulated state by state for all thirteen states of Malaysia, including two states in Borneo (Sabah and Sarawak) and one federal territory (Kuala Lumpur). In general, violent crimes show a decreasing trend from 2006 to 2017 in Malaysia. However, armed gang robbery and armed robbery show a fluctuating pattern from 2008 to 2011. A similar pattern was also recorded for unarmed gang robbery from 2008 to 2010. The violent crime data deposited here are available for further analysis, e.g., for identifying risk factors such as demography, lifestyle, socio-economic status, government policies etc. which may be associated with violent crime incidence and pattern across the country.Full Tex
