scholarly journals Response of marine copepods to a changing tropical environment: winners, losers and implications

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e2052 ◽  
Author(s):  
Li Lee Chew ◽  
Ving Ching Chong
Keyword(s):  
Community Structure ◽  
Human Impacts ◽  
Fish Larvae ◽  
Anthropogenic Impacts ◽  
Anthropogenic Disturbances ◽  
Coastal Habitat ◽  
Copepod Community ◽  
Opportunistic Species ◽  
Time Periods ◽  
Sea Warming

Background.Climate change concurrent with anthropogenic disturbances can initiate serial changes that reverberate up the food chain with repercussions for fisheries. To date, there is no information available concerning the combined effects of global warming and human impacts on tropical marine food webs. While temperate copepods respond differently to warming and environmental stressors, the extent to which tropical copepods can adapt to rising temperature of already warm waters remains unknown. We hypothesize that sea warming and other anthropogenic disturbances over the long term will have the greatest impact on the copepod community in nearshore waters where their effects are accentuated, and therefore vulnerable and resilient species could be identified.Methods.Zooplankton samples were collected during two time periods (1985–86 and 2014–15) interposed by marked anthropogenic disturbances, and at the same five stations located progressively from inshore to offshore in Klang Strait, Malaysia, following the asymmetrical before-after-control-impact (BACI) design. Copepods were identified to species, and results were interpreted by univariate (ANOVA) and multivariate (PERMANOVA, PCO) analyses of the computed species abundance and diversity measures.Results.Copepod total abundance was not significantly different among stations but higher after disturbance than before disturbance. However, changes in the abundance of particular species and the community structure between time periods were dramatic. Coastal large-bodied calanoid species (e.g.,Acartia spinicauda,Calanopia thompsoni,Pseudodiaptomus bowmaniandTortanus forcipatus) were the most vulnerable group to disturbance. This however favored the opportunistic species (e.g.,Oithona simplex,O. attenuata,Hemicyclopssp.,Pseudomacrochironsp. andMicrosetella norvegica). Small-bodied copepods (e.g.,Paracalanussp.,Parvocalanus crassirostrisandEuterpina acutifrons) were unaffected.Centropages tenuiremiswas likely an introduced species. There was no significant loss in species richness of copepods despite the dramatic changes in community structure.Discussion.Sea warming and other human-induced effects such as eutrophication, acidification and coastal habitat degradation are likely the main factors that have altered copepod community structure. The large-bodied estuarine and coastal calanoid copepods are surmised to be vulnerable to eutrophication and hypoxia, while both resilient and opportunistic species are largely unaffected by, or adaptable to, degraded coastal environments and observed sea surface temperature (SST) rise. It is forecasted that SST rise with unmitigated anthropogenic impacts will further reduce large-bodied copepod species the favoured food for fish larvae with dire consequences for coastal fish production.

scholarly journals Novel approach to enhance coastal habitat and biotope mapping with drone aerial imagery analysis

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
João Gama Monteiro ◽  
Jesús L. Jiménez ◽  
Francesca Gizzi ◽  
Petr Přikryl ◽  
Jonathan S. Lefcheck ◽  
...  
Keyword(s):  
Anthropogenic Impacts ◽  
Spatial Scales ◽  
Low Cost ◽  
Human Populations ◽  
Coastal Habitat ◽  
Coastal Monitoring ◽  
Monitoring Programs ◽  
Novel Approach ◽  
Aerial Platforms ◽  
Rocky Habitats

AbstractUnderstanding the complex factors and mechanisms driving the functioning of coastal ecosystems is vital towards assessing how organisms, ecosystems, and ultimately human populations will cope with the ecological consequences of natural and anthropogenic impacts. Towards this goal, coastal monitoring programs and studies must deliver information on a range of variables and factors, from taxonomic/functional diversity and spatial distribution of habitats, to anthropogenic stress indicators such as land use, fisheries use, and pollution. Effective monitoring programs must therefore integrate observations from different sources and spatial scales to provide a comprehensive view to managers. Here we explore integrating aerial surveys from a low-cost Remotely Piloted Aircraft System (RPAS) with concurrent underwater surveys to deliver a novel approach to coastal monitoring. We: (i) map depth and substrate of shallow rocky habitats, and; (ii) classify the major biotopes associated with these environmental axes; and (iii) combine data from i and ii to assess the likely distribution of common sessile organismal assemblages over the survey area. Finally, we propose a general workflow that can be adapted to different needs and aerial platforms, which can be used as blueprints for further integration of remote-sensing with in situ surveys to produce spatially-explicit biotope maps.

scholarly journals The Past, Present, and Future of Tuna at Lake Moāwhitu: Drawing on the two knowledge baskets of Mātauranga Māori and Western Science

2021 ◽  
Author(s):  
Russleigh Parai
Keyword(s):  
Algal Blooms ◽  
Human Impacts ◽  
Anthropogenic Impacts ◽  
Land Use Changes ◽  
Environmental Dna ◽  
Western Science ◽  
Lake Water Quality ◽  
Dna Metabarcoding ◽  
Remedial Intervention ◽  
Life Force

<p><b>Knowledge generated through experience and understanding relies on the senses, one of which is listening. This thesis provides an opportunity to hear the diminishing voice of tuna utilizing paleolimnological techniques and our natural senses through traditional Indigenous methodologies in order to track the presence of tuna back in time. </b></p> <p>This study provides historical environmental context of Lake Moāwhitu catchment (Rangitoto ki te Tonga) as a once significant mahinga kai site for manawhenua, Ngāti Koata. The strong connection to place is not lost on Ngāti Koata despite for many their geographic detachment to their turangawaewae. They hear the voice of tuna calling them back to sustain them as they have sustained Māori from the beginning of time. Now considered wāhi tapu due to significant degradation, Moāwhitu is currently undergoing remedial intervention by Ngāti Koata, DoC, Lakes380 and stakeholders to restore the mauri (life force) of the Lake and adjacent wetland ecosystem.</p> <p>Drawing from two distinct knowledge streams of western science and mātauranga Māori, this study draws new (on-site) understandings about the anthropogenic impacts on tuna as well as their status and relationship as tuākana (older sibling) to Māori. Through this journey a ‘te ao Māori’ (Māori worldview) is explored, revealing a historically healthy and abundant tuna population and thriving tuākana-teina relationship up until recent decades. This information complements the environmental reconstruction derived from western science methods applied to a lake Moawhitu sediment core spanning the last 1000 years or so. Through a combination of palynology, hyperspectral scanning and bacterial environmental DNA metabarcoding, it is clear that lake water quality remained high despite various historical land cover and land use changes, until recent decades when deteriorating quality has accompanied a rise in cyanobacteria and toxic algal blooms. These changes appear to coincide with intensified pastoralism accompanying draining of the lake and fringing wetlands since the mid-twentieth century. How tuna have endured these recent human impacts and why their survival and sustainability is important to Aotearoa today is at the heart of this thesis which seeks to explore how two vastly different knowledge streams converge and navigate unchartered waters. The two knowledge baskets (with their respective world views) are held up for the reader to view and consider what an effective collaborative partnership looks like by recognising basic intrinsic values of respect, reciprocity and kindness. The challenge remains to draw out the very best of people (he tangata) as a way to bring about urgent regenerative solutions for our tuākana, tuna, and in turn humanity itself.</p>

Community structure of fish larvae in different biotopes of a neotropical river

2022 ◽  
Author(s):  
Merieli Melo-Silva ◽  
Jislaine Cristina da Silva ◽  
Andréa Bialetzki
Keyword(s):  
Community Structure ◽  
Fish Larvae

Influence of Kuroshio water on the annual copepod community structure in an estuary in the northwest Pacific Ocean

2016 ◽  
Vol 118 ◽  
pp. 165-176 ◽  
Author(s):  
Li-Chun Tseng ◽  
Shih-Hui Hsiao ◽  
Santosh Kumar Sarkar ◽  
Bhaskar Deb Bhattacharya ◽  
Qing-Chao Chen ◽  
...  
Keyword(s):  
Community Structure ◽  
Pacific Ocean ◽  
Northwest Pacific ◽  
Copepod Community ◽  
Northwest Pacific Ocean ◽  
Kuroshio Water ◽  
The Northwest Pacific Ocean

scholarly journals Heterogeneity and Anthropogenic Impacts on a Small Lowland Stream

Water ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 2002
Author(s):  
Somlyai ◽  
Berta ◽  
Nagy ◽  
Dévai ◽  
Ács ◽  
...  
Keyword(s):  
Agricultural Land ◽  
Human Impacts ◽  
Anthropogenic Impacts ◽  
Anthropogenic Effects ◽  
Nitrogen And Phosphorus ◽  
Buffer Zones ◽  
Small Surface ◽  
Great Heterogeneity ◽  
Physical And Chemical Variables ◽  
Physical And Chemical

During our work, we investigated the physical and chemical variables of a small surface watercourse to investigate how different anthropogenic effects affect its water quality. Along this small watercourse, there are well-separated areas that are affected by various anthropogenic effects. In addition to its origin and branches, in many places it is surrounded by agricultural land with insufficient buffer zones, which burdens the small watercourse with nitrogen and phosphorus forms. In the lower stages, artificial damming inhibits the natural flow of the Tócó Canal, thereby creating eutrophicated stagnant water areas. This is further strengthened by, in many cases, illegal communal and used water intake that further burdens the small watercourse. Considering the experience of our investigation, it can be stated that the examined small watercourse could barely suffer human impacts, and it could be described with great heterogeneity using physical and chemical variables. We experienced that this heterogeneity caused by anthropogenic effects appeared in all hydrologic states and seasons. Furthermore, our research showed that these small watercourses had such high heterogeneity that their monitoring and examination should be taken just as seriously as when it comes to larger watercourses.

Effects of the copepod community structure on fecal pellet flux in Kagoshima bay, a deep, semi-enclosed embayment

2010 ◽  
Vol 66 (5) ◽  
pp. 673-684 ◽  
Author(s):  
Toru Kobari ◽  
Hiroyasu Akamatsu ◽  
Masato Minowa ◽  
Toshihiro Ichikawa ◽  
Kazuo Iseki ◽  
...  
Keyword(s):  
Community Structure ◽  
Fecal Pellet ◽  
Copepod Community ◽  
Kagoshima Bay

A qualitative approach to evaluating the impact of human interventions on the middle Charente River (West France)

2020 ◽  
Author(s):  
Amélie Duquesne ◽  
Christine Plumejeaud-Perreau ◽  
Jean-Michel Carozza
Keyword(s):  
Human Impact ◽  
Human Impacts ◽  
Anthropogenic Impacts ◽  
River Management ◽  
Anthropogenic Pressure ◽  
Human Intervention ◽  
Impact Index ◽  
Human Interventions ◽  
The Impact ◽  
The City

&lt;p&gt;&lt;span&gt;Although many studies have analyzed the impact of human interventions on European rivers over decades or centuries, researchers have rarely evaluated the geomorphological effects of these anthropogenic pressures on fluvial systems. However, quantifying anthropogenic impacts is fundamental to understanding how rivers are affected by human interventions and to improving the river management and restoration. The aim of this study is to propose a new and original qualitative method to estimate the importance of human impacts on rivers over the last three centuries using the middle Charente River as a test case. The study area is an anastomosing, low-energy and little mobile river of the lowlands of Western France. It extends from the city of Angoul&amp;#234;me (Charente) to the city of Saintes (Charente-Maritime), with a length of approximately 100 km. The study segment has been subjected to high anthropogenic pressure since the High Middle Ages, and it was enhanced during the 19th century to facilitate navigation and terrestrial transportation, to ensure the exploitation of the water's driving force (water mills and paper mills), to maintain the local people (fishing dams and agro-pastoral uses) and to allow for flood protection. To understand and estimate the anthropogenic heritage of the Charente River, this study employed a two-stage method: 1) an inventory of the human interventions on the fluvial system through the consultation of geo-historical data (textual archives, historical maps and iconography) dating from the end of the 17th century to the 2010s and 2) an evaluation of the human impact of each human intervention, sub-category and category of intervention based on the calculation of the Cumulative Human Impact Index. The Cumulative Human Impact Index is composed of several qualitative attributes graded by an evaluator. The results allow one 1) to generate a database and typology of the human interventions affecting the middle Charente River over the long term; 2) to map the cumulative impacts of human interventions on the study area; and 3) to analyze the unitary and overall impact of each human intervention, sub-category and category of intervention on the river landscape's heritage. Finally, this study concludes with 1) a discussion of the advantages of using a qualitative methodology for the estimation of anthropogenic impacts and 2) a reflection on the use of the maps of cumulative human impacts for Charente River management and restoration.&lt;/span&gt;&lt;/p&gt;

Seasonal variations in the structure of copepod assemblages in tropical marine and estuarine waters, Coleroon, south-east India

2013 ◽  
Vol 94 (3) ◽  
pp. 521-535 ◽  
Author(s):  
M. Rajkumar ◽  
Jun Sun ◽  
I. R. Jenkinson ◽  
M.M. Rahman
Keyword(s):  
Community Structure ◽  
Species Diversity ◽  
Environmental Factors ◽  
Seasonal Patterns ◽  
Dissolved Oxygen Concentration ◽  
Copepod Community ◽  
Factors Affecting ◽  
Abundance And Diversity ◽  
High Diversity ◽  
Coleroon Estuary

A twelve-month investigation was undertaken on how copepod community structure varied in relation to environmental factors in the Coleroon estuary, south-east India. Sampling was monthly, from Station 1 in the sea to Station 4 in the Vettar backwaters. Canonical correspondence analysis (CCA) was applied to elucidate the environmental factors affecting the copepod community. A total of 104 copepod species in 38 genera and 26 families were recorded, with the Calanoids, Acartia erythraea and Oithona brevicornis being the most dominant. At all four stations, both these species loaded near the intercept of CCA axes 1 and 2, perhaps reflecting that they were autochthonous. Most species occurred in distinct seasonal patterns. Abundances ranged from 13 × 103 to 215 × 103 (ind. m−3). Coleroon waters showed high diversity (bits/ind.), from 5.29 at Station 3 to 4.97 at Station 4. Abundance correlated positively with temperature and salinity and negatively with rainfall, dissolved oxygen concentration (DO) and pH. Species diversity correlated strongly with abundance (P < 0.01). Abundance and diversity were highest during the summer, and both correlated positively with salinity. Temperatures (air and water), salinity, pH and DO varied in the ranges 26–36°C, 25–34.2°C, 9–38, 7.0–8.7 and 3.0–6.8 ml l-1, respectively. Nitrate, nitrite, phosphate and silicate (µM) varied in the ranges: 4.7–64.5, 0.4–14.1, 0.2–12.9 and 9.3–148, respectively.

Intra-seasonal variation of upwelling and its effects on copepod community structure off central/southern Chile (2002–2009)

Hydrobiologia ◽  
2015 ◽  
Vol 758 (1) ◽  
pp. 61-74 ◽  
Author(s):  
Carolina E. González ◽  
Ruben Escribano ◽  
Pamela Hidalgo
Keyword(s):  
Community Structure ◽  
Seasonal Variation ◽  
Southern Chile ◽  
Copepod Community
Sign in / Sign up

Export Citation Format

Share Document