Malcolm John Smale

Revisiting the description of Atractoscion macrolepis (Perciformes: Sciaenidae): Another argument for comprehensive taxonomy

Gavin Gouws, Jerraleigh L Kruger, Malcolm John Smale, Romina Henriques et autres

Afrique du Sud (code pays fourni par la source)

Feeding down the food web?! Trophic cascading reflected in the long-term dietary trends of endangered Indian Ocean humpback dolphins Sousa plumbea from KwaZulu-Natal, South Africa

Natasha Roussouw, Pierre William Froneman, Kay Weltz, Kirsty Venter et autres

• Sousa plumbea is a good indicator species for the coastal zone of the Indian Ocean. • A multi-method approach investigated long-term dietary trends (1972–2017). • Stomach contents and δ 13 C isotope signatures showed a diet shift over time. • Significant …

de, Afrique du Sud (code pays fourni par la source)

Global tracking of marine megafauna space use reveals how to achieve conservation targets

Ana M. M. Sequeira, Jorge P. Rodríguez, Sarah A. Marley, Hannah J. Calich et autres

The recent Kunming-Montreal Global Biodiversity Framework (GBF) sets ambitious goals but no clear pathway for how zero loss of important biodiversity areas and halting human-induced extinction of threatened species will be achieved. We assembled a multi-taxa tracking dataset (11 million geopositions from …

au, es, gb, us, ch, pt, fr, mx, no, se, pe, ae, qa, in, Kenya, ca, fk, ie, sa, br, re, ar, gt, bs, is, it, pf, nz, Afrique du Sud, nc, be (code pays fourni par la source)

Revisiting the description of Atractoscion macrolepis (Perciformes: Sciaenidae): Another argument for comprehensive taxonomy

Gavin Gouws, Jerraleigh L Kruger, Malcolm John Smale, Romina Henriques et autres

Atractoscion macrolepis was described as a species separate to A. aequidens, distinguished by a geographically-separated distribution, genetic evidence and a diagnostic meristic character: the number of pored lateral line scales. However, the distinction of these species and description of A. macrolepis were …

Afrique du Sud (code pays fourni par la source)

Marine predators segregate interspecifically by space and time in a sheltered coastal bay

Taryn S. Murray, Chantel Elston, Malcolm John Smale, A-R Childs et autres

Marine predators are vital to the healthy functioning of coastal ecosystems, but to understand their roles, it is necessary to elucidate their movement ecology, particularly in relation to one another. A decade's worth of acoustic telemetry data (2011-2020) from Algoa Bay, South …

Afrique du Sud, us (code pays fourni par la source)

Movement and growth of the spotted gully shark Triakis megalopterus in South African waters

BQ Mann, GL Jordaan, WN Dalton, Ryan Daly et autres

The movement and growth of spotted gully sharks Triakis megalopterus (family Triakidae) along the coast of South Africa were investigated using external dart tagging. Of a total of 7 211 sharks tagged, 657 (9.1%) were recaptured over a 37-year period, from 1984 …

Afrique du Sud (code pays fourni par la source)

Further insights into killer whales Orcinus orca preying on white sharks Carcharodon carcharias in South Africa

Alison V. Towner, Primo Micarelli, David Hurwitz, Malcolm John Smale et autres

Photography and video footage, captured by researchers and tourists on board two vessels, provided insights into the predation techniques employed by an adult male killer whale Orcinus orca in Mossel Bay, South Africa. The incapacitation of its prey, a juvenile white shark …

Afrique du Sud, it, us (code pays fourni par la source)

Stomach contents analysis of Tursiops aduncus and Sousa plumbea stranded along the United Arab Emirates coastline

Razan Alkhamis, Malcolm John Smale, M. Beech, Robert L. Brownell et autres

The Indo-Pacific bottlenose dolphin (Tursiops aduncus) and the Indian Ocean humpback dolphin (Sousa plumbea), previously reported as Sousa chinensis (Mendez et al., 2013) are among the resident small cetacean species inhabiting the United Arab Emirates (UAE) and broadly the Arabian/Persian Gulf coastal …

ae, Afrique du Sud, us (code pays fourni par la source)

Highly conserved tooth morphology in allopatric elasmobranch populations despite contrasting diets—a case of Triakis megalopterus in southern Africa

Michelle Soekoe, Malcolm John Smale, Warren Mason Potts

Afrique du Sud (code pays fourni par la source)

Sex and Size Influence the Spatiotemporal Distribution of White Sharks, With Implications for Interactions With Fisheries and Spatial Management in the Southwest Indian Ocean

Alison A. Kock, Amanda Talita Lombard, Ryan Daly, Victoria Goodall et autres

Human activities in the oceans increase the extinction risk of marine megafauna. Interventions require an understanding of movement patterns and the spatiotemporal overlap with threats. We analysed the movement patterns of 33 white sharks (Carcharodon carcharias) satellite-tagged in South Africa between 2012 …

Afrique du Sud, au, gb (code pays fourni par la source)

Fear at the top: killer whale predation drives white shark absence at South Africa’s largest aggregation site

AV Towner, RGA Watson, Alison A. Kock, Yannis P. Papastamatiou et autres

Risk-induced fear effects exerted by top predators are pervasive in terrestrial and marine systems, with lasting impacts on ecosystem structure and function. The loss of top predators can disrupt ecosystems and trigger trophic cascades, but the introduction of novel apex predators into …

Afrique du Sud, us, gb (code pays fourni par la source)

Satellite tracking data of white sharks in the southwest Indian Ocean (2012-2014)

Alison A. Kock, Amanda Talita Lombard, Ryan Daly, Victoria Goodall et autres

These data comprise locations and individual metadata from 34 white sharks (Carcharodon carcharias) instrumented March-May 2012 with telemetry devices along the coast of South Africa. These devices were SPOT5 transmitters (SPOT-257, SPOT-258; Wildlife Computers) which transmit locations via ARGOS CLS. All research …

Afrique du Sud, fr, us, au, gb (code pays fourni par la source)