Category: Review paper

Downfall of a Phylum? The negative effects of ocean acidification and ocean temperature rise on foraminifera populations

J. Sicheri \ Oceans First, Issue 2, 2015, pgs. 42-49.

Download PDF

Abstract:

Ocean acidification and rising ocean temperatures both pose threats to many marine organisms’ physiology and habitats. This paper will establish whether or not these factors have a negative impact on populations of foraminifera, an important type of zooplankton, and if so, to what severity? In addition, this paper promotes the need for more research into the effects of acidification and warming on marine life. While the predicted impacts in reviewed studies varied in severity, they all agreed that ocean acidification, and to a lesser extent ocean temperature rise, will negatively impact foraminifera. Most researchers also agreed that more research must be done to understand the full extent of the impacts of ocean acidification and ocean temperature rise on foraminifera. This paper concludes that the cumulative effect of climate change as a whole be more harmful to foraminifera than any individual factor. Research examining the combined impact of climate change factors such as ocean temperature rise and ocean acidification should be undertaken.

The Effects of SCUBA Diving on Coral Reefs

R. Marsman \ Oceans First, Issue 2, 2015, pgs. 33-41.

Download PDF

Abstract:

Coral reef habitats are in danger of destruction due to the carelessness of divers. Stony coral, the foundation from which coral reefs are built, have proven to be the most easily damaged by SCUBA divers in the Caribbean and Red seas. Through observation of the behaviour of divers around coral habitats over ten minute intervals, researchers were also able to determine that the dive frequency of an area and the level of experience of the SCUBA divers are extremely important factors influencing how much damage is being done to corals. Overall, it is the areas of high dive intensity and the diving groups with the least experience that cause the most damage to all coral types. Aside from improving education of divers, it is important to monitor them and lessen the frequency at which certain sites are being dived in order to preserve the fragile balance of diversity within these habitats.

Effects of climate change on ocean dead zones

I. Hurley \ Oceans First, Issue 2, 2015, pgs. 17-22.

Download PDF

Abstract: Over this century ocean dead zones are expected to dramatically increase in number. This paper reviews articles describing how climate change will impact ocean dead zones. These studies show that there are many aspects of climate change that affect dead zones. Primarily, an increase in temperature on dead zones, examined in depth in this review, will to lead to the expansion of dead zones through mechanisms such as stratification. Other aspects of climate change, such as changes in patterns of precipitation and changes in ocean circulation, will also affect ocean dead zones, though currently not enough research exists to say definitively how. Overall, the studies reviewed suggest that climate change will cause dead zones to spread globally.

The development of palaeotsunami research

S. Skripsky \ Oceans First, Issue 2, 2015, pgs. 10-16.

Download PDF

Abstract:

Over the last thirty years, the study of palaeotsunamis has received increasing attention. A palaeotsunami is a tsunami that happened in the distant past that there is no written record of. This paper will review the progress achieved and obstacles encountered in this field of palaeotsunamis. It will review how techniques, such as optical dating and radiocarbon dating, are used on coastal sediments to expand our understanding of palaeotsunamis. The main study sites discussed in this paper are located in New Zealand and British Columbia because these regions have different coastal deposits. By studying palaeotsunamis, researchers are able to better model and predict future tsunamis. Future ambition for this field of study is using palaeotsunami data to create a worldwide tsunami risk assessment, and being able to distinguish between sediments produced by palaeotsunamis or palaeostorms.

Narwhals and Climate Change: Effects of rising ocean temperatures on the Arctic population of narwhals

L. Henderson \ Oceans First, Issue 2, 2015, pgs. 1-9.

Download PDF

Abstract:

Climate change associated with increasing ocean temperatures is impacting the narwhal population of the Arctic Ocean, an area highly susceptible to rising temperatures. Among other things, these unique cetaceans are being affected by ice-entrapments and top-down controls from killer whale predation. Examining these factors can help predict the dangers to narwhal populations for future conservation efforts. Increasingly delayed ice formation due to global warming is causing high mortality of narwhals as they become entrapped in the rapidly freezing ice of the harsh winter. Warming ocean temperatures are opening up Arctic waters for killer whales to hunt narwhals as well, killing many more than they need for food in the process. The small population of narwhals is especially vulnerable to climate change. The narwhals are an important part of the Arctic food chain, being one of many secondary consumers, and increase its biodiversity with their distinctive protruding tusk, unique to the narwhal only. This review synthesizes the events causing increased mortality rates of narwhals to provide a scope for future conservation efforts.

The negative effects of blast fishing on coral reefs in Indonesia: Can they recover?

S. England \ Oceans First, Issue 1, 2014, pgs. 44-50.

Download PDF

Abstract:

Blast fishing, the destructive and illegal fishing method that involves using dynamite, is the cause of extensive damage to many coral reefs throughout Southeast Asia. Using explosives not only kills the vast majority of organisms within the blast radius, but also shatters coral skeletons leaving large rubble fields that prevent the recovery of damaged coral. Methods of rehabilitation have been implemented in order to determine how effective rehabilitation is in aiding the regrowth and recovery of damaged reefs near Indonesia. Economically friendly methods such as using rock piles, plastic mesh and cement slabs as treatments were examined and compared. The results of the studies showed that rock piles increased biodiversity and favoured the recovery of hard coral cover more than the other two treatment methods. Although rehabilitation is necessary for reef recovery, the elimination of blast fishing is equally as important to ensure healthy reefs and newly recovered reefs are not harmed.

 

A taxonomical comparison of riverine and lacustrine Lamprologus and shell dwelling Neolamprologus species, with consideration of morphological and phylogenetic classifications

D. Schenck \ Oceans First, Issue 1, 2014, pgs. 37-43.

Download PDF

Abstract:

Lamprologini is a tribe of cichlid fish that inhabit Southern Africa. The current taxonomy of the tribe has been called into question by recent phylogenetic studies. Specifically, the classification of Lamprologus, a genus which contains both lacustrine and riverine species, has been shown to be inadequate. In order to represent current research and a more realistic portrayal of evolutionary history the splitting of the current genus, separating the riverine species, is suggested. In addition, the inclusion of select shell dwelling Neolamprologus species into a group with lacustrine Lamprologus species is argued for. This is to better represent current molecular data.