The spatiotemporal dynamics of habitat use by blacktip (Carcharhinus limbatus) and lemon (Negaprion brevirostris) sharks in nurseries of St. John, United States Virgin Islands

Legare, Bryan; Kneebone, Jeff; DeAngelis, Bryan M.; Skomal, Gregory B.

doi:10.1007/s00227-015-2616-x

Cited by 26 publications

(37 citation statements)

References 56 publications

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“…Indeed habitat preferences have been observed in many different taxa in aquatic ecosystems, for example, freshwater fish in chalk streams (Prenda et al 1997), in marine fish such as gurnards (Lopez-Lopez et al 2011), pipefish (Malavasi et al 2007) and sharks (Ceccarelli et al 2014, Legare et al 2015, and in copepods (Mackas et al 1993). …”

mentioning

confidence: 99%

Two’s company, three’s a crowd: fine-scale habitat partitioning by depth among sympatric species of marine mesopredator

Humphries¹,

Simpson²,

Wearmouth³

et al. 2016

Mar. Ecol. Prog. Ser.

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A sympatric assemblage of morphologically similar predators is expected to exhibit fine-scale habitat segregation, or resource partitioning, to reduce the effects of direct competition. This principle has been well studied for predators in terrestrial ecosystems.In the marine environment, how sympatric species of large predators spatially segregate at the finescale is poorly understood because detailed movement and behavioural data is often not available across multiple species within the same timeframe. How co-occurring congeneric predators separate spatially is even less well understood.Medium sized species of skates (Genus Raja) co-occur in temperate habitats of the north-east Atlantic Ocean, share similar morphologies and have distributional ranges that overlap significantly in the western English Channel ecosystem. Here, detailed depth time series retrieved from 89 electronic data storage tags attached to four species of skate were analysed to determine preferred depth ranges.The four species were found to segregate spatially into two groups, with one group having a significantly shallower core annual depth range than the other. To our knowledge fine-scale segregation by depth has not been observed previously. Interestingly the members of each species group appeared complementary, each group comprising species having different dietary preferences and with a larger and smaller body size.Habitat partitioning in marine predators 2 An understanding of how core depth ranges differ and how these species utilise vertical habitat has potential to predict geographic ranges around the coast with important implications for how these species interact with fisheries and Marine Protected Areas.

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confidence: 99%

Two’s company, three’s a crowd: fine-scale habitat partitioning by depth among sympatric species of marine mesopredator

Humphries¹,

Simpson²,

Wearmouth³

et al. 2016

Mar. Ecol. Prog. Ser.

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“…The higher abundance of juvenile lemon sharks within BSNR is at odds with previous studies on lemon shark nurseries, which have generally found that they associate with mangrove‐fringed shores (Gruber, ; Morrissey and Gruber, ; DeAngelis et al ., ; Legare et al ., ). Studies at Cape Canaveral, USA (Reyier et al ., ), and Atol das Rocas, Brazil (Wetherbee et al ., ), found lemon shark nurseries in areas devoid of mangroves, but the results of the present study are unusual owing to the fact that the sharks utilize such areas when there is abundant mangrove habitat nearby.…”

Section: Discussionmentioning

confidence: 97%

“…The juvenile lemon sharks at Bimini were noted to utilize a narrow expanse of water close to shore, but it was hypothesized that the sharks shift their foraging activities within their home range on a daily basis (Morrissey and Gruber, 1993b). On the other hand, studies at Eleuthera, Bahamas (Murchie et al, 2010) and St. John, US Virgin Islands (Legare et al, 2015), found that although juvenile lemon sharks displayed a high degree of site fidelity, they occasionally undertook more extensive movements, while Reyier et al (2014) observed regional-scale migrations along the south-eastern US coast. Henderson et al (2010) suggested that juvenile lemon sharks around South Caicos might use extensive areas of shallow water, aided by tidal transport, but further studies are required to resolve the matter.…”

Section: Discussionmentioning

confidence: 99%

Assessing the incidental value of a marine reserve to a lemon shark Negaprion brevirostris nursery

Henderson

Jourdan

Bell

2016

Aquatic Conservation

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The lemon shark is a large coastal species that is currently classified as Near Threatened by the International Union for the Conservation of Nature. As juveniles of the species utilize shallow, near shore habitat, they are particularly susceptible to anthropogenic impacts. The abundance, size characteristics, growth, condition factor and movement patterns of juvenile lemon sharks within the Bell Sound Nature Reserve were compared with those outside the Reserve. Sharks were more abundant within the Reserve, which also accommodated a greater proportion of smaller size classes. Although there was no difference in linear growth‐rate between sharks inside and outside the Reserve, those outside exhibited higher condition factor values. It is suggested that these results are due mainly to habitat preference on the part of the sharks, with the predominantly shallower near shore waters of the Reserve offering a greater level of protection from predation. Regardless of the causative factor, the area occupied by the Bell Sound Nature Reserve appears to be highly important to the local juvenile lemon shark population. Copyright © 2016 John Wiley & Sons, Ltd.

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“…Given the irregular boundaries and abundance of islands in Southeast Alaska, a lattice-based density estimator was used to generate estimates of core-(25% density), intermediate-(50% density), and broad-use (95% density) areas of species distribution. Similar methods were used to estimate marine species distributions in other areas with complex shorelines and islands [49,50]. The probability that the random walk stayed in the same location, M, was set in accordance with previous studies to be 0.5 [48,49].…”

Section: Mapping and Evaluating Whale Mapp Datamentioning

confidence: 99%

Obstacles and Opportunities of Using a Mobile App for Marine Mammal Research

Hann

Stelle

Szabo

et al. 2018

IJGI

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Abstract:This study investigates the use of a mobile application, Whale mAPP, as a citizen science tool for collecting marine mammal sighting data. In just over three months, 1261 marine mammal sightings were observed and recorded by 39 citizen scientists in Southeast Alaska. The resulting data, along with a preliminary and post-Whale mAPP questionnaires, were used to evaluate the tool's scientific, educational, and engagement feasibility. A comparison of Whale mAPP Steller sea lion distribution data to a scientific dataset were comparable (91% overlap) given a high enough sample size (n = 73) and dense spatial coverage. In addition, after using Whale mAPP for two weeks, citizen scientists improved their marine mammal identification skills and self-initiated further learning, representing preliminary steps in developing an engaging citizen science project. While the app experienced high initial enthusiasm, maintaining prolonged commitment represents one of the fundamental challenges for this project. Increasing participation with targeted recruitment and sustained communication will help combat the limitations of sample size and spatial coverage. Overall, this study emphasizes the importance of early evaluation of the educational and scientific outcomes of a citizen science project, so that limitations are recognized and reduced.

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The spatiotemporal dynamics of habitat use by blacktip (Carcharhinus limbatus) and lemon (Negaprion brevirostris) sharks in nurseries of St. John, United States Virgin Islands

Cited by 26 publications

References 56 publications

Two’s company, three’s a crowd: fine-scale habitat partitioning by depth among sympatric species of marine mesopredator

Two’s company, three’s a crowd: fine-scale habitat partitioning by depth among sympatric species of marine mesopredator

Assessing the incidental value of a marine reserve to a lemon shark Negaprion brevirostris nursery

Obstacles and Opportunities of Using a Mobile App for Marine Mammal Research

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