Behavioral patterns of two fiddler crab species Uca rapax and Uca tangeri in a seminatural mangrove system

Abstract

Zoos increasingly transform their exhibitions from traditional one‐species enclosures to more natural exhibits, that is, environments that capture part of an ecosystem including a selection of animals and plants that occur there. Thus, enhancing the experience of its human visitors while also allowing its residents to possibly show more natural behavior. In 2017 Royal Burger's Zoo (Arnhem, The Netherlands) created and opened a mangrove‐like environment containing fiddler crabs. Fiddler crabs display a broad range of behaviors, and this research examines which wild‐type behavior and behavioral patterns can be observed on a seminatural mudflat. The behavior shown by Uca rapax and Uca tangeri on the mudflat was counted each hour between 07:00 and 17:00. An asymmetric tidal regime was present in the enclosure including two high water periods. Various known fiddler crab behaviors, including waving and combat, were observed but no copulation. A clear pattern in exposed crabs on the mudflat was found, with low numbers visible in the early morning and the highest numbers present in the early afternoon, while number of visitors did not have a significant effect on this pattern. Interestingly, the highest abundances were not observed around the ebbing tide (07:00–09:00), as observed in the wild, but somewhat later, possibly due to the asymmetric tidal scheme or the interaction of tidal and daily rhythms. This study shows that in captivity, fiddler crabs indeed show a range of natural behaviors which is linked to the tidal and possibly daily rhythm as well.

Improved support vector machine algorithm based on the influence of Gestational Diabetes Mellitus on the outcome of perinatal outcome by ultrasound imaging

“…Pre-exposed abnormality refers to pre-exposed pre-existing abnormalities including breech and lateral position, excluding occipital abnormalities at birth, such as persistent lateral and posterior occipital positions. 12,13 Ultrasound examination. Using E8 color ultrasound Doppler ultrasound diagnostic equipment from the US company GE, the probe frequency is 2.5 to 3.5 MHz Obstetrical conditions were adopted.…”

“…Pre-exposed abnormality refers to pre-exposed pre-existing abnormalities including breech and lateral position, excluding occipital abnormalities at birth, such as persistent lateral and posterior occipital positions. 12 , 13 …”

Behavior and activity pattern of Minuca osa (Brachyura: Ocypodidae) from Ponuga, Veraguas, Panama

“…Discrete behavior elements were recorded during field trips based on descriptions in the specialized literature (Crane, 1966(Crane, , 1975Christy and Salmon, 1984;Caravello and Cameron, 1987;Tina et al, 2019;van Himbeeck et al, 2019). To further capture behavior without observer effects, two ground level cameras (Casio, 26mm, 1:2.8-6.5) were placed near active burrow entrances to record video of M. osa individuals.…”

Biodiversitas Gastropoda dan Krustasea di Zona Intertidal Hutan Mangrove Estuari Sungai Musi, Sumatera Selatan

“…Kelompok gastropoda dan krustasea telah dipelajari banyak terkait sifat hidupnya. Keduanya cenderung memiliki perilaku berbeda ketika dihadapkan pada kondisi lingkungan pasang surut ( Van-Himbeeck et al, 2019;Reis et al, 2021). Di kondisi surut, kedua kelompok makrozoobentos ini menyukai permukaan subsrat lumpur, namun ketika pasang mereka beradaptasi dengan caranya sendiri.…”