First report on the occurrence of Avicennia marina (Forssk.) Vierh. (Acanthaceae) in the Nicobar archipelago

Thirumurugan, Vedagiri; Singh, Anoop Raj; Prabakaran, Nehru

doi:10.1590/2675-2824070.21077vt

Cited by 4 publications

(12 citation statements)

References 23 publications

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“…Also, the mid-zone habitat is aggressively used by Grapsid crabs that profusely predate on the propagules of Avicennia species limiting the regeneration of Avicennia stand in the mid-zone (Smith, 1987). Hence, the formation of new intertidal habitat at the landward zone in subsided sites and seaward zone in the uplift site due to coastal subsidence and uplift across the ANI's becomes the perfect habitat for Avicennia to colonize (Thirumurugan et al ., 2022).…”

Section: Discussionmentioning

confidence: 99%

“…This species is also observed by the authors to form monodominant stands in the mangroves along the seaward zones across the eastern coast of India (e.g., Sundarbans, Bhitarkanika, Coringa). Therefore, the presence of A. alba is arguably recent in the ANI's, like Sonneratia ovata (Nehru and Balasubramanian, 2012), A. marina (Thirumurugan et al ., 2022) and Aegiceras corniculatum (Thirumurugan et al ., 2023) in the Nicobar Islands. However, A. alba is expected to spread faster in the seaward zones of the new intertidal habitat and soon establish monodominant stands over the course of mangrove succession.…”

Section: Discussionmentioning

confidence: 99%

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Distribution of Avicennia spp. in the Andaman and Nicobar Islands with special reference to new distributional reports and post-tsunami colonization patterns

Singh,

Thirumurugan,

Prabakaran

2024

J. Mar. Biol. Ass.

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Post 2004 tsunami and earthquake, the landmass of Andaman and Nicobar Islands (ANI's) experienced uplift (North Andaman and Mayabunder) and subsidence (South Andaman & Nicobar Islands). The altered geomorphology modified the tidal regime, which resulted in mangrove degradation in their current locations and the formation of new intertidal zones potential for mangrove colonization. Avicennia species; a pioneer in mangrove succession was expected to colonize such new intertidal zones. Therefore, to understand the colonization pattern of Avicennia species in these new intertidal zones and their distribution in the old forests, we surveyed 79 sites across ANI's (55 Andaman and 24 Nicobar Islands). Our survey confirms the presence of three Avicennia species namely A. marina, A. officinalis, and A. alba – a new distribution record to the ANI's. Further, A. marina was found to be the most widely distributed, and abundant among three Avicennia species (Relative Abundance (RA) – 97.92%; Relative Frequency (RF) – 68.75%). In contrast, A. officinalis (RA – 1.93%; RF – 26.25%) and A. alba (RA – 0.16%; RF – 5%) were found limited in their distribution and abundance. As per the IUCN Red List, the Avicennia population is decreasing globally, whereas, its population may increase significantly across ANI's due to the availability of vast new intertidal zones. Hence, Avicennia spp. can be utilized in the plantation programs to facilitate rapid colonization in the unvegetated potential mangrove habitats across ANI's. Such an effort will improve the mangrove ecosystem services that were hampered due to mangrove degradation by the 2004 tsunami.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Distribution of Avicennia spp. in the Andaman and Nicobar Islands with special reference to new distributional reports and post-tsunami colonization patterns

Singh,

Thirumurugan,

Prabakaran

2024

J. Mar. Biol. Ass.

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“…Woody plants usually form dense bush canopy as an adaptive strategy to increase their survival chances against herbivory pressure (Bee et al, 2007;Hoppe-Speer, 2012;Hoppe-Speer and Adams, 2015;Thirumurugan et al, 2022). Such a characteristic was especially observed among Lumnitzera racemosa, which is one among the dominant species in the landward zone.…”

Section: Discussionmentioning

confidence: 99%

“…The 2004 Sumatra-Andaman earthquake (9.3 Moment magnitude) and the subsequent Indian Ocean tsunami had a profound impact on the coastal ecology and biodiversity across the Andaman and Nicobar Islands (Porwal et al, 2012;Nehru & Balasubramanian, 2018;Thirumurugan et al 2022). Notably, the mangroves in these islands faced substantial challenges due to high-intensity tsunami waves, and land drowning or uplift due to tectonic slip (Nehru & Balasubramanian, 2018;Shiva Shankar et al 2020).…”

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confidence: 99%

“…km) loss of mangrove cover in South Andaman (Saxena et al, 2012;Shiva Shankar et al 2020). Meanwhile, the subsidence also created new intertidal zones on the former terrestrial zones, which subsequently supported mangrove colonization (Nehru & Balasubramanian, 2018;Thirumurugan et al, 2022;Prabakaran et al, 2021). However, the natural recovery of the mangroves in the subsided sites of Andaman Islands is challenged by several natural (eg.…”

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Impacts of invasive spotted deer (Axis axis) herbivory on mangrove vegetation in South Andaman Island, India

Thirumurugan,

Singh,

Karattuthodi

et al. 2024

JWLS

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The invasion of spotted deer (Axis axis) in the Andaman Islands, India, is a serious concern for the native flora and fauna of this insular ecosystem. We assessed how invasive spotted deer herbivory is affecting the regeneration and vegetation composition in the mangrove forest of the South Andaman Islands by comparing sites with and without herbivory pressure. Vegetation data was collected across 18 sites (ten sites with herbivory in the Mahatma Gandhi Marine National Park, and eight sites without herbivory (control) in South Andaman). We used circular plots (7m radius) along linear transects for data collection (125 plots each for herbivory site and control site). The results highlighted a strong influence of herbivory on mangrove vegetation and the impacts varied across the three mangrove zones (landward, ecotone, and seaward). Control sites consistently exhibited higher species richness and abundance across all categories (tree, sapling, and seedling) except for seedling abundance. Herbivory disturbance varied significantly along the three zones, (p < 0.05) with the landward zone being the most affected, followed by ecotone to seaward zones. Invasive spotted deer herbivory altered the vegetation structure and recruitment, especially in landward mangroves, leading to shifts in mangrove distribution and the emergence of the least palatable Ceriops tagal as the dominant species. Management and policy-level interventions are an immediate requirement for the removal of invasive spotted deer in the Andaman Islands for conserving mangroves and marine natural resources unique to the island ecosystem.Invasive species significantly threaten local biodiversity, disrupt ecological functions, and outcompete native species (Mooney & Hobbs, 2000;Courchamp et al., 2003;Beltran et al., 2014). This negative interplay could lead to cascading impacts such as habitat loss, soil erosion, nutrient loss, reduced recruitment opportunity, and degradation of the whole ecosystem (Simberloff, 2011;Beltran et al., 2014;Russell et al., 2017). Particularly, the introduction of invasive herbivores can lead to changes in vegetation composition and a decline in species richness in the long term (Coomes et al., 2003;Webster et al., 2005). For instance, the invasive ungulate (Sus scrofa Linnaeus, 1758) introduced in the Great Smoky Mountains National Park, USA, altered the native vegetation through predation, habitat damage, competition, and disease transmission (Webster et al., 2005;McClure et al., 2018). The impact of invasive herbivory species on the island ecosystem is especially detrimental as most of the island species have evolved without intense competition due to herbivory and predation (

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Monitoring the Mangrove Colonization on the Uplifted Reef Beds in the North Andaman Island, India

Singh,

Thirumurugan,

Prabakaran

2024

Ocean Sci. J.

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First report on the occurrence of Avicennia marina (Forssk.) Vierh. (Acanthaceae) in the Nicobar archipelago

Cited by 4 publications

References 23 publications

Distribution of Avicennia spp. in the Andaman and Nicobar Islands with special reference to new distributional reports and post-tsunami colonization patterns

Distribution of Avicennia spp. in the Andaman and Nicobar Islands with special reference to new distributional reports and post-tsunami colonization patterns

Impacts of invasive spotted deer (Axis axis) herbivory on mangrove vegetation in South Andaman Island, India

Monitoring the Mangrove Colonization on the Uplifted Reef Beds in the North Andaman Island, India

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