striped dolphin facts

Published by on November 13, 2020

ACCOBAMS-ECS-WK Threats (2017) Inputs to the ACCOBAMS ongoing effort to map human threats on Cetaceans in the Mediterranean and Black Seas. Its fusiform body is robust but able to perform graceful movements. In this case, they hunt these dolphins for human consumption. Most of the boats are registered as polyvalent fishing vessels, because they often change type of gear, according to the season and sea/weather conditions, as well as the variable availability of resources and market demand. These dolphins travel in groups, typically numbering from a few dozen to 500 or more individuals. PLoS ONE 7(9):44509. https://doi.org/10.1371/journal.pone.0044509, D’Onghia G, Maiorano P, Sion L, Giove A et al (2010) Effects of deep-water coral banks on the abundance and size structure of the megafauna in the Mediterranean Sea. The striped dolphin is the target of some fisheries that seek to get their meat or keep them away from the boats, as the cetacean can approach to “steal” fish. 2013. The consumption flows of the odontocetes within the GoT food web represented less than 1% of the total consumption. Also, it is in the Agreement on the Conservation of Small Cetaceans in the Baltic, North East Atlantic, Irish and North Seas (ASCOBANS). https://doi.org/10.1016/j.dsr2.2016.02.012, D’Onghia G, Maiorano P, Carlucci R et al (2012) Comparing deep-sea fish fauna between coral and non-coral “Megahabitats” in the Santa Maria di Leuca cold-water coral province (Mediterranean Sea). As the name indicates, these dolphins have an identifiable striped pattern on their body. Below is the link to the electronic supplementary material. In addition, dolphin species could show different interactions with the fishing gears, such as in the case of T. truncatus and S. coeruleoalba with trawling in the Gulf of Taranto (Carlucci et al. The goal of this study is to provide new information on the ecological role of the cetaceans and to assess the cetacean-fishery interactions in the Gulf of Taranto (Northern Ionian Sea, Central Mediterranean Sea) through a food web modelling approach based on Ecopath with Ecosim (EwE) (Christensen et al. On the other hand, the striped dolphin was the main impact on the food web due to its highest consumption flows. 2014). PubMed Central  The negative fishing impacts showed a condition of non-selected impacts within the investigated food web on the species grouped at trophic levels III, IV and V, with a consequent loss of secondary production. Publications Office of the European Union, Luxembourg, EUR 27758 EN, JRC 101548, pp 483, STECF (2013) Scientific, Technical and Economic Committee for Fisheries, 2013. Although the direct link between the gear damage and the occurrence of cetaceans in the fishing areas is highly uncertain, cetaceans have been too often depicted as the fishermen’s “enemies” (Kaschner and Pauly 2005). Nevertheless, it is on the Red List of the International Union for the Conservation of Nature (IUCN) as “Least Concern.”. The exploitation of fishery resources acts as a driving force on cetaceans both directly, by determining their fishing mortality or injury as by-catch species, and indirectly, through the lowering the availability of their prey. Similarly to the estimations obtained from analogous indicators (Trites et al. What has been noted is that without conservation tactics then their numbers could be threatened in as little as 5 years. 2007; Moutopoulos et al. The area just above the side stripe is bluish or light gray and creates a contrasting shoulder blaze that curves back and up toward the animal's dorsal fin. Overfishing, contamination of their habitat and noise pollution complete the range of threats. Several factors could explain the reduced competition for resources, especially among the striped dolphin, Risso’s dolphin and sperm whale with all the fishing gears. In particular, the OTB gear showed the highest F percentage (45.9%), while the lowest was estimated for the PS gear (0.3%). This can be explained by the large energy costs required from the food web to sustain the resident cetacean population that is larger for S. coeruleoalba than for the other odontocetes. According to ecosystem-based fisheries management (Jusufovski et al. The Gulf of Taranto includes a complex set of coastal and offshore habitats among which the deep cold-water coral province offshore from Santa Maria di Leuca (SML CWC) and the Amendolara shoal (Capezzuto et al. J Mar Syst 148:183–199, Dimatteo S, Siniscalchi M, Esposito L, Prunella V, Bondanese P, Bearzi G, Quaranta A (2011) Encounters with pelagic and continental slope cetacean species near the northern shore of the Gulf of Taranto. 2014). It is the striking body pattern that gives it its name. 2011a). Whilst, on the other hand, cetaceans ensure the stability of marine food webs as keystone species (Roman et al. Ecol Model 172(2–4):109–139, Civitarese G, Gacic M, Lipizer M, Eusebi Borzelli GL (2010) On the impact of the Bimodal Oscillating System (BiOS) on the biogeochemistry and biology of the Adriatic and Ionian Seas (Eastern Mediterranean). Biogeosciences 7:3987–3997, CAS  Article  Its distribution range is between latitudes 50° north and 50° south. Google Scholar, Azzolin M, Arcangeli A, Cipriano G, Crosti R, Maglietta R, Pietroluongo G, Saintignan S, Zampollo A, Fanizza C, Carlucci R (2020) Spatial distribution modelling of striped dolphin (Stenella coeruleoalba) at different geographical scales within the EU Adriatic and Ionian Sea Region, central-eastern Mediterranean Sea. Mating seasons differ between regions. The diet and catch composition were expressed as percentages and the index was calculated as: where Pji and Cki are the proportions of the resource i consumed by odontocetes species j and fishing gear k, respectively. 2014). J Mar Biol Ass UK 89(5):921–929, Libralato S, Coll M, Tempesta M, Santojanni A, Spoto M, Palomera I, Solidoro C (2010) Food web traits of protected and exploited areas of the Adriatic Sea. 2017). The mean predation mortality rate (PM) estimated for the cetaceans represented 3.6% of the total PM within the food web. 2019). Other name: Whitebelly; Blue-white dolphin; Meyen's dolphin; Streaker porpoise In fact, the reduction of the nominal fishing effort process starting from the end of the 1990s on the small scale fishery in the Northern Ionian Sea could suggest a progressive lowering of the probability of interactions between the common bottlenose dolphin and nets (Piroddi et al. https://doi.org/10.5194/bg-9-217-2012, Lassalle G, Chouvelon T, Bustamante P, Niquil N (2014) An assessment of the trophic structure of the Bay of Biscay continental shelf food web: comparing estimates derived from an ecosystem model and isotopic data. Striped dolphins are known for their distinct and striking coloration pattern, which includes bold, thin stripes that extend from the eye to the flipper and another set of stripes down the side of the body to the anal region. 2011; Spitz et al. https://doi.org/10.1371/journal.pone.0043966, Morissette L, Kaschner K, Gerber LR (2010) ‘Whales eat fish’? 2019). 1998; Kaschner et al. Marine Mammals of the World: A Comprehensive Guide to Their Identification. PubMed Central  No Comments; 1; 0. The striped dolphins have a characteristic way of travelling very quickly, making long shallow leaps above the water and frequently changing direction. The striped dolphin is a marine mammal which means it breathes air, is warm-blooded, produces milk to feed its children and gives birth to live dolphins (rather than laying eggs). The underside of the body is white to pinkish and much lighter than the rest of the body. The fin whale showed negligible niche overlapping with the odontocetes in the area because its feeding is based on the macro-zooplankton group. The Risso’s dolphin and sperm whale showed the highest TLs in the Gulf of Taranto trophic-web due to their preferential predation on the medium and large squids, which occupy the TLs > 3. 2016). 33–37, Blanco C, Raduán AM, Raga JA (2006) Diet of Risso’s dolphin (Grampus griseus) in the western Mediterranean Sea. An overfishing condition was estimated for the main commercial species (hake, red mullet, anglers and deep-water shrimps) by the EwE model in the Gulf of Taranto which was confirmed by independent stock assessment analyses performed for the Northern Ionian Sea (STECF 2016). Consequently, in the past, inappropriate solutions to mitigate possible conflicts were adopted, and the intentional culling of cetaceans was unfortunately applied to maximize fishery production (Gerber et al. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. Publications Office of the European Union, Luxembourg, EUR 26614 EN, JRC 89860, pp 364, Trites AW, Christensen V, Pauly D (2006) Effects of fisheries on ecosystems: just another top predator? Deep Sea Res II Top Stud Oceanogr 145:87–101.

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