Population genetics of the hound needlefish <i>Tylosurus crocodilus</i> (Belonidae) indicate high connectivity in Tanzanian coastal waters

Mgeleka, Said S.; Silas, Mathew Ogalo; Mtonga, Cretus; Rumisha, Cyrus; Viinamäki, Elina; Polte, Patrick; Sköld, Mattias; Winder, Monika; Gullström, Martin

doi:10.1080/17451000.2023.2224026

Cited by 5 publications

(3 citation statements)

References 49 publications

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“…The simultaneous presence of high haplotype diversity, low nucleotide diversity, significant negative Tajima's D values and an unimodal mismatch distribution collectively suggests population expansion. This pattern, which has been previously reported in Barred mudskipper (Polgar et al., 2014) and other marine fauna from the SWIO (Fratini et al., 2016; Mgeleka et al., 2023; Simwanza & Rumisha, 2023), reflects a potential recovery phase from a historical bottleneck, as depicted in the Bayesian skyline plot (Figure 5). However, sustaining this recovery momentum could be jeopardised if measures aren't implemented to counter degradation of estuarine mangroves, which serve as crucial habitats for Barred mudskipper within the region.…”

Section: Discussionsupporting

confidence: 81%

“…Despite the reported losses in mangroves and the potential for this to fragment populations of fauna, there are limited data available on genetic connectivity among populations of mangrove‐associated fishes in the SWIO. Most studies in this region have predominantly focused on corals (van der Ven et al., 2021), coral reef fish (Huyghe & Kochzius, 2017, 2018) and other pelagic fishes (Johnson et al., 2021; Mgeleka et al., 2023), with limited attention given to mangrove‐associated fish. While the few available studies have focused on mangrove snails (Nehemia et al., 2017, 2019; Ratsimbazafy & Kochzius, 2018; Silva et al., 2013) and mangrove crabs (Fratini et al., 2010; Silva et al., 2010), offering signs of genetic isolation resulting from mangrove loss (Nehemia & Kochzius, 2017), specific investigations addressing mangrove‐associated fish remain notably scarce.…”

Section: Introductionmentioning

confidence: 99%

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Transcending borders: Remarkable genetic homogeneity among Barred mudskipper (Periophthalmus argentilineatus) populations in the southwestern Indian Ocean

Rumisha

2024

Afr J Ecol

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In the past 24 years, the Southwestern Indian Ocean (SWIO) region has lost about 4% of its mangroves due to unsustainable extraction, land clearance for agriculture and climate change impacts. Since this loss risks fragmenting mangrove fauna, this study analysed 179 D‐loop sequences (329 base pairs) of Barred mudskipper (Periophthalmus argentilineatus) sampled from estuarine mangroves in the SWIO to test two hypotheses: (1) whether Barred mudskipper populations in the region display genetic connectivity along the fragmented mangroves and (2) whether these populations have experienced demographic declines in recent history. The populations showed low and insignificant indices of genetic differentiation (FST = −0.00068, p > 0.05; ΦST = 0.005, p > 0.05), and haplotypes from different localities did not cluster according to their geographical origins. Similarly, Bayesian phylogenetic analysis grouped all SWIO haplotypes into one cluster, suggesting the hypothesis of genetic interconnectedness could not be rejected. Furthermore, the populations showed high haplotype diversity (0.96 ± 0.007) combined with low nucleotide diversity (1.09 ± 0.61%). They also showed significant negative Tajima's D values (−1.71, p < 0.02) and a unimodal mismatch distribution, indicating the hypothesis of demographic expansion post a historical bottleneck could not be rejected. Nevertheless, the Bayesian skyline plot indicated an increase in population size post‐bottleneck, suggesting an ongoing recovery. These findings indicate that, despite varying management approaches in the SWIO, Barred mudskipper populations exhibit genetic exchange that transcends geographical and administrative borders. This implies that their populations should be considered a single stock within the region. These findings underscore the need for coordinated management approaches among the SWIO countries. This is crucial because inconsistencies in conservation measures across borders could disrupt the population's interconnectedness, potentially impacting their genetic integrity and long‐term survival.

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Section: Discussionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Transcending borders: Remarkable genetic homogeneity among Barred mudskipper (Periophthalmus argentilineatus) populations in the southwestern Indian Ocean

Rumisha

2024

Afr J Ecol

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“…Edited COI sequences were then translated into amino acid sequences using the vertebrate genetic code in MEGA ver. 11 to check for the presence of sequencing artifacts and nuclear pseudogenes (Mgeleka et al, 2023; OR138542-OR138668 and OR759455-OR759484. Sequences were then collapsed into haplotypes using FaBox DNA collapser ver.…”

Section: Discussionmentioning

confidence: 99%

Restricted genetic connectivity and conservation prospects of Bagrid catfish, Bagrus orientalis, populations in the Rufiji River basin, Tanzania

Saiperaki,

Materu,

Mkenda

et al. 2024

Fisheries Management Eco

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The Bagrid catfish, Bagrus orientalis, historically sustained communities in the Rufiji River basin (RRB), Tanzania, but has rapidly declined due to high consumer demand and unsustainable fishing. Consequently, a Ramsar site was designated within the RRB, although its potential to revitalize overexploited populations beyond its boundaries is uncertain because of limited information on genetic connectivity. To address this uncertainty, 158 partial cytochrome oxidase subunit I sequences of B. orientalis were analyzed to quantify genetic connectivity in the RRB. We observed significant genetic differentiation, indicating limited connectivity among populations. Populations in the Ramsar site were genetically connected to those in the Kilombero Valley Floodplain (KVFP), but were distinct from those in Ruaha and Rufiji, which clustered separately. Our findings suggested the Ramsar site could revitalize overexploited KVFP populations, and emphasized the need for sustained efforts against its encroachment. However, limited genetic connectivity with Ruaha and Rufiji implied that conservation measures in the site might have restricted effect in these areas. Conservation efforts should extend beyond the Ramsar site, by promoting sustainable fishing and enhancing habitat connectivity in Ruaha and Rufiji.

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Devils in distress: Insights into the composition and genetic population structure of devil rays landed in the Southwestern Indian Ocean

Rumisha,

Barongo,

Saiperaki

et al. 2024

Regional Studies in Marine Science

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Population genetics of the hound needlefish Tylosurus crocodilus (Belonidae) indicate high connectivity in Tanzanian coastal waters

Cited by 5 publications

References 49 publications

Transcending borders: Remarkable genetic homogeneity among Barred mudskipper (Periophthalmus argentilineatus) populations in the southwestern Indian Ocean

Transcending borders: Remarkable genetic homogeneity among Barred mudskipper (Periophthalmus argentilineatus) populations in the southwestern Indian Ocean

Restricted genetic connectivity and conservation prospects of Bagrid catfish, Bagrus orientalis, populations in the Rufiji River basin, Tanzania

Devils in distress: Insights into the composition and genetic population structure of devil rays landed in the Southwestern Indian Ocean

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