Heart rate responses to different temperatures in juvenile Poppiana dentata ( )

Abstract

<jats:p>Abstract Temperature is one of the main factors that influences cardiovascular functioning in ectotherms. Hence this study sought to investigate heart rate responses of a freshwater crab species, Poppiana dentata, to different temperature exposures since the species generally reside in habitats of fluctuating physicochemistry. Heart rates were non-invasively determined in juvenile crabs for three temperature regimes, each over an 8-day session; A: temperature exposures of 26 °C (2 days) to 30 °C (3 days) to 26 °C (3 days), B: 26 °C (2 days) to 32 °C (3 days) to 26 °C (3 days) and C: a control at constant 26 °C. Heart rate variations were significant among the regimes (P &lt; 0.05), with the median heart rate being highest for regime B (74 beats per minute or bpm) during the temperature insult (32 °C), relative to regime A (70 bpm) and the control (64 bpm). Notably, a suppression and inversion of the diurnal cardiac patterns occurred for regimes’ A and B crabs respectively, with rates from the highest temperature insult not shifting back to pre-insult levels during recovery (26 °C). It is plausible that P. dentata may have compensatory cardiovascular mechanisms that account for these differential heart rate responses, possibly conveying adaptive strategies in its dynamic habitat conditions.</jats:p>

Anaesthesia of decapod crustaceans

“… Species Beats per minute Acardia time Condition Refs. Crab Cancer irroratus Say, 1817 91.0 ± 0.9 59.6 ± 7.2 s Unrestrained McGaw & Nancollas, 2021 Cancer maenas Linnaeus, 1758 79.3 ± 1.2 27.6 ± 0.9 s Cancer magister Dana, 1852 91.8 ± 1.3 28.5 ± 2.1 s Cancer gracilis Dana, 1852 65.6 ± 1.4 46.4 ± 2.8 s Cancer productus Randall, 1840 99.0 ± 1.2 83.8 ± 5.1 s Poppiana dentata Randall, 1840 83.0 ± 28.0 26° – 32 °C † 74.0 ± 14.0 26° – 30 °C † 70.0 ± 16.0 26 °C † N/C Unrestrained Singh et al., 2019 Lobster Homarus ammericanus Edwards, 1837 54.0 ± 13.0 Resting 90.0 ± 5.0 Exercising N/C Unrestrained Guirguis & Wilkens, 1995 Panulirus japonicus von Siebold, 1824 82.2 ± 12.6 5 – 15 min 13.8 ± 4.84 BPM Resting Unrestrained Yazawa & Katsuyama, 2001 103.2 ± 19.8 N/C Restrained Crayfish Cherax destructor Clark, 1936 85.27 ± 7.41 20 °C † 141.61 ± 7.98 30 °C † N/C Unrestrained Goudkamp et al., 2004 Procambarus clarkia Girard, 1852 90.0 ± 31.2 ‡ N/C Unrestrained Bini & Chelazzi, 2006 …”

Sublethal effects of malathion insecticide on growth of the freshwater crab Poppiana dentata (Randall, 1840) (Decapoda: Trichodactylidae)

“…To date, there is no information on the effects of OP pesticides on the freshwater crab species, native to Trinidad. Poppiana dentata (Randall, 1840) is one of only three freshwater, indigenous crab species reported for Trinidad (Singh et al, 2020a) and its lifecycle is spent mainly in the freshwater environment, living and feeding in close proximity to the water and benthic sediments where pesticides can reside. Organophosphates, like malathion, are toxic to freshwater species (Pham, 2017), so there is a need for investigating the exposure risk faced by nontarget biota, residing in contaminated aquatic habitats.…”

Exploration of the regulatory mechanisms of regeneration, anti-oxidation, anti-aging and the immune response at the post-molt stage of Eriocheir sinensis

“…Their heart rate had strong dependence to temperature. Their heart rhythm stability was better than polyric rhythm under high temperature condition ( Kushinsky et al, 2019 ; Zainal and Noorani, 2019 ; Singh et al, 2020a ; Singh et al, 2020b ; Levinton et al, 2020 ). In contrast to vertebrates, the hearts of crustaceans have strong regenerative potential.…”

“…As one of the critical organs and a core component of the circulatory system, the heart plays an important role in various life activities such as development and reproduction ( Goepel and Wirkner, 2020 ). Currently, only a few studies have been published on the heart in crabs and these involve the influence of different environmental factors such as hypoxia and temperature on the heart rate ( Kushinsky et al, 2019 ; Zainal and Noorani, 2019 ; Singh et al, 2020a ; Singh et al, 2020b ; Levinton et al, 2020 ). The results indicated that crab performed cardiac compensation in response to declining dissolved oxygen.…”