Showing 34 results for Subject: Ecological Diversity
Mohammad Forouhar Vajargah, Masoud Sattari, Javid Imanpour Namin, Mehdi Bibak,
Volume 2, Issue 2 (6-2020)
Abstract
Fish stock assessment in the Caspian Sea requires employing some growth indicators such as length-weight relationship (LWR). Size determination in fish is more biologically relevant than age, because several ecological and physiological indicators are more size-dependent compared to age-dependent. This study aims to examine the length-weight relationship and condition factor of Rutilus kutum (Kamensky) from the southern Caspian Sea. 218 fish samples were caught using a gill net from Anzali, Astara, Kiashahr, Sari and Torkaman Port from September 2018 to February 2019. Negative allometric growth patterns were observed in Sari and Torkaman Port and positive allometric growth patterns were found in Anzali, Kiashahr and Astara stations. The fish caught from Anzali displayed the maximum condition factor. LWRs are not continuous over the year and LWR indices may vary significantly due to biological, food availability, temporal and sampling factors, and also by fish health and sex. Relative weights in fisheries studies can be used for comparing condition across different populations and species. Investigations carried out indicate that growth of R. kutum in recent years has decreased.
Gauri Joshi, Bijaya Neupane, Deepa Dahal, Sami Shrestha, Prakash Dhakal, Catherine Mhae B. Jandug, Deepak Gautam,
Volume 2, Issue 3 (9-2020)
Abstract
Human-wildlife conflict (HWC) is on an increasing trend and has become one of the most challenging problems for the rural communities of developing nations like Nepal. There is limited information available on HWC in Kailali district, Nepal. The objective of our study was to explore the different incidents and the perceptions of local people on HWC within four different sites in Kailali district. To collect information three different methods were used, a questionnaire survey (n= 80), key informant interviews (n= 10) and focus group discussions (n= 4); all during February and March 2018. Different records of HWC incidents were collected that occurred during the period of one year in 2017, except for information on human attacks which were collected from 2015 to 2017. Of the total of 102 HWC incidents, crop damage was the most severe problem followed by property damage (15) and livestock depredation (9). The Asian elephant (n= 54) was the most conflicting species for crop damage, followed by the Rhesus macaque (n= 23) and the wild pig (n= 14). Similarly, property damage was mostly caused by elephants (n= 10) and other animals (n= 5). Rice (43%) was the most damaged crop type by the conflicting species, followed by wheat (28%) and then maize (9%). For property damage, 19% of respondents reported suffering house damage while 11% suffered damage to stored food. Shouting and hitting drums was the most applied measure during HWC’s but other measures for human-wild animals co-existence and resolution are suggested.
Bivek Gautam, Santosh Bhattarai,
Volume 2, Issue 3 (9-2020)
Abstract
We present a natural history account of the first record of probable predation on the Indian bull frog, Hoplobatrachus tigerinus by the Asian House Shrew, Suncus murinus from Morang district, Nepal. The present communication provides an example of a nearly equal-sized predator-prey interaction in a natural ecosystem and provides interesting information on the natural history of these taxa.
Bivek Gautam, Santosh Bhattarai,
Volume 2, Issue 3 (9-2020)
Abstract
The dietary habits of tadpoles of the Nepalese anurans have not been well studied. Here, we present an opportunistic observation of tadpoles of the Terai tree frog, Polypedates teraiensis feeding on rotten pumpkin (Cucurbita moschata). We suggest further detailed study on the feeding habits of tadpoles in the changing climate in Nepal as they could be used as model organisms to understand their trophic roles and to predict the ecological consequences of their potential loss.
Pooja R Patel, Krupal J Patel, Kauresh D Vachhrajani, Jigneshkumar N Trivedi,
Volume 2, Issue 4 (12-2020)
Abstract
The present study deals with gastropod shell utilization of the hermit crab, Clibanarius rhabdodactylus Forest on the rocky intertidal zone of the Saurashtra coast, Gujarat State, India. Collection of the specimens was carried out using a hand-picking method in June and December 2018 during low tide. The hermit crab weight (HW) and shield length (SL) were measured and sorted in different class intervals of 1 mm each. Gastropod shells were identified and morphological variables such as shell dry weight (DW), shell length (SHL), shell volume (SHV), shell aperture length (SAL), and shell aperture width (SAW) were recorded. A total of 2000 individuals of C. rhabdodactylus were collected, occupying 29 different species of gastropod shells. Males and non-ovigerous females occupied a greater number of gastropod shell species (25 and 27 respectively) as compared to ovigerous females (23 species). Males and ovigerous females preferred larger shells as compared to non-ovigerous females. Cerithium caeruleum (Sowerby II) (67.1%) was the highest occupied gastropod shell species followed by Lunella coronata (Gmelin), Tenguella granulata (Duclos) and Turbo bruneus (Roding). Regression analysis showed a moderate relationship between the different morphological variables of hermit crabs and gastropod shells; the highest values of coefficient of determination were obtained between hermit wet weight and gastropod shell dry weight. The values of relationship between different morphological variables of hermit crabs and gastropod shells suggest that shell architecture has a significant impact on shell utilization patterns of C. rhabdodactylus.
Ashraf Jazayeri, Fahimeh Saberi, Tayebeh Mohammadi,
Volume 3, Issue 1 (3-2021)
Abstract
The Marsh frog, Pelophylax ridibundus (Pallas) is distributed in Central Europe from northeastern France, north to the southern shorelines of the Baltic Sea (and extreme southern Finland), south to northeastern Spain, northern Italy and the Balkans including eastern Greece, east to approximately 81° E in Asiatic Russia, and south to western Iran and Afghanistan. The present study has been conducted on populations of P. ridibundus in the northern, eastern and southern regions of the Shadegan Wetland of Khuzestan Province, Iran with the aim of examining some aspects of its morphology and karyotype. Frog specimens were collected from different portions of the Shadegan Wetland during spring and autumn 2016 and transferred to the laboratory. According to the morphological results, three color patterns are identified among the samples in terms of the morphology, morphometry and sex - according to the sex independency test. T-test results between males and females indicate a significant difference in all traits and the results of a T2 Hotelling test show that there is sexual dimorphism between males and females. However, the results of multivariate analysis of variance (MANOVA) illustrate a separation between males of the northern region and the two other regions, and no differentiation between females in the eastern and southern regions of the wetland. The karyotype of the species in the wetland included 2n = 26, one pair of which had a sex chromosome.
Jash Hang Limbu, Suren Subba, Jeevan Kumar Gurung, Jawan Tumbahangfe, Bharat Raj Subba,
Volume 3, Issue 1 (3-2021)
Abstract
We assessed the correlation of fish assemblages with habitat and environmental variables temporally from July and October, 2019 and January and April, 2020 across 5 study sites in the Phewa Khola stream of Mangsebung Rural Municipality, Ilam, Nepal. We sampled 3571 fish representing 13 species, belonging to 3 orders, 4 families, and 9 genera. An analysis of similarity (ANOSIM) indicated that there is a significant difference between the fish assemblage structure in space (R= 0.833, P= 0.001) but not in time (R= -0.148, P= 0.985). Our habitat study showed that glides, runs, pools and deep pools are the primary habitats contributing to the maximum diversity in the Phewa Khola stream. The canonical correspondence analysis (CCA) affirmed that variables such as pH, water temperature, water velocity, total hardness and dissolved oxygen play an important role in shaping fish species distribution. Results from the similarity percentage analysis (SIMPER) hinted that, 67.08% similarity was found between the months and the major contributing species were Schistura multifasciata (20.61%), Devario aequipinnatus (16.48%), Schistura rupecula (15.65%), Garra annandalei (15.36%), Schistura horai (7.74%), Schistura scaturigina (5.91%), Schistura savona (5.74%), Schizothorax plagiostomus (4.37%), Channa punctata (3.9%), Puntius terio (1.9%) and Neolissochilus hexagonolepis (1.39%). On the contrary, a 76.23% similarity was found between the sites and the major contributing species were Schistura multifasciata (21%), Devario aequipinnatus (16.8%), Garra annandalei (15.89%), Schistura rupecula (15.38%), Schistura horai (7.7%), Schistura scaturigina (5.66%), Schistura savona (4.9%), Schizothorax plagiostomus (4.4%), Channa punctata (3.97%), Puntius terio (2%) and Neolissochilus hexagonolepis (1.43%). Ongoing road development, micro-hydropower generation, the use of poisonous herbicides, illegal electro-fishing, deforestation and water diversion are all found to be major threats to the present fish species of the Phewa Khola stream.
Santosh Bhattarai, Babu Ram Lamichhane, Naresh Subedi,
Volume 3, Issue 1 (3-2021)
Abstract
Abnormalities in reptiles have been mostly reported from captive individuals. Here, we report a case of unilateral anophthalmy in the Burmese python Python bivittatus for the first time from Chitwan National Park, Nepal. Reptiles exposed to various pollutants, such as pesticides, can develop morphological abnormalities. The present report from a human-dominated landscape is an opportunistic observation of a rescued snake. We suggest a more systematic, collection-based, research program to reveal the possible causative agents and the degree of their effect on herpetofauna in Nepal.
Raju Vyas,
Volume 3, Issue 1 (3-2021)
Abstract
Blanford’s Rock Agama, Psammophilus blanfordanus is an Indian endemic species of lizard in family Agamidae. A pair of the species was kept in captivity for six months for a breeding biology study. The female laid six eggs (average size 12.61 x 8.13 mm) in the month of August and hatchlings emerged after 34 days of incubation. Ambient temperature ranged between 27.5 to 31.5 °C. Average hatchling size was 24.15 mm snout to vent length and 33.63 mm tail length. All of the six eggs hatched.
Pranav Pandya, Mansi Thakkar, Mansi Goswami,
Volume 3, Issue 2 (6-2021)
Abstract
Natural and human disturbances can affect population and community assemblages in complex ways. The present study was carried out from June 2019 to January 2020, along the Northern Gulf of Kachchh (can also be spelled as Kutch), western India wherein an effort was made to investigate the intertidal assemblage at three distinct but spatially closely located stations (Kathda, Mandvi, and Modhva). The efforts were also made to correlate anthropogenic effects with intertidal assemblage. The Mandvi station served as an anthropogenically active area whereas the other two remained as control stations with minimal disturbance. Replicate quadrat samples on fixed transect lines and wet biomass analyses were carried out for three seasons. In total, 43 species, viz. Mollusca (21), Crustacea (12), Polychaeta (7), Nemertea (1), and fishes (2) were recorded. Cumulatively, during pre-monsoon, post-monsoon and winter, overall population densities ranged from 0 to 999 individuals/m2; biomass from 0 to 899 g/m2, and the Simpson evenness index score remained between 0.15 to 0.89. Overall, high density and diversity were observed during winter (December 2019 and January 2020) with the maximum number of two Mollusc species Umbonium vestiarium and Cerethidia cingulata. High densities were observed at the Modhva station followed by Kathda and Mandvi stations. Relatively lower intertidal macrofaunal diversity and density were clearly observed at Mandvi station which is a famous tourist destination. Comparative data recorded in the present study can serve as a vital baseline and can be a part of future monitoring processes, especially at anthropogenically influenced stations.
Sachin Timilsina, Rama Mishra, Amit Adhikari, Subash Gautam, Bijaya Neupane,
Volume 3, Issue 2 (6-2021)
Abstract
The Fishing cat, Prionailurus viverrinus is a medium-sized, wild felid, native to south and Southeast Asia. The global status of the species has been assessed as ‘Vulnerable’ by the IUCN Red List of Threatened Species and it is further listed as ‘Endangered’ in Nepal. Knowledge on the species is limited due to scarce research studies, resulting in a lack of ecological information. A few conservation programs for the species have been initiated in the past but current concern is that conservation programs may not be sufficient for the long-term survival of the species in Nepal. Therefore, we reviewed the available published scientific literature and anecdotal reports relating to the Fishing cats in Nepal, and used this data to assess current population status, distribution, threats and conservation efforts for the species. We screened and selected 49 scientific papers and reports related to Fishing cats for the current study and analyzed them to produce our findings. Our results found that fishing cats are recorded from five protected areas, and three non-protected wetland areas, within the Terai region of Southern Nepal. Two publications are found that substantiate the population status of the species in the country. In Protected Areas of Nepal, most of the Fishing cat records were accessed through camera trap surveys targeting large cat species. Fishing cats have been facing extinction threats mainly due to poaching, human over-exploitation of local fish stocks, retaliatory killing, wetland shrinkage and conversion, pollution and other conflicts with humans. We believe our review will be a useful guide for conservationists, managers and wildlife researchers to promote the conservation of this charismatic and threatened species in Nepal.
Naresh Subedi, Babu Ram Lamichhane, Yajna Nath Dahal, Ram Chandra Kandel, Madhuri Karki Thapa, Rajan Regmi, Binod Shrestha,
Volume 3, Issue 2 (6-2021)
Abstract
Conserving tigers (Panthera tigris) in highly fragmented landscapes is a daunting task. Terai Arc Landscape (TAL) at the base of the Himalayas aims to connect the remaining Tiger habitats in southern Nepal and northwestern India. Tiger population clusters in central (Chitwan-Parsa) and western (Bardia-Banke) Nepal are distinct with limited connectivity in recent past. We present the photographic evidence of Bengal tiger (P. tigris tigris) from forest patch between these population clusters for the first time. The photographs were obtained during camera trap survey across Chure region of Nepal in 2018. Two adult tigers–a female and a male—were photographed ~40 km apart. This record indicates the possibility that tiger habitat extends outside the protected areas in Nepal and natural linkages between Chitwan-Parsa and Bardia-Banke tiger population clusters through forest corridors along the Chure region. Conservation efforts should also focus on the forests outside protected areas especially the critical biological corridors to conserve tigers in TAL via a meta-population approach.
Bijaya Dhami, Sachin Timilsina, Amit Adhikari, Bijaya Neupane, Nar Bhadur Chhetri, Alisha Sharma, Aakash Paudel, Mahamad Sayab Miya, Byanjana Sharma, Apeksha Chhetri,
Volume 3, Issue 2 (6-2021)
Abstract
The red panda (Ailurus fulgens), an arboreal mammal belonging to the family Ailuridae, and order Carnivora with herbivorous tendencies is distributed across the mountains of Nepal, Bhutan, China, India, and Myanmar. Due to different anthropogenic activities, the wild populations of A. fulgens have declined by 50% across these range countries. There are many gaps in the current knowledge concerning this endangered, elusive, and charismatic animal. We applied a systematic review process to better understand the research trends, conservation threats, and approaches and identified research gaps that potentially impact the long-term conservation of A. fulgens. Altogether, we analyzed 168 published papers over 33 years and in different thematic areas. Our study revealed that studies on A. fulgens are not evenly distributed across the range of the species, with the majority of them being from China, then Nepal, and very few from Bhutan, India, and Myanmar. The majority of the literature concerning captive and free-ranging populations of A. fulgens is skewed toward different aspects of biology including anatomy, general behavior, reproduction, nutrition, and different aspects of habitat including distribution patterns, and habitat use. There is limited information on A. fulgens genetics and it is confined to Chinese populations. Studies on diseases, the impact of anthropogenic activities like tourism, infrastructure development, movement ecology, interaction with other associated species, and studies addressing the impact of climate change on this species are very sparse. Hence, for the conservation success of A. fulgens understanding, these issues are critical.
Bipana Maiya Sadadev, Thakur Silwal, Bijaya Dhami, Nabaraj Thapa, Bijaya Neupane, Anisha Rana, Harsha Bahadur Singh,
Volume 3, Issue 3 (9-2021)
Abstract
Few researches have been conducted on the hispid hare Caprolagus hispidus, an endangered small mammal native to the southern foothills of the Himalayas. In major protected areas of Nepal, grassland burning has been considered as one of the most important habitat management tools however its effects on grassland dependent species such as hispid hare has been less explored. Thus, this study was conducted to determine the grassland burning practices and its effect on distribution pattern of hispid hare at Shuklaphanta National Park, far-western Nepal. A total of 90 plots were laid in unburned (n= 45) and burned areas (n= 45) from November 2017 to May 2018. Two different approaches of grassland burning were observed: alternate and complete burning. Grassland burns are conducted from November to April each year, which coincides with the prime breeding season of hispid hares. A total of 89 pellet groups were observed in 22 plots out of 45 unburned plots while a total of 56 pellet groups were found in 17 plots out of 45 burned plots, both showing clumped type of distribution pattern of hispid hare in the study site. Higher number of fresh pellets was observed in the unburned plot. In contrast, higher number of old pellets was found in the burned plots. Thus, it is suggested that alternate year burning practices might have more positive effects on distribution and survival of this endangered species, rather than every year.
Anirudh Vasava, Raju Vyas, Vishal Mistry, Pradhyuman Sindha,
Volume 3, Issue 4 (12-2021)
Abstract
The freshwater ecosystems in Gujarat State, in the western part of India, are important habitats for various freshwater turtles. Due to the lack of information on survival and the morality of the freshwater turtles, we present new information on threats to the the Indian Flap-shelled turtle Lissemys punctata (Bonnaterre) and species mass mortalities observed in some water bodies of the Gujarat State. Approximately 1071 specimens of L. punctata and three specimens of the Ganges Soft-shelled turtle Nilssonia gangetica (Cuvier), along with large numbers of many other species of reptiles and fishes were recorded dead within a span of five years from January 2016 to December 2020. In some of the cases, the circumstantial evidence suggests that entanglement and trapping in fish nets could have been the reason, but large number of the deaths remained mysterious. This mysterious sudden death of aquatic reptiles in various water bodies of the state is of serious concern. We also discuss the possible explanation for these mysterious deaths.
Shailendra Kumar Yadav, Babu Ram Lamichhane, Naresh Subedi, Hari Bhadra Acharya, David W. Macdonald, Amy Fitzmaurice,
Volume 3, Issue 4 (12-2021)
Abstract
The Rusty-spotted Cat Prionailurus rubiginosus is a ‘Near Threatened’ small felid native to South Asia. It was believed to occur only in India and Sri Lanka, but recent studies confirmed its presence in the Bardia National Park (BNP) and Shuklaphanta National Park, Nepal. Here we add evidence of the species in the Banke National Park (BaNP) in 2013 and Bardia National Park (BNP) in 2017. A pair of motion sensor cameras was installed either side of the game trail, forest road or stream bed, maximizing the possibility of tiger capture. Cameras were active for a minimum of 15 days in each sampling location. Camera trap photos were systematically sorted species- wise. A photograph of a single individual rusty-spotted cat was obtained in BaNP in the hot dry season (April–May) of 2013. The camera trap location in BaNP lies in dry- deciduous Sal Shoresa robusta forest at a distance of approximately 4.3 km from the nearest settlements. Additional photographs of rusty-spotted cat were obtained in BNP during the camera trap survey conducted in the dry season (January-April) of 2017. Importantly, the BNP detections confirm the presence of rusty-spotted cats in community forests outside protected areas. These findings reinforce mounting evidence of the value of observations of elusive species made as by-catch from camera-trapping studies focused on tigers or other large charismatic fauna, especially in the context of extending information on poorly known geographical ranges.
Shahla Barmooz, Atta Mouludi-Saleh, Soheil Eagderi, Asghar Jafari-Patkan,
Volume 3, Issue 4 (12-2021)
Abstract
In the present study, the length-weight relationships (LWRs) of 148 specimens representing four species, including 20 specimens of Pseudorhombus javanicus, 70 Plicofollis dussumieri, 28 Scarus persicus and 30 S. fuscopurpureus collected from the Persian Gulf were estimated. The LWRs equations were found as W= 0.67×L2.23 for P. javanicus, W= 0.05×L2.38 for P. dussumieri, W= 0.62×L2.15 for S. persicus and W= 0.27×L2.41 for S. fuscopurpureus. The values of b ranged from 2.15 (S. persicus) to 2.41 (S. fuscopurpureus), with the coefficient of determination (r2) greater than 0.85. The present study presents the LWRs parameters for P. javanicus from the Persian Gulf, Iran for the first time and provides useful information for marine ecologists, fishery managers, the conservation of marine fishes, and the online database of FishBase.
Ayan Mondal, Nilanjan Das, Sudipto Mandal,
Volume 4, Issue 1 (3-2022)
Abstract
The domestication of rice (Oryza sativa L.) has a rich history with its diversification from wild progenitors based on genetic differences. For human benefit, natural environments have been agriculturally modified. Concurrently, the biodiversity of natural or wild environments is greatly affected. Here, a comparison has been made between the biodiversity associated with wild-type rice and domesticated rice fields. Species were categorized into broad groups, i.e. Arthropoda (Arth), Other Invertebrate (OInv), Vertebrate (Vert), Algae (Alg), Fungi (Fng), Pteridophyta (Ptrd), and Higher Plant (HPlan). Physico-chemical factors including water depth (WD), water pH (pH), temperature (T), total hardness (TH), dissolved organic carbon (DOC), turbidity (Turb), and dissolved oxygen (DO) were measured directly in the field. Statistical analysis such as Student’s t-test, Kolmogorov-Smirnov test for equal distributions, tests for dominance and multiple indices including Simpson, Shannon, and Evenness were used to assess the biodiversity. Furthermore, Principal Component Analysis (PCA) and Multivariate Analysis of Variance (MANOVA) were used for community comparisons, and SIMPER analysis was used to assess dissimilarity between taxa. The Artificial Neural Network model (ANN) was applied to assess the relative importance of factors governing the system. The present study showed the assemblage of species in the wild along with domestication. The vertebrate species number was well correlated with all the other biotic groups indicating a bottom-up controlling pattern in the rice field ecosystem. The ANN analysis showed that of the environmental factors examined, WD played the most important role followed by pH, T, DOC, and DO as the next most influential factors in distinguishing wild and domesticated rice field ecosystems. SIMPER analysis demonstrated that arthropods were a major contributor to dissimilarity. Collectively our results showed that the domestication of rice led to a decline in biodiversity.
Sujan Bohara, Rajeev Joshi, Bishow Poudel,
Volume 4, Issue 1 (3-2022)
Abstract
The Gharial (Gavialis gangeticus), also known as the gavial or fish-eating crocodile, is a member of the family Gavialidae, is the most threatened of the two species of crocodilians found in Nepal. However, sufficient information on its habitat characteristics influencing population status, distribution, and threats to its existence are lacking. We studied the gharial population in the Narayani River that was carried out in the winter season during December 2019 to April of 2020. During our surveys, a total of 117 gharials were recorded, including an adult male, 56 adult females, 19 sub-adults, 32 immature and nine were unidentified. The gharial census recorded 57 gharials in Sikrauli-Amaltari (Chitwan branch) river section followed by 14 in Sikrauli-Amaltari (Nawalparasi branch), 16 in Amaltari-Baguwan and 30 in the Baguwan-Tribeni River sections. Of 117 individuals, the number of gharials sighted under the direct observation category was 112. The majority of respondents (129 of 140) during our questionnaire, considered gharial as an important species and displayed a favorable attitude towards gharial conservation. This study concludes that the population of gharial in the Narayani River has increased, as the present population is larger than recorded during previous surveys. Finally, regular surveys and monitoring of gharial in the area are recommended to investigate the status of gharial, the prevalence of any threats and disturbance along the habitat of this important species.
Krishnendu Mondal, Pooja Chourasia, Shilpi Gupta, Kalyanasundaram Sankar, Qamar Qureshi,
Volume 4, Issue 2 (6-2022)
Abstract
In order to understand the generalist nature of leopards and whether they have any degree of specialization, a study on resource selection of the Indian Leopard (Panthera pardus fusca) was carried out in a tropical dry deciduous forest in Sariska Tiger Reserve, Western India from January 2007 to May 2011 with the use of camera trapping under the mark-recapture framework. Camera trapping was done in an intensive study area (230 km2) encompassing 200 camera locations on 85–130 occasions each year. In total, 40 Indian leopards were identified in the study area, of which seven individual leopards were selected for resource selection analysis. Resource selection by Indian leopards was investigated at two scales. First, habitat selection was studied using compositional analysis comparing habitat availability in the geographic range of all seven Indian leopards and utilization by the individual animals within it. The results showed that habitat selection was non-random (P< 0.001). The leopard’s preference of habitat selection was in the following order: Boswellia forest> Anogeissus forest> Acacia forest> Butea forest> Zizyphus forest> Barren land> Scrubland. Second, resource selection was studied through a generalized linear mixed-effect model (GLMM) comparing the resource availability and utilization in each leopard’s range. The results showed that leopards preferred Anogeissus dominated forest followed by Zizyphus mixed forest and scrubland. In addition, leopards preferred habitat with a higher encounter rate of sambar (Rusa unicolor) and chital (Axis axis) and to a lesser degree of use, habitat with a higher livestock encounter rate. The results revealed that Indian leopards showed a significant degree of preference for moderate to thick vegetation cover and wild prey species rather than areas with open forest types and domestic prey species.
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