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Gastropod Community Structure as Environmental Change Signals for Tropical Status in Sedati Waters, Indonesia

Melati Vivy Hanum, Sari Luthfiana Aprilianita, Cahyoko Yudi, Arsad Sulastri, Pursetyo Kustiawan Tri, Dewi Nina Nurmalia, Idris Mohd. Hanafi

Ecological Engineering & Environmental Technology

2021

Vol. 22, iss. 3

82--90

Sedati is one of the Sidoarjo Regency's Coastal Areas, which has potential resources in capture fisheries. Many industries in Sedati have caused a decrease in the aquatic productivity and aquatic organism conditions, including gastropods. Gastropods are easy to find in various habitats, but their distribution is highly dependent on the habitat conditions such as physical, chemical and biological factors. Gastropods are sensitive to environmental changes and can withstand the environmental changes that are not too wide to be used as indicators of environmental pollution. This study aims to determine the structure of the gastropod community in the Sedati Waters. The research was performed using an observation method. The gastropod samples were taken using a dredge net, while the substrate samples were collected using Ekman grab. The gastropods found in Sedati Waters from October to December are nine species from 2 orders and six families. The species most commonly found in R. venosa, while the least is C. ventricosa. The abundance index of gastropods every month shows a marked difference between stations but not the other main parameters. The diversity index value was between 1.4846–2.0897. The evenness index value reached between 0.8284 and 0.9548. The dominance index ranged from 0.16 to 0.2299. The community structure of gastropods in the Sedati Waters, Sidoarjo, East Java shows a significant difference (p<0.05) between stations and belongs to the medium category.

Predicting the Potential Impacts of Trophy Hunting on Population Structure of Himalayan Ibex (Capra sibirica) in Northern Pakistan

Khan Muhammad Zafar, Begum Farida, Riaz Muhammad, Khan Babar, Karim Rehmat, Ali Karamat, Aman Safina

Polish Journal of Ecology

2019

Vol. 67, nr 3

264--270

We compared population structure and trophy hunting statistics of Himalayan ibex (Capra sibirica) in two community-controlled hunting areas (CCHAs) of northern Pakistan with varying duration of trophy hunting and isolated populations of C. sibirica. Based on fixed-point direct count method during winter 2016-2017, 939 ibexes were counted in Khyber and 346 in Hussaini, with a density of 7.5 and 3.2 animals km-2, respectively. Though the populations of C. sibirica at both the study sites have increased compared to the past estimates, we found variations in population structures and horn sizes, presumably as a result of trophy hunting. The sex ratios are skewed toward females in Khyber (87 males/100 females) and towards males in Hussaini (115 males/100 females). The trophy size males were 7% of the population in Khyber and 11% in Hussaini. Mean group (herd) size in Khyber was 28 (range = 1-117) and Hussaini was 20 (range = 1-79). Mean horn size of the trophies harvested in Khyber was 102 cm (± range = 91-114) compared to 108 cm (range = 99-121) in Hussaini. Stringent regulatory measures are suggested to determine the number of permits.