#FourNewSpeciesOfTropicSharksDiscovered; #WalkingSharks; #NorthernAustralia; #NewGuinea;
Queensland (Australia), Jan 24 (Canadian-Media): The discovery of four new species of tropical sharks in waters that use their fins to walk off northern Australia and New Guinea caused fear and worry to small fish and invertebrates, University of Queensland (UQ) in Australia research reports said.
Walking sharks. Image credit: phys.org
It wa during a 12-year study with Conservation International, the CSIRO, Florida Museum of Natural History, that the Indonesian Institute of Sciences and Indonesian Ministry of Marine Affairs and Fisheries discovered the walking sharks.
Ornately patterned sharks used their fins to walk in very shallow water, said UQ's Dr Christine Dudgeon, to prey on reefs during low tides.
"At less than a metre long on average, walking sharks present no threat to people but their ability to withstand low oxygen environments and walk on their fins gives them a remarkable edge over their prey of small crustaceans and molluscs," Dr Dudgeon said.
"These unique features are not shared with their closest relatives the bamboo sharks or more distant relatives in the carpet shark order including wobbegongs and whale sharks.
The four new species almost doubled the total number of known walking sharks to nine.
Dr Dudgeon said they live in coastal waters around northern Australia and the island of New Guinea, and occupy their own separate region.
"We estimated the connection between the species based on comparisons between their mitochondrial DNA which is passed down through the maternal lineage. This DNA codes for the mitochondria which are the parts of cells that transform oxygen and nutrients from food into energy for cells," Dr Dudgeon said.
"Data suggests the new species evolved after the sharks moved away from their original population, became genetically isolated in new areas and developed into new species," she said.
"They may have moved by swimming or walking on their fins, but it's also possible they 'hitched' a ride on reefs moving westward across the top of New Guinea, about two million years ago.
"We believe there are more walking shark species still waiting to be discovered."
Dr Dudgeon said future research would help researchers to better understand why the region was home to some of the greatest marine biodiversity on the planet.
#Fisheries&Oceans; #MarineProtectedAreas; #Biodiversity; #Conservation; #ecosystem; #SustainableFisheries
Germany, Jan 15 (Canadian-Media): Marine protected areas reduce fish mortality by limiting harvesting and reducing habitat destruction. They are often designed and implemented to promote biodiversity conservation and sustainable fisheries, sciencedaily.com release reports said.
Fish species benefit from marine protection to varying extents. Image credit: phys.org
New research shows these conservation efforts lead not only to an increase in the total number of fishes (individuals) in general.
Protected areas in the northern Mediterranean Sea also harbour a higher number of common fish species, and significant positive network effects accumulate between individual reserves.
This was found by a team of researchers from multiple institutions including the German Centre of Integrative Biodiversity Research (iDiv), Tel Aviv University, Martin Luther University Halle-Wittenberg (MLU) and the Helmholtz Centre for Environmental Research (UFZ).
Their results have been published in the Journal of Applied Ecology and shed new light onto how fish communities respond to protection.
Coastal regions of the Mediterranean are home to more than one hundred million of people. For centuries, these regions have been impacted by multiple human stressors -- such as nutrient pollution and harvesting of natural resources.
Currently, 6.5% of the Mediterranean Sea is designated with some level of protection, though less than 1% is fully protected from all extractive uses, including fishing. Such protection is known to increase the number of individuals and fish biomass inside protected areas, but the effect on the number of species (species richness) is more variable, and evidence for biodiversity gains through protection is mixed. The international team of researchers examined how fish biodiversity in the Mediterranean responded to protection by comparing the numbers of individuals, the relative abundance of species and how they are distributed in space, for fishes inside and outside of protected areas.
The researchers found that conservation has strong impacts on biodiversity. Most notable effects were found on the relative abundance of species in protected areas. Rare and common species were disproportionately affected by protection. In particular, there were more common species inside individual protected areas, as well as at the scale of all protected areas combined.
The researchers found that species most sensitive to exploitation responded more strongly to protection than species less sensitive to exploitation. Exploited species showed gains in the number of individuals inside protected areas, the number of common species, as well as of all species combined. Importantly, the increase in the number of common species with high sensitivity to exploitation was greater at regional than local scales. This reflects a tendency for different protected sites to have different exploited species. As a result, biodiversity benefits from a network of protected areas within an ecosystem.
"We found this network effect in reserves that were independently implemented, so they were not necessarily designed to combine as a network. It would be interesting to know whether similar patterns are found in networks of reserves designed with a particular focus, such as to maximize habitat diversity or promote connectivity among reserves," said first author Dr Shane Blowes from the German Centre for Integrative Biodiversity Research (iDiv) and Martin Luther University Halle-Wittenberg (MLU).
The research shows that examining multiple biodiversity components across scales gives new insights into how communities respond to protection. The findings of the team suggest that protection could help reverse taxonomic homogenisation that is possibly associated with harvesting, and that local biodiversity conservation initiatives can combine synergistically across a regional system of marine protected areas.
#OceanInnovation; #SDG14LifeBelowWater; #UNDP; #UN; #OceanInnovationChallenge
New York, Jan 11: The momentum on ocean protection and restoration has rapidly accelerated particularly since the 2017 Ocean Conference. However, a number of the SDG 14- Life Below Water targets still lag behind. Between overfishing, pollution, habitat loss and the multiple impacts of climate change on ocean ecosystems, the ocean has never faced such a diverse range of threats, UNDP reports said.
Image credit: www.oceanactionhub.org
UNDP launches a new call to action— Ocean Innovation Challenge (OIC) to accelerate progress on SDG 14 targets. The OIC seeks innovations that are transferable, replicable and scalable. The Challenge grants range from $50,000 to $250,000.
Recognizing the increasing urgency of tackling ocean pollution, particularly from plastics and nutrients, the first of several planned OICs focuses on SDG 14.1- Reduce Marine Pollution.
“At a time when the world’s oceans and seas face unprecedented pressures, UNDP’s new Ocean Innovation Challenge will shine a light on innovative, entrepreneurial and creative approaches that can advance ocean and coastal restoration and protection,” says Achim Steiner, UNDP Administrator.
“Supporting the blue economy in this way can help us achieve SDG 14— while spurring economic development and helping to reduce poverty and inequality.”
From fisheries to aquaculture to industrial agriculture, the 'business as usual' scenario will not deliver the kinds of transformational change needed to move towards truly sustainable ocean use.
“With four of SDG14’s ten targets maturing in 2020, we have a critical year ahead for the well-being of the Ocean. Thus the UN Ocean Conference, to be held 2-6 June 2020 in Lisbon, will have special importance in supporting the implementation of SDG14,” says Peter Thomson, UN Secretary General’s Special Envoy on Oceans.
“To achieve SDG14, we must break new ground with innovative technologies, policies, regulations and financial instruments. In this regard, the new UNDP Ocean Innovation Challenge is a most welcome addition to the growing number of ocean incubators and accelerators.”
For interested parties to take part in the Ocean Innovation Challenge:
The innovations to be submitted can include technological as well as cutting edge policy, regulatory, financial, economic or other actions that address either sea-based or land-based sectors.
Initial concepts can be submitted by public or private entities, including governments, private companies (including start-ups), NGO/CSO, United Nations entities, academic institutions, and intergovernmental organizations.
The Challenge must be implemented in and benefit stakeholders in developing countries, but may be submitted by developing or developed country proponents.
#Oceanography; #CollborativeConservativeApproach; #EndangeredReefFish
California (U.S.), Jan 7 (Canadian-Media): A new study from researchers at the Scripps Institution of Oceanography at the University of California San Diego has documented a successful recovery effort among Nassau Grouper populations in the Cayman Islands thanks to an approach involving government agencies, academic researchers, and nonprofit organizations, phys.org/news/2020 reports said.
A researcher swims in the midst of a Nassau Grouper aggregation as part of an ongoing effort to track the critically endangered species numbers. Image Credit: Paul Humann, copyright Grouper Moon Project
The study, published January 6, 2020 in Proceedings of the National Academy of Sciences, used a two-pronged approach including tagging and video census data for monitoring and counting Nassau Grouper populations in an effort to more accurately estimate annual numbers of fish in the population and thus provide insight into the effects of ongoing conservation efforts. While many governments have enacted regional or seasonal fishing closures in an attempt to allow recovery of overfished stocks of aggregating reef fishes, this is one of the first studies to provide evidence that these measures can be successful.
"Normally, Nassau Grouper are relatively solitary, and tend to be hard to catch," said Lynn Waterhouse, a former Ph.D. student in the Semmens Lab at Scripps Oceanography and research biologist at the John G. Shedd Aquarium in Chicago. "But at spawning, they come together en masse to form annual spawning aggregations, where historically tens of thousands of fish come together to reproduce, so they're very easy for fishermen to catch."
Due to overfishing during spawning, the species has suffered region-wide stock collapse. By the 1980s large aggregations had all but disappeared from the Caribbean region. Of the remaining aggregations, few contained more than 1,000 individuals and the species is currently listed as critically endangered by the International Union for Conservation of Nature.
In 2001, an aggregation of around 7,000 Nassau Grouper was discovered near Little Cayman, the smallest of the three islands located south of Cuba in the Caribbean Sea.
In 2003, the subsequent rapid overfishing of the aggregation drove the Cayman Islands Government to enact aggressive management policies by banning fishing at aggregation sites during the spawning season. Through the Grouper Moon Project, the Cayman Islands Department of Environment (CI-DOE) partnered with a citizen conservation group called Reef Environmental Education Foundation (REEF) and scientists from Scripps Oceanography and Oregon State University to develop a monitoring strategy for the remaining Cayman Island aggregations.
"We developed a unique approach for monitoring these populations over the course of nearly two decades," said senior author Brice Semmens, an associate professor and ecologist at Scripps Oceanography. "This included a combination of using mark and recapture tagging techniques to track the proportion of tagged fish and video transects to count fish across the aggregation."
The researchers faced a number of obstacles, including funding challenges and particularly difficult monitoring conditions—the Nassau Grouper has the unfortunate habit of aggregating at inconvenient and often dangerous locations along the reef shelf edge, making it difficult for divers to easily observe and tag the aggregation. But with the support of the CI-DOE, the team has been able to maintain their monitoring efforts for over 15 years.
Importantly, the researchers did not just track the number of fish in the aggregation—they worked together with the CI-DOE and local communities to share results and discuss next steps. After reviewing the data being collected by the Grouper Moon Project, in 2016 the government initiated an even more progressive fishing policy, banning all fishing of Nassau Grouper during the winter spawning season along with limits on the number and size of fish that can be kept.
As a result, the team was astonished at how quickly the Nassau Grouper population recovered—over the last 10 years the aggregation on Little Cayman had nearly tripled in size, going from around 1,200 fish in 2009 to over 7,000 in 2018. This growth was due, at least in part, to a rapid increase in the addition of new, younger fish to the aggregation.
"This really demonstrates the power of this collaborative approach to conservation," said co-author Christy Pattengill-Semmens, REEF's director of science. "We were able to monitor the population and provide information to support management as the data came in, allowing the Cayman government to respond rapidly with policy changes.
"These efforts have been successful because of the strength of the partnerships among the government, academic research groups, and nonprofits," she added. "CI-DOE also has a long history of working with fishing communities in the islands."
The team also emphasized that these results show that patience is key.
"Due to the way these fish breed and the timing and location of spawning events, it can take several generations before the right ocean conditions ultimately facilitate young grouper joining an aggregation," said Pattengill-Semmens. "This means that communities and governments may need to implement protection strategies over the course of years or even decades to meet their management targets."
"This is an ideal approach for conservation," said Semmens. "Just doing the science isn't enough. You need to partner with groups and governments capable of turning science into conservation decisions that support the local community."